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Acha A, Aniol KA, Armstrong DS, Arrington J, Averett T, Bailey SL, Barber J, Beck A, Benaoum H, Benesch J, Bertin PY, Bosted P, Butaru F, Burtin E, Cates GD, Chao YC, Chen JP, Chudakov E, Cisbani E, Craver B, Cusanno F, De Leo R, Decowski P, Deur A, Feuerbach RJ, Finn JM, Frullani S, Fuchs SA, Fuoti K, Gilman R, Glesener LE, Grimm K, Grames JM, Hansen JO, Hansknecht J, Higinbotham DW, Holmes R, Holmstrom T, Ibrahim H, de Jager CW, Jiang X, Katich J, Kaufman LJ, Kelleher A, King PM, Kolarkar A, Kowalski S, Kuchina E, Kumar KS, Lagamba L, LaViolette P, LeRose J, Lindgren RA, Lhuillier D, Liyanage N, Margaziotis DJ, Markowitz P, Meekins DG, Meziani ZE, Michaels R, Moffit B, Nanda S, Nelyubin V, Otis K, Paschke KD, Phillips SK, Poelker M, Pomatsalyuk R, Potokar M, Prok Y, Puckett A, Qian X, Qiang Y, Reitz B, Roche J, Saha A, Sawatzky B, Singh J, Slifer K, Sirca S, Snyder R, Solvignon P, Souder PA, Stutzman ML, Subedi R, Suleiman R, Sulkosky V, Tobias WA, Ulmer PE, Urciuoli GM, Wang K, Whitbeck A, Wilson R, Wojtsekhowski B, Yao H, Ye Y, Zhan X, Zheng X, Zhou S, Ziskin V. Precision measurements of the nucleon strange form factors at Q2 approximately 0.1 GeV2. Phys Rev Lett 2007; 98:032301. [PMID: 17358678 DOI: 10.1103/physrevlett.98.032301] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Indexed: 05/14/2023]
Abstract
We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with <theta(lab)> approximately 6.0 degrees . The 4He result is A(PV)=(+6.40+/-0.23(stat)+/-0.12(syst))x10(-6). The hydrogen result is A(PV)=(-1.58+/-0.12(stat)+/-0.04(syst))x10(-6). These results significantly improve constraints on the electric and magnetic strange form factors G(E)(s) and G(M)(s). We extract G(E)(s)=0.002+/-0.014+/-0.007 at <Q(2)>=0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 at <Q(2)>=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
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Affiliation(s)
- A Acha
- Florida International University, Miami, Florida 33199, USA
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Rvachev MM, Benmokhtar F, Penel-Nottaris E, Aniol KA, Bertozzi W, Boeglin WU, Butaru F, Calarco JR, Chai Z, Chang CC, Chen JP, Chudakov E, Cisbani E, Cochran A, Cornejo J, Dieterich S, Djawotho P, Duran W, Epstein MB, Finn JM, Fissum KG, Frahi-Amroun A, Frullani S, Furget C, Garibaldi F, Gayou O, Gilad S, Gilman R, Glashausser C, Hansen JO, Higinbotham DW, Hotta A, Hu B, Iodice M, Iomni R, de Jager CW, Jiang X, Jones MK, Kelly JJ, Kox S, Kuss M, Laget JM, De Leo R, Lerose JJ, Liatard E, Lindgren R, Liyanage N, Lourie RW, Malov S, Margaziotis DJ, Markowitz P, Merchez F, Michaels R, Mitchell J, Mougey J, Perdrisat CF, Punjabi VA, Quéméner G, Ransome RD, Réal JS, Roché R, Sabatié F, Saha A, Simon D, Strauch S, Suleiman R, Tamae T, Templon JA, Tieulent R, Ueno H, Ulmer PE, Urciuoli GM, Voutier E, Wijesooriya K, Wojtsekhowski B. Quasielastic 3He(e,e'p)2H reaction at Q2 = 1.5 GeV2 for recoil momenta up to 1 GeV/c. Phys Rev Lett 2005; 94:192302. [PMID: 16090165 DOI: 10.1103/physrevlett.94.192302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Indexed: 05/03/2023]
Abstract
We have studied the quasielastic 3He(e,e(')p)2H reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The 3He(e,e(')p)2H cross section was measured for missing momenta up to 1000 MeV/c, while the A(TL) asymmetry was extracted for missing momenta up to 660 MeV/c. For missing momenta up to 150 MeV/c, the cross section is described by variational calculations using modern 3He wave functions. For missing momenta from 150 to 750 MeV/c, strong final-state interaction effects are observed. Near 1000 MeV/c, the experimental cross section is more than an order of magnitude larger than predicted by available theories. The A(TL) asymmetry displays characteristic features of broken factorization with a structure that is similar to that generated by available models.
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Affiliation(s)
- M M Rvachev
- Massachusetts Institute of Technology, Cambridge, 02139, USA
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Benmokhtar F, Rvachev MM, Penel-Nottaris E, Aniol KA, Bertozzi W, Boeglin WU, Butaru F, Calarco JR, Chai Z, Chang CC, Chen JP, Chudakov E, Cisbani E, Cochran A, Cornejo J, Dieterich S, Djawotho P, Duran W, Epstein MB, Finn JM, Fissum KG, Frahi-Amroun A, Frullani S, Furget C, Garibaldi F, Gayou O, Gilad S, Gilman R, Glashausser C, Hansen JO, Higinbotham DW, Hotta A, Hu B, Iodice M, Iomni R, de Jager CW, Jiang X, Jones MK, Kelly JJ, Kox S, Kuss M, Laget JM, De Leo R, Lerose JJ, Liatard E, Lindgren R, Liyanage N, Lourie RW, Malov S, Margaziotis DJ, Markowitz P, Merchez F, Michaels R, Mitchell J, Mougey J, Perdrisat CF, Punjabi VA, Quéméner G, Ransome RD, Réal JS, Roché R, Sabatié F, Saha A, Simon D, Strauch S, Suleiman R, Tamae T, Templon JA, Tieulent R, Ueno H, Ulmer PE, Urciuoli GM, Voutier E, Wijesooriya K, Wojtsekhowski B. Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta. Phys Rev Lett 2005; 94:082305. [PMID: 15783882 DOI: 10.1103/physrevlett.94.082305] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Indexed: 05/24/2023]
Abstract
Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and missing energies in the continuum region, up to pion threshold; this kinematic coverage is much more extensive than that of any previous experiment. The cross section data are presented along with the effective momentum density distribution and compared to theoretical models.
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Affiliation(s)
- F Benmokhtar
- Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
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