Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at s=13TeV

ALICE Collaboration

doi:10.1016/j.physletb.2018.11.009

Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at s=13TeV

ALICE Collaboration

Sección de Física

Variable Energy Cyclotron Centre
University of California at Berkeley
Czech Academy of Sciences
Lund University
Panjab University
CERN
Polytechnic University of Turin
Indian Institute of Technology Bombay
Korea Institute of Science and Technology Information
Yale University
Alikhanov Institute for Theoretical and Experimental Physics
GSI Helmholtz Centre for Heavy Ion Research
Universidade Estadual de Campinas
Russian Research Centre Kurchatov Institute
National Institute for Nuclear Physics
Universidad Nacional Autónoma de México
COMSATS University Islamabad
Enrico Fermi Center
University of Bologna
NASU - Bogolyubov Institute for Theoretical Physics
University of Bergen
Goethe University Frankfurt
St. Petersburg State University
Central China Normal University
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Birmingham
University of Münster
Heidelberg University
Creighton University
Ruder Boskovic Institute
University of Houston
Lawrence Berkeley National Laboratory
Nantes Université
Technical University of Munich
Technische Universität München
University of Oslo
Aligarh Muslim University
Gangneung-Wonju National University
Inha University
University of Jammu
Université Paris-Saclay
University of Bonn
Homi Bhabha National Institute
University of Catania
Hungarian Academy of Sciences
STFC Daresbury Laboratory
Centre de calcul de l'IN2P3
Wayne State University
Joint Institute for Nuclear Research
University of Copenhagen
Utrecht University
Université de Strasbourg
Benemerita Universidad Autonoma de Puebla
Universidad Autonoma de Sinaloa
Moscow Engineering Physics Institute
RAS - Saint Petersburg Nuclear Physics Institute
University of Tennessee, Knoxville
Gauhati University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Faculty of Nuclear Sciences and Physical Engineering
Bose Institute
University of Texas at Austin
University of Pavia
Pavol Jozef Šafárik University
University of Brescia
University of Liverpool
Universidade de São Paulo
University of Helsinki
All-Russian Scientific Research Institute of Experimental Physics
Austrian Academy of Sciences
University of Tsukuba
National Research Foundation
Ohio State University
Technical University of Kosice
National Institute for Subatomic Physics
Pontificia Universidad Católica del Perú
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Jyväskylä
Universite Claude Bernard Lyon 1
Pusan National University
University of Cape Town
Slovak Academy of Sciences
Université Grenoble Alpes
Oak Ridge National Laboratory
University of Eastern Piedmont
Universidade Federal do ABC
Institute for Space Sciences
Indian Institute of Technology Indore
University of Cagliari
National Centre for Nuclear Research
University of Zagreb
Institute for High Energy Physics
RAS - Institute for Nuclear Research
National and Kapodistrian University of Athens
Chicago State University
Universidade Federal do Rio Grande do Sul
University of Split
Warsaw University of Technology
A. Alikhanian Yerevan Institute of Physics
The University of Tokyo
Nagasaki Institute of Applied Science
Western Norway University of Applied Sciences
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
Sejong University
Yonsei University
KTO Karatay University
Zentrum für Technologietransfer und Telekommunikation (ZTT)
Jeonbuk National University
California Polytechnic State University, San Luis Obispo
Suranaree University of Technology
University of South-Eastern Norway
China National Nuclear Corporation
University of the Witwatersrand
University of Foggia
University of Rome La Sapienza
Comenius University
RAS - Budker Institute of Nuclear Physics
University of Rajasthan
National Nuclear Research Center
University of Tübingen
Hiroshima University
Nara Women's University
Chinese Academy of Sciences
Indonesian Institute of Sciences

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35 Scopus citations

Abstract

The measurement of dielectron production is presented as a function of invariant mass and transverse momentum (p_T) at midrapidity (|y_e|<0.8) in proton–proton (pp) collisions at a centre-of-mass energy of s=13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at s=7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: dσ_cc¯/dy|_y=0=974±138(stat.)±140(syst.)±214(BR)μb and dσ_bb¯/dy|_y=0=79±14(stat.)±11(syst.)±5(BR)μb using PYTHIA simulations and dσ_cc¯/dy|_y=0=1417±184(stat.)±204(syst.)±312(BR)μb and dσ_bb¯/dy|_y=0=48±14(stat.)±7(syst.)±3(BR)μb for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various p_T intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of p_T. Upper limits for the contribution of virtual direct photons are extracted at 90% confidence level and found to be in agreement with pQCD calculations.

Original language	English
Pages (from-to)	505-518
Number of pages	14
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	788
DOIs	https://doi.org/10.1016/j.physletb.2018.11.009
State	Published - 10 Jan 2019

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10.1016/j.physletb.2018.11.009

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@article{f483a256dd5445d4bf4dd5736a17ec4f,

title = "Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at s=13TeV",

abstract = "The measurement of dielectron production is presented as a function of invariant mass and transverse momentum (pT) at midrapidity (|ye|<0.8) in proton–proton (pp) collisions at a centre-of-mass energy of s=13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at s=7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: dσcc¯/dy|y=0=974±138(stat.)±140(syst.)±214(BR)μb and dσbb¯/dy|y=0=79±14(stat.)±11(syst.)±5(BR)μb using PYTHIA simulations and dσcc¯/dy|y=0=1417±184(stat.)±204(syst.)±312(BR)μb and dσbb¯/dy|y=0=48±14(stat.)±7(syst.)±3(BR)μb for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various pT intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of pT. Upper limits for the contribution of virtual direct photons are extracted at 90\% confidence level and found to be in agreement with pQCD calculations.",

author = "\{ALICE Collaboration\} and S. Acharya and F. Torales-Acosta and D. Adamov{\'a} and J. Adolfsson and Aggarwal, \{M. M.\} and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and Ahn, \{S. U.\} and S. Aiola and A. Akindinov and M. Al-Turany and Alam, \{S. N.\} and Albuquerque, \{D. S.D.\} and D. Aleksandrov and B. Alessandro and \{Alfaro Molina\}, R. and Y. Ali and A. Alici and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and Anaam, \{M. N.\} and C. Andrei and D. Andreou and Andrews, \{H. A.\} and A. Andronic and M. Angeletti and V. Anguelov and C. Anson and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and R. Anwar and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arnold, \{O. W.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, \{M. D.\} and \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author",

year = "2019",

month = jan,

day = "10",

doi = "10.1016/j.physletb.2018.11.009",

language = "English",

volume = "788",

pages = "505--518",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

}

TY - JOUR

T1 - Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at s=13TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Torales-Acosta, F.

AU - Adamová, D.

AU - Adolfsson, J.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfaro Molina, R.

AU - Ali, Y.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, D.

AU - Andrews, H. A.

AU - Andronic, A.

AU - Angeletti, M.

AU - Anguelov, V.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Anwar, R.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arnold, O. W.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2019/1/10

Y1 - 2019/1/10

N2 - The measurement of dielectron production is presented as a function of invariant mass and transverse momentum (pT) at midrapidity (|ye|<0.8) in proton–proton (pp) collisions at a centre-of-mass energy of s=13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at s=7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: dσcc¯/dy|y=0=974±138(stat.)±140(syst.)±214(BR)μb and dσbb¯/dy|y=0=79±14(stat.)±11(syst.)±5(BR)μb using PYTHIA simulations and dσcc¯/dy|y=0=1417±184(stat.)±204(syst.)±312(BR)μb and dσbb¯/dy|y=0=48±14(stat.)±7(syst.)±3(BR)μb for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various pT intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of pT. Upper limits for the contribution of virtual direct photons are extracted at 90% confidence level and found to be in agreement with pQCD calculations.

AB - The measurement of dielectron production is presented as a function of invariant mass and transverse momentum (pT) at midrapidity (|ye|<0.8) in proton–proton (pp) collisions at a centre-of-mass energy of s=13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at s=7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: dσcc¯/dy|y=0=974±138(stat.)±140(syst.)±214(BR)μb and dσbb¯/dy|y=0=79±14(stat.)±11(syst.)±5(BR)μb using PYTHIA simulations and dσcc¯/dy|y=0=1417±184(stat.)±204(syst.)±312(BR)μb and dσbb¯/dy|y=0=48±14(stat.)±7(syst.)±3(BR)μb for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various pT intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of pT. Upper limits for the contribution of virtual direct photons are extracted at 90% confidence level and found to be in agreement with pQCD calculations.

UR - https://www.scopus.com/pages/publications/85057849439

U2 - 10.1016/j.physletb.2018.11.009

DO - 10.1016/j.physletb.2018.11.009

M3 - Article

AN - SCOPUS:85057849439

SN - 0370-2693

VL - 788

SP - 505

EP - 518

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at s=13TeV

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