Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

Abstract

The Lambda(b) differential production cross section and the cross section ratio anti-Lambda(b)/Lambda(b) are measured as functions of transverse momentum pt(Lambda(b)) and rapidity abs(y(Lambda(b))) in pp collisions at sqrt(s) = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/Psi Lambda, with the subsequent decays J/Psi to an opposite-sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.06 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively.

Submitted to Physics Letters B

References in corpus (30)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• The p_T Spectrum in Heavy-Flavour Hadroproduction
• Matching NLO QCD and parton showers in heavy flavour production
• Measurement of b hadron production fractions in 7 TeV pp collisions
• Strange Particle Production in pp Collisions at sqrt(s) = 0.9 and 7 TeV
• Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV
• CMS Tracking Performance Results from early LHC Operation
• Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region
• QCD analysis of first b cross section data at 1.96 TeV
• Heavy baryon/meson ratios in relativistic heavy ion collisions
• Finite-Mass Effects on Inclusive B-Meson Hadroproduction
• Measurement of the $B$ Meson Differential Cross Section, $d\sigma /d{p}_T$, in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeV
• Measurement of the B+ Production Cross Section in pp Collisions at sqrt(s) = 7 TeV
• Midrapidity antiproton-to-proton ratio in pp collisions at $\sqrt{s}=0.9$ and $7$ TeV measured by the ALICE experiment
• Measurement of the B0 production cross section in pp Collisions at sqrt(s) = 7 TeV
• Inclusive b-jet production in pp collisions at sqrt(s)=7 TeV
• Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Λ_{c} enhancement from strongly coupled quark-gluon plasma
• Measurement of the Strange B Meson Production Cross Section with J/Psi phi Decays in pp Collisions at sqrt(s) = 7 TeV
• Inclusive b-hadron production cross section with muons in pp collisions at sqrt(s) = 7 TeV
• ON THE COVARIANTIZATION OF THE CHIRAL CONSTRAINT
• Measurement of Ratios of Fragmentation Fractions for Bottom Hadrons in p-pbar Collisions at sqrt{s}=1.96 TeV
• Midrapidity Production of Secondaries in pp Collisions at RHIC and LHC Energies in the Quark-Gluon String Model
• Measurement of the cross section for production of b b-bar X, decaying to muons in pp collisions at sqrt(s)=7 TeV
• Particle Production in the Central Region at LHC Energies
• Heavy flavor nuclear modification factor: more baryons than mesons less energy loss

Cited by in corpus (54)

• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Open Heavy Flavor in QCD Matter and in Nuclear Collisions
• Study of the production of ${\Lambda }_b^0$ and ${\overline{B}}^0$ hadrons in $pp$ collisions and first measurement of the ${\Lambda }_b^0\to J/\psi p{K}^{-}$ branching fraction
• Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions
• ${\Lambda }_{\mathrm{c}}^{+}$ production in pp collisions at $\sqrt{s}=7$ TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Non-extensivity of hadronic systems
• ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production and baryon-to-meson ratios in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV at the LHC
• Study of the kinematic dependences of ${\Lambda }_b^0$ production in $pp$ collisions and a measurement of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ branching fraction
• Can Tsallis distribution fit all the particle spectra produced at RHIC and LHC?
• Measurement of electrons from semileptonic heavy-flavor hadron decays in pp collisions at $\sqrt{s}=2.76$ TeV
• Systematic analysis of hadron spectra in p+p collisions using Tsallis distribution
• Measurement of the flavour-specific CP-violating asymmetry $a_{\mathrm{sl}}^s$ in $B_s^0$ decays
• ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production in pp and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Forward production of ${\rm Y}$ mesons in $pp$ collisions at $\sqrt{s}=7$ and 8TeV
• Diffractive production of $\Lambda$ hyperons in the high-energy limit of strong interactions
• Measurement of the differential cross-section of B+ meson production in pp collisions at sqrt(s) = 7 TeV at ATLAS
• Measurement of the total and differential inclusive B+ hadron cross sections in pp collisions at sqrt(s) = 13 TeV
• Bottom-flavored inclusive emissions in the variable-flavor number scheme: A high-energy analysis
• High-energy emissions of light mesons plus heavy flavor at the LHC and the Forward Physics Facility
• Measurement of the cross sections of ${\Xi }_{\mathrm{c}}^0$ and ${\Xi }_{\mathrm{c}}^{+}$ baryons and branching-fraction ratio BR(${\Xi }_{\mathrm{c}}^0\to {\Xi }^{-}{\mathrm{e}}^{+}{\nu }_{\mathrm{e}}$)/BR(${\Xi }_{\mathrm{c}}^0\to {\Xi }^{-}{\pi }^{+}$) in pp collisions at 13 TeV
• Measurement of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons at midrapidity in pp collisions at $\sqrt{s}$ = 5.02 TeV
• First measurement of ${\Xi }_{\mathrm{c}}^0$ production in pp collisions at $\sqrt{\mathbf{s}}$ = 7 TeV
• b-Hadron production in the general-mass variable-flavour-number scheme and LHC data
• First measurement of ${\Lambda }_{\mathrm{c}}^{+}$ production down to $p_{\mathrm{T}}=0$ in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Inclusive lepton production from heavy-hadron decay in pp collisions at the LHC
• Observation of a ${\Lambda }_b^0-{\overline{\Lambda }}_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s}=7\text{ and }8\text{TeV}$
• High-energy QCD dynamics from bottom flavor fragmentation at the Hi-Lumi LHC
• Measurement of the branching ratio $\Gamma ({\Lambda }_b^0\to \psi (2S){\Lambda }^0)/\Gamma ({\Lambda }_b^0\to J/\psi {\Lambda }^0)$ with the ATLAS detector
• Exploring GeV-scale Majorana neutrinos in lepton-number-violating ${\Lambda }_b^0$ baryon decays
• Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at $\sqrt{s}=13$ TeV
• Exotic tetraquarks at the HL-LHC with JETHAD: A high-energy viewpoint
• Bottomoniumlike states in proton collisions: Fragmentation and resummation
• Bottom-Quark Forward-Backward and Charge Asymmetries at Hadron Colliders
• Inclusive charmed-meson production from bottom hadron decays at the LHC
• Lambda_c^+/Lambda_c^- and Lambda_b^0/\bar{Lambda}_b^0 production asymmetry at the LHC from heavy quark recombination
• Fragmentation of fully heavy tetraquarks: The TQ4Q1.1 functions as a case study
• ${\Lambda }_b^0$-baryon production in pp collisions in the general-mass variable-flavour-number scheme and comparison with CMS and LHCb data
• Unwinding the rare $\Omega$ sector: Fragmentation of fully charmed baryons from HL-LHC to FCC
• QCD equation of state with Tsallis statistics for heavy-ion collisions
• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Measuring polarization of light quarks at ATLAS and CMS
• Non-factorizable effects in top quark production
• Pseudoscalar heavy-quarkonium hadroproduction from nonrelativistic fragmentation at NLL/NLO${}^{+}$
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• Measurement of the forward-backward asymmetry in ${\Lambda }_b^0$ and ${\overline{\Lambda }}_b^0$ baryon production in $p\overline{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Comparing the Tsallis distribution with and without thermodynamical description in p+p collisions
• Asymmetry in ${\Lambda }_b$ and ${\bar{\Lambda }}_b$ production
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective
• CP Asymmetries in Many-Body Final States in Beauty & Charm Transitions
• Open heavy-flavour production from small to large collision systems with ALICE at the LHC
• Measurement of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Heavy Flavour Production at sqrt(s)=7 TeV