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Azevedo, C.D.R.; Badełek, B.; Balestra, F.; Barth, J.; Beck, R.; Bedfer, Y.; Berenguer Antequera, J.; Bernhard, J.; Bodlak, M.; Bradamante, F.; Büchele, M.; Burtsev, V.E.; Chang, W.-C.; Chiosso, M.; Chumakov, A.G.; Chung, S.-U.; Cicuttin, A.; Dalla Torre, S.; Dasgupta, S.S.; Denisov, O.Yu; Dünnweber, W.; Dusaev, R.R.; Efremov, A.; Finger, M.; Finger, M.; Fischer, H.; Friedrich, J.M.; Gavrichtchouk, O.P.; Gorzellik, M.; Grasso, A.; Grube, B.; Heitz, R.; Horikawa, N.; Ivanov, A.; Iwata, T.; Jandek, M.; Jary, V.; Kaspar, F.; Kerbizi, A.; Ketzer, B.; Klein, F.; Koivuniemi, J.H.; Kondo Horikawa, K.; Konorov, I.; Kouznetsov, O.M.; Kral, Z.; Krinner, F.; Kulinich, Y.; Kurek, K.; Kveton, A.; Lavičková, K.; Levorato, S.; Mallot, G.K.; Martin, A.; Marzec, J.; Mattson, G.; Meshcheryakov, G.V.; Meyer, M.; Mikhasenko, M.; Miyachi, Y.; Neyret, D.; Nukazuka, G.; Nunes, A.S.; Ostrick, M.; Paul, S.; Pekeler, H.; Peshekhonov, D.V.; Pešková, M.; Pochodzalla, J.; Polyakov, V.A.; Rudnicki, T.; Rybnikov, A.; Rychter, A.; Samoylenko, V.D.; Sarkar, S.; Savin, I.A.; Sbrizzai, G.; Slunecka, M.; Steffen, D.; Subrt, O.; Sulc, M.; Suzuki, H.; Sznajder, P.; Tessaro, S.; Thiel, A.; Tomsa, J.; Townsend, A.; Tskhay, V.; Uhl, S.; Vasilishin, B.I.; Vauth, A.; Veit, B.M.; Vidon, A.; Virius, M.; Wagner, M.; Zavada, P.; Zavertyaev, M.; Zemko, M.; Zemlyanichkina, E.; Ziembicki, M.
Physics letters. B, 08/2020, Volume: 807Journal Article
The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, for the first time, for antiprotons and protons. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2 > 1 (GeV/c)2 for the photon virtuality and W>5 GeV/c2 for the invariant mass of the produced hadronic system. Bjorken-x is restricted to the range 0.01 to 0.40. Protons and antiprotons are identified in the momentum range from 20 GeV/c to 60 GeV/c and required to carry a large fraction of the virtual-photon energy, z>0.5. In the whole studied z-region, the p¯ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Kaons were previously analysed in the momentum range 12 GeV/c to 40 GeV/c. In the present analysis this range is extended up to 55 GeV/c, whereby events with larger virtual-photon energies are included in the analysis and the observed K− over K+ ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that at COMPASS energies the phase space available for single-hadron production in deep-inelastic scattering should be taken into account in the standard pQCD formalism.
