In-medium omega mass from the gamma+Nb --> pi0 gamma+X reaction - INSPIRE

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In-medium omega mass from the gamma+Nb --> pi0 gamma+X reaction

CBELSA/TAPS

Collaboration

•

M. Nanova
(
- Giessen U.
)

May, 2010

12 pages

Published in:

Phys.Rev.C 82 (2010) 035209

e-Print:

1005.5694 [nucl-ex]

DOI:

10.1103/PhysRevC.82.035209

Experiments:

GSI-TAPS

View in:

reference search69 citations

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Abstract: (arXiv)

Data on the photoproduction of

\omega

mesons on nuclei have been re-analyzed in a search for in-medium modifications. The data were taken with the Crystal Barrel(CB)/TAPS detector system at the ELSA accelerator facility in Bonn. First results from the analysis of the data set were published by D. Trnka et al. in Phys. Rev. Lett 94 (2005) 192303 \cite{david}, claiming a lowering of the

\omega

mass in the nuclear medium by 14

%

at normal nuclear matter density. The extracted

\omega

line shape was found to be sensitive to the background subtraction. For this reason a re-analysis of the same data set has been initiated and a new method has been developed to reduce the background and to determine the shape and absolute magnitude of the background directly from the data. Details of the re-analysis and of the background determination are described. The

\omega

signal on the

Nb

target, extracted in the re-analysis, does not show a deviation from the corresponding line shape on a

LH_2

target, measured as reference. The earlier claim of an in-medium mass shift is thus not confirmed. The sensitivity of the

\omega

line shape to different in-medium modification scenarios is discussed.

Note:

13 pages and 11 figures, submitted for publication

21.65.-f
25.20.-x
14.40.Be
nuclear matter: density
pi0: photoproduction
Crystal Barrel
Bonn ELSA Stor
photon nucleus: inclusive reaction
carbon
niobium

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