Multidimensional Study of Hadronization in Nuclei

HERMES Collaboration: A. Airapetian; N. Akopov; Z. Akopov; E.C.; Aschenauer; W. Augustyniak; R. Avakian; A. Avetissian; E. Avetisyan; S.; Belostotski; N. Bianchi; H.P. Blok; A. Borissov; J. Bowles; I. Brodski; V.; Bryzgalov; J. Burns; M. Capiluppi; G.P. Capitani; E. Cisbani; G. Ciullo; M.; Contalbrigo; P.F. Dalpiaz; W. Deconinck; R. De Leo; L. De Nardo; E. De; Sanctis; M. Diefenthaler; P. Di Nezza; M. D\"uren; M. Ehrenfried; G.; Elbakian; F. Ellinghaus; R. Fabbri; A. Fantoni; L. Felawka; S. Frullani; G.; Gapienko; V. Gapienko; G. Gavrilov; V. Gharibyan; F. Giordano; S. Gliske; M.; Golembiovskaya; L. Grigoryan; C. Hadjidakis; M. Hartig; D. Hasch; A.; Hillenbrand; M. Hoek; Y. Holler; I. Hristova; Y. Imazu; A. Ivanilov; H.E.; Jackson; H.S. Jo; S. Joosten; R. Kaiser; G. Karyan; T. Keri; E. Kinney; A.; Kisselev; N. Kobayashi; V. Korotkov; V. Kozlov; P. Kravchenko; V.G.; Krivokhijine; L. Lagamba; L. Lapik\'as; I. Lehmann; P. Lenisa; A. L\'opez; Ruiz; W. Lorenzon; X.-G. Lu; X.-R. Lu; B.-Q. Ma; D. Mahon; N.C.R. Makins,; S.I. Manaenkov; L. Manfr\'e; Y. Mao; B. Marianski; A. Martinez de la Ossa; H.; Marukyan; C.A. Miller; Y. Miyachi; A. Movsisyan; V. Muccifora; M. Murray; A.; Mussgiller; E. Nappi; Y. Naryshkin; A. Nass; M. Negodaev; W.-D. Nowak; L.L.; Pappalardo; R. Perez-Benito; A. Petrosyan; M. Raithel; P.E. Reimer; A.R.; Reolon; C. Riedl; K. Rith; G. Rosner; A. Rostomyan; J. Rubin; D. Ryckbosch,; Y. Salomatin; F. Sanftl; A. Sch\"afer; G. Schnell; B. Seitz; T.-A. Shibata,; V. Shutov; M. Stancari; M. Statera; E. Steffens; J.J.M. Steijger; J. Stewart,; F. Stinzing; S. Taroian; R. Truty; A. Trzcinski; M. Tytgat; A. Vandenbroucke,; Y. Van Haarlem; C. Van Hulse; D. Veretennikov; V. Vikhrov; I. Vilardi; C.; Vogel; S. Wang; S. Yaschenko; Z. Ye; S. Yen; W. Yu; V. Zagrebelnyy; D.; Zeiler; B. Zihlmann; P. Zupranski

arXiv:1107.3496·hep-ex·September 28, 2011

Multidimensional Study of Hadronization in Nuclei

HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C., Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S., Belostotski, N. Bianchi, H.P. Blok, A. Borissov, J. Bowles, I. Brodski, V., Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani

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TL;DR

This study investigates how different hadrons are produced in nuclei during deep-inelastic scattering, revealing new features in their multiplicity ratios and behaviors across various kinematic variables.

Contribution

It provides a multidimensional analysis of hadronization in nuclei, highlighting differences among hadron types and kinematic dependencies not previously observed.

Findings

01

Positive kaons do not show the expected rise in multiplicity ratio at high z.

02

Protons exhibit distinct behavior compared to other hadrons.

03

New features observed in hadron multiplicity ratios as functions of multiple variables.

Abstract

Hadron multiplicities in semi-inclusive deep-inelastic scattering were measured on neon, krypton and xenon targets relative to deuterium at an electron(positron)-beam energy of 27.6 GeV at HERMES. These ratios were determined as a function of the virtual-photon energy nu, its virtuality Q2, the fractional hadron energy z and the transverse hadron momentum with respect to the virtual-photon direction pt . Dependences were analysed separately for positively and negatively charged pions and kaons as well as protons and antiprotons in a two-dimensional representation. Compared to the one-dimensional dependences, some new features were observed. In particular, when z > 0.4 positive kaons do not show the strong monotonic rise of the multiplicity ratio with nu as exhibited by pions and negative kaons. Protons were found to behave very differently from the other hadrons.

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