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Title: SEARCH FOR IN-MEDIUM MODIFICATIONS OF THE ρ MESON

Abstract

The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, and here we present preliminary results. All three vector mesons, ρ, ω,and φ, are observed via their decay to e +e -, in order to reduce the effects of final state interactions in the nucleus. Of particular interest is possible in-medium effects on the properties of the ρ meson. The ρ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no effects on the mass of the ρ meson, however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.

Authors:
; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
903314
Report Number(s):
JLAB-PHY-07-623; DOE/OR/23177-0045
TRN: US0703239
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: Int.J.Mod.Phys.A; Journal Volume: 22; Conference: 9th International Workshop On Meson Production, Properties And Interaction (MESON 2006) 9-13 Jun 2006, Cracow, Poland
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CARBON; CEBAF ACCELERATOR; DECAY; DEUTERIUM; FINAL-STATE INTERACTIONS; IRON; MESONS; MODIFICATIONS; NUCLEI; PHOTOPRODUCTION; PRODUCTION; RESONANCE; SPECTRAL FUNCTIONS; SPECTROMETERS; TITANIUM; VECTOR MESONS; Vector mesons, medium modification effects

Citation Formats

WEYGAND, D P, DJALALI, C, NASSERIPOUR, R, and WOOD, M. SEARCH FOR IN-MEDIUM MODIFICATIONS OF THE ρ MESON. United States: N. p., 2007. Web. doi:10.1142/S0217751X07035562.
WEYGAND, D P, DJALALI, C, NASSERIPOUR, R, & WOOD, M. SEARCH FOR IN-MEDIUM MODIFICATIONS OF THE ρ MESON. United States. doi:10.1142/S0217751X07035562.
WEYGAND, D P, DJALALI, C, NASSERIPOUR, R, and WOOD, M. Mon . "SEARCH FOR IN-MEDIUM MODIFICATIONS OF THE ρ MESON". United States. doi:10.1142/S0217751X07035562. https://www.osti.gov/servlets/purl/903314.
@article{osti_903314,
title = {SEARCH FOR IN-MEDIUM MODIFICATIONS OF THE ρ MESON},
author = {WEYGAND, D P and DJALALI, C and NASSERIPOUR, R and WOOD, M},
abstractNote = {The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, and here we present preliminary results. All three vector mesons, ρ, ω,and φ, are observed via their decay to e+e-, in order to reduce the effects of final state interactions in the nucleus. Of particular interest is possible in-medium effects on the properties of the ρ meson. The ρ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no effects on the mass of the ρ meson, however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.},
doi = {10.1142/S0217751X07035562},
journal = {Int.J.Mod.Phys.A},
number = ,
volume = 22,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

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