First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter
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- 作者：HADES Collaboration ; G. Agakishiev ; A. Bal ; a ; D. Belver ; A. Belyaev ; J.C. Berger-Chen ; A. Blanco ; M. B?hmer ; J.L. Boyard ; P. Cabanelas ; S. Chernenko ; A. Dybczak ; E. Epple ; L. Fabbietti ; O. Fateev ; P. Finocchiaro ; P. Fonte ; J. Friese ; I. Fr?hlich ; T. Galatyuk ; et al.
- 刊名：Physics Letters B
- 出版年：2012
- 出版时间：10 September, 2012
- 年：2012
- 卷：715
- 期：4-5
- 页码：304-309
- 全文大小：466 K
文摘
We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2 % , it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the invariant mass spectra to elementary p + p data, we observe for momenta a strong modification of the shape of the spectrum, which we attribute to an additional ¦Ñ-like contribution and a decrease of ¦Ø yield. These opposite trends are tentatively interpreted as a strong coupling of the ¦Ñ meson to baryonic resonances and an absorption of the ¦Ø meson, which are two aspects of in-medium modification of vector mesons.