The $\eta^{\prime}$ -carbon potential at low meson momenta - INSPIRE

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The $\eta^{\prime}$ -carbon potential at low meson momenta

CBELSA/TAPS

Collaboration

•

M. Nanova
(
- U. Giessen, II. Phys. Inst.
)

Oct 1, 2018

9 pages

Published in:

Eur.Phys.J.A 54 (2018) 10, 182

Published: Oct 26, 2018

e-Print:

1810.01288 [nucl-ex]

DOI:

10.1140/epja/i2018-12639-6 (publication)

Experiments:

BONN-ELSA-CRYSTAL-BARREL

View in:

reference search17 citations

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Abstract: (Springer)

The production of

\eta^{\prime}

mesons in coincidence with forward-going protons has been studied in photon-induced reactions on

^{12}

C and on a liquid hydrogen (LH

_{2}

) target for incoming photon energies of 1.3-2.6 GeV at the electron accelerator ELSA. The

\eta^{\prime}

mesons have been identified via the

\eta^{\prime} \rightarrow \pi^{0} \pi^{0}\eta \rightarrow 6 \gamma

decay registered with the CBELSA/TAPS detector system. Coincident protons have been identified in the MiniTAPS BaF

_{2}

array at polar angles of

2^{\circ} \le \theta_{p} \le 11^{\circ}

. Under these kinematic constraints the

\eta^{\prime}

mesons are produced with relatively low kinetic energy (

\approx 150

MeV) since the coincident protons take over most of the momentum of the incident-photon beam. For the C-target this allows the determination of the real part of the

\eta^{\prime}

-carbon potential at low meson momenta by comparing with collision model calculations of the

\eta^{\prime}

kinetic energy distribution and excitation function. Fitting the latter data for

\eta^{\prime}

mesons going backwards in the center-of-mass system yields a potential depth of

V = -(44 \pm 16(stat) \pm 15(syst))

MeV, consistent with earlier determinations of the potential depth in inclusive measurements for average

\eta^{\prime}

momenta of

\approx 1.1

GeV/c. Within the experimental uncertainties, there is no indication of a momentum dependence of the

\eta^{\prime}

-carbon potential. The LH

_{2}

data, taken as a reference to check the data analysis and the model calculations, provide differential and integral cross sections in good agreement with previous results for

\eta^{\prime}

photoproduction off the free proton.

Note:

9 pages, 13 figures. arXiv admin note: text overlap with arXiv:1608.06074

14.40.Be
21.65.Jk
25.20.Lj
eta(958): production
energy: kinetic
photon: energy
kinematics: constraint
hydrogen: liquid
momentum dependence
photoproduction

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