Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2 -: art. no. 122001

被引：36

作者：

Laveissière, G ^{[1
]}

Todor, L

Degrande, N

Jaminion, S

Jutier, C

Di Salvo, R

Van Hoorebeke, L

Alexa, LC

Anderson, BD

Aniol, KA

Arundell, K

Audit, G

Auerbach, L

Baker, FT

Baylac, M

Berthot, J

Bertin, PY

Bertozzi, W

Bimbot, L

Boeglin, WU

Brash, EJ

Breton, V

Breuer, H

Burtin, E

Calarco, JR

Cardman, LS

Cavata, C

Chang, CC

Chen, JP

Chudakov, E

Cisbani, E

Dale, DS

de Jager, CW

De Leo, R

Deur, A

d'Hose, N

Dodge, GE

Domingo, JJ

Elouadrhiri, L

Epstein, MB

Ewell, LA

Finn, JM

Fissum, KG

Fonvieille, H

Fournier, G

Frois, B

Frullani, S

Furget, C

Gao, H

Gao, J

机构：

[1] Univ Clermont Ferrand, IN2P3, F-63177 Aubiere, France

[2] Old Dominion Univ, Norfolk, VA 23529 USA

[3] State Univ Ghent, B-9000 Ghent, Belgium

[4] Univ Regina, Regina, SK S4S 0A2, Canada

[5] Kent State Univ, Kent, OH 44242 USA

[6] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA

[7] Coll William & Mary, Williamsburg, VA 23187 USA

[8] CEA Saclay, F-91191 Gif Sur Yvette, France

[9] Temple Univ, Philadelphia, PA 19122 USA

[10] Univ Georgia, Athens, GA 30602 USA

[11] MIT, Cambridge, MA 02139 USA

[12] Inst Phys Nucl, F-91406 Orsay, France

[13] Florida Int Univ, Miami, FL 33199 USA

[14] Univ Maryland, College Pk, MD 20742 USA

[15] Univ New Hampshire, Durham, NH 03824 USA

[16] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

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

[18] Ist Super Sanita, I-00161 Rome, Italy

[19] Univ Kentucky, Lexington, KY 40506 USA

[20] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[21] Univ Bari, I-70126 Bari, Italy

[22] Lab Phys Subatom Cosmol, F-38026 Grenoble, France

[23] Duke Univ, Durham, NC 27706 USA

[24] Hampton Univ, Hampton, VA 23668 USA

[25] Rutgers State Univ, Piscataway, NJ 08855 USA

[26] Kharkov Phys & Technol Inst, UA-61108 Kharkov, Ukraine

[27] Syracuse Univ, Syracuse, NY 13244 USA

[28] Yamagata Univ, Yamagata 990, Japan

[29] Yerevan Phys Inst, Yerevan 375036, Armenia

[30] Tohoku Univ, Sendai, Miyagi 980, Japan

[31] Princeton Univ, Princeton, NJ 08544 USA

[32] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[33] Univ Virginia, Charlottesville, VA 22901 USA

[34] SUNY Stony Brook, Stony Brook, NY 11794 USA

[35] Ist Nazl Fis Nucl, Sez Pavia, ECT, I-38050 Trent, Italy

[36] Univ Pavia, DFNT, Trent, Italy

[37] Norfolk State Univ, Norfolk, VA 23504 USA

[38] Florida State Univ, Tallahassee, FL 32306 USA

[39] N Carolina Cent Univ, Durham, NC 27707 USA

[40] Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[41] Harvard Univ, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.122001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P-LL-P-TT/epsilon and P-LT, and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q(2)) and beta(M)(Q(2)) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q(2), and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q(2), compensated at higher Q(2) by a paramagnetic contribution from piN intermediate states.

引用

页码：122001 / 1

页数：5

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