Open Access

Multiplicities of positive and negative pions, kaons, and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target

G. D. Alexeev ²⁸, M. G. Alexeev ^20,19, C. Alice ^20,19, A. Amoroso ^20,19, V. Andrieux ³³, V. Anosov ²⁸, K. Augsten ⁴, W. Augustyniak²³, C. D. R. Azevedo ²⁶ et al. (COMPASS Collaboration)

C. D. R. Azevedo ²⁶, B. Badelek ²⁵, J. Barth ⁸, R. Beck⁸, J. Beckers ¹², Y. Bedfer ⁶, J. Bernhard ³⁰, M. Bodlak⁵, F. Bradamante ¹⁷, A. Bressan ^18,17, W.-C. Chang ³¹, C. Chatterjee ¹⁷, M. Chiosso ^20,19, S.-U. Chung^12,i,j, A. Cicuttin ^17,16, P. M. M. Correia ²⁶, M. L. Crespo ^17,16, D. D’Ago ^18,17, S. Dalla Torre ¹⁷, S. S. Dasgupta¹⁴, S. Dasgupta ^17,e, F. Delcarro ^20,19, I. Denisenko ²⁸, O. Yu. Denisov ¹⁹, S. V. Donskov ²⁹, N. Doshita ²², Ch. Dreisbach ¹², W. Dünnweber ^b, R. R. Dusaev ^1,29, D. Ecker ¹², D. Eremeev²⁹, P. Faccioli ²⁷, M. Faessler^b, M. Finger ^5,a, M. Finger, Jr.⁵, H. Fischer ¹⁰, K. J. Flöthner ⁸, W. Florian ^17,16, J. M. Friedrich ¹², V. Frolov ²⁸, L. G. Garcia Ordòñez ^17,16, O. P. Gavrichtchouk ²⁸, S. Gerassimov ^29,12, J. Giarra ¹¹, D. Giordano ^20,19, A. Grasso^20,19, A. Gridin ²⁸, M. Grosse Perdekamp ³³, B. Grube ¹², M. Grüner ⁸, A. Guskov ²⁸, P. Haas ¹², D. von Harrach¹¹, M. Hoffmann ⁸, N. d’Hose ⁶, C.-Y. Hsieh ³¹, S. Ishimoto ^22,h, A. Ivanov ²⁸, T. Iwata ²², V. Jary ⁴, R. Joosten ⁸, E. Kabuß ¹¹, F. Kaspar ¹², A. Kerbizi ^18,17, B. Ketzer ⁸, A. Khatun ⁶, G. V. Khaustov ²⁹, F. Klein⁹, J. H. Koivuniemi ^7,33, V. N. Kolosov ²⁹, K. Kondo Horikawa ²², I. Konorov ^29,12, A. Yu. Korzenev ²⁸, A. M. Kotzinian ^1,19, O. M. Kouznetsov ²⁸, A. Koval²³, Z. Kral ⁵, F. Kunne⁶, K. Kurek ²³, R. P. Kurjata ²⁴, K. Lavickova ⁴, S. Levorato ¹⁷, Y.-S. Lian ^31,l, J. Lichtenstadt ¹⁵, P.-J. Lin ³², R. Longo ³³, V. E. Lyubovitskij ^29,d, A. Maggiora ¹⁹, N. Makke ¹⁷, G. K. Mallot ^30,10, A. Maltsev ²⁸, A. Martin ^18,17, J. Marzec ²⁴, J. Matoušek ⁵, T. Matsuda ²¹, C. Menezes Pires ²⁷, F. Metzger ⁸, W. Meyer⁷, Yu. V. Mikhailov^29,a, M. Mikhasenko ^13,c, E. Mitrofanov²⁸, D. Miura ²², Y. Miyachi ²², R. Molina ^17,16, A. Moretti ^18,17, A. Nagaytsev ²⁸, D. Neyret ⁶, M. Niemiec ²⁵, J. Nový ⁴, W.-D. Nowak ¹¹, G. Nukazuka ²², A. G. Olshevsky ²⁸, M. Ostrick ¹¹, D. Panzieri ^19,f, B. Parsamyan ^1,19,30,*, S. Paul ¹², H. Pekeler ⁸, J.-C. Peng ³³, M. Pešek ⁵, D. V. Peshekhonov ²⁸, M. Pešková ⁵, S. Platchkov ⁶, J. Pochodzalla ¹¹, V. A. Polyakov ²⁹, C. Quintans ²⁷, G. Reicherz ⁷, C. Riedl ³³, D. I. Ryabchikov ^29,12, A. Rychter ²⁴, A. Rymbekova²⁸, V. D. Samoylenko ²⁹, A. Sandacz ²³, S. Sarkar ¹⁴, I. A. Savin ^28,a, G. Sbrizzai ¹⁷, H. Schmieden⁹, A. Selyunin ²⁸, L. Sinha¹⁴, D. Spülbeck ⁸, A. Srnka ², M. Stolarski ^27,†, M. Sulc ³, H. Suzuki ^22,g, S. Tessaro ¹⁷, F. Tessarotto ^17,‡, A. Thiel ⁸, F. Tosello ¹⁹, A. Townsend ^33,k, T. Triloki ¹⁷, V. Tskhay ²⁹, B. Valinoti ^17,16, B. M. Veit ¹¹, J. F. C. A. Veloso ²⁶, A. Vijayakumar ³³, M. Virius ⁴, M. Wagner ⁸, S. Wallner ¹², K. Zaremba ²⁴, M. Zavertyaev ²⁹, M. Zemko ^5,4, E. Zemlyanichkina ²⁸, and M. Ziembicki ²⁴ (COMPASS Collaboration)

¹A.I. Alikhanyan National Science Laboratory, 2 Alikhanyan Brothers Street, 0036, Yerevan, Armenia
²Institute of Scientific Instruments of the CAS, 61264 Brno, Czech Republic
³Technical University in Liberec, 46117 Liberec, Czech Republic
⁴Czech Technical University in Prague, 16636 Prague, Czech Republic
⁵Charles University, Faculty of Mathematics and Physics, 12116 Prague, Czech Republic
⁶IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
⁷Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany
⁸Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany
⁹Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany
¹⁰Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany
¹¹Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany
¹²Technische Universität München, Physik Department, 85748 Garching, Germany
¹³Ludwig-Maximilians-Universität, 80539 München, Germany
¹⁴Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India
¹⁵Tel Aviv University, School of Physics and Astronomy, 69978 Tel Aviv, Israel
¹⁶Abdus Salam ICTP, 34151 Trieste, Italy
¹⁷Trieste Section of INFN, 34127 Trieste, Italy
¹⁸University of Trieste, Department of Physics, 34127 Trieste, Italy
¹⁹Torino Section of INFN, 10125 Torino, Italy
²⁰University of Torino, Department of Physics, 10125 Torino, Italy
²¹University of Miyazaki, Miyazaki 889-2192, Japan
²²Yamagata University, Yamagata 992-8510, Japan
²³National Centre for Nuclear Research, 02-093 Warsaw, Poland
²⁴Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland
²⁵University of Warsaw, Faculty of Physics, 02-093 Warsaw, Poland
²⁶University of Aveiro, I3N, Department of Physics, 3810-193 Aveiro, Portugal
²⁷LIP, 1649-003 Lisbon, Portugal
²⁸Affiliated with an international laboratory covered by a cooperation agreement with CERN
²⁹Affiliated with an institute formerly covered by a cooperation agreement with CERN
³⁰CERN, 1211 Geneva 23, Switzerland
³¹Academia Sinica, Institute of Physics, Taipei 11529, Taiwan
³²Center for High Energy and High Field Physics and Department of Physics, National Central University, 300 Zhongda Road, Zhongli 320317, Taiwan
³³University of Illinois at Urbana-Champaign, Department of Physics, Urbana, Illinois 61801-3080, USA

^*Contact author: Bakur.Parsamyan@cern.ch
^†Contact author: Marcin.Stolarski@cern.ch
^‡Contact author: Fulvio.Tessarotto@cern.ch
^aDeceased.
^bRetired from Ludwig-Maximilians-Universität, 80539 München, Germany.
^cAlso at ORIGINS Excellence Cluster, 85748 Garching, Germany.
^dAlso at Institut für Theoretische Physik, Universität Tübingen, 72076 Tübingen, Germany.
^ePresent address: NISER, Centre for Medical and Radiation Physics, Bubaneswar, India.
^fAlso at University of Eastern Piedmont, 15100 Alessandria, Italy.
^gAlso at Chubu University, Kasugai, Aichi 487-8501, Japan.
^hAlso at KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
ⁱAlso at Department of Physics, Pusan National University, Busan 609-735, Republic of Korea.
^jAlso at Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
^kAlso at Fairmont State University, Department of Natural Sciences, 1201 Locust Avenue, Fairmont, West Virginia 26554, USA.
^lAlso at Department of Physics, National Kaohsiung Normal University, Kaohsiung County 824, Taiwan.

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Phys. Rev. D 112, 012002 – Published 2 July, 2025

DOI: https://doi.org/10.1103/q4rb-bhcg

Abstract

The multiplicities of positive and negative pions, kaons, and unidentified hadrons produced in deep-inelastic scattering are measured in bins of the Bjorken scaling variable $x$ , the relative virtual-photon energy $y$ , and the fraction of the virtual-photon energy transferred to the final-state hadron $z$ . Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam of both electric charges and a liquid hydrogen target. These measurements cover the kinematic domain with photon virtuality $Q^{2} > 1 (GeV / c)^{2}$ , $0.004 < x < 0.4$ , $0.1 < y < 0.7$ , and $0.2 < z < 0.85$ , in accordance with the kinematic domain used in earlier published COMPASS multiplicity measurements with an isoscalar target. The calculation of radiative corrections was improved by using the Monte Carlo generator djangoh, which results in up to 12% larger corrections in the low- $x$ region.

Physics Subject Headings (PhySH)

Inelastic scattering reactions

Article Text

References (32)

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Phys. Rev. D 112, 012002– Published 2 July, 2025

Vol. 112, Iss. 1 — 1 July 2025

Received 24 October 2024
Accepted 17 February 2025

DOI: https://doi.org/10.1103/q4rb-bhcg

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

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Multiplicities of positive and negative pions, kaons, and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target

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