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SUMMARY:Low mass dimuon production in proton-nucleus collisions at $\\sqrt
 {s} = 27.5$~GeV with the NA60 experiment
DTSTART;VALUE=DATE-TIME:20110527T155000Z
DTEND;VALUE=DATE-TIME:20110527T161000Z
DTSTAMP;VALUE=DATE-TIME:20130521T075735Z
UID:indico-contribution-536@cern.ch
DESCRIPTION:Speakers: Dr. URAS\, Antonio (INFN Cagliari\, IPNL Lyon)\nThe 
 study of the production of low mass vector and pseudoscalar mesons in prot
 on-nucleus collisions represents a natural baseline for the heavy-ion obse
 rvations\, allowing to provide a reference in an environment of cold nucle
 ar matter. In-medium modifications of the vector meson spectral functions 
 were actually predicted to occur also in cold nuclear matter\, though the 
 experimental evidence at the moment is controversial. Proton-nucleus colli
 sions also give access to the study of strangeness production as a functio
 n of the size of the nucleus\, providing a robust ground for strangeness e
 nhancement in nuclear collisions. Besides that\, the study of the nuclear 
 dependence of particle properties in proton-nucleus collisions\, as the tr
 ansverse momentum spectra and the production cross sections\, is an effect
 ive tool to understand the dynamics of soft hadron interactions.\n\nThe NA
 60 experiment has collected an unprecedented statistics of 180000 low mass
  muon pairs in proton-nucleus data at $\\sqrt{s} = 27.5$~GeV exposing to t
 he beam six target materials: Be\, Cu\, In\, W\, Pb and~U. The very good s
 tatistical accuracy and dimuon mass resolution allowed us to perform a pre
 cision measurement of the $\\rho$ line shape related the $T$ parameter of 
 the Boltzmann factor\, which was measured for the first time in p-A collis
 ions. The $\\rho-\\omega$ interference was also investigated and prelimina
 ry results are reported. No evidence of in-medium effects is found. In add
 ition\, the electromagnetic transition form factors of the $\\eta$ and $\\
 omega$ mesons were also measured\, with a significant precision improvemen
 t with respect to the previous measurements. The $\\omega$ results\, compa
 red to the latest theoretical developments\, still show the presence of an
  anomaly which is not described by theory. For the $\\omega$ and $\\phi$ m
 esons\, thanks to the good acceptance coverage\, the transverse momentum s
 pectra were measured down to zero $\\pt$. Finally\, the nuclear dependence
  of the production cross sections was investigated in terms of the power l
 aw $\\sigma_\\mathrm{pA} \\propto \\mathrm{A}^\\alpha$\, and  the $\\alpha
 $ parameter was studied as a function of $\\pt$.\n\nhttp://indico.cern.ch/
 contributionDisplay.py?contribId=536&sessionId=76&confId=30248
LOCATION:Imperial Palace Salon Haendel AB
URL:http://indico.cern.ch/contributionDisplay.py?contribId=536&sessionId=7
 6&confId=30248
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