First Determination of the Weak Charge of the Proton

被引：101

作者：

Androic, D. ^{[1
]}

Armstrong, D. S. ^{[2
]}

Asaturyan, A. ^{[3
]}

Averett, T. ^{[2
]}

Balewski, J. ^{[4
]}

Beaufait, J. ^{[5
]}

Beminiwattha, R. S. ^{[6
]}

Benesch, J. ^{[5
]}

Benmokhtar, F. ^{[7
]}

Birchall, J. ^{[8
]}

Carlini, R. D. ^{[2
,5
]}

Cates, G. D. ^{[9
]}

Cornejo, J. C. ^{[2
]}

Covrig, S. ^{[5
]}

Dalton, M. M. ^{[9
]}

Davis, C. A. ^{[10
]}

Deconinck, W. ^{[2
]}

Diefenbach, J. ^{[11
]}

Dowd, J. F. ^{[2
]}

Dunne, J. A. ^{[12
]}

Dutta, D. ^{[12
]}

Duvall, W. S. ^{[13
]}

Elaasar, M. ^{[14
]}

Falk, W. R. ^{[8
]}

Finn, J. M. ^{[2
]}

Forest, T. ^{[15
,16
]}

Gaskell, D.

Gericke, M. T. W. ^{[8
]}

Grames, J.

Gray, V. M. ^{[2
]}

Grimm, K. ^{[16
]}

Guo, F. ^{[4
]}

Hoskins, J. R. ^{[2
]}

Johnston, K. ^{[16
]}

Jones, D. ^{[9
]}

Jones, M. ^{[5
]}

Jones, R. ^{[17
]}

Kargiantoulakis, M. ^{[9
]}

King, P. M. ^{[6
]}

Korkmaz, E. ^{[18
]}

Kowalski, S. ^{[4
]}

Leacock, J.

Leckey, J. ^{[2
]}

Lee, A. R. ^{[13
]}

Lee, J. H. ^{[2
,6
]}

Lee, L. ^{[8
,10
]}

MacEwan, S. ^{[8
]}

Mack, D. ^{[5
]}

Magee, J. A. ^{[2
]}

Mahurin, R. ^{[8
]}

机构：

[1] Univ Zagreb, HR-10002 Zagreb, Croatia

[2] Coll William & Mary, Williamsburg, VA 23185 USA

[3] Yerevan Phys Inst, AI Alikhanyan Natl Sci Lab, Yerevan 0036, Armenia

[4] MIT, Cambridge, MA 02139 USA

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

[6] Ohio Univ, Athens, OH 45701 USA

[7] Christopher Newport Univ, Newport News, VA 23606 USA

[8] Univ Manitoba, Winnipeg, MB R3T 2N2, Canada

[9] Univ Virginia, Charlottesville, VA 22903 USA

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

[11] Hampton Univ, Hampton, VA 23668 USA

[12] Mississippi State Univ, Mississippi State, MS 39762 USA

[13] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[14] Southern Univ New Orleans, New Orleans, LA 70126 USA

[15] Idaho State Univ, Pocatello, ID 83209 USA

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

[17] Univ Connecticut, Storrs, CT 06269 USA

[18] Univ No British Columbia, Prince George, BC V2N 4Z9, Canada

[19] Univ Winnipeg, Winnipeg, MB R3B 2E9, Canada

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

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

[22] Hendrix Coll, Conway, AR 72032 USA

[23] Univ Adelaide, Adelaide, SA 5005, Australia

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 14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;

关键词：

STRANGE FORM-FACTORS; SYMMETRY BREAKING; ANAPOLE MOMENT; PARITY; SCATTERING;

D O I：

10.1103/PhysRevLett.111.141803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Q(weak) experiment has measured the parity-violating asymmetry in (e) over right arrowp elastic scattering at Q(2) = 0.025 (GeV/c)(2), employing 145 mu A of 89% longitudinally polarized electrons on a 34.4 cm long liquid hydrogen target at Jefferson Lab. The results of the experiment's commissioning run, constituting approximately 4% of the data collected in the experiment, are reported here. From these initial results, the measured asymmetry is A(ep) = -279 +/- 35 (stat) +/- 31 (syst) ppb, which is the smallest and most precise asymmetry ever measured in (e) over right arrowp scattering. The small Q(2) of this experiment has made possible the first determination of the weak charge of the proton Q(W)(p) by incorporating earlier parity-violating electron scattering (PVES) data at higher Q(2) to constrain hadronic corrections. The value of Q(W)(p) obtained in this way is Q(W)(p) (PVES) = 0.064 +/- 0.012, which is in good agreement with the standard model prediction of Q(W)(p) (SM) = 0.0710 +/- 0.0007. When this result is further combined with the Cs atomic parity violation (APV) measurement, significant constraints on the weak charges of the up and down quarks can also be extracted. That PVES + APV analysis reveals the neutron's weak charge to be Q(W)(n) (PVES + APV) = -0.975 +/- 0.010.

引用

页数：7

共 54 条

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