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Title: Nuclear-Matter Modification of Decay Widths in the {phi}{yields}e{sup +}e{sup -} and {phi}{yields}K{sup +}K{sup -} Channels

Abstract

The invariant mass spectra of {phi}{yields}K{sup +}K{sup -} are measured in 12 GeV p+A reactions in order to search for the in-medium modification of {phi} mesons. The observed K{sup +}K{sup -} spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three {beta}{gamma} regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K{sup +}K{sup -} decay channel is compared to the simultaneously measured e{sup +}e{sup -} decay channel for carbon and copper targets. We parameterize the production yields as {sigma}(A)={sigma}{sub 0}A{sup {alpha}} and obtain {alpha}{sub {phi}}{sub {yields}}{sub K{sup +}}{sub K{sup -}}-{alpha}{sub {phi}}{sub {yields}}{sub e{sup +}}{sub e{sup -}} to be 0.14{+-}0.12. Limits are obtained for the partial decay widths of the {phi} mesons in nuclear matter.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ;  [2];  [3]
  1. Department of Physics, Kyoto University, Kitashirakawa Sakyo-ku, Kyoto 606-8502 (Japan)
  2. Institute of Particle and Nuclear Studies, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
  3. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan) (and others)
Publication Date:
OSTI Identifier:
20951232
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.98.152302; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BREIT-WIGNER FORMULA; CARBON; COPPER; ELECTRON-POSITRON INTERACTIONS; ELECTRONS; GEV RANGE 10-100; KAONS MINUS; KAONS PLUS; MASS NUMBER; MASS SPECTRA; MODIFICATIONS; NUCLEAR MATTER; PAIR PRODUCTION; PARTICLE DECAY; PHI MESONS; POSITRONS; RELATIVISTIC RANGE

Citation Formats

Sakuma, F., Fukao, Y., Funahashi, H., Ishino, M., Kanda, H., Kitaguchi, M., Mihara, S., Miwa, K., Miyashita, T., Murakami, T., Nakura, T., Togawa, M., Yamada, S., Yoshimura, Y., Chiba, J., Ieiri, M., Sasaki, O., Sekimoto, M., Tanaka, K. H., and En'yo, H.. Nuclear-Matter Modification of Decay Widths in the {phi}{yields}e{sup +}e{sup -} and {phi}{yields}K{sup +}K{sup -} Channels. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.152302.
Sakuma, F., Fukao, Y., Funahashi, H., Ishino, M., Kanda, H., Kitaguchi, M., Mihara, S., Miwa, K., Miyashita, T., Murakami, T., Nakura, T., Togawa, M., Yamada, S., Yoshimura, Y., Chiba, J., Ieiri, M., Sasaki, O., Sekimoto, M., Tanaka, K. H., & En'yo, H.. Nuclear-Matter Modification of Decay Widths in the {phi}{yields}e{sup +}e{sup -} and {phi}{yields}K{sup +}K{sup -} Channels. United States. doi:10.1103/PHYSREVLETT.98.152302.
Sakuma, F., Fukao, Y., Funahashi, H., Ishino, M., Kanda, H., Kitaguchi, M., Mihara, S., Miwa, K., Miyashita, T., Murakami, T., Nakura, T., Togawa, M., Yamada, S., Yoshimura, Y., Chiba, J., Ieiri, M., Sasaki, O., Sekimoto, M., Tanaka, K. H., and En'yo, H.. Fri . "Nuclear-Matter Modification of Decay Widths in the {phi}{yields}e{sup +}e{sup -} and {phi}{yields}K{sup +}K{sup -} Channels". United States. doi:10.1103/PHYSREVLETT.98.152302.
@article{osti_20951232,
title = {Nuclear-Matter Modification of Decay Widths in the {phi}{yields}e{sup +}e{sup -} and {phi}{yields}K{sup +}K{sup -} Channels},
author = {Sakuma, F. and Fukao, Y. and Funahashi, H. and Ishino, M. and Kanda, H. and Kitaguchi, M. and Mihara, S. and Miwa, K. and Miyashita, T. and Murakami, T. and Nakura, T. and Togawa, M. and Yamada, S. and Yoshimura, Y. and Chiba, J. and Ieiri, M. and Sasaki, O. and Sekimoto, M. and Tanaka, K. H. and En'yo, H.},
abstractNote = {The invariant mass spectra of {phi}{yields}K{sup +}K{sup -} are measured in 12 GeV p+A reactions in order to search for the in-medium modification of {phi} mesons. The observed K{sup +}K{sup -} spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three {beta}{gamma} regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K{sup +}K{sup -} decay channel is compared to the simultaneously measured e{sup +}e{sup -} decay channel for carbon and copper targets. We parameterize the production yields as {sigma}(A)={sigma}{sub 0}A{sup {alpha}} and obtain {alpha}{sub {phi}}{sub {yields}}{sub K{sup +}}{sub K{sup -}}-{alpha}{sub {phi}}{sub {yields}}{sub e{sup +}}{sub e{sup -}} to be 0.14{+-}0.12. Limits are obtained for the partial decay widths of the {phi} mesons in nuclear matter.},
doi = {10.1103/PHYSREVLETT.98.152302},
journal = {Physical Review Letters},
number = 15,
volume = 98,
place = {United States},
year = {Fri Apr 13 00:00:00 EDT 2007},
month = {Fri Apr 13 00:00:00 EDT 2007}
}