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Publication . Other literature type . Article . Research . Preprint . 2021

Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies

Fruehwirth, Rudolf; Wulz, Claudia-Elisabeth; Melo Da Costa, Eliza; BRANDAO MALBOUISSON, Helena; Tomei, Thiago; De Moraes Gregores, Eduardo; De Souza Lemos, Dener; +282 Authors
Open Access

Measurements of the second Fourier harmonic coefficient (v2) of the azimuthal distributions of prompt and nonprompt D0 mesons produced in pp and pPb collisions are presented. Nonprompt D0 mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum (pT) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D0 meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty hadrons are extracted for the first time via nonprompt D0 mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D0 mesons is smaller than that for prompt D0 mesons. These new measurements indicate a positive charm hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.

Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); CERN; the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias.

CMS Collaboration: et al.

Funded by SCOAP3.

Peer reviewed

Subjects by Vocabulary

arXiv: Nuclear Experiment High Energy Physics::Experiment High Energy Physics::Phenomenology Nuclear Theory

Dewey Decimal Classification: ddc:530

Library of Congress Subject Headings: lcsh:Physics lcsh:QC1-999


Microsoft Academic Graph classification: Quark Meson Large Hadron Collider Hadron Elliptic flow Range (particle radiation) Physics Small systems Charm (quantum number) Particle physics


Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics, CMS, Ridge, Collectivity, Small systems, Heavy flavor, Elliptic flow, hep-ex, nucl-ex, 0105 Mathematical Physics, 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 530, 13000 GeV-cms, 8160 GeV-cms/nucleon, B: decay, CERN LHC Coll, D0: hadroproduction, charm, collective phenomena, correlation: long-range, decay: angular distribution, experimental results, heavy quark, lead, mass dependence, multiplicity: high, p nucleus: interaction, p p: scattering, transverse momentum dependence, 13000 GeV-cms, 8160 GeV-cms/nucleon, decay [B], CERN LHC Coll, CMS, hadroproduction [D0], charm, collective phenomena, long-range [correlation], angular distribution [decay], experimental results, heavy quark, lead, mass dependence, high [multiplicity], interaction [p nucleus], scattering [p p], transverse momentum dependence, Collectivity, Elliptic flow, Heavy flavor, Ridge, Small systems, Nuclear Physics - Experiment, Particle Physics - Experiment, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, PLUS AU COLLISIONS, HEAVY-FLAVOR, FLOW, ANISOTROPY, High Energy Physics - Experiment, Nuclear Experiment, CMS; Ridge; Collectivity; Small Systems; Heavy flavor; Elliptic flow, CMS; Collectivity; Elliptic flow; Heavy flavor; Ridge; Small systems, PARTICLE PHYSICS;LARGE HADRON COLLIDER;CMS, PARTICLE PHYSICS, LARGE HADRON COLLIDER, Physics, High Energy Physics - Experiment (hep-ex), Nuclear Experiment (nucl-ex), FOS: Physical sciences, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], CMS; Ridge; Collectivity; Small systems; Heavy flavor; Elliptic flow;, Settore FIS/01 - Fisica Sperimentale, Física, 530 Physics, 10192 Physics Institute, 3106 Nuclear and High Energy Physics, CMS ; Ridge ; Collectivity ; Small systems ; Heavy flavor ; Elliptic flow, Physique des particules élémentaires

Funded by
EC| AMVA4NewPhysics
Advanced Multi-Variate Analysis for New Physics Searches at the LHC
  • Funder: European Commission (EC)
  • Project Code: 675440
  • Funding stream: H2020 | MSCA-ITN-ETN
Direct and indirect searches for new physics in events with top quarks using LHC proton-proton collisions at the CMS detector
  • Funder: European Commission (EC)
  • Project Code: 752730
  • Funding stream: H2020 | MSCA-IF-EF-ST
International Training Network for Statistics in High Energy Physics and Society
  • Funder: European Commission (EC)
  • Project Code: 765710
  • Funding stream: H2020 | MSCA-ITN-ETN
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