Springer : Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons

Andreev, V.; Lebedev, A.; Jung, A.W.; Vallée, C.; Eckerlin, G.; Gouzevitch, M.; Baghdasaryan, A.; Britzger, D.; Chekelian, V.; Martyn, H.U.; Žlebčík, R.; Janssen, X.; Laycock, P.; Henderson, R.C.W.; Egli, S.; Picuric, I.; Wünsch, E.; Park, S.; Baty, A.; Hreus, T.; Cantun Avila, K.B.; Huber, F.; Kapichine, M.; Cerny, K.; Contreras, J.G.; Lipka, K.; Spaskov, V.; Valkárová, A.; Petrukhin, A.; Sankey, D.P.C.; Truöl, P.; Favart, L.; Jung, H.; Li, W.; Katzy, J.; Rizvi, E.; Krüger, K.; Patel, G.D.; Polifka, R.; Jacquet, M.; Fleischer, M.; Grebenyuk, A.; Lobodzinski, B.; Landon, M.P.J.; Hoffmann, D.; Steder, M.; Daum, K.; Thompson, P.D.; Roosen, R.; Krücker, D.; Begzsuren, K.; Wegener, D.; Elsen, E.; Perez, E.; Tu, Z.; Gayler, J.; Kleinwort, C.; Ravdandorj, T.; Olsson, J.E.; Goerlich, L.; Feltesse, J.; Brandt, G.; Shushkevich, S.; Fomenko, A.; Pitzl, D.; Newman, P.R.; Dainton, J.B.; Mehta, A.; List, B.; Bolz, A.; Meyer, J.; Radescu, V.; Gal, C.; Levonian, S.; Mechelen, P.Van; List, J.; Ullrich, T.; Grindhammer, G.; Greenshaw, T.; Tseepeldorj, B.; Buniatyan, A.; Kostka, P.; Reimer, P.; Kretzschmar, J.; Chen, Z.; Soloviev, Y.; Zhang, Z.; Maxfield, S.J.; Diaconu, C.; Meyer, A.B.; Malinovski, E.; Schmitt, S.; Nowak, G.; Traynor, D.; Pascaud, C.; Ozerov, D.; Campbell, A.J.; Müller, K.; Boudry, V.; Morozov, A.; Raicevic, N.; Sauvan, E.; Žáček, J.; Schmookler, B.A.; Meyer, H.; Rostovtsev, A.; Belousov, A.; Straumann, U.; Hladkỳ, J.; Fedotov, A.; Schoeffel, L.; Sauter, M.; Gogitidze, N.; South, D.; Grab, C.; Bystritskaya, L.; Mikocki, S.; Naumann, Th.; Sykora, T.; Zhang, J.; Kogler, R.; Zomer, F.; Cvach, J.; Sopicki, P.; Zohrabyan, H.; Haidt, D.; Lange, W.; Deshpande, A.; Sefkow, F.; Horisberger, R.; Stella, B.; Rotaru, M.; Klein, M.; Mondal, M.M.; Niebuhr, C.; Schöning, A.; Specka, A.; Kiesling, C.; Robmann, P.

doi:10.1140/epjc/s10052-021-08896-1

Article
Report number	arXiv:2011.01812 ; DESY-20-176
Title	Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons
Author(s)	Andreev, V. (Lebedev Inst.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Baty, A. (Rice U.) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Bolz, A. (Heidelberg U.) ; Boudry, V. (Ecole Polytechnique) ; Brandt, G. (Gottingen U., II. Phys. Inst.) ; Britzger, D. (Munich, Max Planck Inst.) ; Buniatyan, A. (Birmingham U.) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Cerny, K. (Palacky U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Chen, Z. (Shandong U.) ; Contreras, J.G. (Merida, IPN) ; Cvach, J. (Prague, Inst. Phys.) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Deshpande, A. (SUNY, Stony Brook) ; Diaconu, C. (Marseille, CPPM) ; Eckerlin, G. (DESY) ; Egli, S. (PSI, Villigen) ; Elsen, E. (CERN) ; Favart, L. (Antwerp U. ; Brussels U., IIHE) ; Fedotov, A. (Moscow, ITEP) ; Feltesse, J. (IRFU, SPP, Saclay) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gal, C. (SUNY, Stony Brook) ; Gayler, J. (DESY) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (Lyon, IPN) ; Grab, C. (Zurich, ETH) ; Grebenyuk, A. (Antwerp U. ; Brussels U., IIHE) ; Greenshaw, T. (Liverpool U.) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Haidt, D. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Hladkỳ, J. (Prague, Inst. Phys.) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Antwerp U. ; Brussels U., IIHE) ; Huber, F. (Heidelberg U.) ; Jacquet, M. (Orsay, LAL) ; Janssen, X. (Antwerp U. ; Brussels U., IIHE) ; Jung, A.W. (Purdue U.) ; Jung, H. (DESY) ; Kapichine, M. (Dubna, JINR) ; Katzy, J. (DESY) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kogler, R. (Hamburg U.) ; Kostka, P. (Liverpool U.) ; Kretzschmar, J. (Liverpool U.) ; Krücker, D. (DESY) ; Krüger, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY, Zeuthen) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Levonian, S. (DESY) ; Lipka, K. (DESY) ; List, B. (DESY) ; List, J. (DESY) ; Li, W. (Rice U.) ; Lobodzinski, B. (Munich, Max Planck Inst.) ; Malinovski, E. (Lebedev Inst.) ; Martyn, H.U. (Aachen, Tech. Hochsch.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (Wuppertal U.) ; Meyer, J. (DESY) ; Mikocki, S. (Cracow, INP) ; Mondal, M.M. (SUNY, Stony Brook) ; Morozov, A. (Dubna, JINR) ; Müller, K. (Zurich U.) ; Naumann, Th. (DESY, Zeuthen) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nowak, G. (Cracow, INP) ; Olsson, J.E. (DESY) ; Ozerov, D. (PSI, Villigen) ; Park, S. (SUNY, Stony Brook) ; Pascaud, C. (Orsay, LAL) ; Patel, G.D. (Liverpool U.) ; Perez, E. (CERN) ; Petrukhin, A. (Lyon, IPN) ; Picuric, I. (Montenegro U.) ; Pitzl, D. (DESY) ; Polifka, R. (Charles U.) ; Radescu, V. (Oxford U.) ; Raicevic, N. (Montenegro U.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Prague, Inst. Phys.) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roosen, R. (Antwerp U. ; Brussels U., IIHE) ; Rostovtsev, A. (IITP, Moscow) ; Rotaru, M. (Bucharest, IFIN-HH) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Heidelberg U.) ; Sauvan, E. (Marseille, CPPM ; Annecy, LAPP) ; Schmitt, S. (DESY) ; Schmookler, B.A. (SUNY, Stony Brook) ; Schoeffel, L. (IRFU, SPP, Saclay) ; Schöning, A. (Heidelberg U.) ; Sefkow, F. (DESY) ; Shushkevich, S. (SINP, Moscow) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (DESY) ; Spaskov, V. (Dubna, JINR) ; Specka, A. (Ecole Polytechnique) ; Steder, M. (DESY) ; Stella, B. (INFN, Rome3 ; Rome III U.) ; Straumann, U. (Zurich U.) ; Sykora, T. (Charles U.) ; Thompson, P.D. (Birmingham U.) ; Traynor, D. (Queen Mary, U. of London) ; Truöl, P. (Zurich U.) ; Tseepeldorj, B. (Ulan Bator, Inst. Phys. Tech. ; Ulaanbaatar U.) ; Tu, Z. (Brookhaven) ; Ullrich, T. (Brookhaven) ; Valkárová, A. (Charles U.) ; Vallée, C. (Marseille, CPPM) ; Mechelen, P.Van (Antwerp U. ; Brussels U., IIHE) ; Wegener, D. (Dortmund U.) ; Wünsch, E. (DESY) ; Žáček, J. (Charles U.) ; Zhang, J. (SUNY, Stony Brook) ; Zhang, Z. (Orsay, LAL) ; Žlebčík, R. (DESY) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay, LAL)
Publication	2021-03-03
Imprint	2020-11-03
Number of pages	46
Note	57 Pages, 32 Tables, 12 Figures
In:	Eur. Phys. J. C 81 (2021) 212
DOI	10.1140/epjc/s10052-021-08896-1
Subject category	hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	DESY HERA H1
Abstract	Charged particle multiplicity distributions in positron-proton deep inelastic scattering at a centre-of-mass energy $\sqrt{s}=319$ GeV are measured. The data are collected with the H1 detector at HERA corresponding to an integrated luminosity of $136$ pb${}^{-1}$. Charged particle multiplicities are measured as a function of photon virtuality $Q^2$, inelasticity $y$ and pseudorapidity $\eta$ 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 $Q^2$ and the Bjorken variable $x_{\rm Bj}$ are converted to the hadron entropy $S_{\rm hadron}$, and predictions from a quantum entanglement model are tested.
Copyright/License	CC-BY-4.0 preprint: (License: arXiv nonexclusive-distrib 1.0)

$Mean multiplicity $\langle N \rangle$ as a function of $W$ measured at $\sqrt{s}=319$\gev~$ep$ collisions (left) and with an additional restriction to the current hemisphere $0<\eta^{\ast}<4$ (right). Further phase space restrictions are given in Table~\ref{tab:phasespace}. The corresponding $\langle y \rangle$ is indicated by the top axis for each measured $W$. Predictions from the RAPGAP model are shown by dashed lines. The total uncertainty is represented by the error bar.$ $Mean multiplicity $\langle N \rangle$ as a function of $W$ measured at $\sqrt{s}=319$\gev~$ep$ collisions (left) and with an additional restriction to the current hemisphere $0<\eta^{\ast}<4$ (right). Further phase space restrictions are given in Table~\ref{tab:phasespace}. The corresponding $\langle y \rangle$ is indicated by the top axis for each measured $W$. Predictions from the RAPGAP model are shown by dashed lines. The total uncertainty is represented by the error bar.$ $Second moment (variance) of the multiplicity distributions $Var(N)$ as a function of $W$ measured at $\sqrt{s}=319$\gev~$ep$ collisions (left) and with an additional restriction to the current hemisphere $0<\eta^{\ast}<4$ (right). Further phase space restrictions are given in Table~\ref{tab:phasespace}. The corresponding $\langle y \rangle$ is indicated by the top axis for each measured $W$. Predictions from the RAPGAP model are shown by dashed lines. The total uncertainty is represented by the error bar.$ Show more plots

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