在质心能量√[S]=1.8 TeV的质子-质子碰撞中粲夸克偶素χ(c1)和χ(c2)的产生
Production of chi(c1) and chi(c2) in pp collisions at sqrt[S] = 1.8 TeV.
作者信息
Affolder T, Akimoto H, Akopian A, Albrow M G, Amaral P, Amendolia S R, Amidei D, Anikeev K, Antos J, Apollinari G, Arisawa T, Asakawa T, Ashmanskas W, Azfar F, Azzi-Bacchetta P, Bacchetta N, Bailey M W, Bailey S, de Barbaro P, Barbaro-Galtieri A, Barnes V E, Barnett B A, Baroiant S, Barone M, Bauer G, Bedeschi F, Belforte S, Bell W H, Bellettini G, Bellinger J, Benjamin D, Bensinger J, Beretvas A, Berge J P, Berryhill J, Bevensee B, Bhatti A, Binkley M, Bisello D, Bishai M, Blair R E, Blocker C, Bloom K, Blumenfeld B, Blusk S R, Bocci A, Bodek A, Bokhari W, Bolla G, Bonushkin Y, Bortoletto D, Boudreau J, Brandl A, van den Brink S, Bromberg C, Brozovic M, Bruner N, Buckley-Geer E, Budagov J, Budd H S, Burkett K, Busetto G, Byon-Wagner A, Byrum K L, Calafiura P, Campbell M, Carithers W, Carlson J, Carlsmith D, Caskey W, Cassada J, Castro A, Cauz D, Cerri A, Chan A W, Chang P S, Chang P T, Chapman J, Chen C, Chen Y C, Cheng M T, Chertok M, Chiarelli G, Chirikov-Zorin I, Chlachidze G, Chlebana F, Christofek L, Chu M L, Chung Y S, Ciobanu C I, Clark A G, Connolly A, Conway J, Cordelli M, Cranshaw J, Cronin-Hennessy D, Cropp R, Culbertson R, Dagenhart D, D'Auria S, DeJongh F, Dell'Agnello S, Dell'Orso M, Demortier L, Deninno M, Derwent P F, Devlin T, Dittmann J R, Donati S, Done J, Dorigo T, Eddy N, Einsweiler K, Elias J E, Engels E, Erbacher R, Errede D, Errede S, Fan Q, Feild R G, Fernandez J P, Ferretti C, Field R D, Fiori I, Flaugher B, Foster G W, Franklin M, Freeman J, Friedman J, Fukui Y, Furic I, Galeotti S, Gallinaro M, Gao T, Garcia-Sciveres M, Garfinkel A F, Gatti P, Gay C, Gerdes D W, Giannetti P, Giromini P, Glagolev V, Glenzinski D, Gold M, Goldstein J, Gordon A, Gorelov I, Goshaw A T, Gotra Y, Goulianos K, Green C, Grim G, Gris P, Groer L, Grosso-Pilcher C, Guenther M, Guillian G, Guimaraes da Costa J, Haas R M, Haber C, Hafen E, Hahn S R, Hall C, Handa T, Handler R, Hao W, Happacher F, Hara K, Hardman A D, Harris R M, Hartmann F, Hatakeyama K, Hauser J, Heinrich J, Heiss A, Herndon M, Hill C, Hoffman K D, Holck C, Hollebeek R, Holloway L, Hughes R, Huston J, Huth J, Ikeda H, Incandela J, Introzzi G, Iwai J, Iwata Y, James E, Jensen H, Jones M, Joshi U, Kambara H, Kamon T, Kaneko T, Karr K, Kasha H, Kato Y, Keaffaber T A, Kelley K, Kelly M, Kennedy R D, Kephart R, Khazins D, Kikuchi T, Kilminster B, Kim B J, Kim D H, Kim H S, Kim M J, Kim S H, Kim Y K, Kirby M, Kirk M, Kirsch L, Klimenko S, Koehn P, Köngeter A, Kondo K, Konigsberg J, Kordas K, Korn A, Korytov A, Kovacs E, Kroll J, Kruse M, Kuhlmann S E, Kurino K, Kuwabara T, Laasanen A T, Lai N, Lami S, Lammel S, Lamoureux J I, Lancaster J, Lancaster M, Lander R, Latino G, LeCompte T, Lee A M, Lee K, Leone S, Lewis J D, Lindgren M, Liss T M, Liu J B, Liu Y C, Lockyer N, Loken J, Loreti M, Lucchesi D, Lukens P, Lusin S, Lyons L, Lys J, Madrak R, Maeshima K, Maksimovic P, Malferrari L, Mangano M, Mariotti M, Martignon G, Martin A, Matthews J A, Mayer J, Mazzanti P, McFarland K S, McIntyre P, McKigney E, Menguzzato M, Menzione A, Mesropian C, Meyer A, Miao T, Miller R, Miller J S, Minato H, Miscetti S, Mishina M, Mitselmakher G, Moggi N, Moore E, Moore R, Morita Y, Moulik T, Mulhearn M, Mukherjee A, Muller T, Munar A, Murat P, Murgia S, Nachtman J, Nahn S, Nakada H, Nakaya T, Nakano I, Nelson C, Nelson T, Neu C, Neuberger D, Newman-Holmes C, Ngan C Y, Niu H, Nodulman L, Nomerotski A, Oh S H, Ohmoto T, Ohsugi T, Oishi R, Okusawa T, Olsen J, Orejudos W, Pagliarone C, Palmonari F, Paoletti R, Papadimitriou V, Pappas S P, Partos D, Patrick J, Pauletta G, Paulini M, Paus C, Pescara L, Phillips T J, Piacentino G, Pitts K T, Pompos A, Pondrom L, Pope G, Popovic M, Prokoshin F, Proudfoot J, Ptohos F, Pukhov O, Punzi G, Ragan K, Rakitine A, Reher D, Reichold A, Ribon A, Riegler W, Rimondi F, Ristori L, Riveline M, Robertson W J, Robinson A, Rodrigo T, Rolli S, Rosenson L, Roser R, Rossin R, Roy A, Safonov A, St Denis R, Sakumoto W K, Saltzberg D, Sanchez C, Sansoni A, Santi L, Sato H, Savard P, Schlabach P, Schmidt E E, Schmidt M P, Schmitt M, Scodellaro L, Scott A, Scribano A, Segler S, Seidel S, Seiya Y, Semenov A, Semeria F, Shah T, Shapiro M D, Shepard P F, Shibayama T, Shimojima M, Shochet M, Siegrist J, Signorelli G, Sill A, Sinervo P, Singh P, Slaughter A J, Sliwa K, Smith C, Snider F D, Solodsky A, Spalding J, Speer T, Sphicas P, Spinella F, Spiropulu M, Spiegel L, Steele J, Stefanini A, Strologas J, Strumia F, Stuart D, Sumorok K, Suzuki T, Takano T, Takashima R, Takikawa K, Tamburello P, Tanaka M, Tannenbaum B, Taylor W, Tecchio M, Tesarek R, Teng P K, Terashi K, Tether S, Thompson A S, Thurman-Keup R, Tipton P, Tkaczyk S, Tollefson K, Tollestrup A, Toyoda H, Trischuk W, de Troconiz J F, Tseng J, Turini N, Ukegawa F, Vaiciulis T, Valls J, Vejcik S, Velev G, Vidal R, Vilar R, Volobouev I, Vucinic D, Wagner R G, Wagner R L, Wahl J, Wallace N B, Walsh A M, Wang C, Wang M J, Watanabe T, Waters D, Watts T, Webb R, Wenzel H, Wester W C, Wicklund A B, Wicklund E, Wilkes T, Williams H H, Wilson P, Winer B L, Winn D, Wolbers S, Wolinski D, Wolinski J, Wolinski S, Worm S, Wu X, Wyss J, Yagil A, Yao W, Yeh G P, Yeh P, Yoh J, Yosef C, Yoshida T, Yu I, Yu S, Yu Z, Zanetti A, Zetti F, Zucchelli S
机构信息
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
出版信息
Phys Rev Lett. 2001 Apr 30;86(18):3963-8. doi: 10.1103/PhysRevLett.86.3963.
We have measured the ratio of prompt production rates of the charmonium states chi(c1) and chi(c2) in 110 pb(-1) of pp collisions at sqrt[s] = 1.8 TeV. The photon from their decay into J/psi(gamma) is reconstructed through conversion into e+e- pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma(chi(c2))/sigma(chi(c1)) = 0.96+/-0.27(stat)+/-0.11(syst) for events with pT(J/psi) > 4.0 GeV/c, /eta(J/psi)/ < 0.6, and pT(gamma) > 1.0 GeV/c.
我们测量了在质心能量(\sqrt{s}=1.8) TeV的质子-质子碰撞中，(110)皮靶（(pb^{-1})）下粲偶素态(\chi_{c1})和(\chi_{c2})的产生率之比。它们衰变成(J/\psi(\gamma))过程中产生的光子通过转化为正负电子对来重建。该技术提供的能量分辨率使得分辨这两个态成为可能。对于(p_T(J/\psi)>4.0) GeV/c、(\vert\eta(J/\psi)\vert<0.6)且(p_T(\gamma)>1.0) GeV/c的事件，我们发现产生截面之比(\sigma(\chi_{c2})/\sigma(\chi_{c1}) = 0.96\pm0.27)（统计误差）(\pm0.11)（系统误差）。
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