Suppressed $\pi^0$ Production at Large Transverse Momentum in Central Au + Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV
- Adler, S.S.
- Afanasiev, S.
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- Litvinenko, A.
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- Sullivan, J.P.
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- Velkovska, J.
- Velkovsky, M.
- Villatte, L.
- Vinogradov, A.A.
- Volkov, M.A.
- Vznuzdaev, E.
- Wang, X.R.
- Watanabe, Y.
- White, S.N.
- Wohn, F.K.
- Woody, C.L.
- Xie, W.
- Yang, Y.
- Yanovich, A.
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- Young, G.R.
- Yushmanov, I.E.
- Zajc, W.A.
- Zhang, C.
- Zhou, S.
- Zolin, L.
Publication date
January 2003
DOI Publisher
American Physical Society (APS)Abstract
Transverse momentum spectra of neutral pions in the range 1 < p_T < 10 GeV/c have been measured at mid-rapidity by the PHENIX experiment at RHIC in Au+Au collisions at sqrt(s_NN) = 200 GeV. The pi^0 multiplicity in central reactions is significantly below the yields measured at the same sqrt(s_NN) in peripheral Au+Au and p+p reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the suppression factor is ~2.5 at p_T = 2 GeV/c and increases to ~4-5 at p_T ~= 4 GeV/c. At larger p_T, the suppression remains constant within errors. The deficit is already apparent in semi-peripheral reactions and increases smoothly with centrality
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