Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering -: art. no. 097101

被引：206

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Amarian, M

Aschenauer, EC

Avakian, H

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Bains, B

Baturin, V

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Böttcher, H

Borissov, A

Bouhali, O

Bouwhuis, M

Brack, J

Brauksiepe, S

Brückner, W

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

Djordjadze, V

Düren, M

Ehrenfried, M

Elbakian, G

Ellinghaus, F

Ely, J

Fantoni, A

Fechtchenko, A

Felawka, L

Filippone, BW

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, Nucl Phys Lab, Boulder, CO 80309 USA

[7] DESY, 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] State 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, NL-1009 DB Amsterdam, Netherlands

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

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

[28] Ist Nazl Fis Nucl, Sez 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：

PHYSICAL REVIEW D | 2001年 / 64卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.64.097101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019 +/-0.007(stat) 0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi (0) asymmetry is of the same size as the pi (+) asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.

引用

页数：4

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