Quark fragmentation to π±, π0, K±, p and (p)over-bar in the nuclear environment

被引：109

作者：

Airapetian, A

Akopov, N

Akopov, Z

Amarian, M

Ammosov, VV

Andrus, A

Aschenauer, EC

Augustyniak, W

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Baturin, V

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Blok, HP

Böttcher, H

Borissov, A

Borysenko, A

Bouwhuis, M

Brack, J

Brüll, A

Bryzgalov, V

Capitani, GP

Chiang, HC

Ciullo, G

Contalbrigo, M

Dalpiaz, PF

De Leo, R

De Nardo, L

De Santis, E

Devitsin, E

Di Nezza, P

Düren, M

Ehrenfried, M

Elalaoui-Moulay, A

Elbakian, G

Ellinghaus, F

Elschenbroich, U

Ely, J

Fabbri, R

Fantoni, A

Fechtchenko, A

Felawka, L

Fox, B

Franz, J

Frullani, S

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[2] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[3] Sez Bari, Ist Nazl Fis Nucl, I-70124 Bari, Italy

[4] Univ Colorado, Dept Phys Nucl, Boulder, CO 80309 USA

[5] DESY, Deutsches Elektronen Synchtroton, D-22603 Hamburg, Germany

[6] DESY Zeuthen, D-15738 Zeuthen, Germany

[7] Joint Inst Nucl Res, Dubna 141980, Russia

[8] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[9] Univ Ferrara, Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[10] Univ Ferrara, Ist Nazl Fis Nucl, Dipartimento Fis, I-44100 Ferrara, Italy

[11] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[12] Univ Freiburg, Fac Phys, D-79104 Freiburg, Germany

[13] Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[14] Univ Giessen Klinikum, Inst Phys, D-35392 Giessen, Germany

[15] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[16] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[17] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

[18] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[19] PN Lebedev Phys Inst, Moscow 117924, Russia

[20] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[21] NIKHEF, NL-1009 DB Amsterdam, Netherlands

[22] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[23] Inst High Energy Phys, Protvino 142281, Moscow Region, Russia

[24] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[25] Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy

[26] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy

[27] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

[28] TRIUMF, Vancouver, BC V6T 2A3, Canada

[29] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

[30] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[31] Andrezej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland

[32] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICS LETTERS B | 2003年 / 577卷 / 1-2期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会; 日本学术振兴会;

关键词：

D O I：

10.1016/j.physletb.2003.10.026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The influence of the nuclear medium on lepto-production of hadrons was studied in the HERMES experiment at DESY in semi-inclusive deep-inelastic scattering of 27.6 GeV positrons off deuterium, nitrogen and krypton targets. The differential multiplicity for krypton relative to that of deuterium has been measured for the first time for various identified hadrons (pi(+), pi(-), pi(0), K+, K-, p and (p) over bar) as a function of the virtual photon energy v, the fraction z of this energy transferred to the hadron, and the hadron transverse momentum squared p(t)(2). The multiplicity ratio is strongly reduced in the nuclear medium at low v and high z, with significant differences among the various hadrons. The distribution of the hadron transverse momentum is broadened towards high p(t)(2) in the nuclear medium, in a manner resembling the Cronin effect previously observed in collisions of heavy ions and protons with nuclei. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：37 / 46

页数：10

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