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

S. Acharya; F. Torals-Acosta; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawl; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuguerque; D. Aleksandrov; B Alessandro; R. Alfaro Molina; Y. Ali; A. Alici; A. Alkin; J. Alme; T. Alt; L. Altenkamper; I. Altsybeev; MN Anaam; C. Andrei; Ian Bearden; Jens Jørgen Gaardhøje; Christian Alexander Bourjau; Marek Chojnacki; bsm989 bsm989; You Zhou; Børge Svane Nielsen; rtc312 rtc312; Vojtech Pacik; Katarina Gajdosova; Freja Thoresen; Vytautas Vislavicius; Alice Collaboration

doi:10.1016/j.physletb.2018.11.009

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

S. Acharya, F. Torals-Acosta, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawl, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuguerque, D. Aleksandrov, B Alessandro, R. Alfaro Molina, Y. Ali, A. AliciA. Alkin, J. Alme, T. Alt, L. Altenkamper, I. Altsybeev, MN Anaam, C. Andrei, Ian Bearden, Jens Jørgen Gaardhøje, Christian Alexander Bourjau, Marek Chojnacki, bsm989 bsm989, You Zhou, Børge Svane Nielsen, rtc312 rtc312, Vojtech Pacik, Katarina Gajdosova, Freja Thoresen, Vytautas Vislavicius, Alice Collaboration

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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.

Originalsprog	Engelsk
Tidsskrift	Physics Letters B
Vol/bind	788
Sider (fra-til)	505-518
Antal sider	14
ISSN	0370-2693
DOI	https://doi.org/10.1016/j.physletb.2018.11.009
Status	Udgivet - 10 jan. 2019

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10.1016/j.physletb.2018.11.009Licens: CC BY

1-s2.0-S0370269318308475-mainForlagets udgivne version, 970 KBLicens: CC BY

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Acharya, S., Torals-Acosta, F., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawl, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuguerque, DSD., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Ali, Y., ... Alice Collaboration (2019). Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV. Physics Letters B, 788, 505-518. https://doi.org/10.1016/j.physletb.2018.11.009

Acharya, S, Torals-Acosta, F, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawl, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuguerque, DSD, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Ali, Y, Alici, A, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Bearden, I , Gaardhøje, JJ, Bourjau, CA, Chojnacki, M, bsm989, B , Zhou, Y , Nielsen, BS , rtc312, R, Pacik, V, Gajdosova, K, Thoresen, F, Vislavicius, V & Alice Collaboration 2019, 'Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV', Physics Letters B, bind 788, s. 505-518. https://doi.org/10.1016/j.physletb.2018.11.009

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

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 = "S. Acharya and F. Torals-Acosta and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawl and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuguerque 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 MN Anaam and C. Andrei and Ian Bearden and Gaardh{\o}je, {Jens J{\o}rgen} and Bourjau, {Christian Alexander} and Marek Chojnacki and bsm989 bsm989 and You Zhou and Nielsen, {B{\o}rge Svane} and rtc312 rtc312 and Vojtech Pacik and Katarina Gajdosova and Freja Thoresen and Vytautas Vislavicius and {Alice Collaboration}",

year = "2019",

month = jan,

day = "10",

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

language = "English",

volume = "788",

pages = "505--518",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

publisher = "Elsevier",

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TY - JOUR

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

AU - Acharya, S.

AU - Torals-Acosta, F.

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawl, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuguerque, DSD

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, MN

AU - Andrei, C.

AU - Bearden, Ian

AU - Gaardhøje, Jens Jørgen

AU - Bourjau, Christian Alexander

AU - Chojnacki, Marek

AU - bsm989, bsm989

AU - Zhou, You

AU - Nielsen, Børge Svane

AU - rtc312, rtc312

AU - Pacik, Vojtech

AU - Gajdosova, Katarina

AU - Thoresen, Freja

AU - Vislavicius, Vytautas

AU - Alice Collaboration

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.

U2 - 10.1016/j.physletb.2018.11.009

DO - 10.1016/j.physletb.2018.11.009

M3 - Journal article

SN - 0370-2693

VL - 788

SP - 505

EP - 518

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

ER -

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

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