Measurement of electrons from beauty-hadron decays in p-Pb collisions at s N N = 5.02 √s_NN=5.02 TeV and Pb-Pb collisions at s N N = 2.76 √s_NN=2.76 TeV

2016/09/30 by J. Adam, ALICE Collaboration, D. Adamová +98
Physics and Astronomy · #Electron #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear matter #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Rapidity #Spectral line #hep-ex #nucl-ex

paper · pdf · doi:10.1007/jhep07(2017)052

published as JHEP 07 (2017) 052 · 35 pages, 7 captioned figures, 3 tables, authors from page 29, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3055

openalex created_date 2016/09/30 · openalex publication_date 2017/07/01 · arxiv created 2017/07/27 · arxiv updated 2017/08/02 · openalex updated_date 2026/08/06

Abstract

The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval 1 < p T < 8 GeV/c in minimum-bias p-Pb collisions at s NN = 5.02 TeV and in 1.3 < p T < 8 GeV/c in the 20% most central Pb-Pb collisions at s NN = 2.76 TeV. The pp reference spectra at s = 5.02 TeV and s = 2.76 TeV, needed for the calculation of the nuclear modification factors R pPb and R PbPb , were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at s = 7 TeV. In the p T interval 3 < p T < 8 GeV/c, a suppression of the yield of electrons from beauty-hadron decays is observed in Pb-Pb compared to pp collisions. Towards lower p T , the R PbPb values increase with large systematic uncertainties. The R pPb is consistent with unity within systematic uncertainties and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured R pPb and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of R PbPb below unity at high p T may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.

Citations

• Reference heavy flavour cross sections in pp collisions at sqrt(s) = 2.76 TeV, using a pQCD-driven sqrt(s)-scaling of ALICE measurements at sqrt(s) = 7 TeV
• Charm production and in-medium QCD energy loss in nucleus-nucleus collisions with ALICE. A performance study
• Measurement of theBs0Production Cross Section withBs0→J/ψϕDecays inppCollisions ats=7 TeV
• Heavy-quark probes of the quark-gluon plasma and interpretation of recent data taken at the BNL Relativistic Heavy Ion Collider
• Multiple collisions and induced gluon bremsstrahlung in QCD
• Heavy quark radiative energy loss in QCD matter
• Heavy Quark Energy Loss in a Nuclear Medium
• Event-by-event simulation of the three-dimensional hydrodynamic evolution from flux tube initial conditions in ultrarelativistic heavy ion collisions
• Two-pion Bose–Einstein correlations in central Pb–Pb collisions at sNN=2.76 TeV
• Light-cone wave function approach to open heavy flavor dynamics in QCD matter
• Gluon Radiation off Hard Quarks in a Nuclear Environment: Opacity Expansion
• Measurement of theJ/ψmeson andb-hadron production cross sections inpp¯collisions ats=1960 GeV
• Review of Multibody Charm Analyses
• Big-Bang Nucleosynthesis