Hadron formation in deep-inelastic positron scattering in a nuclear environment

被引：137

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Akushevich, I

Amarian, M

Arrington, J

Aschenauer, EC

Avakian, H

Avakian, R

Avetissia, A

Avetissian, E

Bailey, P

Bains, B

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Böttcher, H

Borissov, A

Bouwhuis, M

Brack, J

Brauksiepe, S

Braun, B

Brückner, W

Brüll, A

Budz, P

Bulten, HJ

Capitani, GP

Carter, P

Chumney, P

Cisbani, E

Court, GR

Dalpiaz, PF

De Leo, R

De Nardo, L

De Sanctis, E

De Schepper, D

Devitsin, E

Huberts, PKAD

Di Nezza, P

Djordjadze, V

Düren, M

Dvoredsky, A

Elbakian, G

Ely, J

Fantoni, A

Fechtchenko, A

Felawka, L

Ferro-Luzzi, M

机构：

[1] Yerevan Phys Inst, Yerevan 375036, Armenia

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

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

[4] Ist Nazl Fis Nucl, Sezione Bari, I-70124 Bari, Italy

[5] CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA

[6] Univ Colorado, Phys Nucl Lab, Boulder, CO 80309 USA

[7] DESY, D-22603 Hamburg, Germany

[8] DESY, D-15738 Zeuthen, Germany

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

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

[11] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[12] Ist Nazl Fis Nucl, Sezione Ferrara, I-44100 Ferrara, Italy

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

[14] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

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

[16] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

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

[18] Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England

[19] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

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

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

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

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

[24] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[25] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

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

[27] Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy

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

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

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

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

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

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 2001年 / 20卷 / 03期

关键词：

D O I：

10.1007/s100520100697

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The influence of the nuclear medium on the production of charged hadrons in semi-inclusive deep-inelastic scattering has been studied by the HERMES experiment at DESY using a 27.5 GeV positron beam. The differential multiplicity of charged hadrons and identified charged pions from nitrogen relative to that from deuterium has been measured as a function of the virtual photon energy nu and the fraction z of this energy transferred to the hadron. There are observed substantial reductions of the multiplicity ratio R-M(h) at low nu and at high z, both of which are well described by a gluon-bremsstrahlung model of hadronization. A significant difference of the nu -dependence of R-M(h) is found between positive and negative A hadrons. This is interpreted in terms of a difference between the formation times of protons and pions, using a phenomenological model to describe the nu- and z-dependence of R-M(h).

引用

页码：479 / 486

页数：8

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