New Precision Limit on the Strange Vector Form Factors of the Proton

Ahmed, Z.; Allada, K.; Aniol, K.; Armstrong, David; Arrington, J.; Baturin, P.; Bellini, V.; Benesch, J.; Beminiwattha, R.; Benmokhtar, F.; Canan, M.; Camsonne, A.; Cates, G. D.; Chen, J. P.; Chudakov, E.; Cisbani, E.; Dalton, M. M.; Jager, C. W. de; Лео, Р. Де; Deconinck, W.; Decowski, P.; Deng, X.; Deur, A.; Dutta, C.; Franklin, G.; Friend, M.; Frullani, S.; Garibaldi, F.; Giusa, A.; Glamazdin, A.; Golge, S.; Grimm, K.; Hansén, O.; Higinbotham, D. W.; Holmes, R.; Holmstrom, T.; Huang, J.; Huang, Min; Hyde‐Wright, C. E.; Jen, C. M.; Gao, Jin; Jones, D.; Kang, H.; P, King; Kowalski, S.; Kumar, Krishna; Lee, Jeong Han; LeRose, J.; Liyanage, N.; Long, E.; McNulty, D.; Margaziotis, D. J.; Meddi, F.; Meekins, D.; Mercado, L.; Meziani, Z. E.; Michaels, R.; Muñoz-Camacho, C.; Mihovilovič, M.; Muangma, N.; Myers, K. E.; Nanda, S.; Narayan, A.; Nelyubin, V.; Nuruzzaman, Md.; Oh, Yongseok; Pan, K.; Parno, D. S.; Paschke, K.; Phillips, S. K.; Qian, X.; Qiang, Y.; Quinn, B.; Rakhman, A.; Reimer, P. E.; Rider, Keith B.; Riordan, S.; Roche, J.; Rubin, J.; Russo, G.; Saenboonruang, Kiadtisak; Saha, A.; Sawatzky, B.; Silwal, R.; Širca, S.; Souder, P. A.; Sperduto, M. L.; Subedi, R.; Suleiman, R.; Sulkosky, V.; Sutera, C.M.; Tobias, W. A.; Urciuoli, G. M.; Waidyawansa, B.; Wang, D.; Wexler, J.; Wilson, Richard; Wojtsekhowski, B.; Zhan, X.; Yan, X.; Huang, Yao; Ye, L.; Zhao, B.; Zheng, X.

doi:10.1103/physrevlett.108.102001

Cited by 90 publications

(41 citation statements)

References 22 publications

(16 reference statements)

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“…The uncertainty of the asymmetry reported here is less than that of previous parity-violating electron scattering (PVES) experiments [10][11][12][13][14][15][16][17][18][19][20][21] directed at obtaining hadronic axial and strange form-factor information [22]. The theoretical interpretability of the Q weak measurement is very clean as it relies primarily on those previous PVES data instead of theoretical calculations to account for residual hadronic structure effects, which are significantly suppressed at the kinematics of this experiment.…”

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confidence: 72%

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First Determination of the Weak Charge of the Proton

Androić¹,

Ds²,

Asaturyan³

et al. 2013

Phys. Rev. Lett.

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128

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confidence: 72%

“…Following the procedure outlined in [6,22], a global fit of asymmetries measured in PVES [10][11][12][13][14][15][16][17][18][19][20][21] on hydrogen, deuterium, and 4 He targets was used to extract Q p W from Eq. (4).…”

mentioning

confidence: 99%

First Determination of the Weak Charge of the Proton

Androić¹,

Ds²,

Asaturyan³

et al. 2013

Phys. Rev. Lett.

Self Cite

128

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“…In this work we perform a global fit of the five parameters: ξ p V , ξ n V , ρ s , μ s (these two linked to the electric and magnetic strange form factors [6]) and the axial-vector form factor at zero momentum transfer: G ep A ≡ G ep A ð0Þ. Our predictions, based on a statistical analysis of the full set of PV asymmetry data for elastic ep scattering (SAMPLE [12], HAPPEX [13][14][15][16], PVA4 [17][18][19], G0 [20,21] and Q-weak [2]) as well as the two PV elastic e- 4 He data (HAPPEX [15,22]), are compared with all previous analyses presented in the literature.…”

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confidence: 99%

Global analysis of parity-violating asymmetry data for elastic electron scattering

2014

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We perform a statistical analysis of the full set of parity-violating asymmetry data for elastic electron scattering including the most recent high precision measurement from Q-weak. Given the basis of the present analysis, our estimates appear to favor nonzero vector strangeness, specifically, positive (negative) values for the electric (magnetic) strange form factors. We also provide an accurate estimate of the axialvector nucleon form factor at zero momentum transfer, G ep A ð0Þ. Our study shows G ep A ð0Þ to be importantly reduced with respect to the currently accepted value. We also find our analysis of data to be compatible with the Standard Model values for the weak charges of the proton and neutron. DOI: 10.1103/PhysRevD.90.033002 PACS numbers: 12.15.-y, 14.20.Dh, 14.65.Bt, 25.30.Bf Over the years parity-violating (PV) electron scattering has provided a great deal of precise information on the structure of the nucleon. A variety of experiments running on different targets, from hydrogen to heavier systems with emphasis on deuterium and helium, have added strong constraints on the electroweak form factors. Moreover, the high precision reached by the most recent experiments [1,2] will serve as a test of the Standard Model (SM) providing a significant constraint on nonperturbative QCD effects.The Q-weak Collaboration has recently determined the weak charge of the proton corresponding to the analysis of approximately 4% of the data collected in the experiment [2]. The main objective of the Q-weak experiment is to provide a value of sin 2 θ W with a 0.3% precision, that is, the weak charge of the proton to 4%. This extremely small uncertainty will provide a significant test of the SM. In [2] a global fit of data taken for hydrogen, deuterium and helium targets up to jQ 2 j ¼ 0.6 ðGeV=cÞ 2 was also done providing some estimates for the weak neutral current (WNC) couplings. These results are compatible with the ones obtained in previous analyses performed by Young and collaborators [3,4]. However, the use of data only up to jQ 2 j ¼ 0.6 ðGeV=cÞ 2 [in the case of [3] only data for jQ 2 j < 0.3 ðGeV=cÞ 2 were considered], in addition to particular assumptions for the Q 2 expansion of the form factors, have convinced us of the necessity of a new and more complete analysis of the process. Moreover, when such high levels of precision are the goal, mixing data for elastic scattering on the proton and 4 He with those corresponding to the quasielastic (QE) process, make it difficult to disentangle effects due to the nucleon structure from others directly linked to final state interactions, offshell effects, few-body nuclear structure, etc. Accordingly, in this work we restrict ourselves to elastic electron scattering processes, and make use of all available data in the literature with no restriction on the Q 2 range considered.The PV asymmetry (A PV ) in the case of elastic electronproton (ep) scattering may be written as follows [5]:

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“…Four experimental programs in three laboratories, the Generation II PVES experiments, followed. The experiments were SAMPLE at the MIT Bates laboratory [16][17][18], the HAPPEX program at JLab [19][20][21], G0 at JLab [22,23], and the A4 program at Mainz [24][25][26]. By the time these programs were well underway, PVES had become accepted as a standard technique in electromagnetic facilities.…”

Section: History Of the Fieldmentioning

confidence: 99%

Parity violation in electron scattering

Souder

Paschke

2015

Front. Phys.

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By comparing the cross sections for left-and right-handed electrons scattered from various unpolarized nuclear targets, the small parity-violating asymmetry can be measured. These asymmetry data probe a wide variety of important topics, including searches for new fundamental interactions and important features of nuclear structure that cannot be studied with other probes. A special feature of these experiments is that the results are interpreted with remarkably few theoretical uncertainties, which justifies pushing the experiments to the highest possible precision. To measure the small asymmetries accurately, a number of novel experimental techniques have been developed.

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New Precision Limit on the Strange Vector Form Factors of the Proton

Cited by 90 publications

References 22 publications

First Determination of the Weak Charge of the Proton

First Determination of the Weak Charge of the Proton

Global analysis of parity-violating asymmetry data for elastic electron scattering

Parity violation in electron scattering

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