Hadronic resonance production in d+Au collisions at s(NN)**(1/2) = 200-GeV at RHIC

Collaboration
Jan, 2008
21 pages
Published in:
  • Phys.Rev.C 78 (2008) 044906
e-Print:
Experiments:

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200820122016202020240246810
Abstract: (arXiv)
We present the first measurements of the ρ(770)0\rho(770)^0, KK^*(892), Δ\Delta(1232)++^{++}, Σ\Sigma(1385), and Λ\Lambda(1520) resonances in dd+Au collisions at sNN\sqrt{s_{_{NN}}} = 200 GeV, reconstructed via their hadronic decay channels using the STAR detector at RHIC. The masses and widths of these resonances are studied as a function of transverse momentum (pTp_T). We observe that the resonance spectra follow a generalized scaling law with the transverse mass (mTm_T). The <pT><p_T> of resonances in minimum bias collisions is compared to the <pT><p_T> of π\pi, KK, and pˉ\bar{p}. The ρ0/π\rho^0/\pi^-, K/KK^*/K^-, Δ++/p\Delta^{++}/p, Σ(1385)/Λ\Sigma(1385)/\Lambda, and Λ(1520)/Λ\Lambda(1520)/\Lambda ratios in dd+Au collisions are compared to the measurements in minimum bias p+pp+p interactions, where we observe that both measurements are comparable. The nuclear modification factors (RdAuR_{dAu}) of the ρ0\rho^0, KK^*, and Σ\Sigma^* scale with the number of binary collisions (NbinN_{bin}) for pT>p_T > 1.2 GeV/cc.
Note:
  • STAR Collaboration. Submitted to PRC
  • 13.75.Cs
  • 25.75.Dw
  • deuteron nucleus: colliding beams
  • scattering: heavy ion
  • gold
  • hadron: multiple production
  • resonance: hadroproduction
  • rho(770)0
  • K*(892)
  • Delta(1232)++