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Lovato A, Gandolfi S, Carlson J, Pieper SC, Schiavilla R. Neutral weak current two-body contributions in inclusive scattering from 12C. PHYSICAL REVIEW LETTERS 2014; 112:182502. [PMID: 24856692 DOI: 10.1103/physrevlett.112.182502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Indexed: 06/03/2023]
Abstract
An ab initio calculation of the sum rules of the neutral weak response functions in 12C is reported, based on a realistic Hamiltonian, including two- and three-nucleon potentials, and on realistic currents, consisting of one- and two-body terms. We find that the sum rules of the response functions associated with the longitudinal and transverse components of the (spacelike) neutral current are largest and that a significant portion (≃30%) of the calculated strength is due to two-body terms. This fact may have implications for the MiniBooNE and other neutrino quasielastic scattering data on nuclei.
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Affiliation(s)
- A Lovato
- Argonne Leadership Computing Facility, Argonne National Laboratory, Argonne, Illinois 60439, USA and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Gandolfi
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Carlson
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Steven C Pieper
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Schiavilla
- Theory Center, Jefferson Lab, Newport News, Virginia 23606, USA and Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA
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Silva A, Kim HC, Urbano D, Goeke K. Parity-violating asymmetries in elastice→pscattering in the chiral quark-soliton model: Comparison with the A4, G0, HAPPEX and SAMPLE experiments. Int J Clin Exp Med 2006. [DOI: 10.1103/physrevd.74.054011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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3
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Anthony PL, Arnold RG, Arroyo C, Baird K, Bega K, Biesiada J, Bosted PE, Breuer M, Carr R, Cates GD, Chen JP, Chudakov E, Cooke M, Decker FJ, Decowski P, Deur A, Emam W, Erickson R, Fieguth T, Field C, Gao J, Gustafsson K, Hicks RS, Holmes R, Hughes EW, Humensky TB, Jones GM, Kaufman LJ, Kolomensky YG, Kumar KS, Lhuillier D, Lombard-Nelsen R, Mastromarino P, Mayer B, McKeown RD, Michaels R, Olson M, Paschke KD, Peterson GA, Pitthan R, Pope K, Relyea D, Rock SE, Saxton O, Shapiro G, Singh J, Souder PA, Szalata ZM, Tobias WA, Tonguc BT, Turner J, Tweedie B, Vacheret A, Walz D, Weber T, Weisend J, Whittum D, Woods M, Younus I. Observation of parity nonconservation in møller scattering. PHYSICAL REVIEW LETTERS 2004; 92:181602. [PMID: 15169482 DOI: 10.1103/physrevlett.92.181602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Indexed: 05/24/2023]
Abstract
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory).
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Affiliation(s)
- P L Anthony
- Stanford Linear Accelerator Center, Menlo Park, CA 94025, USA
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Ito TM, Averett T, Barkhuff D, Batigne G, Beck DH, Beise EJ, Blake A, Breuer H, Carr R, Clasie B, Covrig S, Danagoulian A, Dodson G, Dow K, Dutta D, Farkhondeh M, Filippone BW, Franklin W, Furget C, Gao H, Gao J, Gustafsson K, Hannelius L, Hasty R, Hawthorne-Allen AM, Herda MC, Jones CE, King P, Korsch W, Kowalski S, Kox S, Kramer K, Lee P, Liu J, Martin JW, McKeown RD, Mueller B, Pitt ML, Plaster B, Quéméner G, Réal JS, Ritter J, Roche J, Savu V, Schiavilla R, Seely J, Spayde D, Suleiman R, Taylor S, Tieulent R, Tipton B, Tsentalovich E, Wells SP, Yang B, Yuan J, Yun J, Zwart T. Parity-violating electron deuteron scattering and the proton's neutral weak axial vector form factor. PHYSICAL REVIEW LETTERS 2004; 92:102003. [PMID: 15089200 DOI: 10.1103/physrevlett.92.102003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2003] [Indexed: 05/24/2023]
Abstract
We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at backward angles at Q2=0.038 (GeV/c)2. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon, which can potentially receive large electroweak corrections. The measured asymmetry A=-3.51+/-0.57 (stat)+/-0.58 (syst) ppm is consistent with theoretical predictions. We also report on updated results of the previous experiment at Q2=0.091 (GeV/c)2, which are also consistent with theoretical predictions.
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Affiliation(s)
- T M Ito
- W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
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Rosner G. How Strange Is the Proton? Science 2000; 290:2083-4. [PMID: 17733051 DOI: 10.1126/science.290.5499.2083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Nucleons (protons and neutrons) have been extensively studied over the past 30 or 40 years, but our knowledge of their internal structure remains rather limited, largely because the nucleon's constituents, the quarks, are so tightly bound that the nucleon cannot be taken apart. As Rosner discusses in his Perspective, scattering experiments are providing increasingly detailed information about the spatial distribution of charges, spins, and currents within the nucleon. He highlights the work by Hasty et al., which goes a long way toward determining the role of "strange" quarks, originally thought not to play a role in ordinary matter.
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Hasty R, Hawthorne-Allen AM, Averett T, Barkhuff D, Beck DH, Beise EJ, Blake A, Breuer H, Carr R, Covrig S, Danagoulian A, Dodson G, Dow K, Farkhondeh M, Filippone BW, Gao J, Herda MC, Ito TM, Jones CE, Korsch W, Kramer K, Kowalski S, Lee P, McKeown RD, Mueller B, Pitt M. Strange magnetism and the anapole structure of the proton. Science 2000; 290:2117-9. [PMID: 11118140 DOI: 10.1126/science.290.5499.2117] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The violation of mirror symmetry in the weak force provides a powerful tool to study the internal structure of the proton. Experimental results have been obtained that address the role of strange quarks in generating nuclear magnetism. The measurement reported here provides an unambiguous constraint on strange quark contributions to the proton's magnetic moment through the electron-proton weak interaction. We also report evidence for the existence of a parity-violating electromagnetic effect known as the anapole moment of the proton. The proton's anapole moment is not yet well understood theoretically, but it could have important implications for precision weak interaction studies in atomic systems such as cesium.
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Affiliation(s)
- R Hasty
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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