Back to Search Start Over

Experimental constraints on the ω–nucleus real potential

Authors :
D. Elsner
Frank Frommberger
Ph. Hoffmeister
Matthew Lang
V. Kleber
R. Schmitz
T. Seifen
Yu. A. Beloglazov
Wolfgang Hillert
Jens Hartmann
D. Piontek
I. V. Lopatin
T. Rostomyan
V. Metag
A. Wilson
B. Krusche
J. Hannappel
M. Gottschall
R. Ewald
K. Makonyi
H. Schmieden
D. E. Bayadilov
D. Kaiser
I. Jaegle
U. Wiedner
K.-T. Brinkmann
H. van Pee
A. Thiel
E. Gutz
Yasser Maghrbi
A. B. Gridnev
Mariana Nanova
D. Walther
U. Thoma
M. Grüner
Ch. Honisch
Ch. Hammann
Ch. Schmidt
J. Müller
K. Fornet-Ponse
Friedemann Zenke
V. Crede
S. Friedrich
P. Drexler
S. Kammer
A. Winnebeck
Steffen Schaepe
F. Dietz
H. Eberhardt
Ch. Wendel
Th. Challand
Ch. Funke
Janus Weil
I. Keshelashvili
D. Hammann
Satoru Hirenzaki
T. Odenthal
T. Dahlke
Hideko Nagahiro
Friedrich Klein
B. Bantes
S. Böse
H. Kalinowsky
R. Beck
Source :
PHYSICS LETTERS B, Physics Letters B, Vol 736, Iss C, Pp 26-32 (2014), Physics Letters B
Publication Year :
2014
Publisher :
Elsevier BV, 2014.

Abstract

In a search for $\omega$ mesic states, the production of $\omega$-mesons in coincidence with forward going protons has been studied in photon induced reactions on $^{12}$C for incident photon energies of 1250 - 3100 MeV. The $\pi^0 \gamma$ pairs from decays of bound or quasi-free $\omega$-mesons have been measured with the CBELSA/TAPS detector system in coincidence with protons registered in the MiniTAPS forward array. Structures in the total energy distribution of the $\pi^0 \gamma$ pairs, which would indicate the population and decay of bound $\omega~^{11}$B states, are not observed. The $\pi^0 \gamma$ cross section of 0.3 nb/MeV/sr observed in the bound state energy regime between -100 and 0 MeV may be accounted for by yield leaking into the bound state regime because of the large in-medium width of the $\omega$-meson. A comparison of the measured total energy distribution with calculations suggests the real part $V_0$ of the $\omega~^{11}$B potential to be small and only weakly attractive with $V_0(\rho=\rho_0) = -15\pm$ 35(stat) $\pm$20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100 - 150 MeV.<br />Comment: 13 pages, 8 figures

Details

ISSN :
03702693
Volume :
736
Database :
OpenAIRE
Journal :
Physics Letters B
Accession number :
edsair.doi.dedup.....32e56499af16f7de995257ec7ecc1ec4
Full Text :
https://doi.org/10.1016/j.physletb.2014.07.004