rho^0 Production and Possible Modification in Au+Au and p+p Collisions at sqrt(s_NN) = 200 GeV

et al. (STAR Collaboration); J. Adams

arxiv: nucl-ex/0307023 · v2 · submitted 2003-07-28 · ⚛️ nucl-ex

rho⁰ Production and Possible Modification in Au+Au and p+p Collisions at sqrt(s_NN) = 200 GeV

J. Adams , et al. (STAR Collaboration) This is my paper

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keywords collisionsmassmodificationperipheralproductionsqrtbiasdependent

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We report results on rho(770)^0 -> pi+pi- production at midrapidity in p+p and peripheral Au+Au collisions at sqrt(s_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 ~40 MeV/c^2 in minimum bias p+p interactions and ~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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