A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality Q2 > 1 (GeV=c)2, invariant mass of the hadronic system W > 5 GeV=c2, Bjorken scaling variable in the range 0.003 < x < 0.4, fraction of the virtual photon energy carried by the hadron in the range 0.2 < z < 0.8, and square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV=c)2 < P2h T < 3 (GeV=c)2. The multiplicities are presented as a function of P2h T in three-dimensional bins of x, Q2, z and compared to previous semi-inclusive measurements. We explore the small-P2hT region, i.e. P2hT < 1 (GeV=c)2, where hadron transverse momenta are expected to arise from nonperturbative effects, and also the domain of larger P2hT, where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small P2hT to study the dependence of the average transverse momentum (P2 hT) on x, Q2 and z. The power-law behavior of the multiplicities at large PhT is investigated using various functional forms. The fits describe the data reasonably well over the full measured range.

Original languageEnglish
Article number032005
JournalPhysical Review D
Issue number3
StatePublished - 1 Feb 2018


FundersFunder number
CERN-RFBR12-02-91500, NSh-999.2014.2
DFG Cluster of Excellence “Origin and Structure of the Universe
Daiko and Yamada Foundations
QREN123600/2011, CERN/FIS-NUC/0017/2015, CERN/FP 116376/ 2010
National Science Foundation
California Department of Fish and Game
Seventh Framework Programme283286
Seventh Framework Programme
Missouri University of Science and Technology
European Commission
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Japan Society for the Promotion of Science20540299, 18540281, 8002006
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Ministerstvo Školství, Mládeže a TělovýchovyLG13031
Ministerstvo Školství, Mládeže a Tělovýchovy
Bundesministerium für Bildung und Forschung
Ministry of Education, Youth and Science
Israel Academy of Sciences and Humanities
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki2015/18/M/ST2/00550
Narodowe Centrum Nauki
Narodowym Centrum Nauki
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Bundesministerium für Bildung und Frauen
Fundació Catalana de Trasplantament


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