Abstract
The spectra measurements of charged hadrons produced in the shower of a parton originating in the same hard scattering with a leptonically decaying Z boson are reported in lead-lead nuclei (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Both Pb-Pb and pp data sets are recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 1.7 nb-1 and 320 pb-1, respectively. Hadronic collision data with one reconstructed Z boson candidate with the transverse momentum pT>30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and pT spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.
Original language | English |
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Article number | 122301 |
Journal | Physical Review Letters |
Volume | 128 |
Issue number | 12 |
DOIs | |
Publication status | Published - 25 Mar 2022 |
Bibliographical note
Publisher Copyright:© 2022 CERN.
Funding
We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid and other centers for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies: BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); SEIDI, CPAN, PCTI, and FEDER (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).
Funders | Funder number |
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CPAN | |
ERC PUT | |
LNS | |
MESTD | |
MON | |
MSES | |
MSHE | |
MoER | |
PCTI | |
STAR | |
Swiss Funding Agencies | |
TUBITAK | |
UASLP-FAI | |
National Science Foundation | |
U.S. Department of Energy | |
Hispanics in Philanthropy | |
Maryland Ornithological Society | |
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) | |
Secretaría de Educación Pública | |
Türkiye Atom Enerjisi Kurumu | |
Horizon 2020 Framework Programme | 724704, 675440, 752730, 765710 |
Louisiana Academy of Sciences | |
Missouri University of Science and Technology | |
CERN | |
Thailand Center of Excellence in Physics | |
Cosmetic Surgery Foundation | |
Institute for the Promotion of Teaching Science and Technology | |
Science and Technology Facilities Council | |
Department of Science and Technology, Ministry of Science and Technology, India | |
Ministry of Education - Singapore | |
Department of Atomic Energy, Government of India | |
Science Foundation Ireland | |
Helmholtz-Gemeinschaft | |
Deutsche Forschungsgemeinschaft | |
Fundação de Amparo à Pesquisa do Estado de São Paulo | |
National Natural Science Foundation of China | |
National Science Council | |
Fundação para a Ciência e a Tecnologia | |
Russian Foundation for Basic Research | |
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior | |
Academy of Finland | |
Bundesministerium für Bildung und Forschung | |
Chinese Academy of Sciences | |
Austrian Science Fund | |
Fonds De La Recherche Scientifique - FNRS | |
Russian Academy of Sciences | |
Fonds Wetenschappelijk Onderzoek | |
Consejo Nacional de Ciencia y Tecnología | |
Ministerio de Economía y Competitividad | |
General Secretariat for Research and Technology | |
Ministry of Business, Innovation and Employment | |
Conselho Nacional de Desenvolvimento Científico e Tecnológico | |
Ministry of Science, ICT and Future Planning | |
National Research Foundation of Korea | |
Joint Institute for Nuclear Research | |
Instituto Nazionale di Fisica Nucleare | |
National Science and Technology Development Agency | Thailand |
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul | |
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación | |
Universiti Malaya | |
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro | |
Ministry of Science and Technology, Taiwan | |
National Academy of Sciences of Ukraine | |
Centre National de la Recherche Scientifique | |
Ministry of Education and Science | |
Institute for Research in Fundamental Sciences | |
Benemérita Universidad Autónoma de Puebla | |
Commissariat à l'Énergie Atomique et aux Énergies Alternatives | |
Secretaría de Estado de Investigación, Desarrollo e Innovación | |
European Regional Development Fund | |
State Atomic Energy Corporation ROSATOM | |
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional | |
Pakistan Atomic Energy Commission | |
Ministry of Science,Technology and Research | |
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie | |
Institut National de Physique Nucléaire et de Physique des Particules | |
Nemzeti Kutatási, Fejlesztési és Innovaciós Alap | |
National Research Center "Kurchatov Institute" |