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Plots from Rivet analyses

Z+jets at 13 TeV (ATLAS_2015_CONF_2015_041_MU)

ATLAS-CONF-2015-041

Preliminary measurements of the cross section for the production of a $Z$ boson in association with jets in pp collisions at $\sqrt{s} = 13$\,TeV are presented, using data corresponding to an integrated luminosity of $85\,\text{pb}^{-1}$ collected by the ATLAS experiment at the Large Hadron Collider. The cross sections are measured for events containing a $Z$ boson decaying to electrons or muons and produced in association with up to four jets in the kinematical range of $p_\text{T} > 30$\,GeV and $|y| < 2.5$. NB--Use the plugin names ATLAS_2015_CONF_2015_041_EL or ATLAS_2015_CONF_2015_041_MU to specify the lepton channel.

Z+jets at 13 TeV (ATLAS_2015_CONF_2015_041_EL)

ATLAS-CONF-2015-041

Preliminary measurements of the cross section for the production of a $Z$ boson in association with jets in pp collisions at $\sqrt{s} = 13$\,TeV are presented, using data corresponding to an integrated luminosity of $85\,\text{pb}^{-1}$ collected by the ATLAS experiment at the Large Hadron Collider. The cross sections are measured for events containing a $Z$ boson decaying to electrons or muons and produced in association with up to four jets in the kinematical range of $p_\text{T} > 30$\,GeV and $|y| < 2.5$. NB--Use the plugin names ATLAS_2015_CONF_2015_041_EL or ATLAS_2015_CONF_2015_041_MU to specify the lepton channel.

W + jets (ATLAS_2014_I1319490)

Spires | Eur.Phys.J. C75 (2015) 82 | doi:10.1140/epjc/s10052-015-3262-7 | arXiv:1409.8639 [hep-ex]

Measurements of cross sections for the production of a $W$ boson in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. With an integrated luminosity of 4.6 $\text{fb}^{−1}$, this data set allows for an exploration of a large kinematic range, including jet production up to a transverse momentum of 1 TeV and multiplicities up to seven associated jets. The production cross sections for W bosons are measured in both the electron and muon decay channels. Differential cross sections for many observables are also presented including measurements of the jet observables such as the rapidities and the transverse momenta as well as measurements of event observables such as the scalar sums of the transverse momenta of the jets. The default routine will pick up the electron decay channel of the $W$ boson and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly.

W + jets (ATLAS_2014_I1319490_EL)

Spires | Eur.Phys.J. C75 (2015) 82 | doi:10.1140/epjc/s10052-015-3262-7 | arXiv:1409.8639 [hep-ex]

Measurements of cross sections for the production of a $W$ boson in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. With an integrated luminosity of 4.6 $\text{fb}^{−1}$, this data set allows for an exploration of a large kinematic range, including jet production up to a transverse momentum of 1 TeV and multiplicities up to seven associated jets. The production cross sections for W bosons are measured in both the electron and muon decay channels. Differential cross sections for many observables are also presented including measurements of the jet observables such as the rapidities and the transverse momenta as well as measurements of event observables such as the scalar sums of the transverse momenta of the jets. The default routine will pick up the electron decay channel of the $W$ boson and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly.

W + jets (ATLAS_2014_I1319490_MU)

Spires | Eur.Phys.J. C75 (2015) 82 | doi:10.1140/epjc/s10052-015-3262-7 | arXiv:1409.8639 [hep-ex]

Measurements of cross sections for the production of a $W$ boson in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. With an integrated luminosity of 4.6 $\text{fb}^{−1}$, this data set allows for an exploration of a large kinematic range, including jet production up to a transverse momentum of 1 TeV and multiplicities up to seven associated jets. The production cross sections for W bosons are measured in both the electron and muon decay channels. Differential cross sections for many observables are also presented including measurements of the jet observables such as the rapidities and the transverse momenta as well as measurements of event observables such as the scalar sums of the transverse momenta of the jets. The default routine will pick up the electron decay channel of the $W$ boson and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly.

Distributions sensitive to the underlying event in inclusive Z-boson production at 7 TeV (ATLAS_2014_I1315949)

Spires | Eur.Phys.J. C74 (2014) 3195 | doi:10.1140/epjc/s10052-014-3195-6 | arXiv:1409.3433 [hep-ex]

Charged-particle distributions sensitive to the properties of the underlying event are measured for an inclusive sample of events containing a $Z$-boson, decaying to an electron or muon pair. The measurement is based on data collected using the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of 4.6 $\text{fb}^{−1}$. Distributions of the charged particle multiplicity and of the charged particle transverse momentum are measured in regions of azimuthal angle defined with respect to the $Z$-boson direction.

Ratios of $V$+jets observables between $W$ and $Z$ events, electron channel (ATLAS_2014_I1312627_EL)

Spires | Eur.Phys.J. C74 (2014) 3168 | doi:10.1140/epjc/s10052-014-3168-9 | arXiv:1408.6510 [hep-ex]

Measurements of the ratio of the production cross sections for $W$ and $Z$ bosons in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6fb−1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum $p_\text{T} > 30$ GeV and jet rapidity $|y| < 4.4$. The default routine will pick up the electron decay channel of the heavy bosons and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly. NB #1: The "x01" Scatter2D objects are constructed from the ratio of "x02" to "x03" Histo1D objects. If several output yoda files are merged with yodamerge, the merged "x01" objects will become meaningless. New "x01" Scatter2Ds can easil be constructed in a postprocessing step from the merged "x02" (nominator) and "x03" (denominator) objects. NB #2: Special care ought to be taken when evaluating theoretical uncertainties due to potential cancellations/correlations between numerator and denominator.

Ratios of $V$+jets observables between $W$ and $Z$ events (ATLAS_2014_I1312627)

Spires | Eur.Phys.J. C74 (2014) 3168 | doi:10.1140/epjc/s10052-014-3168-9 | arXiv:1408.6510 [hep-ex]

Measurements of the ratio of the production cross sections for $W$ and $Z$ bosons in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6fb−1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum $p_\text{T} > 30$ GeV and jet rapidity $|y| < 4.4$. The default routine will pick up the electron decay channel of the heavy bosons and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly. NB #1: The "x01" Scatter2D objects are constructed from the ratio of "x02" to "x03" Histo1D objects. If several output yoda files are merged with yodamerge, the merged "x01" objects will become meaningless. New "x01" Scatter2Ds can easil be constructed in a postprocessing step from the merged "x02" (nominator) and "x03" (denominator) objects. NB #2: Special care ought to be taken when evaluating theoretical uncertainties due to potential cancellations/correlations between numerator and denominator.

Ratios of $V$+jets observables between $W$ and $Z$ events, muon channel (ATLAS_2014_I1312627_MU)

Spires | Eur.Phys.J. C74 (2014) 3168 | doi:10.1140/epjc/s10052-014-3168-9 | arXiv:1408.6510 [hep-ex]

Measurements of the ratio of the production cross sections for $W$ and $Z$ bosons in association with jets in proton–proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6fb−1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum $p_\text{T} > 30$ GeV and jet rapidity $|y| < 4.4$. The default routine will pick up the electron decay channel of the heavy bosons and compare it to the combined (muon and electron channel) data. Individual channels (for data) are available as well, use ATLAS_2014_I1312627_EL and ATLAS_2014_I1312627_MU to specify the decay channel directly. NB #1: The "x01" Scatter2D objects are constructed from the ratio of "x02" to "x03" Histo1D objects. If several output yoda files are merged with yodamerge, the merged "x01" objects will become meaningless. New "x01" Scatter2Ds can easil be constructed in a postprocessing step from the merged "x02" (nominator) and "x03" (denominator) objects. NB #2: Special care ought to be taken when evaluating theoretical uncertainties due to potential cancellations/correlations between numerator and denominator.

Measurement of Z boson in association with b-jets at 7 TeV in ATLAS (electron channel) (ATLAS_2014_I1306294)

Spires | arXiv:1407.3643 [hep-ex] | JHEP 1410 (2014) 141

Measurements of differential production cross-sections of a $Z$ boson in association with $b$-jets in $pp$ collisions at $\sqrt{s}=7$ TeV are reported. The data analysed correspond to an integrated luminosity of 4.6 fb$^{-1}$ recorded with the ATLAS detector at the Large Hadron Collider. Particle-level cross-sections are determined for events with a $Z$ boson decaying into an electron or muon pair, and containing $b$-jets. For events with at least one $b$-jet, the cross-section is presented as a function of the $Z$ boson transverse momentum and rapidity, together with the inclusive $b$-jet cross-section as a function of $b$-jet transverse momentum, rapidity and angular separations between the $b$-jet and the $Z$ boson. For events with at least two $b$-jets, the cross-section is determined as a function of the invariant mass and angular separation of the two highest transverse momentum $b$-jets, and as a function of the $Z$ boson transverse momentum and rapidity. Results are compared to leading-order and next-to-leading-order perturbative QCD calculations. This Rivet module implements the event selection for Z decaying into electrons. If you want to use muonic events, please refer to ATLAS\_2014\_I1306294\_MU

Measurement of $Z/\gamma^*$ boson $p_T$ at $\sqrt{s} = 7\text{TeV}$ (ATLAS_2014_I1300647)

Spires | JHEP09(2014)145 | arXiv:1406.3660 [hep-ex]

A measurement of the $Z/\gamma^*$ transverse momentum spectrum using ATLAS proton-proton collision data at a center of mass energy of $\sqrt{s} = 7{\text{TeV}}$ at the LHC. The measurement is performed in both $Z/\gamma^* \rightarrow ee$ and $Z/\gamma^* \rightarrow \mu \mu$ channels.

Measurement of the low-mass Drell-Yan differential cross section at 7 TeV (ATLAS_2014_I1288706)

Spires | JHEP06(2014)112 | doi:10.1007/JHEP06(2014)112 | arXiv:1404.1212 [hep-ex]

Measurements of the differential cross section for the process $Z/\gamma^\ast \rightarrow l$ $(l = e, \mu)$ as a function of dilepton invariant mass in pp collisions at $\sqrt{s} = 7$ TeV. The measurement is performed in the $e$ and $\mu$ channels for invariant masses between 26 GeV and 66 GeV in the fiducial region $p_\text{T}^\text{leading} > 15$ GeV, $p_\text{T}^\text{subleading} > 12$ GeV, $|\eta| < 2.4$ using an integrated luminosity of 1.6 $\text{fb}^{-1}$. The analysis is extended to invariant masses as low as 12 GeV in the muon channel within a fiducal region of $p_\text{T}^\text{leading} > 9$ GeV, $p_\text{T}^\text{subleading} > 6$ GeV, $|\eta| < 2.4$ with 35 $\text{pb}^{-1}$.

Measurements of electroweak production of dijets + $Z$ boson, and distributions sensitive to vector boson fusion (ATLAS_2014_I1279489)

Spires | JHEP 1404 (2014) 031 | arXiv:1401.7610 [hep-ex]

Measurements differential distributions for inclusive $Z$-boson-plus-dijet production are performed in five fiducial regions, each with different sensitivity to the electroweak contribution. Measured distributions include the differential cross section as a function of the dijet invariant mass, the differential cross section and a function of the dijet rapidity separation, the differential cross section as a function of the number of jets in the rapidity interval bounded by the two leading jets. Other measurements include the jet veto effiency as a function of the dijet invariant mass and rapdity separation, the normalized transverse momentum balance cut efficiency, and the average number of jets falling into the rapidity interval boundd by the two leading jets, as a function of dijet invariant mass and dijet rapidity separation.

$Z$ + jets in $pp$ at 7 TeV (ATLAS_2013_I1230812)

Spires | arXiv:1304.7098 [hep-ex] | J. High Energy Phys. 07 (2013) 032

Measurements of the production of jets of particles in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}$ = 7 TeV are presented, using data corresponding to an integrated luminosity of 4.6/fb collected by the ATLAS experiment at the Large Hadron Collider. Inclusive and differential jet cross sections in $Z$ events, with Z decaying into electron or muon pairs, are measured for jets with transverse momentum $p_T > 30$ GeV and rapidity $|y| < 4.4$. This Rivet module implements the event selection for the weighted combination of both decay channels and uses the data from that combination (as in the paper plots). But for simplification of its usage it only requires events with the electronic final state (muonic final state will be ignored). This allows to use it with either pure electronic samples, or mixed electron/muon events. If you want to use it with a pure muon sample, please refer to ATLAS\_2013\_I1230812\_MU.

W + b production at 7 TeV (ATLAS_2013_I1219109)

Spires | JHEP 1306 (2013) 084 | doi:10.1007/JHEP06(2013)084 | arXiv:1302.2929 [hep-ex]

Measurements of the W+b-jets ($W+b+X$ and $W+b\bar{b}+X$) production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. These results are based on data corresponding to an integrated luminosity of 4.6 $fb^{−1}$, collected with the ATLAS detector. Cross-sections are presented as a function of jet multiplicity and of the transverse momentum of the leading b-jet for both the combined muon and electron decay modes of the W boson. The default routine will consider the electron decay channel of the W boson. Use ATLAS_2013_I1217863_W_EL and ATLAS_2013_I1217863_W_MU to specify the decay channel directly.

kT splitting scales in W->lv events (ATLAS_2013_I1217867)

Spires | arXiv:1302.1415 [hep-ex]

Cluster splitting scales are measured in events containing W bosons decaying to electrons or muons. The measurement comprises the four hardest splitting scales in a kT cluster sequence of the hadronic activity accompanying the W boson, and ratios of these splitting scales.

W + DPI at 7 TeV (ATLAS_2013_I1216670)

Spires | New J.Phys. 15 (2013) 033038 | doi:10.1088/1367-2630/15/3/033038 | arXiv:1301.6872 [hep-ex]

The production of $W$ bosons in association with two jets in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36/pb, collected with the ATLAS detector at the LHC.

Measurement of the $W^+ W^-$ production cross-section at 7 TeV (ATLAS_2013_I1190187)

Spires | arXiv:1210.2979 [hep-ex]

Measurement of the fiducial cross section for $W^+ W^-$ production in proton proton collisions at a centre-of mass energy of 7 TeV, is presented, using data corresponding to an integrated luminosity of 4.6/fb collected by the ATLAS experiment at the Large Hadron Collider. The cross section is measured in the leptonic decay channels, using electron+MET and muon+MET $W$ decays. $W \to \tau$ processes with the tau decaying into electron + MET or muon + MET are also included in the measurement. The fiducial region contains dressed leptons in restricted $p_T$ and $\eta$ ranges. The selection has specific requirements for each production channel. A measurement of the normalized fiducial cross section as a function of the leading lepton transverse momentum is also presented.

Measurement of angular correlations in Drell-Yan lepton pairs to probe $Z/\gamma^*$ boson transverse momentum (ATLAS_2012_I1204784)

Spires | arXiv:1211.6899 [hep-ex]

A measurement of angular correlations in Drell-Yan lepton pairs via the $\phi^*$ observable is presented. This variable probes the same physics as the $Z/\gamma^*$ boson transverse momentum with a better experimental resolution. The $Z/\gamma^* \to ee$ and $Z/\gamma^* \to \mu \mu$ decays produced in proton--proton collisions at a centre-of-mass energy of $\sqrt{s} = 7\;\text{TeV}$ are used. Normalised differential cross sections as a function of $\phi^*$ are measured separately for electron and muon decay channels. The cross-section is also measured double differentially as a function of $\phi^*$ for three independent bins of the $Z$ boson rapidity.

Measurement of the $ZZ(*)$ production cross-section in $pp$ collisions at 7 TeV with ATLAS (ATLAS_2012_I1203852)

Spires | arXiv:1211.6096 [hep-ex]

Measurement of the fiducial cross section for $ZZ(*)$ production in proton proton collisions at a centre-of mass energy of 7 TeV, is presented, using data corresponding to an integrated luminosity of 4.6/fb collected by the ATLAS experiment at the Large Hadron Collider. The cross-section is measured using processes with two $Z$ bosons decaying to electrons or muons or with one $Z$ boson decaying to electrons or muons and a second $Z$ boson decaying to neutrinos. The fiducial region contains dressed leptons in restricted $p_T$ and $\eta$ ranges. The selection has specific requirements for both production processes. A measurement of the normalized fiducial cross-section as a function of $ZZ$ invariant mass, leading $Z$ $p_T$ and angle of two leptons coming from the leading $Z$ is also presented for both signal processes.

$W$+jets production at 7 TeV (ATLAS_2012_I1083318)

Spires | arXiv:1201.1276 [hep-ex]

Differential cross-sections of properties of the four leading jets in $W$+jets production, using the full 2010 dataset of 36 pb$^-1$. Observables include jet multiplicities, $pT$, $H_T$, angular distances, and others. All observables are available using jets with $pT>30$ and $pT>20$ GeV.

$WZ$ fiducial cross-section at 7 TeV in ATLAS (ATLAS_2011_I954993)

Spires | Phys.Lett. B709 (2012) 341-357 | arXiv:1111.5570

This is a measurement of $WZ$ production in 1.02 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = $7 TeV collected by the ATLAS experiment in 2011. Doubly leptonic decay events are selected with electrons, muons and missing transverse momentum in the final state. The measurement of the combined fiducial cross section for the $WZ$ bosons decaying directly into electrons and muons is performed.

$Z$+jets in $pp$ at 7 TeV (ATLAS_2011_I945498)

Spires | arXiv:1111.2690v1 [hep-ex] | CERN-PH-EP-2011-162

Production of jets in association with a $Z/\gamma^*$ boson in proton--proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector. The analysis includes the full 2010 data set, collected with a low rate of multiple proton--proton collisions in the accelerator, corresponding to an integrated luminosity of 36 pb$^{-1}$. Inclusive jet cross sections in $Z/\gamma^*$ events, with $Z/\gamma^*$ decaying into electron or muon pairs, are measured for jets with transverse momentum $p_T > 30$ GeV and jet rapidity $|y| < 4.4$.

W inclusive cross sections at 7 TeV (ATLAS_2011_I928289_W)

Spires

The production cross sections of the inclusive Drell-Yan process $W^\pm \rightarrow \ell\nu$ ($\ell = e, µ$) are measured in proton-proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector. The cross sections are evaluated differentially as a function of the $W$ boson rapidity based on an integrated luminosity of about 35 $\text{pb}^{−1}$ collected in 2010. The cross sections are measured separately for $W^+$ and $W^-$ production, and then used to construct the $W$ charge asymmetry as well.

Z inclusive cross sections at 7 TeV (ATLAS_2011_I928289_Z)

Spires

The production cross sections of the inclusive Drell-Yan process $Z/\gamma^\ast \rightarrow \ell\ell$ ($\ell = e, µ$) are measured in proton-proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector. The cross sections are evaluated differentially as a function of the $Z$ boson rapidity based on an integrated luminosity of about 35 $\text{pb}^{−1}$ collected in 2010.

Measurement of the W pT with electrons and muons at 7 TeV (ATLAS_2011_I925932)

Spires | arXiv:1108.6308v1 [hep-ex]

The W pT at $\sqrt{s} = 7$\;TeV is measured using $W\to e \, \nu_e$ and $W\to \mu \, \nu_\mu$ decay channels. The dressed leptons kinematics calculated from the sum of the post-FSR lepton momentum and the momenta of all photons radiated in a cone around the lepton, while the bare uses the lepton kinematics after all QED radiation.

Measurement of the Z pT with electrons and muons at 7 TeV (ATLAS_2011_S9131140)

Spires | arXiv:1107.2381 [hep-ex]

The Z pT at $\sqrt{s} = 7$\;TeV is measured using electron and muon $Z$ decay channels. The dressed leptons definition uses photons clustered in a cone around the charged leptons, while the bare lepton definition uses the post-FSR charged leptons only in the $Z$ reconstruction. The data used in the bare leptons calculation are based on a forward application of a PHOTOS-based energy loss correction and are hence not quite model-independent.

Muon charge asymmetry in W events at 7 TeV in ATLAS (ATLAS_2011_S9002537)

Spires | arXiv:1103.2929

Measurement of the muon charge asymmetry from W bosons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV with ATLAS. The asymmetry is measured in the $W \to \mu$ decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31 pb$^{-1}$.

$W$ + jets jet multiplicities and $p_\perp$ (ATLAS_2010_S8919674)

Spires | arXiv:1012.5382 [hep-ex]

Cross sections, in both the electron and muon decay modes of the W boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections for inclusive jet multiplicities. The results, based on an integrated luminosity of 1.3 pb-1, have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics.

Jet multiplicity and differential cross-sections of $Z$+jets events in $pp$ at $\sqrt{s} = 7$ TeV (CMS_2015_I1310737)

Spires | Phys.Rev. D91 (2015) 052008 | http://dx.doi.org/10.1103/PhysRevD.91.052008 | http://arxiv.org/abs/arXiv:1408.3104 | http://inspirehep.net/record/1310737

Measurements of differential cross sections are presented for the production of a Z boson and at least one hadronic jet in proton-proton collisions at $\sqrt{s}=7$ TeV, recorded by the CMS detector, using a data sample corresponding to an integrated luminosity of 4.9 $\text{fb}^{-1}$. The jet multiplicity distribution is measured for up to six jets. The differential cross sections are measured as a function of jet transverse momentum and pseudorapidity for the four highest transverse momentum jets. The distribution of the scalar sum of jet transverse momenta is also measured as a function of the jet multiplicity. The measurements are compared with theoretical predictions at leading and next-to-leading order in perturbative QCD. Cuts: First two leading electrons or muons with $p_T > 20$ GeV and $|\eta| < 2.4$ Dilepton invariant mass in the [71,111] GeV range Jets $p_T > 30$ GeV and $|\eta| < 2.4$ $\Delta{R}($lepton,jet$) > 0.5$

Differential cross-section of $W$ bosons + jets in $pp$ collisions at $\sqrt{s}=7$ TeV (CMS_2014_I1303894)

Spires | Phys. Lett. B741 (2014) 12-37 | https://inspirehep.net/record/1303894 | http://arxiv.org/abs/1406.7533

A study of jet production in association with $W$ bosons has been performed, in events with the $W$ decaying to a muon. Jets are required to have $pT > 30$ GeV and $|eta| < 2.4$. Muons are required to have $pT > 25$ and $|eta| < 2.1$. Jets are only considered if they are separated from the muon by $\Delta{R} > 0.5$. Muons are dressed with photons in a cone of $0.1$ around the muon.

Study of observables sensitive to double parton scattering in $W + 2$ jets process in $pp$ collisions at $\sqrt{s} = 7$ TeV (CMS_2013_I1272853)

Spires | CMS-FSQ-12-028 | CERN-PH-EP-2013-224 | arXiv:1312.5729 | Submitted to JHEP

Double parton scattering is investigated in proton-proton collisions at $\sqrt{s} = 7$ TeV where the final state includes a $W$ boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated luminosity of 5 inverse femtobarns, collected with the CMS detector at the LHC.

Rapidity distributions in exclusive $Z$ + jet and $\gamma$ + jet events in $pp$ collisions at $\sqrt{s} = 7$ TeV (CMS_2013_I1258128)

Spires | arXiv:1310.3082 | https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSMP12004 | Submitted to Phys. Rev. Lett

Rapidity distributions are presented for events containing either a $Z$ boson or a photon in association with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at $\sqrt{s} = 7$ TeV, correspond to an integrated luminosity of 5.0/fb. The individual rapidity distributions of the boson and the jet are consistent within 5\% with expectations from perturbative QCD. However, QCD predictions for the sum and the difference in rapidities of the two final-state objects show significant discrepancies with CMS data. In particular, next-to-leading-order QCD calculations, and two Monte Carlo event generators using different methods to merge matrix-element partons with evolved parton showers, appear inconsistent with the data as well as with each other.

Cross-section and angular correlations in $Z$ boson with $b$-hadrons events at $\sqrt{s} = 7$ TeV (CMS_2013_I1256943)

Spires | 10.1007 / JHEP12(2013)039 | arXiv:1310.1349 | CERN-PH-EP-2013-153 | CMS-EWK-11-015

A study of proton-proton collisions in which two $b$-hadrons are produced in association with a $Z$ boson is reported. The collisions were recorded at a centre-of-mass energy of 7 TeV with the CMS detector at the LHC, for an integrated luminosity of 5.2/fb. The $b$-hadrons are identified by means of displaced secondary vertices, without the use of reconstructed jets, permitting the study of $b$-hadron pair production at small angular separation. Differential cross sections are presented as a function of the angular separation of the $b$-hadrons and the $Z$ boson. In addition, inclusive measurements are presented. For both the inclusive and differential studies,different ranges of $Z$ boson momentum are considered.

CMS jet mass measurement in $W$ + jet events (CMS_2013_I1224539_WJET)

Spires | arXiv:1303.4811

Measurements of the mass spectra of the jets in dijet and $W/Z$+jet events from proton--proton collisions at a centre-of-mass energy of 7 TeV using a data sample of integrated luminosity of 5 fb$^-1$. The jets are reconstructed using the both the anti-$k_T$ algorithm with $R=0.7$ (AK7) and the Cambridge-Aachen algorithm with $R=0.8$ (CA8) and $R=1.2$ (CA12) with several grooming techniques applied (ungroomed, filtered, pruned and trimmed). See the text of the paper for more details. For the dijet events the distributions are presented as a function of the mean Mass of the two leading jets in bins of the mean p_\perp of the two jets.

CMS jet mass measurement in $Z$ + jet events (CMS_2013_I1224539_ZJET)

Spires | arXiv:1303.4811

Measurements of the mass spectra of the jets in dijet and $W/Z$+jet events from proton--proton collisions at a centre-of-mass energy of 7 TeV using a data sample of integrated luminosity of 5 fb$^-1$. The jets are reconstructed using the both the anti-$k_T$ algorithm with $R=0.7$ (AK7) and the Cambridge-Aachen algorithm with $R=0.8$ (CA8) and $R=1.2$ (CA12) with several grooming techniques applied (ungroomed, filtered, pruned and trimmed). See the text of the paper for more details. For the dijet events the distributions are presented as a function of the mean Mass of the two leading jets in bins of the mean p_\perp of the two jets.

Azimuthal correlations and event shapes in $Z$ + jets in $pp$ collisions at 7 TeV (CMS_2013_I1209721)

Spires | http://cms.cern.ch/iCMS/analysisadmin/cadi?ancode=EWK-11-021 | https://cds.cern.ch/record/1503578 | http://inspirehep.net/record/1209721 | arXiv:1301.1646 [hep-ex] (http://arxiv.org/abs/arXiv:1301.1646) | Submitted to Phys. Lett. B

Measurements are presented of event shapes and azimuthal correlations in the inclusive production of a Z boson in association with jets in proton-proton collisions. The data correspond to an integrated luminosity of 5.0/fb, collected with the CMS detector at the CERN LHC at $\sqrt{s} = 7$\;TeV. This to test perturbative QCD predictions and evaluate a substantial background to most physics channels. Studies performed as a function of jet multiplicity for inclusive $Z$ boson production and for $Z$ bosons with transverse-momenta greater than 150\;GeV, are compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The results are corrected for detector effects, and can therefore be used as input to improve models for describing these processes.

Forward-backward asymmetry A_FB in Drell-Yan lepton pairs at sqrt(s) = 7 TeV (CMS_2013_I1122847)

Spires | Phys. Lett. B 718 (2013) 752 | doi:10.1016/j.physletb.2012.10.082 | http://arxiv.org/abs/1207.3973

This analysis measures the forward-backward asymmetry $A_{FB}$ in Drell-Yan events at a center-of-mass energy of 7 TeV. Both the individual and combined electron and muon pair channels are analyzed. In four rapidity regions, $A_{FB}$ is given as a function of the lepton mass. The data, recorded with the CMS detector, corresponds to an integrated luminosity of $5\,\textrm{fb}^{-1}$.

Measurement of the underlying event activity in the Drell-Yan process at a centre-of-mass energy of 7 TeV (CMS_2012_I1107658)

Spires | CMS-QCD-11-012 | CERN-PH-EP-2012-085 | arXiv:1204.1411 [hep-ex]

A measurement of the underlying event activity using Drell-Yan events using muonic final state. The production of charged particles with pseudorapidity $|\eta| < 2$ and transverse momentum $p_\perp > 0.5\,\text{GeV}/c$ is studied in towards, transverse and away region w.r.t. to the direction of di-muon system. The UE activity is measured in terms of of a particle density and an energy density. The particle density is computed as the average number of primary charged particles per unit pseudorapidity and per unit azimuth. The energy density is expressed in terms of the average of the scalar sum of the transverse momenta of primary charged particles per unit pseudorapidity and azimuth. The ratio of the energy and particle density is also reported in 3 regions. UE activity is studied as a function of invariant mass of muon pair ($M_{\mu\mu}$) by limiting the ISR contribution by requiring transverse momentum of muon pair $p_\perp(\mu\mu) < 5\,\text{GeV}/c$. The $p_\perp(\mu\mu)$ dependence is studied for the events having $M_{\mu\mu}$ in window of 81--101 GeV/$c$. The normalized charged particle multiplicity and $p_\perp$ spectrum of the charged particles in three regions also been reported for events having $M_{\mu\mu}$ in window of 81--101 GeV/$c$. Multiplicity and $p_\perp$ spectra in the transverse region are also reported, for events having $p_\perp(\mu\mu) < 5\,\text{GeV}/c$.

Measurement of differential $Z/\gamma^*$ $p_T$ and y (CMS_2012_I941555)

Spires | Phys.Rev. D85 (2012) 032002 | arXiv:1110.4973 | CMS-EWK-10-010 | CERN-PH-EP-2011-169

Cross section as a function of $p_T$ and y of the Z boson decaying into muons in p p collisions at $\sqrt{s}$ = 7 TeV. $p_T$ and y cross sections are measured for $60 < m_{\mu\mu} < 120$ GeV. The $p_T$ cross section is measured for lepton $p_T > 20$ GeV and $\eta < 2.1$, while the y cross section is extrapolated to all lepton $p_T$ and $\eta$. This measurement was performed using 36 pb$^{-1}$ of data collected during 2010 with the CMS detector at the LHC.

Differential cross-sections of $\mathrm{Z}/\gamma^* \to e^{+}e^{-}$ vs rapidity and $\phi^*$ (LHCB_2012_I1208102)

Spires | J. High Energy Phys. 02 (2013) 106 | doi:10.1007/JHEP02(2013)106 | arXiv:1212.4620 [hep-ex]

Measurement of the $pp \to \mathrm{Z}^0$ cross-section in the $\mathrm{Z}/\gamma \to e^{+}e^{-}$ mode at $\sqrt{s} = 7$ TeV. Daughter electrons are required to have $p_T > 20$ GeV/$c$, $2 < \eta < 4.5$ and the dielectron invariant mass in range 60-120 GeV/$c^2$. The cross-section is given as a function of $Z$ rapidity and an angular variable ($\phi^*$) closely related to $Z$ transverse momentum (derived from the lepton pseudorapidity and azimuthal angle differences). For event generators implementing cross-section QCD corrections only at LO the distributions are normalized to the cross-section measured in data $76.0 \pm 0.8 \pm 2.0 \pm 2.6 \pm 0.4$ pb, where the first uncertainty is statistical, the second is systematic, the third is due to luminosity uncertainty and the fourth to FSR corrections.

Monte Carlo validation observables for $W[e \, \nu]$ + jets production (MC_WJETS)

Monte Carlo validation observables for $W[e \, \nu]$ + jets production

Monte Carlo validation observables for $W$ polarisation (MC_WPOL)

Observables sensitive to the polarisation of the W boson: A0, ... A7, fR, fL, f0, separately for W+ and W-.

Monte Carlo validation observables for $W^+[e^+ \, \nu]W^-[\mu^- \, \nu]$ + jets production (MC_WWJETS)

In addition to the typical jet observables this analysis contains observables related to properties of the WW-pair momentum, correlations between the WW, properties of the W bosons, properties of the leptons, correlations between the opposite charge leptons and correlations with jets.

Monte Carlo validation observables for $Z[e^+ \, e^-]$ production (MC_ZINC)

Monte Carlo validation observables for $Z[e^+ \, e^-]$ production

Monte Carlo validation observables for $Z[e^+ \, e^-]$ + jets production (MC_ZJETS)

Available observables are the pT of jets 1-4, jet multiplicity, $\Delta\eta(Z, \text{jet1})$, $\Delta R(\text{jet2}, \text{jet3})$, differential jet rates 0->1, 1->2, 2->3, 3->4, and integrated 0--4 jet rates.

Monte Carlo validation observables for $Z[e^+ \, e^-]Z[\mu^+ \, \mu^-]$ + jets production (MC_ZZJETS)

In addition to the typical jet observables this analysis contains observables related to properties of the ZZ-pair momentum, correlations between the ZZ, properties of the Z bosons, properties of the leptons, correlations between the opposite charge leptons and correlations with jets.


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