Polarization transfer in the 4He(e,e'p)3H reaction at Q2=0.8 and 1.3 (GeV/c)2

Polarization transfer in the 4He(e,e'p)3H reaction at Q2=0.8 and 1.3 (GeV/c)2

Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction at Q{2}=0.8 and 1.3  (GeV/c){2} with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e,e'p) reaction, contradicting a relativistic distorted-wave appro...

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Veröffentlicht in:Physical review letters 2010-08, Vol.105 (7), p.072001-072001
Hauptverfasser: Paolone, M, Malace, S P, Strauch, S, Albayrak, I, Arrington, J, Berman, B L, Brash, E J, Briscoe, B, Camsonne, A, Chen, J-P, Christy, M E, Chudakov, E, Cisbani, E, Craver, B, Cusanno, F, Ent, R, Garibaldi, F, Gilman, R, Glamazdin, O, Glister, J, Higinbotham, D W, Hyde-Wright, C E, Ilieva, Y, de Jager, C W, Jiang, X, Jones, M K, Keppel, C E, Khrosinkova, E, Kuchina, E, Kumbartzki, G, Lee, B, Lindgren, R, Margaziotis, D J, Meekins, D, Michaels, R, Park, K, Pentchev, L, Perdrisat, C F, Piasetzky, E, Punjabi, V A, Puckett, A J R, Qian, X, Qiang, Y, Ransome, R D, Saha, A, Sarty, A J, Schulte, E, Solvignon, P, Subedi, R R, Tang, L, Tedeschi, D, Tvaskis, V, Udias, J M, Ulmer, P E, Vignote, J R, Wesselmann, F R, Wojtsekhowski, B, Zhan, X
Format: Artikel
Sprache:eng
Schlagworte:
ACCURACY
CHARGE EXCHANGE
FINAL-STATE INTERACTIONS
FORM FACTORS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POLARIZATION
PROTONS
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Zusammenfassung:Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction at Q{2}=0.8 and 1.3  (GeV/c){2} with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e,e'p) reaction, contradicting a relativistic distorted-wave approximation and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.
ISSN:0031-9007
1079-7114