Measurement of the top-quark mass with dilepton events selected using neuroevolution at CDF

We report a measurement of the top-quark mass Mt in the dilepton decay channel tt̄→bl′+νl′b̄l-ν̄l. Events are selected with a neural network which has been directly optimized for statistical precision in top-quark mass using neuroevolution, a technique modeled on biological evolution. The top-quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0fb-1 of pp̄ collisions collected with the CDF II detector, yielding a measurement of Mt=171.2±2.7(stat)±2.9(syst)GeV/c2. © 2009 The American Physical Society

Direct Bound on the Total Decay Width of the Top Quark in p(p)over-bar Collisions at root s=1.96 TeV

We present the first direct experimental bound on the total decay width of the top quark, Gamma(t), using 955 pb(-1) of the Tevatron's p (p) over bar collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood-ratio ordering, we extract an upper limit at 95\% C.L. of Gamma(t) < 13.1 GeV for an assumed top quark mass of 175 GeV/c(2)

Measurement of the fraction of tt¯ production via gluon-gluon fusion in pp¯ collisions at √s = 1.96 TeV

Aaltonen, T., Adelman, J., Akimoto, T., Albrow, M.G., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Apresyan, A., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzurri, P., Badgett, W., Barbaro-Galtieri, A., Barnes, V.E., Barnett, B.A., Bartsch, V., Bauer, G., Beauchemin, P.-H., Bedeschi, F., Bednar, P., Beecher, D., Behari, S., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Beringer, J., Bhatti, A., Binkley, M., Bisello, D., Bizjak, I., Blair, R.E., Blocker, C., Blumenfeld, B., Bocci, A., Bodek, A., Boisvert, V., Bolla, G., Bortoletto, D., Boudreau, J., Boveia, A., Brau, B., Bridgeman, A., Brigliadori, L., Bromberg, C., Brubaker, E., Budagov, J., Budd, H.S., Budd, S., Burkett, K., Busetto, G., Bussey, P., Buzatu, A., Byrum, K.L., Cabrera, S., Calancha, C., 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., Cavaliere, V., Cavalli-Sforza, M., Cerri, A., Cerrito, L., Chang, S.H., Chen, Y.C., Chertok, M., Chiarelli, G., Chlachidze, G., Chlebana, F., Cho, K., Chokheli, D., Chou, J.P., Choudalakis, G., Chuang, S.H., Chung, K., Chung, W.H., Chung, Y.S., Ciobanu, C.I., Ciocci, M.A., Clark, A., Clark, D., Compostella, G., Convery, M.E., Conway, J., Copic, K., Cordelli, M., Cortiana, G., Cox, D.J., Crescioli, F., Cuenca Almenar, C., Cuevas, J., Culbertson, R., Cully, J.C., Dagenhart, D., Datta, M., Davies, T., De Barbaro, P., De Cecco, S., Deisher, A., De Lorenzo, G., Dell'Orso, M., Deluca, C., Demortier, L., Deng, J., Deninno, M., Derwent, P.F., Di Giovanni, G.P., Dionisi, C., Di Ruzza, B., Dittmann, J.R., D'Onofrio, M., Donati, S., Dong, P., Donini, J., Dorigo, T., Dube, S., Efron, J., Elagin, A., Erbacher, R., Errede, D., Errede, S., Eusebi, R., Fang, H.C., Farrington, S., Fedorko, W.T., Feild, R.G., Feindt, M., Fernandez, J.P., Ferrazza, C., Field, R., Flanagan, G., Forrest, R., Franklin, M., Freeman, J.C., Furic, I., Gallinaro, M., Galyardt, J., Garberson, F., Garcia, J.E., Garfinkel, A.F., Genser, K., Gerberich, H., Gerdes, D., Gessler, A., Giagu, S., Giakoumopoulou, V., Giannetti, P., Gibson, K., Gimmell, J.L., Ginsburg, C.M., Giokaris, N., Giordani, M., Giromini, P., Giunta, M., Giurgiu, G., Glagolev, V., Glenzinski, D., Gold, M., Goldschmidt, N., Golossanov, A., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González, O., Gorelov, I., Goshaw, A.T., Goulianos, K., Gresele, A., Grinstein, S., Grosso-Pilcher, C., Group, R.C., Grundler, U., Guimaraes Da Costa, J., Gunay-Unalan, Z., Haber, C., Hahn, K., Hahn, S.R., Halkiadakis, E., Han, B.-Y., Han, J.Y., Handler, R., Happacher, F., Hara, K., Hare, D., Hare, M., Harper, S., Harr, R.F., Harris, R.M., 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.S., 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Lister, A., Litvintsev, D.O., Liu, C., Liu, T., Lockyer, N.S., 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-Katsikakis, A., Margaroli, F., Marino, C., Marino, C.P., Martin, A., Martin, V., Martínez, M., Martínez-Ballarín, R., Maruyama, T., Mastrandrea, P., Masubuchi, T., Mattson, M.E., Mazzanti, P., McFarland, K.S., McIntyre, P., McNulty, R., Mehta, A., Mehtala, P., Menzione, A., Merkel, P., Mesropian, C., Miao, T., Miladinovic, N., Miller, R., Mills, C., Milnik, M., Mitra, A., Mitselmakher, G., Miyake, H., Moggi, N., Moon, C.S., Moore, R., Morello, M.J., Morlok, J., Movilla Fernandez, P., Mülmenstädt, J., Mukherjee, A., Muller, T., Mumford, R., Murat, P., Mussini, M., Nachtman, J., Nagai, Y., Nagano, A., Naganoma, J., Nakamura, K., Nakano, 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L., Sato, K., Savoy-Navarro, A., Scheidle, T., Schlabach, P., Schmidt, A., Schmidt, E.E., Schmidt, M.A., Schmidt, M.P., Schmitt, M., Schwarz, T., Scodellaro, L., Scott, A.L., Scribano, A., Scuri, F., Sedov, A., Seidel, S., Seiya, Y., Semenov, A., Sexton-Kennedy, L., Sfyrla, A., Shalhout, S.Z., Shears, T., Shepard, P.F., Sherman, D., Shimojima, M., Shiraishi, S., Shochet, M., Shon, Y., Shreyber, I., Sidoti, A., Sinervo, P., Sisakyan, A., Slaughter, A.J., Slaunwhite, J., Sliwa, K., Smith, J.R., Snider, F.D., Snihur, R., Soha, A., Somalwar, S., Sorin, V., Spalding, J., Spreitzer, T., Squillacioti, P., Stanitzki, M., St. Denis, R., Stelzer, B., Stelzer-Chilton, O., Stentz, D., Strologas, J., Stuart, D., Suh, J.S., Sukhanov, A., Suslov, I., Suzuki, T., Taffard, A., Takashima, R., Takeuchi, Y., Tanaka, R., Tecchio, M., Teng, P.K., Terashi, K., Thom, J., Thompson, A.S., Thompson, G.A., Thomson, E., Tipton, P., Tiwari, V., Tkaczyk, S., Toback, D., Tokar, S., Tollefson, K., Tomura, T., Tonelli, D., Torre, S., Torretta, D., Totaro, P., Tourneur, S., Tu, Y., Turini, N., Ukegawa, F., 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.G., Wagner, R.L., Wagner-Kuhr, J., Wagner, W., Wakisaka, T., Wallny, R., Wang, S.M., Warburton, A., Waters, D., Weinberger, M., Wester, W.C., Whitehouse, B., Whiteson, D., Wicklund, A.B., Wicklund, E., Williams, G., Williams, H.H., Wilson, P., Winer, B.L., Wittich, P., Wolbers, S., Wolfe, C., Wright, T., Wu, X., Wynne, S.M., Xie, S., Yagil, A., Yamamoto, K., Yamaoka, J., Yang, U.K., Yang, Y.C., Yao, W.M., Yeh, G.P., Yoh, J., Yorita, K., Yoshida, T., Yu, G.B., Yu, I., Yu, S.S., Yun, J.C., Zanello, L., Zanetti, A., Zaw, I., Zhang, X., Zheng, Y., Zucchelli, S

The rapid atmospheric monitoring system of the Pierre Auger Observatory

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Search for Supersymmetry in p (p)over-bar Collisions at root s=1.96 TeV Using the Trilepton Signature for Chargino-Neutralino Production

We use the three lepton and missing energy trilepton signature to search for chargino-neutralino production with 2.0 fb(-1) of integrated luminosity collected by the CDF II experiment at the Tevatron p (p) over bar collider. We expect an excess of approximately 11 supersymmetric events for a choice of parameters of the mSUGRA model, but our observation of 7 events is consistent with the standard model expectation of 6.4 events. We constrain the mSUGRA model of supersymmetry and rule out chargino masses up to 145 GeV/c(2) for a specific choice of parameters