Suppression of high-p{T} neutral pion production in central Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV relative to p+C and p+Pb collisions.

Aggarwal M M,Ahammed Z,Angelis A L S,Antonenko V,Arefiev V,Astakhov V,Avdeitchikov V,Awes T C,Baba P V K S,Badyal S K,Bathe S,Batiounia B,Baumann C,Bernier T,Bhalla K B,Bhatia V S,Blume C,Bucher D,Büsching H,Carlén L,Chattopadhyay S,Decowski M P,Delagrange H,Donni P,Majumdar M R Dutta,El Chenawi K,Dubey A K,Enosawa K,Fokin S,Frolov V,Ganti M S,Garpman S,Gavrishchuk O,Geurts F J M,Ghosh T K,Glasow R,Guskov B,Gustafsson H A,Gutbrod H H,Hrivnacova I,Ippolitov M,Kalechofsky H,Kamermans R,Karadjev K,Karpio K,Kolb B W,Kosarev I,Koutcheryaev I,Kugler A,Kulinich P,Kurata M,Lebedev A,Löhner H,Luquin L,Mahapatra D P,Manko V,Martin M,Martínez G,Maximov A,Miake Y,Mishra G C,Mohanty B, Mora M-J,Morrison D,Mukhanova T,Mukhopadhyay D S,Naef H,Nandi B K,Nayak S K,Nayak T K,Nianine A,Nikitine V,Nikolaev S,Nilsson P,Nishimura S,Nomokonov P,Nystrand J,Oskarsson A,Otterlund I,Pavliouk S,Peitzmann T,Peressounko D,Petracek V,Phatak S C,Pinganaud W,Plasil F,Purschke M L,Rak J,Rammler M,Raniwala R,Raniwala S,Rao N K,Retiere F,Reygers K,Roland G,Rosselet L,Roufanov I,Roy C,Rubio J M,Sambyal S S,Santo R,Sato S,Schlagheck H,Schmidt H-R,Schutz Y,Shabratova G,Shah T H,Sibiriak I,Siemiarczuk T,Silvermyr D,Sinha B C,Slavine N,Söderström K,Sood G,Sørensen S P,Stankus P,Stefanek G,Steinberg P,Stenlund E,Sumbera M,Svensson T,Tsvetkov A,Tykarski L,V D Pijll E C,V Eijndhoven N,V Nieuwenhuizen G J,Vinogradov A,Viyogi Y P,Vodopianov A,Vörös S,Wysłouch B,Young G R, Null Null

Physical review letters（2008）

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摘要

Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrt[S{NN}]=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal 3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.

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