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Plots from Rivet analyses

Precise study of Z pT using novel technique (D0_2010_S8821313)

Spires | arXiv:1010.0262

Using 7.3 pb-1 the distribution of the variable $\phi^*$ is measured, which probes the same physical effects as the $Z/\gamma^*$ boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. Results are presented for both the di-electron and di-muon channel.

Measurement of differential $Z/\gamma^*$ pT (D0_2010_S8671338)

Spires | arXiv:1006.0618 [hep-ex]

Cross section as a function of pT of the Z boson decaying into muons in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of 0.97 fb$^{-1}$.

Z+jets angular distributions (D0_2009_S8349509)

Spires | arXiv:0907.4286 [hep-ex]

First measurements at a hadron collider of differential cross sections for $Z (\to \mu\mu)$+jet+X production in $\Delta\phi(Z, j)$, $|\Delta y(Z, j)|$ and $|y_\mathrm{boost}(Z, j)|$. Vector boson production in association with jets is an excellent probe of QCD and constitutes the main background to many small cross section processes, such as associated Higgs production. These measurements are crucial tests of the predictions of perturbative QCD and current event generators, which have varied success in describing the data. Using these measurements as inputs in tuning event generators will increase the experimental sensitivity to rare signals.

$Z/\gamma^*$ + jet + $X$ cross sections differential in pT(jet 1,2,3) (D0_2009_S8202443)

Spires | arXiv:0903.1748 [hep-ex]

Cross sections as a function of pT of the three leading jets in $Z/\gamma^{*} (\to e^{+} e^{-})$ + jet + X production in $p \bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV, based on an integrated luminosity of 1.0 fb$^{-1}$.

Measurement of differential $Z/\gamma^*$ + jet + $X$ cross sections (D0_2008_S7863608)

Spires | Phys.Lett. B669 (2008) 278-286 | doi:10.1016/j.physletb.2008.09.060 | arXiv:0808.1296 [hep-ex]

Cross sections as a function of pT and rapidity of the boson and pT and rapidity of the leading jet in the di-muon channel in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of 1.0 fb$^{-1}$.

Measurement of W charge asymmetry from D0 Run II (D0_2008_S7837160)

Spires | Phys.Rev.Lett.101:211801,2008 | doi:10.1103/PhysRevLett.101.211801 | arXiv:0807.3367v1 [hep-ex]

Measurement of the electron charge asymmetry in $p \bar p \to W + X \to e \nu_e + X$ events at a center of mass energy of 1.96 TeV. The asymmetry is measured as a function of the electron transverse momentum and pseudorapidity in the interval (-3.2, 3.2). This data is sensitive to proton parton distribution functions due to the valence asymmetry in the incoming quarks which produce the W. Initial state radiation should also affect the pT distribution.

$Z/\gamma^* + X$ cross-section shape, differential in $pT(Z)$ (D0_2008_S7554427)

Spires | arXiv:0712.0803

Cross sections as a function of pT of the vector boson inclusive and in forward region ($|y| > 2$, $pT<30$ GeV) in the di-electron channel in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of 0.98~fb$^{-1}$.

Measurement of the ratio sigma($Z/\gamma^*$ + $n$ jets)/sigma($Z/\gamma^*$) (D0_2008_S6879055)

Spires | hep-ex/0608052

Cross sections as a function of pT of the three leading jets and $n$-jet cross section ratios in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of $0.4~\text{fb}^{-1}$.

$Z/\gamma^* + X$ cross-section shape, differential in $y(Z)$ (D0_2007_S7075677)

Spires | Phys.Rev.D76:012003,2007 | arXiv:hep-ex/0702025

Cross sections as a function of di-electron rapidity $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, based on an integrated luminosity of $0.4~\text{fb}^{-1}$.

Tevatron Run I differential W/Z boson cross-section analysis (D0_2001_S4674421)

Spires | Phys.Lett.B517:299-308,2001 | doi:10.1016/S0370-2693(01)01020-6 | arXiv:hep-ex/0107012v2

Measurement of differential W/Z boson cross section and ratio in $p \bar{p}$ collisions at center-of-mass energy sqrt(s) = 1.8 TeV. The data cover electrons and neutrinos in a pseudo-rapidity range of -2.5 to 2.5.

Transverse momentum of the W boson (D0_2000_S4480767)

Spires | Phys.Lett. B513 (2001) 292-300 | doi:10.1016/S0370-2693(01)00628-1 | arXiv:hep-ex/0010026

Measurement of the differential cross section for W boson production as a function of its transverse momentum. The data were collected by the D0 experiment at the Fermilab Tevatron Collider during 1994-1995 and correspond to an integrated luminosity of 85 pb$^{-1}$.

CDF Run 2 underlying event in Drell-Yan (CDF_2010_S8591881_DY)

Spires | Phys.Rev.D82:034001,2010

Deepak Kar and Rick Field's measurement of the underlying event in Drell-Yan events. $Z -> ee$ and $Z -> \mu\mu$ events are selected using a $Z$ mass window cut between 70 and 110~GeV. ``Toward'', ``away'' and ``transverse'' regions are defined in the same way as in the original (2001) CDF underlying event analysis. The reconstructed $Z$ defines the $\phi$ direction of the toward region. The leptons are ignored after the $Z$ has been reconstructed. Thus the region most sensitive to the underlying event is the toward region (the recoil jet is boosted into the away region).

Z rapidity measurement (CDF_2009_S8383952)

Spires | arXiv:0908.3914 [hep-ex]

CDF measurement of the total cross section and rapidity distribution, $\mathrm{d}\sigma/\mathrm{d}y$, for $q\bar{q}\to \gamma^{*}/Z\to e^{+}e^{-}$ events in the $Z$ boson mass region ($66<M_{ee}<116$ GeV/c$^2$) produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV with 2.1 fb$^{-1}$ of integrated luminosity.

CDF Run II Z+b-jet cross section paper, 2 fb-1 (CDF_2008_S8095620)

Spires | arXiv:0812.4458

Measurement of the b-jet production cross section for events containing a $Z$ boson produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV, using data corresponding to an integrated luminosity of 2 fb$^{-1}$ collected by the CDF II detector at the Tevatron. $Z$ bosons are selected in the electron and muon decay modes. Jets are considered with transverse energy $E_T>20$ GeV and pseudorapidity $|\eta|<1.5$. The ratio of the integrated $Z$ + b-jet cross section to the inclusive $Z$ production cross section is measured differentially in jet $E_T$, jet $\eta$, $Z$-boson transverse momentum, number of jets, and number of b-jets. The first two measurements have an entry for each b-jet in the event, the last three measurements have one entry per event.

Jet pT and multiplicity distributions in W + jets events (CDF_2008_S7541902)

Spires | arXiv:0711.4044 [hep-ex] | Phys.Rev.D77:011108,2008

Measurement of the cross section for W boson production in association with jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV. The analysis uses 320 pb$^{-1}$ of data collected with the CDF II detector. W bosons are identified in their $e\nu$ decay channel and jets are reconstructed using an $R < 0.4$ cone algorithm. For each $W + \geq$ n-jet sample (where n = 1--4) a measurement of d$\sigma({p}\bar{p} \rightarrow W + \geq$ n jet)/d$E_T(n^{th}$-jet) $\times$ BR($W \rightarrow{e}\nu$) is made, where d$E_T(n^{th}$-jet) is the Et of the n$^{th}$-highest Et jet above 20 GeV. A measurement of the total cross section, $\sigma(p\bar{p} \rightarrow W + \geq$ $n$-jet) $\times$ BR($W \rightarrow{e}\nu)$ with $E_T(n^{th}-jet) > 25$ GeV is also made. Both measurements are made for jets with $|\eta| < 2$ and for a limited region of the $W \rightarrow{e}\nu$ decay phase space; $|\eta^{e}| < 1.1$, $p_{T}^{e} > 20$ GeV, $p_{T}^{\nu} > 30$ GeV and $M_{T} > 20$ GeV. The cross sections are corrected for all detector effects and can be directly compared to particle level $W$ + jet(s) predictions. These measurements can be used to test and tune QCD predictions for the number of jets in and kinematics of $W$ + jets events.

Measurement of differential Z/$\gamma^*$ + jet + X cross sections (CDF_2008_S7540469)

Spires | Phys.Rev.Lett.100:102001,2008 | arXiv:0711.3717 [hep-ex]

Cross sections as a function of jet transverse momentum in 1 and 2 jet events, and jet multiplicity in ppbar collisions at sqrt(s) = 1.96 TeV, based on an integrated luminosity of $1.7~\text{fb}^{-1}$. The measurements cover the rapidity region $|y_\text{jet}| < 2.1$ and the transverse momentum range $pT^\text{jet} > 30~\text{GeV}/c$.

CDF Run 2 underlying event in Drell-Yan (CDF_2008_NOTE_9351)

CDF public note 9351

Deepak Kar and Rick Field's measurement of the underlying event in Drell-Yan events. $Z -> ee$ and $Z -> \mu\mu$ events are selected using a $Z$ mass window cut between 70 and 110~GeV. ``Toward'', ``away'' and ``transverse'' regions are defined in the same way as in the original (2001) CDF underlying event analysis. The reconstructed $Z$ defines the $\phi$ direction of the toward region. The leptons are ignored after the $Z$ has been reconstructed. Thus the region most sensitive to the underlying event is the toward region (the recoil jet is boosted into the away region).

b-jet cross section in Z + jets events (CDF_2006_S6653332)

Spires | Phys.Rev.D.74:032008,2006 | doi:10.1103/PhysRevD.74.032008 | arXiv:hep-ex/0605099v2

Measurement of the $b$-jet cross section in events with $Z$ boson in $p\bar{p}$ collisions at center-of-mass energy sqrt(s) = 1.96 TeV. The data cover jet transverse momenta above 20 GeV and jet pseudorapidities in the range -1.5 to 1.5. $Z$ bosons are identified in their electron and muon decay modes in an invariant dilepton mass range between 66 and 116 GeV.

Z pT measurement in CDF Z -> $e^+e^-$ events (CDF_2000_S4155203)

Spires | Phys.Rev.Lett.84:845-850,2000 | arXiv:hep-ex/0001021 | doi:10.1103/PhysRevLett.84.845

Measurement of transverse momentum and total cross section of $e^+e^-$ pairs in the Z-boson region of $66~\text{GeV}/c^2 < m_{ee} < 116~\text{GeV}/c^2$ from pbar-p collisions at sqrt(s) = 1.8 TeV, with the Tevatron CDF detector. The Z pT, in a fully-factorised picture, is generated by the momentum balance against initial state radiation (ISR) and the primordial/intrinsic pT of the Z's parent partons in the incoming hadrons. The Z pT is important in generator tuning to fix the interplay of ISR and multi-parton interactions (MPI) ingenerating `underlying event' activity. This analysis is subject to ambiguities in the experimental Z pT definition, since the Rivet implementation reconstructs the Z momentum from the dilepton pair with finite cones for QED bremstrahlung summation, rather than non-portable direct use of the (sometimes absent) Z in the event record.


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