Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen

被引：49

作者：

Airapetian A. ^{[31
]}

Akopov N. ^{[31
]}

Akopov Z. ^{[31
]}

Amarian M. ^{[23
,26
,31
]}

Arrington J. ^{[2
]}

Aschenauer E.C. ^{[7
,13
,23
]}

Avakian H. ^{[11
]}

Avakian R. ^{[31
]}

Avetissian A. ^{[31
]}

Avetissian E. ^{[31
]}

Bailey P. ^{[15
]}

Bains B. ^{[15
]}

Baumgarten C. ^{[21
]}

Beckmann M. ^{[12
]}

Belostotski S. ^{[24
]}

Bernreuther S. ^{[9
]}

Bianchi N. ^{[11
]}

Böttcher H. ^{[7
]}

Borissov A. ^{[6
,14
]}

Bouwhuis M. ^{[15
]}

Brack J. ^{[5
]}

Brauksiepe S. ^{[12
]}

Braun B. ^{[9
,21
]}

Brückner W. ^{[14
]}

Brüll A. ^{[14
,18
]}

Budz P. ^{[9
]}

Bulten H.J. ^{[17
,23
,30
]}

Capitani G.P. ^{[11
]}

Carter P. ^{[4
]}

Chumney P. ^{[22
]}

Cisbani E. ^{[26
]}

Court G.R. ^{[16
]}

Dalpiaz P.F. ^{[10
]}

de Leo R. ^{[3
]}

de Nardo L. ^{[1
]}

de Sanctis E. ^{[11
]}

de Schepper D. ^{[2
,18
]}

Devitsin E. ^{[20
]}

de Witt Huberts P.K.A. ^{[23
]}

Di Nezza P. ^{[11
]}

Djordjadze V. ^{[7
]}

Düren M. ^{[9
]}

Dvoredsky A. ^{[4
]}

Elbakian G. ^{[31
]}

Ely J. ^{[5
]}

Fantoni A. ^{[11
]}

Fechtchenko A. ^{[8
]}

Ferro-Luzzi M. ^{[23
]}

Fiedler K. ^{[9
]}

Filippone B.W. ^{[4
]}

机构：

[1] Department of Physics, University of Alberta, Edmonton

[2] Physics Division, Argonne National Laboratory, Argonne

[3] Istituto Nazionale di Fisica Nucleare, Sezione di Bari

[4] W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena

[5] Nuclear Physics Laboratory, University of Colorado, Boulder

[6] DESY, Deutsches Elektronen Synchrotron

[7] DESY Zeuthen

[8] Joint Institute for Nuclear Research

[9] Physikalisches Institut, Universität Erlangen-Nürnberg

[10] Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara

[11] Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

[12] Fakultät für Physik, Universitüt Freiburg

[13] Department of Subatomic and Radiation Physics, University of Gent

[14] Max-Planck-Institut für Kernphysik

[15] Department of Physics, University of Illinois, Urbana

[16] Physics Department, University of Liverpool

[17] Department of Physics, University of Wisconsin-Madison, Madison

[18] Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge

[19] Randall Laboratory of Physics, University of Michigan, Ann Arbor

[20] Lebedev Physical Institute

[21] Sektion Physik, Universität München

[22] Department of Physics, New Mexico State University, Las Cruces

[23] Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF)

[24] Petersburg Nuclear Physics Institute, St. Petersburg, Gatchina

[25] Institut für Theoretische Physik, Unversität Regensburg

[26] Istituto Nazionale di Fisica Nucleare, Sezione Roma 1-Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità

[27] Department of Physics, Simon Fraser University, Burnaby

[28] TRIUMF, Vancouver

[29] Department of Physics, Tokyo Institute of Technology

[30] Department of Physics and Astronomy, Vrije Universiteit

[31] Yerevan Physics Institute, 375036, Yerevan

来源：

The European Physical Journal C - Particles and Fields | 2001年 / 21卷 / 4期

关键词：

Hydrogen; Total Energy; Momentum Transfer; Energy Fraction; Neutral Pion;

D O I：

10.1007/s100520100765

中图分类号：

学科分类号：

摘要：

Measurements of the individual multiplicities of π+, π- and π0 produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to z ≈ 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z ≈ 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 ± 0.01(stat.) ± 0.08(syst.) and 0.26 ± 0.01(stat.) ± 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q2 and the Bjorken variable χ. The observed dependence on Q2 agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on χ is consistent with that of previous data after corrections have been made for the expected Q2-dependence.

引用

页码：599 / 606

页数：7

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