Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons

被引：46

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Amarian, M

Aschenauer, EC

Avakian, H

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Baturin, V

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Böttcher, H

Borissov, A

Bouhali, O

Bouwhuis, M

Brack, J

Brauksiepe, S

Brüll, A

Brunn, I

Bulten, HJ

Capitani, GP

Chumney, P

Cisbani, E

Ciullo, G

Court, GR

Dalpiaz, PF

De Leo, R

De Nardo, L

De Sanctis, E

De Schepper, D

Devitsin, E

Huberts, PKAD

Di Nezza, P

Düren, M

Ehrenfried, M

Elbakian, G

Ellinghaus, F

Ely, J

Fabbri, R

Fantoni, A

Fechtchenko, A

Felawka, L

Filippone, BW

Fischer, H

Fox, B

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, Sez 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, Deutsch Elektronen Synchrotron, D-22603 Hamburg, Germany

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

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

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

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

[12] Univ Ferrara, Dipartimento Fis, 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] Univ Giessen, Inst Phys, D-35392 Giessen, 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-8046 Garching, Germany

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

[25] NIKHEF, Natl Inst Kernfys Hoge Energiefys, NL-1009 DB Amsterdam, Netherlands

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

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

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

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

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

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

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

[33] Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

来源：

PHYSICS LETTERS B | 2002年 / 535卷 / 1-4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/S0370-2693(02)01780-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：85 / 92

页数：8

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