TY - JOUR
T1 - Quasi-elastic polarization-transfer measurements on the deuteron in anti-parallel kinematics
AU - A1 Collaboration
AU - Paul, S.
AU - Izraeli, D.
AU - Brecelj, T.
AU - Yaron, I.
AU - Achenbach, P.
AU - Arenhövel, H.
AU - Ashkenazi, A.
AU - Beričič, J.
AU - Böhm, R.
AU - Bosnar, D.
AU - Cline, E.
AU - Cohen, E. O.
AU - Debenjak, L.
AU - Distler, M. O.
AU - Esser, A.
AU - Friščić, I.
AU - Gilman, R.
AU - Heilig, M.
AU - Kegel, S.
AU - Klag, P.
AU - Kohl, Y.
AU - Kolar, T.
AU - Korover, I.
AU - Lichtenstadt, J.
AU - Mardor, I.
AU - Merkel, H.
AU - Middleton, D. G.
AU - Mihovilovič, M.
AU - Müller, J.
AU - Müller, U.
AU - Olivenboim, M.
AU - Piasetzky, E.
AU - Pochodzalla, J.
AU - Ron, G.
AU - Schlimme, B. S.
AU - Schoth, M.
AU - Schulz, F.
AU - Sfienti, C.
AU - Širca, S.
AU - Štajner, S.
AU - Strauch, S.
AU - Thiel, M.
AU - Tyukin, A.
AU - Weber, A.
N1 - Publisher Copyright:
© 2019 The Author(s)
PY - 2019/8/10
Y1 - 2019/8/10
N2 - We present measurements of the polarization-transfer components in the H2(e→,e′p→) reaction, covering a previously unexplored kinematic region with large positive (anti-parallel) missing momentum, pmiss, up to 220MeV/c, and Q2=0.65 (GeV/c)2. These measurements, performed at the Mainz Microtron (MAMI), were motivated by theoretical calculations which predict small final-state interaction (FSI) effects in these kinematics, making them favorable for searching for medium modifications of bound nucleons in nuclei. We find in this kinematic region that the measured polarization-transfer components Px and Pz and their ratio agree with the theoretical calculations, which use free-proton form factors. Using this, we establish upper limits on possible medium effects that modify the bound proton's form factor ratio GE/GM at the level of a few percent. We also compare the measured polarization-transfer components and their ratio for 2H to those of a free (moving) proton. We find that the universal behavior of 2H, 4He and 12C in the double ratio [Formula presented] is maintained in the positive missing-momentum region.
AB - We present measurements of the polarization-transfer components in the H2(e→,e′p→) reaction, covering a previously unexplored kinematic region with large positive (anti-parallel) missing momentum, pmiss, up to 220MeV/c, and Q2=0.65 (GeV/c)2. These measurements, performed at the Mainz Microtron (MAMI), were motivated by theoretical calculations which predict small final-state interaction (FSI) effects in these kinematics, making them favorable for searching for medium modifications of bound nucleons in nuclei. We find in this kinematic region that the measured polarization-transfer components Px and Pz and their ratio agree with the theoretical calculations, which use free-proton form factors. Using this, we establish upper limits on possible medium effects that modify the bound proton's form factor ratio GE/GM at the level of a few percent. We also compare the measured polarization-transfer components and their ratio for 2H to those of a free (moving) proton. We find that the universal behavior of 2H, 4He and 12C in the double ratio [Formula presented] is maintained in the positive missing-momentum region.
UR - http://www.scopus.com/inward/record.url?scp=85068564373&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.07.002
DO - 10.1016/j.physletb.2019.07.002
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AN - SCOPUS:85068564373
SN - 0370-2693
VL - 795
SP - 599
EP - 605
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -