Search for first-generation scalar leptoquarks in p p collisions at √s = 1.96 TeV

/ Authors

The Cdf Collaboration D.Acosta, J.Adelman, T.Affolder, T.Akimoto, M.G.Albrow, D.Ambrose, S.Amerio, D.Amidei, A.Anastassov, K.Anikeev

and 490 more authors

A.Annovi, J.Antos, M.Aoki, G.Apollinari, T.Arisawa, J-F.Arguin, A.Artikov, W.Ashmanskas, A.Attal, F.Azfar, P.Azzi-Bacchetta, N.Bacchetta, H.Bachacou, W.Badgett, A.Barbaro-Galtieri, G.J.Barker, V.E.Barnes, B.A.Barnett, S.Baroiant, G.Bauer, F.Bedeschi, S.Behari, S.Belforte, G.Bellettini, J.Bellinger, A.Belloni, E.Ben-Haim, D.Benjamin, A.Beretvas, T.Berry, A.Bhatti, M.Binkley, D.Bisello, M.Bishai, R.E.Blair, C.Blocker, K.Bloom, B.Blumenfeld, A.Bocci, A.Bodek, G.Bolla, A.Bolshov, D.Bortoletto, J.Boudreau, S.Bourov, B.Brau, C.Bromberg, E.Brubaker, J.Budagov, H.S.Budd, K.Burkett, G.Busetto, P.Bussey, K.L.Byrum, S.cabrera, M.Campanelli, M.Campbell, F.Canelli, A.Canepa, M.Casarsa, D.Carlsmith, R.Carosi, S.Carron, M.Cavalli-Sforza, a-Castro, P.Catastini, D.Cauz, A.Cerri, L.Cerrito, J.Chapman, Y.C.Chen, M.Chertok, G.Chiarelli, G.Chlachidze, F.Chlebana, I.Cho, K.Cho, D.Chokheli, J.P.Chou, S.Chuang, K.Chung, W.H.Chung, Y.S.Chung, M.Cijliak, C.I.Ciobanu, M.A.Ciocci, A.G.Clark, D.Clark, M.Coca, A.Connolly, M.Convery, J.Conway, B.Cooper, K.Copic, M.Cordelli, G.Cortiana, J.Cranshaw, J.Cuevas, A.Cruz, R.Culbertson, C.Currat, D.Cyr, D.Dagenhart, S.DaRonco, S.D'Auria, P.deBarbaro, S.Dececco, A.Deisher, G.DeLentdecker, M.Dell'Orso, S.Demers, L.Demortier, M.Deninno, D.Depedis, P.F.Derwent, T.Devlin, C.Dionisi, J.R.Dittmann, P.DiTuro, C.Dorr, A.Dominguez, S.Donati, M.Donega, J.Donini, M.D'Onofrio, T.Dorigo, K.Ebina, J.Efron, J.Ehlers, R.Erbacher, M.Erdmann, D.Errede, S.Errede, R.Eusebi, H-C.Fang, S.Farrington, I.Fedorko, W.T.Fedorko, R.G.Feild, M.Feindt, J.P.Fernandez, R.D.Field, G.Flanagan, L.R.Flores-Castillo, A.Foland, S.Forrester, G.W.Foster, M.Franklin, J.C.Freeman, Y.Fujii, I.Furic, A.Gajjar, M.Gallinaro, J.Galyardt, M.Garcia-Sciveres, A.F.Garfinkel, C.Gay, H.Gerberich, D.W.Gerdes, E.Gerchtein, S.Giagu, P.Giannetti, A.Gibson, K.Gibson, C.Ginsburg, K.Giolo, M.Giordani, M.Giunta, G.Giurgiu, V.Glagolev, D.Glenzinski, M.Gold, N.Goldschmidt, D.Goldstein, J.Goldstein, G.Gomez, G.Gomez-Ceballos, M.Goncharov, O.Gonz'alez, I.Gorelov, A.T.Goshaw, Y.Gotra, K.Goulianos, A.Gresele, M.Griffiths, C.Grosso-Pilcher, U.Grundler, J.GuimaraesdaCosta, C.Haber, K.Hahn, S.R.Hahn, E.Halkiadakis, A.Hamilton, B-Y.Han, R.Handler, F.Happacher, K.Hara, M.Hare, R.F.Harr, R.M.Harris, F.Hartmann, K.Hatakeyama, J.Hauser, C.Hays, H.Hayward, B.Heinemann, J.Heinrich, M.Hennecke, M.Herndon, C.Hill, D.Hirschbuehl, A.Hocker, K.D.Hoffman, A.Holloway, S.Hou, M.A.Houlden, B.T.Huffman, Y.Huang, R.E.Hughes, J.Huston, K.Ikado, J.Incandela, G.Introzzi, M.Iori, Y.Ishizawa, C.Issever, A.Ivanov, Y.Iwata, B.Iyutin, E.James, D.Jang, B.Jayatilaka, D.Jeans, H.Jensen, E.J.Jeon, M.Jones, K.K.Joo, S.Y.Jun, T.Junk, T.Kamon, J.Kang, M.KaragozUnel, P.E.Karchin, Y.Kato, Y.Kemp, R.Kephart, U.Kerzel, V.Khotilovich, B.Kilminster, D.H.Kim, H.S.Kim, J.E.Kim, M.J.Kim, M.S.Kim, S.B.Kim, S.H.Kim, Y.K.Kim, M.Kirby, L.Kirsch, S.Klimenko, M.Klute, B.Knuteson, B.R.Ko, H.Kobayashi, D.J.Kong, K.Kondo, J.Konigsberg, K.Kordas, A.Korn, A.Korytov, A.V.Kotwal, A.Kovalev, J.Kraus, I.Kravchenko, A.Kreymer, J.Kroll, M.Kruse, V.Krutelyov, S.E.Kuhlmann, S.Kwang, A.T.Laasanen, S.Lai, S.Lami, S.Lammel, M.Lancaster, R.Lander, K.Lannon, A.Lath, G.Latino, I.Lazzizzera, C.Lecci, T.LeCompte, J.Lee, S.W.Lee, R.Lefevre, N.Leonardo, S.Leone, S.Levy, J.D.Lewis, K.Li, C.Lin, C.S.Lin, M.Lindgren, E.Lipeles, T.M.Liss, A.Lister, D.O.Litvintsev, T.Liu, Y.Liu, N.S.Lockyer, A.Loginov, M.Loreti, P.Loverre, R.S.Lu, D.Lucchesi, P.Lujan, P.Lukens, G.Lungu, L.Lyons, J.Lys, R.Lysak, E.Lytken, D.MacQueen, R.Madrak, K.Maeshima, P.Maksimovic, G.Manca, F. Margaroli, R.Marginean, C.Marino, A.Martin, M.Martin, V.Martin, M.Mart'inez, T.Maruyama, H.Matsunaga, M.Mattson, P.Mazzanti, K.S.McFarland, D.McGivern, P.M.McIntyre, P.McNamara, R. McNulty, A.Mehta, S.Menzemer, A.Menzione, P.Merkel, C.Mesropian, A.Messina, T.Miao, N.Miladinovic, J.Miles, L.Miller, R.Miller, J.S.Miller, C.Mills, R.Miquel, S.Miscetti, G.Mitselmakher, A.Miyamoto, N.Moggi, B.Mohr, R.Moore, M.Morello, P.A.MovillaFernandez, J.Muelmenstaedt, A.Mukherjee, M.Mulhearn, T.Muller, R.Mumford, A.Munar, P.Murat, J.Nachtman, S.Nahn, I.Nakano, A.Napier, R.Napora, D.Naumov, V.Necula, J.Nielsen, T.Nelson, C.Neu, M.S.Neubauer, T.Nigmanov, L.Nodulman, O.Norniella, T.Ogawa, S.H.Oh, Y.D.Oh, T.Ohsugi, T.Okusawa, R.Oldeman, R.Orava, W.Orejudos, K.Osterberg, C.Pagliarone, E.Palencia, R.Paoletti, V.Papadimitriou, A.A.Paramonov, S.Pashapour, J.Patrick, G.Pauletta, M.Paulini, C.Paus, D.Pellett, A.Penzo, T.J.Phillips, G.Piacentino, J.Piedra, K.T.Pitts, C.Plager, L.Pondrom, G.Pope, X.Portell, O.Poukhov, N.Pounder, F.Prakoshyn, A.Pronko, J.Proudfoot, F.Ptohos, G.Punzi, J.Rademacker, M.A.Rahaman, A.Rakitine, S.Rappoccio, F.Ratnikov, H.Ray, B.Reisert, V.Rekovic, P.Renton, M.Rescigno, F.Rimondi, K.Rinnert, L.Ristori, W.J.Robertson, A.Robson, T.Rodrigo, S.Rolli, R.Roser, R.Rossin, C.Rott, J.Russ, V.Rusu, A.Ruiz, D.Ryan, H.Saarikko, S.Sabik, A.Safonov, R.St.Denis, W.K.Sakumoto, G.Salamanna, D.Saltzberg, C.Sanchez, L.Santi, S.Sarkar, K.Sato, P.Savard, A.Savoy-Navarro, P.Schlabach, E.E.Schmidt, M.P.Schmidt, M.Schmitt, T.Schwarz, L.Scodellaro, A.L.Scott, A.Scribano, F.Scuri, A.Sedov, S.Seidel, Y.Seiya, A.Semenov, F.Semeria, L.Sexton-Kennedy, I.Sfiligoi, M.D.Shapiro, T.Shears, P.F.Shepard, D.Sherman, M.Shimojima, M.Shochet, Y.Shon, I.Shreyber, A.Sidoti, A.Sill, P.Sinervo, A.Sisakyan, J.Sjolin, A.Skiba, A.J.Slaughter

/ Abstract

We report on a search for pair production of first-generation scalar leptoquarks ($LQ$) in $p \bar{p}$ collisions at $\sqrt{s}$=1.96 TeV using an integrated luminosity of 203 $pb^{-1}$ collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for $LQ$ production in the topologies arising from $LQ \bar{LQ} \to eqeq$ and $LQ \bar{LQ} \to eq \nu q$, and derive 95% C.L. upper limits on the $LQ$ production cross section. %as a function of $\beta$, where $\beta$ is the branching fraction for $LQ \to eq$. The results are combined with those obtained from a separately reported CDF search in the topology arising from $LQ\bar{LQ} \to \nu q \nu q$ and 95% C.L. lower limits on the LQ mass as a function of $\beta = BR(LQ \to eq) $ are derived. The limits are 236, 205 and 145 GeV/c$^2$ for $\beta$ = 1, $\beta$ = 0.5 and $\beta$ = 0.1, respectively.

Journal: Physical Review D

DOI: 10.1103/PhysRevD.72.051107