First Determination of the Weak Charge of the Proton

Androić, D.; Ds, Armstrong; Asaturyan, A.; Averett, T.; Balewski, J.; Beaufait, J.; Beminiwattha, R.; Benesch, J.; Benmokhtar, F.; Bírchall, J.; Rd, Carlini; Gd, Cates; Cornejo, J. C.; Covrig, S.; Dalton, M. M.; Davis, CA; Deconinck, W.; Diefenbach, J.; Jf, Dowd; Dunne, J.; Dutta, D.; Ws, Duvall; Elaasar, M.; Wr, Falk; Jm, Finn; Forest, Tony A.; Gaskell, D.; Mt, Gericke; Grames, J.; Gray, V. M.; Grimm, K.; Guo, Fei; Hoskins,; Johnston, K.; Jones, D.; Jones, M.; Jones, R. T.; Kargiantoulakis, M.; P, King; Korkmaz, E.; Kowalski, S.; Leacock, J.; Leckey, J.; Ar, Lee; Jh, Lee; L, Lee; MacEwan, S.; Mack, D.; Ja, Magee; Mahurin, R.; Mammei, J.; Jw, Martin; Mj, McHugh; Meekins, D.; Mei, J.; Michaels, R.; Micherdzińska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Morgan, N.; Ke, Myers; Narayan, A.; Lz, Ndukum; Nelyubin,; Nuruzzaman, Md.; Wt, van Oers; Ak, Opper; Page, Stacey; Pan, Jing; Kd, Paschke; Sk, Phillips; Pitt, M. Louise M.; Poelker, M.; Jf, Rajotte; Wd, Ramsay; Roche, J.; Sawatzky, B.; Ševa, T.; Mh, Shabestari; Silwal, R.; Šimičević, N.; Smith, G. R.; Solvignon, P.; Dt, Spayde; Subedi, A.; Subedi, R.; Suleiman, R.; Tadevosyan,; Wa, Tobias; Tvaskis,; Waidyawansa, B.; Wang, P; Sp, Wells; Sa, Wood; Yang, Shin Nan; Young, R.; Zhamkochyan, S.

doi:10.1103/physrevlett.111.141803

Cited by 127 publications

(99 citation statements)

References 47 publications

(64 reference statements)

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“…The analysis of the Q weak commissioning data set yielded the smallest and most precise measurement of the parity violating elastic electron-proton asymmetry of -0.279 ± 0.035 Stat ± 0.031 Sys ppm [167]. Using this result in a global fit of the parity violating electron scattering (PVES) asymmetries (see Table 8.2, one calculation shows a good agreement with the measurement while the others are significantly off.…”

Section: The Determination Of the Weak Charge Of The Protonmentioning

confidence: 93%

“…The ongoing analysis of the full data set is expected to be completed by the end of 2014. But the analysis of the commissioning data set (about 4% of the total data set) is complete and will be published in the near future as a proof of concept of the data analysis [167]. The complete analysis of the commissioning data is presented in the dissertation of R. Beminiwattha [41] and was not repeated in this dissertation.…”

Section: The Determination Of the Weak Charge Of The Protonmentioning

confidence: 99%

See 1 more Smart Citation

A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup

Waidyawansa

2013

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The beam normal single spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable of the imaginary part of the two-photon exchange process. Moreover, it is a potential source of false asymmetry in parity violating electron scattering experiments. The Q weak experiment uses parity violating electron scattering to make a direct measurement of the weak charge of the proton. The targeted 4% measurement of the weak charge of the proton probes for parity violating new physics beyond the Standard Model. The beam normal single spin asymmetry at Q weak kinematics is at least three orders of magnitude larger than 5 ppb precision of the parity violating asymmetry. To better understand this parity conserving background, the Q weak Collaboration has performed elastic scattering measurements with fully transversely polarized electron beam on the proton and aluminum. This dissertation presents the analysis of the 3% measurement (1.3% statistical and 2.6% systematic) of beam normal single spin asymmetry in electronproton scattering at a Q 2 of 0.025 (GeV/c) 2 . It is the most precise existing measurement of beam normal single spin asymmetry available at the time. A measurement of this precision helps to improve the theoretical models on beam normal single spin asymmetry and thereby our understanding of the doubly virtual Compton scattering process.

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Section: The Determination Of the Weak Charge Of The Protonmentioning

confidence: 93%

Section: The Determination Of the Weak Charge Of The Protonmentioning

confidence: 99%

A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup

Waidyawansa

2013

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“…The experimental constraints on the effective coupling constants can be used to deduce mass reach of new PV physics interactions (see Figure 4 right panel). A combined search based on a precision SoLID-PVDIS measurement and final results from the Qweak [2] experiment can increase the sensitivity to PV new physics interactions at higher mass scales.…”

Section: Physics Motivationsmentioning

confidence: 99%

Precision Measurements of Parity-Violation in Deep Inelastic Scattering using SoLID

Beminiwattha¹

2016

Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015)

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A new proposal to measure parity violating deep inelastic asymmetry (PVDIS) will provide a precision test of the Standard Model through an unique constraints on axial-vector neutral electronquark effective couplings and a precision measurement of the weak mixing angle. We plan to measure the asymmetry to about 0.5% precision over the Bjoken x from 0.3 to 0.7 where the PV asymmetry is approximately independent of hadronic structure. If any deviations observed, the residual hadronic and new physics contributions in the asymmetry could be separated by kinematic dependence of the PVDIS asymmetry. At the proposed precision level, asymmetry will be sensitive to novel hadronic structure effects including charge symmetry violation (CSV) effects and higher twist effects. Observation of these effects itself will be beneficial to building better theoretical models. A deuterium target will be used for Standard Model tests while a d/u quark distribution ratio measurement is proposed using a hydrogen target. The broad reach in kinematic and high statistical precision at which PVDIS asymmetries are planned to measure, a large angle acceptance, high luminosity, and large azimuthal acceptance device is a necessity. We are proposing a new spectrometer based on a solenoid magnet called Solenoidal Large Intensity Device (SoLID) that will provide broad range of electroweak and QCD physics measurements to be conducted at the Jefferson Laboratory. The apparatus will have set of tracking gas electron multiplier (GEM) detectors, a gas Cerenkov detector, and a sampling electromagnetic calorimeter to provide particle identification. The experiment will be conducted as a high rate counting mode experiment.

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“…The yellow ellipse shows the results from the SLAC 122 experiment. The vertical band is the latest C 1q results [10]. The red ellipse is the combined result from all published measurements.…”

Section: Deep Inelastic Regionmentioning

confidence: 99%

Parity Violation Deep Inelastic Scattering Experiments at JLab

Sulkosky¹

2016

Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015)

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We report on the measurement of parity-violating asymmetries in the nucleon resonance and deep inelastic scattering (DIS) regions for longitudinally polarized electrons scattered from unpolarized deuterons. The effective weak couplings, denoted by C 2q , are accessible through the measured inclusive DIS asymmetries. In these proceedings, we present a measurement of the parity-violating asymmetry, from which a determination of 2C 2u -C 2d with an improved precision of a factor of five relative to the previous result was achieved. This result indicates evidence with 95% confidence that the 2C 2u -C 2d is non-zero. This experiment also provides the first parity-violation data covering the full resonance region, which provides constraints on nucleon resonance models. Finally, the program to extend these measurements at Jefferson Lab in the 12 GeV era using the Solenoidal Large Intensity Device is also mentioned.

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First Determination of the Weak Charge of the Proton

Cited by 127 publications

References 47 publications

A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup

A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup

Precision Measurements of Parity-Violation in Deep Inelastic Scattering using SoLID

Parity Violation Deep Inelastic Scattering Experiments at JLab

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