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
收藏
页码：122001 / 1
页数：5
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