First Determination of the Weak Charge of the Proton

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ID: 270626
2013
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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.
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zhamkochyan2013physicalfirst Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors 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,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;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;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;
Journal physical review letters
Year 2013
DOI
10.1103/physrevlett.111.141803
URL
https://sciprofiles.com/publication/view/bf0d5852114d2b37ab966aa7d2e5199d
Keywords
http www.w3.org/1998/math/mathml inline math xmlns mtext msup

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