We present measurements of the polarization-transfer components in the reaction, covering a previously unexplored kinematic region with large positive (anti-parallel) missing momentum, , up to , and . 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 and 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 at the level of a few percent. We also compare the measured polarization-transfer components and their ratio for $^{2}$H to those of a free (moving) proton. We find that the universal behavior of $^{2}$H, $^{4}$He and $^{12}$C in the double ratio is maintained in the positive missing-momentum region.
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"title": "Quasi-elastic polarization-transfer measurements on the deuteron in anti-parallel kinematics"
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"value": "We present measurements of the polarization-transfer components in the <math><mmultiscripts><mrow><mtext>H</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>2</mn></mrow></mmultiscripts><mo>(</mo><mover><mrow><mi>e</mi></mrow><mrow><mo>\u2192</mo></mrow></mover><mo>,</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>\u2032</mo></mrow></msup><mover><mrow><mi>p</mi></mrow><mrow><mo>\u2192</mo></mrow></mover><mo>)</mo></math> reaction, covering a previously unexplored kinematic region with large positive (anti-parallel) missing momentum, <math><msub><mrow><mi>p</mi></mrow><mrow><mi>miss</mi></mrow></msub></math>, up to <math><mn>220</mn><mspace width=\"0.25em\"></mspace><mtext>MeV</mtext><mo>/</mo><mi>c</mi></math>, and <math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><mn>0.65</mn></math> <math><msup><mrow><mo>(</mo><mtext>GeV</mtext><mo>/</mo><mi>c</mi><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msup></math>. 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 <math><msub><mrow><mi>P</mi></mrow><mrow><mi>x</mi></mrow></msub></math> and <math><msub><mrow><mi>P</mi></mrow><mrow><mi>z</mi></mrow></msub></math> 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 <math><msub><mrow><mi>G</mi></mrow><mrow><mi>E</mi></mrow></msub><mo>/</mo><msub><mrow><mi>G</mi></mrow><mrow><mi>M</mi></mrow></msub></math> at the level of a few percent. We also compare the measured polarization-transfer components and their ratio for $^{2}$H to those of a free (moving) proton. We find that the universal behavior of $^{2}$H, $^{4}$He and $^{12}$C in the double ratio <math><mfrac><mrow><msup><mrow><mo>(</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>/</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>z</mi></mrow></msub><mo>)</mo></mrow><mrow><mi>A</mi></mrow></msup></mrow><mrow><msup><mrow><mo>(</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>/</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>z</mi></mrow></msub><mo>)</mo></mrow><mrow><mmultiscripts><mrow><mtext>H</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>1</mn></mrow></mmultiscripts></mrow></msup></mrow></mfrac></math> is maintained in the positive missing-momentum region."
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"date": "2019-07-31",
"publisher": "Elsevier"
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