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18 April 2024

» arxiv » 1202.1255

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The Qweak Experiment: A Search for New Physics at the TeV Scale via a Measurement of the Proton's Weak Charge
D. S. Armstrong ; A. Asaturyan ; T. Averett ; J. Benesch ; J. Birchall ; P. Bosted ; A. Bruell ; C. L. Capuano ; G. Cates ; C. Carrigee ; R. D. Carlini ; S. Chattopadhyay ; S. Covrig ; C. A. Davis ; K. Dow ; J. Dunne ; D. Dutta ; R. Ent ; J. Erler ; W. Falk ; H. Fenker ; J. M. Finn ; T. A. Forest ; W. Franklin ; D. Gaskell ; M. Gericke ; J. Grames ; K. Grimm ; F. W. Hersman ; D. Higinbotham ; M. Holtrop ; J. R. Hoskins ; K. Johnston ; E. Ihloff ; M. Jones ; R. Jones ; K. Joo ; J. Kelsey ; C. Keppel ; M. Khol ; P. King ; E. Korkmaz ; S. Kowalski ; J. Leacock ; J. P. Leckey ; L. Lee ; A. Lung ; D. Mack ; S. Majewski ; J. Mammei ; J. Martin ; D. Meekins ; A. Micherdzinska ; A. Mkrtchyan ; H. Mkrtchyan ; N. Morgan ; K. E. Myers ; A. Narayan ; A. K. Opper ; J. Pan ; S. A. Page ; K. Paschke ; M. Pitt ; M. Poelker ; Y. Prok ; W. D. Ramsay ; M. Ramsey-Musolf ; J. Roche ; N. Simicevic ; G. Smith ; T. Smith ; P. Souder ; D. Spayde ; B. E. Stokes ; R. Suleiman ; V. Tadevosyan ; E. Tsentalovich ; W. T. H. van Oers ; W. Vulcan ; P. Wang ; S. Wells ; S. A. Wood ; S. Yang ; R. Young ; H. Zhu ; C. Zorn ;
Date:	6 Feb 2012
Abstract:	We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions of the Standard Model and search for new physics. A unique opportunity exists to carry out the first precision measurement of the proton’s weak charge, $Q_W =1 - 4sin^2 heta_W$. A 2200 hour measurement of the parity violating asymmetry in elastic ep scattering at Q^2=0.03 (GeV/c)^2 employing 180 $mu$A of 85% polarized beam on a 35 cm liquid Hydrogen target will determine the proton’s weak charge with approximately 4% combined statistical and systematic errors. The Standard Model makes a firm prediction of $Q_W$, based on the running of the weak mixing angle from the Z0 pole down to low energies, corresponding to a 10 sigma effect in this experiment.
Source:	arXiv, 1202.1255
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