First determination of the weak charge of the proton

D. Androic; D. S. Armstrong; A. Asaturyan; T. Averett; J. Balewski; J. Beaufait; R. S. Beminiwattha; J. Benesch; F. Benmokhtar; J. Birchall; R. D. Carlini; G. D. Cates; J. C. Cornejo; S. Covrig; M. M. Dalton; C. A. Davis; W. Deconinck; J. Diefenbach; J. F. Dowd; J. A. Dunne; D. Dutta; W. S. Duvall; M. Elaasar; W. R. Falk; J. M. Finn; T. Forest; D. Gaskell; M. T.W. Gericke; J. Grames; V. M. Gray; K. Grimm; F. Guo; J. R. Hoskins; K. Johnston; D. Jones; M. Jones; R. Jones; M. Kargiantoulakis; P. M. King; E. Korkmaz; S. Kowalski; J. Leacock; J. Leckey; A. R. Lee; J. H. Lee; L. Lee; S. Macewan; D. Mack; J. A. Magee; R. Mahurin; J. Mammei; J. W. Martin; M. J. McHugh; D. Meekins; J. Mei; R. Michaels; A. Micherdzinska; A. Mkrtchyan; H. Mkrtchyan; N. Morgan; K. E. Myers; A. Narayan; L. Z. Ndukum; V. Nelyubin; Nuruzzaman; W. T.H. Van Oers; A. K. Opper; S. A. Page; J. Pan; K. D. Paschke; S. K. Phillips; M. L. Pitt; M. Poelker; J. F. Rajotte; W. D. Ramsay; J. Roche; B. Sawatzky; T. Seva; M. H. Shabestari; R. Silwal; N. Simicevic; G. R. Smith; P. Solvignon; D. T. Spayde; A. Subedi; R. Subedi; R. Suleiman; V. Tadevosyan; W. A. Tobias; V. Tvaskis; B. Waidyawansa; P. Wang; S. P. Wells; S. A. Wood; S. Yang; R. D. Young; S. Zhamkochyan

doi:10.1103/PhysRevLett.111.141803

First determination of the weak charge of the proton

D. Androic, D. S. Armstrong, A. Asaturyan, T. Averett, J. Balewski, J. Beaufait, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carlini, G. D. Cates, J. C. Cornejo, S. Covrig, M. M. Dalton, C. A. Davis, W. Deconinck, J. Diefenbach, J. F. Dowd, J. A. DunneD. Dutta, W. S. Duvall, M. Elaasar, W. R. Falk, J. M. Finn, T. Forest, D. Gaskell, M. T.W. Gericke, J. Grames, V. M. Gray, K. Grimm, F. Guo, J. R. Hoskins, K. Johnston, D. Jones, M. Jones, R. Jones, M. Kargiantoulakis, P. M. King, E. Korkmaz, S. Kowalski, J. Leacock, J. Leckey, A. R. Lee, J. H. Lee, L. Lee, S. Macewan, D. Mack, J. A. Magee, R. Mahurin, J. Mammei, J. W. Martin, M. J. McHugh, D. Meekins, J. Mei, R. Michaels, A. Micherdzinska, A. Mkrtchyan, H. Mkrtchyan, N. Morgan, K. E. Myers, A. Narayan, L. Z. Ndukum, V. Nelyubin, Nuruzzaman, W. T.H. Van Oers, A. K. Opper, S. A. Page, J. Pan, K. D. Paschke, S. K. Phillips, M. L. Pitt, M. Poelker, J. F. Rajotte, W. D. Ramsay, J. Roche, B. Sawatzky, T. Seva, M. H. Shabestari, R. Silwal, N. Simicevic, G. R. Smith, P. Solvignon, D. T. Spayde, A. Subedi, R. Subedi, R. Suleiman, V. Tadevosyan, W. A. Tobias, V. Tvaskis, B. Waidyawansa, P. Wang, S. P. Wells, S. A. Wood, S. Yang, R. D. Young, S. Zhamkochyan

Research output: Contribution to journal › Article › peer-review

Abstract

The Q_weak experiment has measured the parity-violating asymmetry in e→p elastic scattering at Q2=0.025 (GeV/c)2, employing 145 μA 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→p scattering. The small Q2 of this experiment has made possible the first determination of the weak charge of the proton QWp by incorporating earlier parity-violating electron scattering (PVES) data at higher Q2 to constrain hadronic corrections. The value of QWp obtained in this way is QWp(PVES)=0.064±0.012, which is in good agreement with the standard model prediction of QWp(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 QWn(PVES+APV)=-0.975±0.010.

Original language	English
Article number	141803
Journal	Physical Review Letters
Volume	111
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.111.141803
Publication status	Published - 2 Oct 2013
Externally published	Yes

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10.1103/PhysRevLett.111.141803

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Androic, D., Armstrong, D. S., Asaturyan, A., Averett, T., Balewski, J., Beaufait, J., Beminiwattha, R. S., Benesch, J., Benmokhtar, F., Birchall, J., Carlini, R. D., Cates, G. D., Cornejo, J. C., Covrig, S., Dalton, M. M., Davis, C. A., Deconinck, W., Diefenbach, J., Dowd, J. F., ... Zhamkochyan, S. (2013). First determination of the weak charge of the proton. Physical Review Letters, 111(14), Article 141803. https://doi.org/10.1103/PhysRevLett.111.141803

@article{bc7e0ed326e54ce79d9d73a400202467,

title = "First determination of the weak charge of the proton",

abstract = "The Qweak experiment has measured the parity-violating asymmetry in e→p elastic scattering at Q2=0.025 (GeV/c)2, employing 145 μA 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 Aep=- 279±35 (stat) ± 31 (syst) ppb, which is the smallest and most precise asymmetry ever measured in e→p scattering. The small Q2 of this experiment has made possible the first determination of the weak charge of the proton QWp by incorporating earlier parity-violating electron scattering (PVES) data at higher Q2 to constrain hadronic corrections. The value of QWp obtained in this way is QWp(PVES)=0.064±0.012, which is in good agreement with the standard model prediction of QWp(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 QWn(PVES+APV)=-0.975±0.010.",

author = "D. Androic and Armstrong, \{D. S.\} and A. Asaturyan and T. Averett and J. Balewski and J. Beaufait and Beminiwattha, \{R. S.\} and J. Benesch and F. Benmokhtar and J. Birchall and Carlini, \{R. D.\} and Cates, \{G. D.\} and Cornejo, \{J. C.\} and S. Covrig and Dalton, \{M. M.\} and Davis, \{C. A.\} and W. Deconinck and J. Diefenbach and Dowd, \{J. F.\} and Dunne, \{J. A.\} and D. Dutta and Duvall, \{W. S.\} and M. Elaasar and Falk, \{W. R.\} and Finn, \{J. M.\} and T. Forest and D. Gaskell and Gericke, \{M. T.W.\} and J. Grames and Gray, \{V. M.\} and K. Grimm and F. Guo and Hoskins, \{J. R.\} and K. Johnston and D. Jones and M. Jones and R. Jones and M. Kargiantoulakis and King, \{P. M.\} and E. Korkmaz and S. Kowalski and J. Leacock and J. Leckey and Lee, \{A. R.\} and Lee, \{J. H.\} and L. Lee and S. Macewan and D. Mack and Magee, \{J. A.\} and R. Mahurin and J. Mammei and Martin, \{J. W.\} and McHugh, \{M. J.\} and D. Meekins and J. Mei and R. Michaels and A. Micherdzinska and A. Mkrtchyan and H. Mkrtchyan and N. Morgan and Myers, \{K. E.\} and A. Narayan and Ndukum, \{L. Z.\} and V. Nelyubin and Nuruzzaman and \{Van Oers\}, \{W. T.H.\} and Opper, \{A. K.\} and Page, \{S. A.\} and J. Pan and Paschke, \{K. D.\} and Phillips, \{S. K.\} and Pitt, \{M. L.\} and M. Poelker and Rajotte, \{J. F.\} and Ramsay, \{W. D.\} and J. Roche and B. Sawatzky and T. Seva and Shabestari, \{M. H.\} and R. Silwal and N. Simicevic and Smith, \{G. R.\} and P. Solvignon and Spayde, \{D. T.\} and A. Subedi and R. Subedi and R. Suleiman and V. Tadevosyan and Tobias, \{W. A.\} and V. Tvaskis and B. Waidyawansa and P. Wang and Wells, \{S. P.\} and Wood, \{S. A.\} and S. Yang and Young, \{R. D.\} and S. Zhamkochyan",

year = "2013",

month = oct,

day = "2",

doi = "10.1103/PhysRevLett.111.141803",

language = "English",

volume = "111",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "14",

}

Androic, D, Armstrong, DS, Asaturyan, A, Averett, T, Balewski, J, Beaufait, J, Beminiwattha, RS, Benesch, J, Benmokhtar, F, Birchall, J, Carlini, RD, Cates, GD, Cornejo, JC, Covrig, S, Dalton, MM, Davis, CA, Deconinck, W, Diefenbach, J, Dowd, JF, Dunne, JA, Dutta, D, Duvall, WS, Elaasar, M, Falk, WR, Finn, JM, Forest, T, Gaskell, D, Gericke, MTW, Grames, J, Gray, VM, Grimm, K, Guo, F, Hoskins, JR, Johnston, K, Jones, D, Jones, M, Jones, R, Kargiantoulakis, M, King, PM, Korkmaz, E, Kowalski, S, Leacock, J, Leckey, J, Lee, AR, Lee, JH, Lee, L, Macewan, S, Mack, D, Magee, JA, Mahurin, R, Mammei, J, Martin, JW, McHugh, MJ, Meekins, D, Mei, J, Michaels, R, Micherdzinska, A, Mkrtchyan, A, Mkrtchyan, H, Morgan, N, Myers, KE, Narayan, A, Ndukum, LZ, Nelyubin, V, Nuruzzaman, Van Oers, WTH, Opper, AK, Page, SA, Pan, J, Paschke, KD, Phillips, SK, Pitt, ML, Poelker, M, Rajotte, JF, Ramsay, WD, Roche, J, Sawatzky, B, Seva, T, Shabestari, MH, Silwal, R, Simicevic, N, Smith, GR, Solvignon, P, Spayde, DT, Subedi, A, Subedi, R, Suleiman, R, Tadevosyan, V, Tobias, WA, Tvaskis, V, Waidyawansa, B, Wang, P, Wells, SP, Wood, SA, Yang, S, Young, RD & Zhamkochyan, S 2013, 'First determination of the weak charge of the proton', Physical Review Letters, vol. 111, no. 14, 141803. https://doi.org/10.1103/PhysRevLett.111.141803

TY - JOUR

T1 - First determination of the weak charge of the proton

AU - Androic, D.

AU - Armstrong, D. S.

AU - Asaturyan, A.

AU - Averett, T.

AU - Balewski, J.

AU - Beaufait, J.

AU - Beminiwattha, R. S.

AU - Benesch, J.

AU - Benmokhtar, F.

AU - Birchall, J.

AU - Carlini, R. D.

AU - Cates, G. D.

AU - Cornejo, J. C.

AU - Covrig, S.

AU - Dalton, M. M.

AU - Davis, C. A.

AU - Deconinck, W.

AU - Diefenbach, J.

AU - Dowd, J. F.

AU - Dunne, J. A.

AU - Dutta, D.

AU - Duvall, W. S.

AU - Elaasar, M.

AU - Falk, W. R.

AU - Finn, J. M.

AU - Forest, T.

AU - Gaskell, D.

AU - Gericke, M. T.W.

AU - Grames, J.

AU - Gray, V. M.

AU - Grimm, K.

AU - Guo, F.

AU - Hoskins, J. R.

AU - Johnston, K.

AU - Jones, D.

AU - Jones, M.

AU - Jones, R.

AU - Kargiantoulakis, M.

AU - King, P. M.

AU - Korkmaz, E.

AU - Kowalski, S.

AU - Leacock, J.

AU - Leckey, J.

AU - Lee, A. R.

AU - Lee, J. H.

AU - Lee, L.

AU - Macewan, S.

AU - Mack, D.

AU - Magee, J. A.

AU - Mahurin, R.

AU - Mammei, J.

AU - Martin, J. W.

AU - McHugh, M. J.

AU - Meekins, D.

AU - Mei, J.

AU - Michaels, R.

AU - Micherdzinska, A.

AU - Mkrtchyan, A.

AU - Mkrtchyan, H.

AU - Morgan, N.

AU - Myers, K. E.

AU - Narayan, A.

AU - Ndukum, L. Z.

AU - Nelyubin, V.

AU - Nuruzzaman,

AU - Van Oers, W. T.H.

AU - Opper, A. K.

AU - Page, S. A.

AU - Pan, J.

AU - Paschke, K. D.

AU - Phillips, S. K.

AU - Pitt, M. L.

AU - Poelker, M.

AU - Rajotte, J. F.

AU - Ramsay, W. D.

AU - Roche, J.

AU - Sawatzky, B.

AU - Seva, T.

AU - Shabestari, M. H.

AU - Silwal, R.

AU - Simicevic, N.

AU - Smith, G. R.

AU - Solvignon, P.

AU - Spayde, D. T.

AU - Subedi, A.

AU - Subedi, R.

AU - Suleiman, R.

AU - Tadevosyan, V.

AU - Tobias, W. A.

AU - Tvaskis, V.

AU - Waidyawansa, B.

AU - Wang, P.

AU - Wells, S. P.

AU - Wood, S. A.

AU - Yang, S.

AU - Young, R. D.

AU - Zhamkochyan, S.

PY - 2013/10/2

Y1 - 2013/10/2

N2 - The Qweak experiment has measured the parity-violating asymmetry in e→p elastic scattering at Q2=0.025 (GeV/c)2, employing 145 μA 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 Aep=- 279±35 (stat) ± 31 (syst) ppb, which is the smallest and most precise asymmetry ever measured in e→p scattering. The small Q2 of this experiment has made possible the first determination of the weak charge of the proton QWp by incorporating earlier parity-violating electron scattering (PVES) data at higher Q2 to constrain hadronic corrections. The value of QWp obtained in this way is QWp(PVES)=0.064±0.012, which is in good agreement with the standard model prediction of QWp(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 QWn(PVES+APV)=-0.975±0.010.

AB - The Qweak experiment has measured the parity-violating asymmetry in e→p elastic scattering at Q2=0.025 (GeV/c)2, employing 145 μA 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 Aep=- 279±35 (stat) ± 31 (syst) ppb, which is the smallest and most precise asymmetry ever measured in e→p scattering. The small Q2 of this experiment has made possible the first determination of the weak charge of the proton QWp by incorporating earlier parity-violating electron scattering (PVES) data at higher Q2 to constrain hadronic corrections. The value of QWp obtained in this way is QWp(PVES)=0.064±0.012, which is in good agreement with the standard model prediction of QWp(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 QWn(PVES+APV)=-0.975±0.010.

U2 - 10.1103/PhysRevLett.111.141803

DO - 10.1103/PhysRevLett.111.141803

M3 - Article

AN - SCOPUS:84885151071

SN - 0031-9007

VL - 111

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 141803

ER -

First determination of the weak charge of the proton

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