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Rho0 production and possible modification in Au+Au and p+p collisions at square root [sNN] = 200 GeV |
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| Authors: | Adams J Adler C Aggarwal M M Ahammed Z Amonett J Anderson B D Arkhipkin D Averichev G S Badyal S K Balewski J Barannikova O Barnby L S Baudot J Bekele S Belaga V V Bellwied R Berger J Bezverkhny B I Bhardwaj S Bhati A K Bichsel H Billmeier A Bland L C Blyth C O Bonner B E Botje M Boucham A Brandin A Bravar A Cadman R V Cai X Z Caines H Calderón de la Barca Sánchez M Carroll J Castillo J Cebra D Chaloupka P Chattopadhyay S Chen H F Chen Y Chernenko S P Cherney M Chikanian A Christie W Coffin J P Cormier T M Cramer J G Crawford H J Das D Das S Derevschikov A A Didenko L Dietel T Dong W J Dong X |
| Institution: | University of Birmingham, Birmingham, United Kingdom. |
| Abstract: | We report results on rho(770)(0)-->pi(+)pi(-) production at midrapidity in p+p and peripheral Au+Au collisions at sqrts(NN)]=200 GeV. This is the first direct measurement of rho(770)(0)-->pi(+)pi(-) in heavy-ion collisions. The measured rho(0) peak in the invariant mass distribution is shifted by approximately 40 MeV/c(2) in minimum bias p+p interactions and approximately 70 MeV/c(2) in peripheral Au+Au collisions. The rho(0) mass shift is dependent on transverse momentum and multiplicity. The modification of the rho(0) meson mass, width, and shape due to phase space and dynamical effects are discussed. |
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