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

Physical Review D - Particles, Fields, Gravitation and Cosmology 71:7 (2005) 1-7

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, M Agelou, JL Agram, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, T Andeen, S Anderson, B Andrieu, Y Arnoud, A Askew, B Åsman, O Atramentov, C Autermann, C Avila, F Badaud, A Baden, B Baldin, PW Balm, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, A Bean, S Beauceron, M Begel, A Bellavance, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Binder, C Biscarat, KM Black, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, U Blumenschein, A Boehnlein, O Boeriu, TA Bolton, F Borcherding, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, TH Burnett, E Busato, JM Butler, J Bystricky, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan, A Chandra, D Chapin, F Charles, E Cheu, L Chevalier, DK Cho, S Choi, B Choudhary, T Christiansen, L Christofek, D Claes, B Clément, C Clément

Abstract:

We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp̄ collisions at √s = 1.96 TeV using an integrated luminosity of 252 pb-1 collected at the Fermilab Tevatron collider by the D0 detector. We observe no evidence for LQ production in the topologies arising from LQLQ → eqeq and LQLQ → eqvq, and derive 95% C.L. lower limits on the LQ mass as a function of β, where β is the branching fraction for LQ → eq. The limits are 241 and 218 GeV/c 2 for β = 1 and 0.5, respectively. These results are combined with those obtained by D0 at √s = 1.8 TeV, which increases these LQ mass limits to 256 and 234 GeV/c2. © 2005 The American Physical Society.
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Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression

Astroparticle Physics 23 (2005) 325-339

Authors:

H Kraus, G Angloher, F Proebst, S Henry
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Measurement of the ratio of inclusive cross sections sigma(pp --> Z + b jet)/sigma(pp --> Z + jet) at square root(s) = 1.96 TeV.

Physical review letters 94:16 (2005) 161801

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, M Agelou, J-L Agram, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, S Anderson, B Andrieu, Y Arnoud, A Askew, B Asman, O Atramentov, C Autermann, C Avila, F Badaud, A Baden, B Baldin, PW Balm, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, A Bean, S Beauceron, M Begel, A Bellavance, SB Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Binder, KM Black, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, U Blumenschein, A Boehnlein, O Boeriu, TA Bolton, F Borcherding, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, TH Burnett, E Busato, JM Butler, J Bystricky, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan, A Chandra, D Chapin, F Charles, E Cheu, L Chevalier, DK Cho, S Choi, T Christiansen, L Christofek, D Claes, B Clément, C Clément, Y Coadou, M Cooke, WE Cooper, D Coppage, M Corcoran, J Coss, A Cothenet, M-C Cousinou, S Crépé-Renaudin, M Cristetiu, MAC Cummings, D Cutts, H da Motta, B Davies, G Davies, GA Davis, K De, P de Jong, SJ de Jong, E De la Cruz-Burelo, C De Oliveira Martins, S Dean, F Déliot, PA Delsart, M Demarteau, R Demina, P Demine, D Denisov, SP Denisov, S Desai, HT Diehl, M Diesburg, M Doidge, H Dong, S Doulas, L Duflot, SR Dugad, A Duperrin, J Dyer, A Dyshkant, M Eads, D Edmunds, T Edwards, J Ellison, J Elmsheuser, JT Eltzroth, VD Elvira, S Eno, P Ermolov, OV Eroshin, J Estrada, D Evans, H Evans, A Evdokimov, VN Evdokimov, J Fast, SN Fatakia, L Feligioni, T Ferbel, F Fiedler, F Filthaut, W Fisher, HE Fisk, M Fortner, H Fox, W Freeman, S Fu, S Fuess, T Gadfort, CF Galea, E Gallas, E Galyaev, C Garcia, A Garcia-Bellido, J Gardner, V Gavrilov, P Gay, D Gelé, R Gelhaus, K Genser, CE Gerber, Y Gershtein, G Ginther, T Golling, B Gómez, K Gounder, A Goussiou, PD Grannis, S Greder, H Greenlee, ZD Greenwood, EM Gregores, Ph Gris, J-F Grivaz, L Groer, S Grünendahl, MW Grünewald, SN Gurzhiev, G Gutierrez, P Gutierrez, A Haas, NJ Hadley, S Hagopian, I Hall, RE Hall, C Han, L Han, K Hanagaki, K Harder, R Harrington, JM Hauptman, R Hauser, J Hays, T Hebbeker, D Hedin, JM Heinmiller, AP Heinson, U Heintz, C Hensel, G Hesketh, MD Hildreth, R Hirosky, JD Hobbs, B Hoeneisen, M Hohlfeld, SJ Hong, R Hooper, P Houben, Y Hu, J Huang, I Iashvili, R Illingworth, AS Ito, S Jabeen, M Jaffré, S Jain, V Jain, K Jakobs, A Jenkins, R Jesik, K Johns, M Johnson, A Jonckheere, P Jonsson, H Jöstlein, A Juste, MM Kado, D Käfer, W Kahl, S Kahn, E Kajfasz, AM Kalinin, J Kalk, D Karmanov, J Kasper, D Kau, R Kehoe, S Kermiche, S Kesisoglou, A Khanov, A Kharchilava, YM Kharzheev, KH Kim, B Klima, M Klute, JM Kohli, M Kopal, VM Korablev, J Kotcher, B Kothari, A Koubarovsky, AV Kozelov, J Kozminski, S Krzywdzinski, S Kuleshov, Y Kulik, S Kunori, A Kupco, T Kurca, S Lager, N Lahrichi, G Landsberg, J Lazoflores, A-C Le Bihan, P Lebrun, SW Lee, WM Lee, A Leflat, F Lehner, C Leonidopoulos, P Lewis, J Li, QZ Li, JGR Lima, D Lincoln, SL Linn, J Linnemann, VV Lipaev, R Lipton, L Lobo, A Lobodenko, M Lokajicek, A Lounis, HJ Lubatti, L Lueking, M Lynker, AL Lyon, AKA Maciel, RJ Madaras, P Mättig, A Magerkurth, A-M Magnan, N Makovec, PK Mal, S Malik, VL Malyshev, HS Mao, Y Maravin, M Martens, SEK Mattingly, AA Mayorov, R McCarthy, R McCroskey, D Meder, HL Melanson, A Melnitchouk, M Merkin, KW Merritt, A Meyer, H Miettinen, D Mihalcea, J Mitrevski, N Mokhov, J Molina, NK Mondal, HE Montgomery, RW Moore, GS Muanza, M Mulders, YD Mutaf, E Nagy, M Narain, NA Naumann, HA Neal, JP Negret, S Nelson, P Neustroev, C Noeding, A Nomerotski, SF Novaes, T Nunnemann, E Nurse, V O'Dell, DC O'Neil, V Oguri, N Oliveira, N Oshima, GJ Otero y Garzón, P Padley, N Parashar, J Park, SK Park, J Parsons, R Partridge, N Parua, A Patwa, PM Perea, E Perez, O Peters, P Pétroff, M Petteni, L Phaf, R Piegaia, PLM Podesta-Lerma, VM Podstavkov, Y Pogorelov, BG Pope, WL Prado da Silva, HB Prosper, S Protopopescu, MB Przybycien, J Qian, A Quadt, B Quinn, KJ Rani, PA Rapidis, PN Ratoff, NW Reay, S Reucroft, M Rijssenbeek, I Ripp-Baudot, F Rizatdinova, C Royon, P Rubinov, R Ruchti, G Sajot, A Sánchez-Hernández, MP Sanders, A Santoro, G Savage, L Sawyer, T Scanlon, RD Schamberger, H Schellman, P Schieferdecker, C Schmitt, AA Schukin, A Schwartzman, R Schwienhorst, S Sengupta, H Severini, E Shabalina, M Shamim, V Shary, WD Shephard, D Shpakov, RA Sidwell, V Simak, V Sirotenko, P Skubic, P Slattery, RP Smith, K Smolek, GR Snow, J Snow, S Snyder, S Söldner-Rembold, X Song, Y Song, L Sonnenschein, A Sopczak, M Sosebee, K Soustruznik, M Souza, B Spurlock, NR Stanton, J Stark, J Steele, G Steinbrück, K Stevenson, V Stolin, A Stone, DA Stoyanova, J Strandberg, MA Strang, M Strauss, R Ströhmer, M Strovink, L Stutte, S Sumowidagdo, A Sznajder, M Talby, P Tamburello, W Taylor, P Telford, J Temple, S Tentindo-Repond, E Thomas, B Thooris, M Tomoto, T Toole, J Torborg, S Towers, T Trefzger, S Trincaz-Duvoid, B Tuchming, C Tully, AS Turcot, PM Tuts, L Uvarov, S Uvarov, S Uzunyan, B Vachon, R Van Kooten, WM van Leeuwen, N Varelas, EW Varnes, IA Vasilyev, M Vaupel, P Verdier, LS Vertogradov, M Verzocchi, F Villeneuve-Seguier, J-R Vlimant, E Von Toerne, M Vreeswijk, T Vu Anh, HD Wahl, R Walker, L Wang, Z-M Wang, J Warchol, M Warsinsky, G Watts, M Wayne, M Weber, H Weerts, M Wegner, N Wermes, A White, V White, D Whiteson, D Wicke, DA Wijngaarden, GW Wilson, SJ Wimpenny, J Wittlin, M Wobisch, J Womersley, DR Wood, TR Wyatt, Q Xu, N Xuan, R Yamada, M Yan, T Yasuda, YA Yatsunenko, Y Yen, K Yip, SW Youn, J Yu, A Yurkewicz, A Zabi, A Zatserklyaniy, M Zdrazil, C Zeitnitz, D Zhang, X Zhang, T Zhao, Z Zhao, B Zhou, J Zhu, M Zielinski, D Zieminska, A Zieminski, R Zitoun, V Zutshi, EG Zverev, A Zylberstejn, D0 Collaboration

Abstract:

Using the data collected with the D0 detector at square root(s) = 1.96 TeV, for integrated luminosities of about 180 pb(-1), we have measured the ratio of inclusive cross sections for pp --> Z + b jet to pp --> Z + jet production. The inclusive Z + b-jet reaction is an important background to searches for the Higgs boson in associated ZH production at the Fermilab Tevatron collider. Our measurement is the first of its kind, and relies on the Z --> e+ e- and Z --> mu+ mu- modes. The combined measurement of the ratio yields 0.021+/-0.005 for hadronic jets with transverse momenta pT > 20 GeV/c and pseudorapidities absolute value(eta) < 2.5, consistent with next-to-leading-order predictions of the standard model.
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Radiation-hard semiconductor detectors for SuperLHC

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 541:1-2 (2005) 189-201

Authors:

M Bruzzi, J Adey, A Al-Ajili, P Alexandrov, G Alfieri, PP Allport, A Andreazza, M Artuso, S Assouak, BS Avset, L Barabash, E Baranova, A Barcz, A Basile, R Bates, N Belova, SF Biagi, GM Bilei, D Bisello, A Blue, A Blumenau, V Boisvert, G Bolla, G Bondarenko, E Borchi, L Borrello, D Bortoletto, M Boscardin, L Bosisio, TJV Bowcock, TJ Brodbeck, J Broz, A Brukhanov, A Brzozowski, M Buda, P Buhmann, C Buttar, F Campabadal, D Campbell, A Candelori, G Casse, A Cavallini, A Chilingarov, D Chren, V Cindro, M Citterio, P Collins, R Coluccia, D Contarato, J Coutinho, D Creanza, W Cunningham, V Cvetkov, G-F Dalla Betta, G Davies, I Dawson, W de Boer, M De Palma, R Demina, P Dervan, A Dierlamm, S Dittongo, L Dobrzanski, Z Dolezal, A Dolgolenko, T Eberlein, V Eremin, C Fall, F Fasolo, T Ferbel, F Fizzotti, C Fleta, E Focardi, E Forton, S Franchenko, E Fretwurst, F Gamaz, C Garcia, JE Garcia-Navarro, E Gaubas, M-H Genest, KA Gill, K Giolo, M Glaser, C Goessling, V Golovine, S González Sevilla, I Gorelov, J Goss, A Gouldwell, G Grégoire, P Gregori, E Grigoriev, C Grigson, A Grillo, A Groza, J Guskov, L Haddad, J Härkönen, R Harding, F Hauler, S Hayama, M Hoeferkamp, F Hönniger, T Horazdovsky, R Horisberger, M Horn, A Houdayer, B Hourahine, A Hruban, G Hughes, I Ilyashenko, K Irmscher, A Ivanov, K Jarasiunas, T Jin, BK Jones, R Jones, C Joram, L Jungermann, E Kalinina, P Kaminski, A Karpenko, A Karpov, V Kazlauskiene, V Kazukauskas, V Khivrich, V Khomenkov, J Kierstead, J Klaiber-Lodewigs, M Kleverman, R Klingenberg, P Kodys, Z Kohout, S Korjenevski, A Kowalik, R Kozlowski, M Kozodaev, G Kramberger, O Krasel, A Kuznetsov, S Kwan, S Lagomarsino, T Lari, K Lassila-Perini, V Lastovetsky, G Latino, S Latushkin, S Lazanu, I Lazanu, C Lebel, K Leinonen, C Leroy, Z Li, G Lindström, L Lindstrom, V Linhart, A Litovchenko, P Litovchenko, V Litvinov, A Lo Giudice, M Lozano, Z Luczynski, P Luukka, A Macchiolo, A Mainwood, LF Makarenko, I Mandić, C Manfredotti, S Marti I Garcia, S Marunko, K Mathieson, A Mozzanti, J Melone, D Menichelli, C Meroni, A Messineo, S Miglio, M Mikuž, J Miyamoto, M Moll, E Monakhov, F Moscatelli, L Murin, F Nava, D Naoumov, E Nossarzewska-Orlowska, S Nummela, J Nysten, P Olivero, V Oshea, T Palviainen, C Paolini, C Parkes, D Passeri, U Pein, G Pellegrini, L Perera, M Petasecca, B Piatkowski, C Piemonte, GU Pignatel, N Pinho, I Pintilie, L Pintilie, L Polivtsev, P Polozov, AI Popa, J Popule, S Pospisil, G Pucker, V Radicci, JM Rafí, F Ragusa, M Rahman, R Rando, R Roeder, T Rohe, S Ronchin, C Rott, P Roy, A Roy, A Ruzin, A Ryazanov, HFW Sadrozinski, S Sakalauskas, M Scaringella, L Schiavulli, S Schnetzer, B Schumm, S Sciortino, A Scorzoni, G Segneri, S Seidel, A Seiden, G Sellberg, P Sellin, D Sentenac, I Shipsey, P Sicho, T Sloan, M Solar, S Son, B Sopko, N Spencer, J Stahl, I Stavitski, D Stolze, R Stone, J Storasta, N Strokan, W Strupinski, M Sudzius, B Surma, J Suuronen, A Suvorov, BG Svensson, P Tipton, M Tomasek, C Troncon, A Tsvetkov, E Tuominen, E Tuovinen, T Tuuva, M Tylchin, H Uebersee, J Uher, M Ullán, JV Vaitkus, P Vanni, J Velthuis, G Verzellesi, E Verbitskaya, V Vrba, G Wagner, I Wilhelm, S Worm, V Wright, R Wunstorf, P Zabierowski, A Zaluzhny, M Zavrtanik, M Zen, V Zhukov, N Zorzi
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Search for pentaquarks decaying to Ξπ in deep inelastic scattering at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 610:3-4 (2005) 212-224

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, J Repond, R Yoshida, MCK Mattingly, N Pavel, AG Yagües Molina, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, P Giusti, G Iacobucci, A Margotti, A Montanari, R Nania, F Palmonari, A Pesci, A Polini, L Rinaldi, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, O Kind, U Meyer, E Paul, J Rautenberg, R Renner, KC Voss, M Wang, M Wlasenko, DS Bailey, NH Brook, JE Cole, GP Heath, T Namsoo, S Robins, M Capua, A Mastroberardino, M Schioppa, G Susinno, E Tassi, JY Kim, KJ Ma, M Helbich, Y Ning, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, K Olkiewicz, P Stopa, D Szuba, L Zawiejski, L Adamczyk, T Bołd, I Grabowska-Bołd, D Kisielewska, AM Kowal, J Łukasik, M Przybycień, L Suszycki, J Szuba, A Kotański, W Słomiński, V Adler, U Behrens, I Bloch, K Borras, G Drews, J Fourletova, A Geiser, D Gladkov, P Göttlicher, O Gutsche, T Haas, W Hain, C Horn

Abstract:

A search for pentaquarks decaying to Ξ-π- (Ξ-π+) and corresponding antiparticles has been performed with the ZEUS detector at HERA. The data sample consists of deep inelastic ep scattering events at centre-of-mass energies of 300 and 318 GeV, and corresponds to 121 pb -1 of integrated luminosity. A clear signal for Ξ0(1530) →Ξ-π+ was observed. However, no signal for any new baryonic state was observed at higher masses in either the Ξ-π- or Ξ-π+ channels. The searches in the antiparticle channels were also negative. Upper limits on the ratio of a possible Ξ3/2 - (Ξ3/20) signal to the Ξ0(1530) signal were set in the mass range 1650-2350 MeV. © 2005 Elsevier B.V. All rights reserved.
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