通过对√[s(NN)] = 200 GeV的金离子与金离子碰撞中单电子的测量研究粲夸克产生的中心度依赖性。
Centrality dependence of charm production from a measurement of single electrons in Au+Au collisions at sqrt[s(NN)]=200 GeV.
作者信息
Adler S S, Afanasiev S, Aidala C, Ajitanand N N, Akiba Y, Alexander J, Amirikas R, Aphecetche L, Aronson S H, Averbeck R, Awes T C, Azmoun R, Babintsev V, Baldisseri A, Barish K N, Barnes P D, Bassalleck B, Bathe S, Batsouli S, Baublis V, Bazilevsky A, Belikov S, Berdnikov Y, Bhagavatula S, Boissevain J G, Borel H, Borenstein S, Brooks M L, Brown D S, Bruner N, Bucher D, Buesching H, Bumazhnov V, Bunce G, Burward-Hoy J M, Butsyk S, Camard X, Chai J-S, Chand P, Chang W C, Chernichenko S, Chi C Y, Chiba J, Chiu M, Choi I J, Choi J, Choudhury R K, Chujo T, Cianciolo V, Cobigo Y, Cole B A, Constantin P, d'Enterria D G, David G, Delagrange H, Denisov A, Deshpande A, Desmond E J, Devismes A, Dietzsch O, Drapier O, Drees A, du Rietz R, Durum A, Dutta D, Efremenko Y V, El Chenawi K, Enokizono A, En'yo H, Esumi S, Ewell L, Fields D E, Fleuret F, Fokin S L, Fox B D, Fraenkel Z, Frantz J E, Franz A, Frawley A D, Fung S-Y, Garpman S, Ghosh T K, Glenn A, Gogiberidze G, Gonin M, Gosset J, Goto Y, Granier de Cassagnac R, Grau N, Greene S V, Grosse Perdekamp M, Guryn W, Gustafsson H-A, Hachiya T, Haggerty J S, Hamagaki H, Hansen A G, Hartouni E P, Harvey M, Hayano R, Hayashi N, He X, Heffner M, Hemmick T K, Heuser J M, Hibino M, Hill J C, Holzmann W, Homma K, Hong B, Hoover A, Ichihara T, Ikonnikov V V, Imai K, Isenhower D, Ishihara M, Issah M, Isupov A, Jacak B V, Jang W Y, Jeong Y, Jia J, Jinnouchi O, Johnson B M, Johnson S C, Joo K S, Jouan D, Kametani S, Kamihara N, Kang J H, Kapoor S S, Katou K, Kelly S, Khachaturov B, Khanzadeev A, Kikuchi J, Kim D H, Kim D J, Kim D W, Kim E, Kim G-B, Kim H J, Kistenev E, Kiyomichi A, Kiyoyama K, Klein-Boesing C, Kobayashi H, Kochenda L, Kochetkov V, Koehler D, Kohama T, Kopytine M, Kotchetkov D, Kozlov A, Kroon P J, Kuberg C H, Kurita K, Kuroki Y, Kweon M J, Kwon Y, Kyle G S, Lacey R, Ladygin V, Lajoie J G, Lebedev A, Leckey S, Lee D M, Lee S, Leitch M J, Li X H, Lim H, Litvinenko A, Liu M X, Liu Y, Maguire C F, Makdisi Y I, Malakhov A, Manko V I, Mao Y, Martinez G, Marx M D, Masui H, Matathias F, Matsumoto T, McGaughey P L, Melnikov E, Messer F, Miake Y, Milan J, Miller T E, Milov A, Mioduszewski S, Mischke R E, Mishra G C, Mitchell J T, Mohanty A K, Morrison D P, Moss J M, Mühlbacher F, Mukhopadhyay D, Muniruzzaman M, Murata J, Nagamiya S, Nagle J L, Nakamura T, Nandi B K, Nara M, Newby J, Nilsson P, Nyanin A S, Nystrand J, O'Brien E, Ogilvie C A, Ohnishi H, Ojha I D, Okada K, Ono M, Onuchin V, Oskarsson A, Otterlund I, Oyama K, Ozawa K, Pal D, Palounek A P T, Pantuev V S, Papavassiliou V, Park J, Parmar A, Pate S F, Peitzmann T, Peng J-C, Peresedov V, Pinkenburg C, Pisani R P, Plasil F, Purschke M L, Purwar A K, Rak J, Ravinovich I, Read K F, Reuter M, Reygers K, Riabov V, Riabov Y, Roche G, Romana A, Rosati M, Rosnet P, Ryu S S, Sadler M E, Saito N, Sakaguchi T, Sakai M, Sakai S, Samsonov V, Sanfratello L, Santo R, Sato H D, Sato S, Sawada S, Schutz Y, Semenov V, Seto R, Shaw M R, Shea T K, Shibata T-A, Shigaki K, Shiina T, Silva C L, Silvermyr D, Sim K S, Singh C P, Singh V, Sivertz M, Soldatov A, Soltz R A, Sondheim W E, Sorensen S P, Sourikova I V, Staley F, Stankus P W, Stenlund E, Stepanov M, Ster A, Stoll S P, Sugitate T, Sullivan J P, Takagui E M, Taketani A, Tamai M, Tanaka K H, Tanaka Y, Tanida K, Tannenbaum M J, Tarján P, Tepe J D, Thomas T L, Tojo J, Torii H, Towell R S, Tserruya I, Tsuruoka H, Tuli S K, Tydesjö H, Tyurin N, van Hecke H W, Velkovska J, Velkovsky M, Veszprémi V, 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, Yokkaichi S, Young G R, Yushmanov I E, Zajc W A, Zhang C, Zhou S, Zhou S J, Zolin L
机构信息
Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
出版信息
Phys Rev Lett. 2005 Mar 4;94(8):082301. doi: 10.1103/PhysRevLett.94.082301. Epub 2005 Mar 2.
The PHENIX experiment has measured midrapidity transverse momentum spectra (0.4<p(T)<4.0 GeV/c) of single electrons as a function of centrality in Au+Au collisions at sqrt[s(NN)]=200 GeV. Contributions from photon conversions and Dalitz decays of light neutral mesons are measured by introducing a thin (1.7% X0) converter into the PHENIX acceptance and are statistically removed. The subtracted nonphotonic electron spectra are primarily due to the semileptonic decays of hadrons containing heavy quarks, mainly charm at lower p(T). For all centralities, the charm production cross section is found to scale with the nuclear overlap function, T(AA). For minimum-bias collisions the charm cross section per binary collision is N(cc )/T(AA)=622+/-57(stat)+/-160(syst) microb.
相对论重离子对撞机（PHENIX）实验测量了在质心能量(\sqrt{s(NN)} = 200) GeV的金金碰撞中，单电子的中快度横向动量谱（(0.4 < p(T) < 4.0) GeV/c）作为中心度的函数。通过在PHENIX接受度内引入一个薄的（1.7% (X_0)）转换体来测量光子转换和轻中性介子的达利兹衰变的贡献，并在统计上予以扣除。减去后的非光子电子谱主要源于含重夸克强子的半轻子衰变，在较低的(p(T))时主要是粲夸克。对于所有中心度，发现粲夸克产生截面与核重叠函数(T(AA))成比例。对于最小无偏碰撞，每一次二元碰撞的粲夸克截面为(N(cc)/T(AA) = 622 ± 57)（统计）(± 160)（系统）微靶恩。
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