New Precision Limit on the Strange Vector Form Factors of the Proton

被引：80

作者：

Ahmed, Z. ^{[1
]}

Allada, K. ^{[2
]}

Aniol, K. A. ^{[3
]}

Armstrong, D. S. ^{[4
]}

Arrington, J. ^{[5
]}

Baturin, P. ^{[6
]}

Bellini, V. ^{[7
]}

Benesch, J. ^{[8
]}

Beminiwattha, R. ^{[9
]}

Benmokhtar, F. ^{[10
]}

Canan, M. ^{[11
]}

Camsonne, A. ^{[8
]}

Cates, G. D. ^{[12
]}

Chen, J. -P. ^{[8
]}

Chudakov, E. ^{[8
]}

Cisbani, E. ^{[13
]}

Dalton, M. M. ^{[12
]}

de Jager, C. W. ^{[12
]}

De Leo, R. ^{[14
]}

Deconinck, W.

Decowski, P. ^{[15
]}

Deng, X. ^{[12
]}

Deur, A.

Dutta, C. ^{[2
]}

Franklin, G. B.

Friend, M.

Frullani, S.

Garibaldi, F.

Giusa, A.

Glamazdin, A. ^{[16
]}

Golge, S.

Grimm, K. ^{[17
]}

Hansen, O.

Higinbotham, D. W.

Holmes, R.

Holmstrom, T. ^{[18
]}

Huang, J. ^{[19
]}

Huang, M. ^{[20
]}

Hyde, C. E. ^{[21
]}

Jen, C. M.

Jin, G.

Jones, D.

Kang, H. ^{[22
]}

King, P.

Kowalski, S. ^{[19
]}

Kumar, K. S. ^{[23
]}

Lee, J. H.

LeRose, J. J.

Liyanage, N.

Long, E. ^{[24
]}

机构：

[1] Syracuse Univ, Syracuse, NY 13244 USA

[2] Univ Kentucky, Lexington, KY 40506 USA

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

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

[5] Argonne Natl Lab, Argonne, IL 60439 USA

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

[7] Univ Catania, Ist Nazl Fis Nucl, Dipt Fis, I-95123 Catania, Italy

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

[9] Ohio Univ, Athens, OH 45701 USA

[10] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

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

[12] Univ Virginia, Charlottesville, VA 22904 USA

[13] Grp Sanita, INFN, Sez Roma, I-00161 Rome, Italy

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

[15] Smith Coll, Northampton, MA 01063 USA

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

[17] Louisiana Tech Univ, Ruston, LA 71272 USA

[18] Longwood Univ, Farmville, VA 23909 USA

[19] MIT, Cambridge, MA 02139 USA

[20] Duke Univ, Durham, NC 27708 USA

[21] Univ Blaise Pascal, Clermont Univ, CNRS IN2P3, Lab Phys Corpusculaire, FR-63000 Clermont Ferrand, France

[22] Seoul Natl Univ, Seoul 151742, South Korea

[23] Univ Massachusetts, Amherst, MA 01003 USA

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

[25] Univ Roma La Sapienza, INFN, Sez Roma, I-00161 Rome, Italy

[26] Temple Univ, Philadelphia, PA 19122 USA

[27] Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

[28] George Washington Univ, Washington, DC 20052 USA

[29] Mississippi State Univ, Starkeville, MS 39762 USA

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

[31] Harvard Univ, Cambridge, MA 02138 USA

[32] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[33] China Inst Atom Energy, Beijing 102413, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 10期

基金：

美国国家科学基金会;

关键词：

SCATTERING; ASYMMETRY;

D O I：

10.1103/PhysRevLett.108.102001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q(2) = 0.624 GeV2 and beam energy E-b = 3.48 GeV to be A(PV) = -23.80 +/- 0.78(stat) +/- 0.36(syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G(E)(s) + 0.517G(M)(s) = 0.003 +/- 0.010(stat) +/- 0.004(syst) +/- 0.009(ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.

引用

页数：5

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