Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV

CMS Collaboration

doi:10.1103/PhysRevLett.120.142302

Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV

CMS Collaboration

A. Alikhanian Yerevan Institute of Physics
Austrian Academy of Sciences
Université Paris-Saclay
Belarusian State University
University of Antwerp
Vrije Universiteit Brussel
Texas A&M University
Université libre de Bruxelles
Universidade Estadual de Campinas
Ghent University
Universidade Federal de Pelotas
Université catholique de Louvain
Universite de Mons
Centro Brasileiro de Pesquisas Físicas
Universidade do Estado do Rio de Janeiro
Alikhanov Institute for Theoretical and Experimental Physics
Universidade Estadual Paulista Júlio de Mesquita Filho
Universidade Federal do ABC
Bulgarian Academy of Sciences
Sofia University St. Kliment Ohridski
Beihang University
Joint Institute for Nuclear Research
CAS - Institute of High Energy Physics
Peking University
Universidad de los Andes Colombia
University of Split
Ruder Boskovic Institute
Helwan University
University of Cyprus
Charles University
Zewail City of Science and Technology
Universidad San Francisco de Quito
Academy of Scientific Research and Technology
Al-Fayoum University
The British University in Egypt
Ain Shams University
Université de Haute-Alsace
Lomonosov Moscow State University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
Lappeenranta-Lahti University of Technology
Université de Strasbourg
CERN
CNRS/IN2P3-Univ Mediterranee
Universite Claude Bernard Lyon 1
RWTH Aachen University
Georgian Technical University
Ivane Javakhishvili Tbilisi State University
University of Hamburg
German Electron Synchrotron
Brandenburg University of Technology
Eötvös Loránd University
Institute for Nuclear Research
Karlsruhe Institute of Technology
Demokritos National Centre for Scientific Research
National and Kapodistrian University of Athens
National Technical University of Athens
University of Ioannina
University of Debrecen
Wigner Research Centre for Physics
Institute of Physics Bhubaneswar
Visva-Bharati University
Indian Institute of Science Bangalore
National Institute of Science Education and Research
University of Ruhuna
Isfahan University of Technology
Panjab University
University of Delhi
Saha Institute of Nuclear Physics
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research
Yazd University
Islamic Azad University
Indian Institute of Science Education and Research Pune
Institute for Research for Fundamental Sciences
University of Siena
University of Milan - Bicocca
Purdue University
University College Dublin
National Institute for Nuclear Physics
University of Bari
Polytechnic University of Bari
University of Bologna
University of Catania
University of Florence
International Islamic University Malaysia
University of Genoa
Malaysian Nuclear Agency
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Consejo Nacional de Ciencia y Tecnologia Mexico
University of Rome La Sapienza
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University of Eastern Piedmont
University of Trieste
Kyungpook National University
Jeonbuk National University
Chonnam National University
Hanyang University
Korea University
Seoul National University
University of Seoul
Sungkyunkwan University
Vilnius University
University of Malaya
Warsaw University of Technology
RAS - Institute for Nuclear Research
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
Moscow Engineering Physics Institute
Universidad Iberoamericana (UIA)
Benemerita Universidad Autonoma de Puebla
Universidad Autonoma de San Luis Potosi
The University of Auckland
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University of Warsaw
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Laboratório de Instrumentação e Física Experimental de Partículas
University of Florida
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RAS - Budker Institute of Nuclear Physics
University of Belgrade
Moscow Institute of Physics and Technology
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Scuola Normale e Sezione dell'Infn
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CIEMAT
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Universidad de Cantabria
Riga Technical University
University of Zurich
Adiyaman University
TU Wien
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ETH Zurich—Institute for Particle Physics and Astrophysics (IPA)
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Izmir Institute of Technology
Necmettin Erbakan University
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Rutherford Appleton Laboratory
University of Southampton
Instituto de Astrofísica de Canarias
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NASU - Institute for Single Crystals
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University of Bristol
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Research output: Contribution to journal › Article › peer-review

123 Citations (Scopus)

Abstract

Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.

Original language	English
Article number	142302
Journal	Physical Review Letters
Volume	120
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.120.142302
Publication status	Published - 3 Apr 2018
Externally published	Yes

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10.1103/PhysRevLett.120.142302

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@article{46e6f83bd4164d67b3b644cdb39688cf,

title = "Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV",

abstract = "Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and J. Grossmann and J. Hrubec and M. Jeitler and A. K{\"o}nig and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and E. Pree and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and J. Wittmann and Wulz, \{C. E.\} and M. Zarucki and V. Chekhovsky and V. Mossolov and \{Suarez Gonzalez\}, J. and \{De Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and J. Lauwers and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Remortel\}, N. and \{Abu Zeid\}, S. and F. Blekman and J. D'Hondt and \{De Bruyn\}, I. and \{De Clercq\}, J. and O. Bouhali",

note = "Publisher Copyright: {\textcopyright} 2018 CERN.",

year = "2018",

month = apr,

day = "3",

doi = "10.1103/PhysRevLett.120.142302",

language = "English",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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T1 - Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Grossmann, J.

AU - Hrubec, J.

AU - Jeitler, M.

AU - König, A.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Pree, E.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Abu Zeid, S.

AU - Blekman, F.

AU - D'Hondt, J.

AU - De Bruyn, I.

AU - De Clercq, J.

AU - Bouhali, O.

PY - 2018/4/3

Y1 - 2018/4/3

N2 - Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.

AB - Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.

UR - https://www.scopus.com/pages/publications/85044988165

U2 - 10.1103/PhysRevLett.120.142302

DO - 10.1103/PhysRevLett.120.142302

M3 - Article

C2 - 29694107

AN - SCOPUS:85044988165

SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142302

ER -

Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV

Abstract

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