Measurement of the W→eν and Z/γ *→e +e - production cross sections at mid-rapidity in proton-proton collisions at √s=500GeV

Adamczyk, Agakishiev, Aggarwal, Ahammed, Alakhverdyants, Alekseev, Alford, Anderson, Anson, Arkhipkin, Aschenauer, Averichev, Balewski, Banerjee, Barnovska, Beavis, Bellwied, Betancourt, Betts, Bhasin, Bhati, Bichsel, Bielcik, Bielcikova, Bland, Bordyuzhin, Borowski, Bouchet, Brandin, Brovko, Bruna, Bueltmann, Bunzarov, Burton, Butterworth, Cai, Caines, Calderón De La Barca Sánchez, Cebra, Cendejas, Cervantes, Chaloupka, Chattopadhyay, Chen, Cheng, Cherney, Chikanian, Christie, Chung, Chwastowski, Codrington, Corliss, Cramer, Crawford, Cui, Davila Leyva, De Silva, Debbe, Dedovich, Deng, Derradi De Souza, Dhamija, Didenko, Ding, Dion, Djawotho, Dong, Drachenberg, Draper, Du, Dunkelberger, Dunlop, Efimov, Elnimr, Engelage, Eppley, Eun, Evdokimov, Fatemi, Fazio, Fedorisin, Fersch, Filip, Finch, Fisyak, Gagliardi, Gangadharan, Geurts, Gliske, Gorbunov, Grebenyuk, Grosnick, Gupta, Guryn, Haag, Hajkova, Hamed, Han, Harris, Hays-Wehle, Heppelmann, Hirsch, Hoffmann, Hofman, Horvat, Huang, Huck, Humanic, Huo, Igo, Jacobs, Jena, Joseph, Judd, Kabana, Kang, Kapitan, Kauder, Ke, Keane, Kechechyan, Kesich, Kettler, Kikola, Kiryluk, Kisiel, Kizka, Klein, Koetke, Kollegger, Konzer, Koralt, Koroleva, Korsch, Kotchenda, Kravtsov, Krueger, Kumar, Lamont, Landgraf, Lapointe, Lauret, Lebedev, Lednicky, Lee, Leight, Levine, Li, Lima, Lisa, Liu, Ljubicic, Llope, Longacre, Lu, Luo, Luszczak, Ma, Mahapatra, Majka, Mall, Margetis, Markert, Masui, Matis, McDonald, McShane, Mioduszewski, Mitrovski, Mohammed, Mohanty, Morozov, Munhoz, Mustafa, Naglis, Nandi, Nasim, Nayak, Nogach, Odyniec, Ogawa, Oh, Ohlson, Okorokov, Oldag, Oliveira, Olson, Ostrowski, Pachr, Page, Pal, Pan, Pandit, Panebratsev, Pawlak, Pawlik, Pei, Perkins, Peryt, Pile, Planinic, Pluta, Plyku, Poljak, Porter, Poskanzer, Powell, Prindle, Pruneau, Pruthi, Przybycien, Pujahari, Putschke, Qiu, Raniwala, Ray, Redwine, Reed, Riley, Ritter, Roberts, Rogachevskiy, Romero, Ruan, Rusnak, Sahoo, Sakrejda, Salur, Sandacz, Sandweiss, Sangaline, Sarkar, Schambach, Scharenberg, Schmah, Schmidke, Schmitz, Schuster, Seele, Seger, Seyboth, Shah, Shahaliev, Shao, Sharma, Shi, Shou, Sichtermann, Singaraju, Skoby, Smirnov, Solanki, Sorensen, Desouza, Spinka, Srivastava, Stanislaus, Steadman, Stevens, Stock, Strikhanov, Stringfellow, Suaide, Suarez, Sumbera, Sun, Surrow, Svirida, Symons, Szanto De Toledo, Takahashi, Tang, Tarini, Tarnowsky, Thein, Thomas, Tian, Timmins, Tlusty, Tokarev, Trainor, Trentalange, Tribble, Tribedy, Trzeciak, Tsai, Turnau, Ullrich, Underwood, Van Buren, Van Nieuwenhuizen, Vanfossen, Varma, Vasconcelos, Videbæk, Viyogi, Vokal, Voloshin, Vossen, Wada, Wang, Webb, Westfall, Whitten, Wieman, Wissink, Witt, Witzke, Wu, Xiao, Xie, Xin, Xu, Xue, Yang, Yepes, Yi, Yip, Yoo, Zawisza, Zbroszczyk, Zhang, Zhao, Zhong, Zhu, Zoulkarneeva

PHYSICAL REVIEW D（2012）

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摘要

We report measurements of the charge-separated W+(-)-> e(+(-))+nu(e)(nu-(e)) and Z/gamma*-> e(+)e(-) production cross sections at mid-rapidity in proton-proton collisions at root s=500 GeV. These results are based on 13.2 pb(-1) of data recorded in 2009 by the STAR detector at RHIC. Production cross sections for W bosons that decay via the e nu channel were measured to be sigma(pp -> W+X)center dot BR(W+-> e(+)nu e)=117.3 +/- 5.9(stat)+/- 6.2(syst)+/- 15.2(lumi) pb, and sigma(pp -> W-X)center dot BR(W--> e(-)(nu)over bar(-)e)=43.3 +/- 4.6(stat)+/- 3.4(syst)+/- 5.6(lumi) pb. For Z/gamma* production, sigma(pp -> Z/gamma*X)center dot BR(Z/gamma*-> e(+)e(-))=7.7 +/- 2.1(stat)-0.9+0.5(syst)+/- 1.0(lumi) pb was measured for di-lepton invariant masses m(e+e-) between 70 and 110 GeV/c(2). First measurements of the W cross section ratio, sigma(pp -> W+X)/sigma(pp -> W-X), at root v=500 GeV are also reported. Theoretical predictions, calculated using recent parton distribution functions, are found to agree with the measured cross sections.

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