Measurement of the in-medium Φ-meson width in proton–nucleus collisions

Measurement of the in-medium Φ-meson width in proton–nucleus collisions

We measured the production of Φ mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles via the Φ → K+K- decay using the COSY-ANKE magnetic spectrometer. The Φ meson production cross section follows a target mass dependence of A0.56±0.02 in the momentum region of 0.6-1....

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Veröffentlicht in:Physics letters. B 2010-10, Vol.695 (1-4)
Hauptverfasser: Polyanskiy, A., Hartmann, M., Kiselev, Yu. T., Paryev, E. Ya, Büscher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kämpfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Ströher, H., Trusov, S., Valdau, Yu, Wilkin, C., Wüstner, P.
Format: Artikel
Sprache:eng
Schlagworte:
CROSS SECTIONS
DECAY
MAGNETIC SPECTROMETERS
MESONS
nuclear medium effects
phi meson production
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PRODUCTION
PROTONS
TARGETS
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Zusammenfassung:We measured the production of Φ mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles via the Φ → K+K- decay using the COSY-ANKE magnetic spectrometer. The Φ meson production cross section follows a target mass dependence of A0.56±0.02 in the momentum region of 0.6-1.6 GeV/c. Moreover, the comparison of the data with model calculations suggests that the in-medium Φ width is about an order of magnitude larger than its free value.
ISSN:0370-2693
1873-2445