Extraction of $\gamma n\to\pi N$ observables from deuteron-target data - INSPIRE

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Extraction of $\gamma n\to\pi N$ observables from deuteron-target data

Satoshi X. Nakamura
(
- Cruzeiro do Sul U.
)

Aug 7, 2018

6 pages

Published in:

Phys.Rev.C 98 (2018) 4, 042201

Published: Oct 3, 2018

e-Print:

1808.02773 [nucl-th]

DOI:

10.1103/PhysRevC.98.042201 (publication)

Report number:

LFTC-18-10/31,
LFTC-18-10/30

View in:

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Abstract: (APS)

An examination is conducted on a commonly used procedure for extracting (un)polarized γn→π−p and γn→π0n observables from H2(γ,π−)pp and H2(γ,π0)pn data, using a model that consists of the impulse term and the final-state interaction (FSI) terms due to nucleon and pion exchange. Recent experimental and theoretical analyses used an extraction method that does not impose a cut on the final πN invariant mass W. I demonstrate that the use of this method can result in the γn→πN observables that are seriously distorted by the nucleon Fermi motion, and that one can efficiently avoid this problem by imposing a cut on W. It is also shown that the use of kinematical cuts of recent experimental analyses can still leave in the selected samples substantial FSI effects that must be corrected in extracting the γn→πN cross sections. In terms of the nucleon- and pion-exchange mechanisms, I give the first qualitative explanation of the FSI corrections, obtained in a recent Mainz Microtron experiment, for extracting γn→π0n cross sections.

Note:

6 pages, 5 figures. arXiv admin note: text overlap with arXiv:1804.04757; published version after minor modifications

Hadronic Physics and QCD
correction: final-state interaction
deuteron: target
nucleon: exchange
pi: exchange
Mainz Linac
kinematics
photon n --> pi nucleon

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Figures(5)

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