Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS

6533b7defe1ef96bd1276996

RESEARCH PRODUCT

Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS

G. D. Alexeev W. Dünnweber R. Heitz O.yu. Denisov A. Gridin M. A. Faessler W.-d. Nowak R. Beck A. Kerbizi G.v. Meshcheryakov A. Srnka Yu. V. Mikhailov F. Kunne M. Grosse Perdekamp C.-y. Hsieh V. Frolov V. Frolov Soumen Paul A. Grasso W. Augustyniak Miroslav Sulc P. Sznajder D.v. Peshekhonov O.p. Gavrichtchouk Martin Bodlak L. Sinha T. Matsuda G. Nukazuka A. Townsend D. Steffen D. Steffen A. Thiel M. Stolarski Yu. Kisselev Pietro Faccioli F. Tessarotto Jan Tomsa M.g. Alexeev S. Uhl A.v. Efremov J. Giarra I. Gnesi M. Ostrick Franco Bradamante V. Anosov M. Mikhasenko M. Mikhasenko A. Rychter J. Lichtenstadt Andres Cicuttin A. Moretti K. Zaremba V.d. Samoylenko V.a. Polyakov V.n. Kolosov A.g. Olshevsky A. Maltsev M. Quaresma M. Quaresma A.b. Ivanov Alexandr Selyunin I. Denisenko S. Dalla Torre G. Sbrizzai M. Zemko A. Amoroso Arseniy Rybnikov Nour Makke W. C. Chang D. Neyret C. Chatterjee Y. Miyachi D. D'ago C. Naim Yuxiang Zhao Johannes Bernhard Johannes Bernhard Ch. Dreisbach A. Guskov B.m. Veit B.m. Veit R.r. Dusaev M. V. Zavertyaev V. Tskhay Anne-laure Martin A. Sandacz Antonin Kveton C. Franco B. Badelek D.i. Ryabchikov D.i. Ryabchikov F. Tosello K. Kondo Horikawa M. Meyer M. Meyer G. Mattson A.g. Chumakov B. Ketzer E. M. Kabuß C. Quintans V.f. Konstantinov S. Wallner Norihiro Doshita N. D'hose J.f.c.a. Veloso Yakov Petrovich Kulinich S. Ishimoto J. Nový H. Schmieden I.a. Savin H. Fischer A. Antoshkin M. Slunečka M. Slunečka J.m. Friedrich J. Smolik O.m. Kouznetsov J. Berenguer Antequera O. Subrt O. Subrt S. Huber A. Vidon B. Marianski Kamil Augsten Kamil Augsten Bakur Parsamyan J. Pretz Valery E. Lyubovitskij E. Zemlyanichkina S. Platchkov P. Zavada R.p. Kurjata M. Jandek A. Maggiora Maria Liz Crespo K. Lavickova R. Longo S. Levorato Frank Klein Markus Ball S.a. Mamon S. V. Donskov M. Pešek V. Jary A.s. Nunes A. Koval B. Ventura B. Grube Y.-s. Lian S. Sarkar J. Pochodzalla D. Panzieri Janusz Marzec M. Chiosso Alessandro Bressan D. Von Harrach F. Kaspar W. Meyer K. Kurek T. Rudnicki P.m.m. Correia I. Konorov I. Konorov Aram Kotzinian A. Magnon Jen-chieh Peng B.i. Vasilishin P. Jörg V.e. Burtsev F. Gautheron F. Gautheron N. Mitrofanov Z. Kral S.s. Dasgupta A. Nagaytsev F. Balestra N. Pierre N. Pierre Naomi C R Makins S. Gerassimov S. Gerassimov C. Riedl M. Büchele A. Vauth A. Vauth M. Finger N. Horikawa J.h. Koivuniemi J.h. Koivuniemi T. Iwata M. Gorzellik M. Ziembicki M. Pešková M. Virius S. Tessaro G.v. Khaustov P.d. Eversheim H. Suzuki C.d.r. Azevedo M. Wagner H. Pekeler F. Krinner Yu.a. Khokhlov J. Barth Gerhard K. Mallot Gerhard K. Mallot R. Joosten S. Dasgupta V. Andrieux V. Andrieux S.-u. Chung Y. Bedfer E. Mitrofanov François Herrmann P.-j. Lin Jan Matousek G. Reicherz

subject

Proton Isoscalar Hadron 0 [higher-order]Deep-inelastic scattering target: isoscalar 01 natural sciences COMPASS deep inelastic scattering [muon+ nucleon]High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex)[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]anti-p: multiplicity Invariant mass isoscalar [target]Nuclear Experiment (nucl-ex)Nuclear Experiment Hadron multiplicities Nuclear Experiment Quantum chromodynamics Physics multiplicity [K+]quark: fragmentation function higher-order: 0 K+: multiplicity photon perturbation theory: higher-order higher-order: 1 multiplicity [anti-p]lcsh:QC1-999 Bjorken [scaling]beam [muon]factorization [cross section]1 [higher-order]Particle Physics - Experiment perturbation theory [quantum chromodynamics]Nuclear and High Energy Physics FOS: Physical sciences ratio [multiplicity]530 pQCD fragmentation function [quark]scaling: Bjorken x-dependence Nuclear physics Quantum chromodynamics; pQCD; Deep-inelastic scattering; Hadron multiplicities; COMPASS phase space 0103 physical sciences ddc:530 quantum chromodynamics: perturbation theory 010306 general physics muon+ nucleon: deep inelastic scattering p: multiplicity Muon multiplicity [K-]multiplicity: ratio 010308 nuclear & particles physics hep-ex muon: beam cross section: factorization CERN SPS Deep inelastic scattering multiplicity: measured [charged particle]higher-order [perturbation theory]K-: multiplicity Antiproton High Energy Physics::Experiment lcsh:Physics Quantum chromodynamics charged particle: multiplicity: measured hadronization multiplicity [p]experimental results

description

The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2$ > 1 (GeV/$c$)$^2$ for the photon virtuality and $W > 5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. The range in Bjorken-$x$ is restricted to $0.01 < x < 0.40$. Protons and antiprotons are identified in the momentum range $20 ��60$ GeV/$c$. In the whole studied $z$-region, the $\bar{\rm p}$ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Extending our earlier analysis of the K$^-$ over K$^+$ multiplicity ratio by including now events with larger virtual-photon energies, this ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that the phase space available for hadronisation should be taken into account in the pQCD formalism.

year	journal	country	edition	language
2020-10-08

10.1016/j.physletb.2020.135600 https://hal.archives-ouvertes.fr/hal-02917313