Spires | Phys.Lett.B703:267-273,2011 | arXiv:1107.3935 [hep-ex]
Measurement of the inclusive differential $\Phi$ cross-section in $pp$ collisions at $\sqrt {s}=7$TeV in the rapidity range of $ 2.44 < y < 4.06$ and the $p_\text{T}$ range of 0.6 GeV/c < $p_\text{T}$ < 5.0 GeV/c.
Spires | JHEP08:034,2011 | arXiv:1107.0882[hep-ex] | doi:10.1007/JHEP08(2011)034
This paper presents the production ratios for $\bar{\Lambda}/\Lambda$ and $\bar{\Lambda}/K_{s}^{0}$ measured by LHCb detector in 2010 at $\sqrt{s} = 0.9$ TeV and 7 TeV as functions of the transverse momentum $p_\perp$ and the rapidity $y$ in the ranges $0.15 < p_\perp < \unit{2.50}{GeV/c}$ and $2.0 < y < 4.5$, respectively. The results for the two energies are merged and represented as a function of rapidity loss $\Delta y = y_{\mathrm{beam}} - y$.
Spires | Phys.Lett.B693:69-80,2010 | arXiv:1008.3105[hep-ex]
The paper presents the cross-section and double differential cross-section measurement for prompt $K^0_S$ production in pp collisions at $\sqrt{s}$=0.9 TeV. The data were taken during the LHCb run in December 2009 and cover a transversal momentum range from 0 to 1.6 GeV/c. The differential production cross-section is calculated for three rapidity windows $2.5 < y < 3.0$, $3.0 < y < 3.5$ and $3.5 < y < 4.0$ as well as the whole rapidity domain $2.5 < y < 4.0$.
Spires | CMS-PAS-QCD-10-024 | https://cdsweb.cern.ch/record/1341853?ln=en
Pseudorapidity distributions of charged particles in $pp$ collisions at $\sqrt{s} = 0.9$ and 7~TeV with at least one central charged particle.
Spires | JHEP 1111 148 | doi:10.1007/JHEP11(2011)148 | arXiv:hep-ex/1110.0211
Forward energy flow measured by CMS at $\sqrt{s} = 0.9$ and 7~TeV in MB and dijet events.
Spires | J. High Energy Phys 09 (2011) 109
A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at Energies of 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| < 2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. Various comparisons are made between the two different energies and also beteen two sets of cuts on pT for leading track jet pT-leading > 3 GeV and pT-leading > 20 GeV. The activity is studied using 5 types of plots. 2 profile plots for the multiplcity of charged particles and the scalar sum of pT. and 3 distributions for the two previous quantities as well we pT for all the particles in the transverse region.
Spires | Phys. Lett. B 702 (2011) 336
A measurement of the ratio of the inclusive 3-jet to 2-jet cross sections as a function of the total jet transverse momentum, HT, in the range 0.2 < HT < 2.5 TeV is presented. The data have been collected at a proton-proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, and correspond to an integrated luminosity of 36/pb. Jets are anti-kt with $R=0.5$, $p_\perp>50$ GeV and $|\eta|<2.5$.
Spires | http://cdsweb.cern.ch/record/1355680
The inclusive jet cross section is measured in pp collisions with a center-of-mass energy of 7 TeV at the LHC using the CMS experiment. The data sample corresponds to an integrated luminosity of 34 inverse picobarns. The measurement is made for jet transverse momenta in the range 18-1100 GeV and for absolute values of rapidity less than 3. Jets are anti-kt with $R=0.5$, $p_\perp>18$ GeV and $|y|<3.0$.
Spires | JHEP 05 (2011) 064 | doi:10.1007/JHEP05(2011)064 | arXiv:1102.4282 [hep-ex]
The spectra of Kshort, Lambda, and Cascade- particles were measured versus transverse-momentum (pT) and rapidity(y) in proton-proton collisions at center-of-mass energies 900 and 7000 GeV. The production is normalized to all non-single-diffractive (NSD) events using corrections for trigger and selection efficiency, acceptance, and branching ratios. The results cover a rapidity range of |y|<2 and a pT range from 0 to 10 GeV (Kshort and Lambda) and 0 to 6 GeV (Cascade-). Antiparticles are included in all measurements so only the sum of Lambda and Lambdabar and Cascade- and anti-Cascade- are given. The rapidity distributions are shown versus |y| but normalized to a unit of y. Ratios of Lambda/Kshort and Cascade-/Lambda production versus pT and |y| are also given, with somewhat smaller systematic uncertainties than obtained from taking the ratio of the individual distributions.' The data were corrected according to the SD/DD/ND content of the CMS trigger, as predicted by pythia6. The uncertainties connected with correct or uncorrect modelling of diffraction were included in the systematic errors.
Spires | JHEP 1103 136 | doi:10.1007/JHEP03(2011)136 | arXiv:hep-ex/1102.3194
The differential $B\bar{B}$ cross-section is measured as a function of the opening angle $\Delta{R}$ and $\Delta\phi$ using data collected with the CMS detector during 2010 and corresponding to an integrated luminosity of 3.1 pb$^{-1}$. The measurement is performed for three different event energy scales, characterized by the transverse momentum of the leading jet in the event (above 56 GeV, above 84 GeV and above 120 GeV). Simulated events are normalised in the region $\Delta{R} > 2.4$ and $\Delta\phi > 3/4\pi$ respectively.
Spires | Phys.Rev.Lett.106:201804,2011 | doi:10.1103/PhysRevLett.106.201804 | arXiv:hep-ex/1102.2020
Measurement of dijet angular distributions in proton-proton collisions at a center-of-mass energy of 7 TeV. The data sample, collected with single jet triggers, has a total integrated luminosity of 36 pb-1, with jets being reconstructed using the anti-KT clustering algorithm using R=0.5. The data are presented for the variable CHI defined as EXP(|Y1-Y2|) where Y1 and Y2 are the rapidities of the two leading (highest PT) jets.'
Spires | Phys.Lett.B699:48-67,2011 | arXiv:1102.0068
Central transverse Thrust and Minor have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Input for the variables are anti-kt jets with $R=0.5$.
Spires | Phys. Rev. Lett. 106 (2011) 122003 | arXiv:1101.5029 [hep-ex]
Measurements of dijet azimuthal decorrelations in pp collisions at sqrt(s) = 7 TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9/pb. Jets are anti-kt with $R=0.5$, $p_\perp>80(30)$ GeV and $|\eta|<1.1$.
Spires | JHEP 1103,090 | doi:10.1007/JHEP03(2011)090 | arXiv:hep-ex/1101.3512
A measurement of the $b$-hadron production cross-section in proton-proton collisions at $\sqrt{s} = 7$~TeV. The dataset, corresponding to 85 inverse nanobarns, was recorded with the CMS experiment at the LHC using a low-threshold single-muon trigger. Events are selected by the presence of a muon with transverse momentum greater than 6 GeV with respect to the beam direction and pseudorapidity less than 2.1. The transverse momentum of the muon with respect to the closest jet discriminates events containing $b$ hadrons from background. The inclusive $b$-hadron production cross section is presented as a function of muon transverse momentum and pseudorapidity.
Spires | J. High Energy Phys. 01 (2011) 079 | doi:10.1007/JHEP01(2011)079 | arXiv:1011.5531 [hep-ex]
Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of sqrt(s) = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |eta|<0.5 to |eta|<2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution confirms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.
Spires | Phys.Rev.Lett.105:022002,2010 | doi:10.1103/PhysRevLett.105.022002 | arXiv:1005.3299 [hep-ex]
Charged particle spectra are measured in proton-proton collisions at center-of-mass energies 7000 GeV. The spectra are normalized to all non-single-diffractive (NSD) events using corrections for trigger and selection efficiency, acceptance, and branching ratios. There are transverse-momentum (pT) spectra from 0.1 to 2 GeV in bins of pseudorapidity (eta) and the pT spectrum from 0.1 to 6 GeV for |eta|<2.4. The eta spectra come from the average of three methods and cover |eta|<2.5 and are corrected to include all pT. The data were corrected according to the SD/DD/ND content of the CMS trigger, as predicted by pythia6. The uncertainties connected with correct or uncorrect modelling of diffraction were included in the systematic errors.
Spires | JHEP 02 (2010) 041 | doi:10.1007/JHEP02(2010)041 | arXiv:1002.0621 [hep-ex]
Charged particle spectra are measured in proton-proton collisions at center-of-mass energies 900 and 2360 GeV. The spectra are normalized to all non-single-diffractive (NSD) events using corrections for trigger and selection efficiency, acceptance, and branching ratios. There are transverse-momentum (pT) spectra from 0.1 to 2 GeV in bins of pseudorapidity (eta) and pT spectra from 0.1 to 4 GeV for |eta|<2.4. The eta spectra come from the average of three methods and cover |eta|<2.5 and are corrected to include all pT. The data were corrected according to the SD/DD/ND content of the CMS trigger, as predicted by pythia6. The uncertainties connected with correct or uncorrect modelling of diffraction were included in the systematic errors.
Spires | arXiv:1201.2808 [hep-ex]
Pseudorapidity gap distributions in proton-proton collisions at sqrt(s) = 7 TeV are studied using a minimum bias data sample with an integrated luminosity of 7.1 inverse microbarns. Cross sections are measured differentially in terms of Delta eta F, the larger of the pseudorapidity regions extending to the limits of the ATLAS sensitivity, at eta = +/- 4.9, in which no final state particles are produced above a transverse momentum threshold p_T Cut. The measurements span the region 0 < Delta eta F < 8 for 200 < p_T Cut < 800 MeV. At small Delta eta F, the data test the reliability of hadronisation models in describing rapidity and transverse momentum fluctuations in final state particle production. The measurements at larger gap sizes are dominated by contributions from the single diffractive dissociation process (pp -> Xp), enhanced by double dissociation (pp -> XY) where the invariant mass of the lighter of the two dissociation systems satisfies M_Y <~ 7 GeV. The resulting cross section is d sigma / d Delta eta F ~ 1 mb for Delta eta F >~ 3. The large rapidity gap data are used to constrain the value of the pomeron intercept appropriate to triple Regge models of soft diffraction. The cross section integrated over all gap sizes is compared with other LHC inelastic cross section measurements.
Spires | arXiv:1112.6297v2 [hep-ex] | CERN-PH-EP-2011-192
Inclusive jet and dijet cross sections have been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider. The cross sections were measured using jets clustered with the anti-kT algorithm with parameters R=0.4 and R=0.6. These measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 inverse picobarns. Inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. The measurements are performed in the jet rapidity range $|y|<4.4$, covering jet transverse momenta from 20 GeV to 1.5 TeV and dijet invariant masses from 70 GeV to 5 TeV. This is the successor analysis of ATLAS_2010_S8817804
Spires | arXiv:1112.4432
Measurement of $D^{*\pm}$ meson production in jets from proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV at the LHC. The measurement is based on a data sample recorded with the ATLAS detector with an integrated luminosity of $0.30\,\text{pb}^{-1}$ for jets with transverse momentum between 25 and 70 GeV in the pseudorapidity range $|eta| < 2.5$.
Spires | arXiv:1107.2092
Inclusive multi-jet production is studied using an integrated luminosity of 2.4 pb-1. Results on multi-jet cross sections are presented differential in pT of the four leading jets, HT. Additionally three-to-two jet fractions are presented differential in different observables. Jets are anti-kt with $R=0.4$ and $R=0.6$, $p_\perp>80(60)$ GeV and $|\eta|<2.8$.
Spires | arXiv:1107.1641 [hep-ex]
A measurement of the jet activity in rapidity intervals bounded by a dijet system. The fraction of events passing a veto requirement are shown as a function of both the rapidity interval size and the average transverse momentum of the dijet system. The average number of jets above the veto threshold are also shown as a function of the same variables. There are two possible selection criteria applied to data. Either the two highest transverse momentum jets or the jets most forward and backward in rapidity are taken to define the dijet system, where the veto threhsold is 20GeV. Additionally for the latter selection an alternative veto transverse momentum threshold which is equal to the average transverse momentum is applied. Jet selections are based on anti-kt with $R=0.6$, $p_\perp>20$ GeV and $|y|<4.4$.
Spires | arXiv:1103.1816
Underlying event measurements with the ATLAS detector at the LHC at center-of-mass energies of 900 GeV and 7 TeV, using calorimeter clusters rather than charged tracks.
Spires | arXiv:1102.2696
Dijet azimuthal decorrelation measured by ATLAS at 7 TeV. Jets are anti- kt with $R=0.6$, $p_\perp>100$ GeV, $|\eta|<0.8$. The analysis is binned in leading jet $p_\perp$ bins. All data is fully corrected.
Spires | arXiv:1101.0070
Measurement of jet shapes in inclusive jet production in pp collisions at 7 TeV based on 3pb$^-1$ of data. Jets are reconstructed in $|\eta| < 5$ using the anti-$k_\perp$ algorithm with $30 < pT < 600$ GeV and $|y| < 2.8$.
Spires | arXiv:1111.1297v2 [hep-ex] | Phys.Rev. D85 (2012) 012001
The production of Kshort and Lambda hadrons is studied in inelastic pp collisions at sqrt(s) = 0.9 and 7 TeV collected with the ATLAS detector at the LHC using a minimum-bias trigger. The observed distributions of transverse momentum, rapidity, and multiplicity are corrected to hadron level in a model-independent way within well defined phase-space regions. The distribution of the production ratio of Lambdabar to Lambda baryons is also measured. The results are compared with various Monte Carlo simulation models. Although most of these models agree with data to within 15% in the Kshort distributions, substantial disagreements with data are found in the Lambda distributions of transverse momentum.
Spires | CERN-PH-EP-2011-108 | arXiv:1109.0525 [hep-ex]
Measurement of inclusive electron and muon cross sections for $7 < \pT <26$~GeV in $|\eta| <2.0$, excluding $1.37<|\eta|<1.52$, and muon cross section for $4 < \pT < 100$~GeV in $|\eta| <2.50$. W/Z/gamma* component must be subtracted to leave the heavy flavour contribution.
Spires | Phys.Rev.D 84 (2011) 054001 | doi:10.1103/PhysRevD.84.054001 | arXiv:1107.3311 | ATLAS-STDM-2010-14 | CERN-PH-EP-2011-110
ATLAS measurement of track jet pT, multiplicity per jet, longitudinal fragmentation, transverse momentum, radius w.r.t jet axis distributions, with jets constructed from charged tracks with $pT > 300$ MeV, using the anti-$k_T$ jet algorithm with $R = 0.4, 0.6$.
Spires | arXiv:1012.5104
Measurements from proton-proton collisions at centre-of-mass energies of sqrt(s) = 0.9, 2.36, and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase-space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections.
Spires | arXiv:1012.0791
The underlying event measurements with the ATLAS detector at the LHC at the center of mass energies of 900 GeV and 7 TeV. The observables sensitive to the underlying event, i.e the charged particle density and charged pT sum, as well as their standard deviations and the average pT, are measured as functions of the leading track. A track pT cut of 500 MeV is applied for most observables, but the main profile plots are also shown for a lower track cut of 100 MeV, which includes much more of the soft cross-section. The angular distribution of the charged tracks with respect to the leading track is also studied, as are the correlation between mean transverse momentum and charged particle multiplicity, and the `plateau' height as a function of the leading track $|\eta|$.
Spires | arXiv:1009.5908
The first jet cross section measurement made with the ATLAS detector at the LHC. Anti-kt jets with $R=0.4$ and $R=0.6$ are resconstructed within $|y|<2.8$ and above 60~GeV for the inclusive jet cross section plots. For the di-jet plots the second jet must have pT>30~GeV. Jet pT and di-jet mass spectra are plotted in bins or rapidity $|y|<0.3$, $0.3<|y|<0.8$, $0.8<|y|<1.2$, $1.2<|y|<2.1$, $2.1<|y|<2.8$. Di-jet $\chi$ spectra are plotted in bins of di-jet mass $340~GeV<m_{12}<520~GeV$, $520~GeV<m_{12}<800~GeV$ and $800~GeV<m_{12}<1200~GeV$.
Spires | arXiv:1003.3124
The first measurements with the ATLAS detector at the LHC. Data were collected using a minimum-bias trigger in December 2009 during proton-proton collisions at a centre of mass energy of 900 GeV. The charged- particle density, its dependence on transverse momentum and pseudorapid- ity, and the relationship between transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range $|\eta| < 2.5$ and $p_\perp > 500$ MeV. All data is corrected to the particle level.
Spires | ATLAS-CONF-2010-049
Jets are identified and their properties studied using tracks measured by the ATLAS Inner Detector. Events are selected using a minimum-bias trigger, allowing the emergence of jets at low transverse momentum to be observed and for jets to be studied independently of the calorimeter. Jets are reconstructed using the anti-kt algorithm applied to tracks with two parameter choices, 0.4 and 0.6. An inclusive jet transverse momentum cross section measurement from 4 GeV to 80 GeV is shown, integrated over $|\eta| < 0.57$ and corrected to charged particle-level truth jets. The probability that a particular particle carries a fixed fraction of the jet momentum (fragmentation function) is also measured. All data is corrected to the particle level. ATTENTION - Data read from plots!
Spires | Eur.Phys.J.C71:1655,2011.
Obtaining the tranverse momentum spectra of pions, kaons and protons in $pp$ collisions at $\sqrt{s} = 0.9$ TeV with ALICE at the LHC. Mean transverse momentum as a function of the mass of the emitted particle is also included.
Spires | Eur.Phys.J.C71:1594,2011.
Tranverse momentum spectra of strange particles (K0s, Lambdas, Phis and Xis) in pp collisions at $sqrt(s) = 0.9 TeV$ with ALICE at the LHC. The ratio of cross sections as a function of pT for LAMBDA/K0S is also included.
Spires | Phys.Lett.B693:53-68,2010 | arXiv:1007.0719 [hep-ex]
ALICE measurement of $\langle p_\perp \rangle$ vs. $N_\text{ch}$ and invariant particle yield (as function of $p_\perp$) in proton-proton collisions at $\sqrt{s}=\unit{900}{\GeV}$.
Spires | Eur.Phys.J. C68 (2010) 345-354 | arXiv:1004.3514 [hep-ex]
This is an ALICE publication with pseudorapities for $\unit{0.9, 2.36 and 7}{\TeV}$ and the charged multiplicity at $\unit{7}{\TeV}$. The analysis requires at least on charged particle in the event. Only the INEL distributions are considered here
Spires | Eur.Phys.J.C68:89-108,2010 | arXiv:1004.3034 [hep-ex]
This is an ALICE analysis where charged particle multiplicities (including the zero bin) have been measured in three different pseudorapidity intervals ($|\eta|<0.5; |\eta|<1.0; |\eta|<1.3$. Only the INEL distributions have been considered here, i.e. this analysis can only be meaningfully compared to PYTHIA 6 with diffractive processes disabled. The data were taken at 900 and 2360 GeV.
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