Hadronic resonance production in d+Au collisions at root S-NN = 200 GeV measured at the BNL Relativistic Heavy Ion Collider

0322605 - ÚJF 2009 RIV US eng J - Journal Article
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Hadronic resonance production in d+Au collisions at root S-NN = 200 GeV measured at the BNL Relativistic Heavy Ion Collider.
[Produkce hadronových rezonancí ve srážkách d+Au při S-NN = 200 GeV na RHIC.]
Physical Review. C. Roč. 78, č. 4 (2008), 044906/1-044906/20. ISSN 0556-2813
R&D Projects: GA ČR GA202/07/0079
Institutional research plan: CEZ:AV0Z10480505
Keywords : LARGE TRANSVERSE-MOMENTUM * ENERGY NUCLEAR COLLISIONS * TIME PROJECTION CHAMBER
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.124, year: 2008

We present the first measurements of the rho(770)(0),K-*(892),Delta(1232)(++),Sigma(1385), and Lambda(1520) resonances in d+Au collisions at <radical><radicand>s(NN)</radicand></radical>=200 GeV, reconstructed via their hadronic decay channels using the STAR detector (the solenoidal tracker at the BNL Relativistic Heavy Ion Collider). The masses and widths of these resonances are studied as a function of transverse momentum p(T). We observe that the resonance spectra follow a generalized scaling law with the transverse mass m(T). The p(T) of resonances in minimum bias collisions are compared with the p(T) of pi,K, and <overline>p</overline>. The rho(0)/pi(-),K-*/K-,Delta(++)/p,Sigma(1385)/Lambda, and Lambda(1520)/Lambda ratios in d+Au collisions are compared with the measurements in minimum bias p+p interactions, where we observe that both measurements are comparable.

Představujeme první měření ρ(770)0, K*(892), Δ(1232)++, Σ(1385), a Λ(1520) rezonancí ve srážkách d+Au při (sNN) = 200 GeV, rekonstruovaných přes jejich hadronové rozpadové kanály detektorem STAR na urychlovači RHIC. Hmoty a šířky rezonancí jsou studovány jako funkce příčné hybnosti (pT). Pozorujeme, že spektra rezonancí jsou v souladu se škálováním s příčnou hmotou (mT). pT rezonancí z minimálně biasovaných srážek je porovnáno s pT pro π, K a anti-p. Poměry ρ0/π-, K*/K-, Δ++/p, Σ(1385)/Λ a Λ(1520)/Λ ze srážek d+Au jsou porovnány s měřením z minimum bias p+p interakcí, zde pozorujeme, že obě měření jsou srovnatelné. Jaderné modifikační faktory (RdAu) pro ρ0, K* a Σ* jsou v souladu se škálováním s počtem binárních srážek (Nbin) pro pT > 1.2 GeV/c.
Permanent Link: http://hdl.handle.net/11104/0170807