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Strong evidence for ZZ production in pp¯ collisions at s=1.96 TeV

Aaltonen, T. et al. (2008) Strong evidence for ZZ production in pp¯ collisions at s=1.96 TeV. Physical Review Letters, 100 (20). ISSN 0031-9007 (doi:10.1103/PhysRevLett.100.201801)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.100.201801

Abstract

We report the first evidence of Z boson pair production at a hadron collider with a significance exceeding 4 standard deviations. This result is based on a data sample corresponding to 1.9  fb-1 of integrated luminosity from pp̅ collisions at √s=1.96  TeV collected with the Collider Detector at Fermilab II detector. In the ℓℓℓ′ℓ′ channel, we observe three ZZ candidates with an expected background of 0.096-0.063+0.092 events. In the ℓℓνν channel, we use a leading-order calculation of the relative ZZ and WW event probabilities to discriminate between signal and background. In the combination of ℓℓℓ′ℓ′ and ℓℓνν channels, we observe an excess of events with a probability of 5.1×10-6 to be due to the expected background. This corresponds to a significance of 4.4 standard deviations. The measured cross section is σ(pp̅ →ZZ)=1.4-0.6 +0.7 (stat+syst) pb, consistent with the standard model expectation.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Robson, Dr Aidan and St Denis, Dr Richard and Bussey, Dr Peter
Authors: Aaltonen, T., Adelman, J., Akimoto, T., Albrow, M., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Apresyan, A., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzi-Bacchetta, P., Azzurri, P., Bacchetta, N., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., Baroiant, S., Bartsch, V., Bauer, G., Beauchemin, P.-H., Bedeschi, F., Bednar, P., Behari, S., Bellettini, G., Bellinger, J., Belloni, A., Benjamin, D., Beretvas, A., Beringer, J., Berry, T., Bhatti, A., Binkley, M., Bisello, D., Bizjak, I., Blair, R., Blocker, C., Blumenfeld, B., Bocci, A., Bodek, A., Boisvert, V., Bolla, G., Bolshov, A., Bortoletto, D., Boudreau, J., Boveia, A., Brau, B., Bridgeman, A., Brigliadori, L., Bromberg, C., Brubaker, E., Budagov, J., Budd, H., Budd, S., Burkett, K., Busetto, G., Bussey, P., Buzatu, A., Byrum, K., Cabrera, S., Campanelli, M., Campbell, M., Canelli, F., Canepa, A., Carlsmith, D., Carosi, R., Carrillo, S., Carron, S., Casal, B., Casarsa, M., Castro, A., Catastini, P., Cauz, D., Cavalli-Sforza, M., Cerri, A., Cerrito, L., Chang, S., Chen, Y., Chertok, M., Chiarelli, G., Chlachidze, G., Chlebana, F., Cho, K., Chokheli, D., Chou, J., Choudalakis, G., Chuang, S., Chung, K., Chung, W., Chung, Y., Ciobanu, C., Ciocci, M., Clark, A., Clark, D., Compostella, G., Convery, M., Conway, J., Cooper, B., Copic, K., Cordelli, M., Cortiana, G., Crescioli, F., Cuenca Almenar, C., Cuevas, J., Culbertson, R., Cully, J., Dagenhart, D., Datta, M., Davies, T., de Barbaro, P., De Cecco, S., Deisher, A., De Lentdecker, G., De Lorenzo, G., Dell’Orso, M., Demortier, L., Deng, J., Deninno, M., De Pedis, D., Derwent, P., Di Giovanni, G., Dionisi, C., Di Ruzza, B., Dittmann, J., D’Onofrio, M., Donati, S., Dong, P., Donini, J., Dorigo, T., Dube, S., Efron, J., Erbacher, R., Errede, D., Errede, S., Eusebi, R., Fang, H., Farrington, S., Fedorko, W., Feild, R., Feindt, M., Fernandez, J., Ferrazza, C., Field, R., Flanagan, G., Forrest, R., Forrester, S., Franklin, M., Freeman, J., Furic, I., Gallinaro, M., Galyardt, J., Garberson, F., Garcia, J., Garfinkel, A., Genser, K., Gerberich, H., Gerdes, D., Giagu, S., Giakoumopolou, V., Giannetti, P., Gibson, K., Gimmell, J., Ginsburg, C., Giokaris, N., Giordani, M., Giromini, P., Giunta, M., Glagolev, V., Glenzinski, D., Gold, M., Goldschmidt, N., Golossanov, A., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González, O., Gorelov, I., Goshaw, A., Goulianos, K., Gresele, A., Grinstein, S., Grosso-Pilcher, C., Group, R., Grundler, U., Guimaraes da Costa, J., Gunay-Unalan, Z., Haber, C., Hahn, K., Hahn, S., Halkiadakis, E., Hamilton, A., Han, B.-Y., Han, J., Handler, R., Happacher, F., Hara, K., Hare, D., Hare, M., Harper, S., Harr, R., Harris, R., Hartz, M., Hatakeyama, K., Hauser, J., Hays, C., Heck, M., Heijboer, A., Heinemann, B., Heinrich, J., Henderson, C., Herndon, M., Heuser, J., Hewamanage, S., Hidas, D., Hill, C., Hirschbuehl, D., Hocker, A., Hou, S., Houlden, M., Hsu, S.-C., Huffman, B., Hughes, R., Husemann, U., Huston, J., Incandela, J., Introzzi, G., Iori, M., Ivanov, A., Iyutin, B., James, E., Jayatilaka, B., Jeans, D., Jeon, E., Jindariani, S., Johnson, W., Jones, M., Joo, K., Jun, S., Jung, J., Junk, T., Kamon, T., Kar, D., Karchin, P., Kato, Y., Kephart, R., Kerzel, U., Khotilovich, V., Kilminster, B., Kim, D., Kim, H., Kim, J., Kim, M., Kim, S., Kim, S., Kim, Y., Kimura, N., Kirsch, L., Klimenko, S., Klute, M., Knuteson, B., Ko, B., Koay, S., Kondo, K., Kong, D., Konigsberg, J., Korytov, A., Kotwal, A., Kraus, J., Kreps, M., Kroll, J., Krumnack, N., Kruse, M., Krutelyov, V., Kubo, T., Kuhlmann, S., Kuhr, T., Kulkarni, N., Kusakabe, Y., Kwang, S., Laasanen, A., Lai, S., Lami, S., Lammel, S., Lancaster, M., Lander, R., Lannon, K., Lath, A., Latino, G., Lazzizzera, I., LeCompte, T., Lee, J., Lee, J., Lee, Y., Lee, S., Lefèvre, R., Leonardo, N., Leone, S., Levy, S., Lewis, J., Lin, C., Lin, C., Linacre, J., Lindgren, M., Lipeles, E., Lister, A., Litvintsev, D., Liu, T., Lockyer, N., Loginov, A., Loreti, M., Lovas, L., Lu, R.-S., Lucchesi, D., Lueck, J., Luci, C., Lujan, P., Lukens, P., Lungu, G., Lyons, L., Lys, J., Lysak, R., Lytken, E., Mack, P., MacQueen, D., Madrak, R., Maeshima, K., Makhoul, K., Maki, T., Maksimovic, P., Malde, S., Malik, S., Manca, G., Manousakis, A., Margaroli, F., Marino, C., Marino, C., Martin, A., Martin, M., Martin, V., Martínez, M., Martínez-Ballarín, R., Maruyama, T., Mastrandrea, P., Masubuchi, T., Mattson, M., Mazzanti, P., McFarland, K., McIntyre, P., McNulty, R., Mehta, A., Mehtala, P., Menzemer, S., Menzione, A., Merkel, P., Mesropian, C., Messina, A., Miao, T., Miladinovic, N., Miles, J., Miller, R., Mills, C., Milnik, M., Mitra, A., Mitselmakher, G., Miyake, H., Moed, S., Moggi, N., Moon, C., Moore, R., Morello, M., Movilla Fernandez, P., Mülmenstädt, J., Mukherjee, A., Muller, Th., Mumford, R., Murat, P., Mussini, M., Nachtman, J., Nagai, Y., Nagano, A., Naganoma, J., Nakamura, K., Nakano, I., Napier, A., Necula, V., Neu, C., Neubauer, M., Nielsen, J., Nodulman, L., Norman, M., Norniella, O., Nurse, E., Oh, S., Oh, Y., Oksuzian, I., Okusawa, T., Oldeman, R., Orava, R., Osterberg, K., Pagan Griso, S., Pagliarone, C., Palencia, E., Papadimitriou, V., Papaikonomou, A., Paramonov, A., Parks, B., Pashapour, S., Patrick, J., Pauletta, G., Paulini, M., Paus, C., Pellett, D., Penzo, A., Phillips, T., Piacentino, G., Piedra, J., Pinera, L., Pitts, K., Plager, C., Pondrom, L., Portell, X., Poukhov, O., Pounder, N., Prakoshyn, F., Pronko, A., Proudfoot, J., Ptohos, F., Punzi, G., Pursley, J., Rademacker, J., Rahaman, A., Ramakrishnan, V., Ranjan, N., Redondo, I., Reisert, B., Rekovic, V., Renton, P., Rescigno, M., Richter, S., Rimondi, F., Ristori, L., Robson, A., Rodrigo, T., Rogers, E., Rolli, S., Roser, R., Rossi, M., Rossin, R., Roy, P., Ruiz, A., Russ, J., Rusu, V., Saarikko, H., Safonov, A., Sakumoto, W., Salamanna, G., Saltó, O., Santi, L., Sarkar, S., Sartori, L., Sato, K., Savoy-Navarro, A., Scheidle, T., Schlabach, P., Schmidt, E., Schmidt, M., Schmidt, M., Schmitt, M., Schwarz, T., Scodellaro, L., Scott, A., Scribano, A., Scuri, F., Sedov, A., Seidel, S., Seiya, Y., Semenov, A., Sexton-Kennedy, L., Sfyrla, A., Shalhout, S., Shapiro, M., Shears, T., Shepard, P., Sherman, D., Shimojima, M., Shochet, M., Shon, Y., Shreyber, I., Sidoti, A., Sinervo, P., Sisakyan, A., Slaughter, A., Slaunwhite, J., Sliwa, K., Smith, J., Snider, F., Snihur, R., Soderberg, M., Soha, A., Somalwar, S., Sorin, V., Spalding, J., Spinella, F., Spreitzer, T., Squillacioti, P., Stanitzki, M., St Denis, R., Stelzer, B., Stelzer-Chilton, O., Stentz, D., Strologas, J., Stuart, D., Suh, J., Sukhanov, A., Sun, H., Suslov, I., Suzuki, T., Taffard, A., Takashima, R., Takeuchi, Y., Tanaka, R., Tecchio, M., Teng, P., Terashi, K., Thom, J., Thompson, A., Thompson, G., Thomson, E., Tipton, P., Tiwari, V., Tkaczyk, S., Toback, D., Tokar, S., Tollefson, K., Tomura, T., Tonelli, D., Torre, S., Torretta, D., Tourneur, S., Trischuk, W., Tu, Y., Turini, N., Ukegawa, F., Uozumi, S., Vallecorsa, S., van Remortel, N., Varganov, A., Vataga, E., Vázquez, F., Velev, G., Vellidis, C., Veszpremi, V., Vidal, M., Vidal, R., Vila, I., Vilar, R., Vine, T., Vogel, M., Volobouev, I., Volpi, G., Würthwein, F., Wagner, P., Wagner, R., Wagner, R., Wagner-Kuhr, J., Wagner, W., Wakisaka, T., Wallny, R., Wang, S., Warburton, A., Waters, D., Weinberger, M., Wester, W., Whitehouse, B., Whiteson, D., Wicklund, A., Wicklund, E., Williams, G., Williams, H., Wilson, P., Winer, B., Wittich, P., Wolbers, S., Wolfe, C., Wright, T., Wu, X., Wynne, S., Yagil, A., Yamamoto, K., Yamaoka, J., Yamashita, T., Yang, C., Yang, U., Yang, Y., Yao, W., Yeh, G., Yoh, J., Yorita, K., Yoshida, T., Yu, G., Yu, I., Yu, S., Yun, J., Zanello, L., Zanetti, A., Zaw, I., Zhang, X., Zheng, Y., and Zucchelli, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
395963Experimental Particle PhysicsAnthony DoyleScience & Technologies Facilities Council (STFC)ST/H001077/1Physics and Astronomy