https://doi.org/10.1140/epjc/s10052-021-08896-1
Regular Article - Experimental Physics
Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons
H1 Collaboration
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
3
Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium
4
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romania
5
STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK
6
Institute of Nuclear Physics Polish Academy of Sciences, 31342, Kraków, Poland
7
Institut für Physik, TU Dortmund, Dortmund, Germany
8
Joint Institute for Nuclear Research, Dubna, Russia
9
Irfu/SPP, CE Saclay, Gif-sur-Yvette, France
10
DESY, Hamburg, Germany
11
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
12
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
13
Department of Physics, University of Lancaster, Lancaster, UK
14
Department of Physics, University of Liverpool, Liverpool, UK
15
School of Physics and Astronomy, Queen Mary, University of London, London, UK
16
Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288, Marseille, France
17
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
18
Institute for Theoretical and Experimental Physics, Moscow, Russia
19
Lebedev Physical Institute, Moscow, Russia
20
Max-Planck-Institut für Physik, Munich, Germany
21
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
22
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
23
Faculty of Science, University of Montenegro, Podgorica, Montenegro
24
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
25
Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
26
Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Rome, Italy
27
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
28
Paul Scherrer Institut, Villigen, Switzerland
29
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
30
Yerevan Physics Institute, Yerevan, Armenia
31
DESY, Zeuthen, Germany
32
Institut für Teilchenphysik, ETH, Zurich, Switzerland
33
Physik-Institut der Universität Zürich, Zurich, Switzerland
34
Université Claude Bernard Lyon 1, CNRS/IN2P3, Villeurbanne, France
35
Now at Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia
36
Palackỳ University Olomouc, Olomouc, Czech Republic
37
Now at CERN, Geneva, Switzerland
38
Also at Ulaanbaatar University, Ulaanbaatar, Mongolia
39
Also at LAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, France
40
II. Physikalisches Institut, Universität Göttingen, Göttingen, Germany
41
Now at Institute for Information Transmission Problems RAS, Moscow, Russia
42
Brookhaven National Laboratory, Upton, New York, 11973, USA
43
Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave, 47907, West Lafayette, IN, USA
44
Department of Physics, Oxford University, Oxford, UK
45
Rice University, Houston, USA
46
Shandong University, Shandong, People’s Republic of China
47
Stony Brook University, 11794, Stony Brook, NY, USA
Received:
4
November
2020
Accepted:
20
January
2021
Published online:
3
March
2021
Charged particle multiplicity distributions in positron-proton deep inelastic scattering at a centre-of-mass energy GeV are measured. The data are collected with the H1 detector at HERA corresponding to an integrated luminosity of 136 pb
. Charged particle multiplicities are measured as a function of photon virtuality
, inelasticity y and pseudorapidity
in the laboratory and the hadronic centre-of-mass frames. Predictions from different Monte Carlo models are compared to the data. The first and second moments of the multiplicity distributions are determined and the KNO scaling behaviour is investigated. The multiplicity distributions as a function of
and the Bjorken variable
are converted to the hadron entropy
, and predictions from a quantum entanglement model are tested.
© The Author(s) 2021
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Funded by SCOAP3