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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Sneha Malde

Associate Professor of Physics

Sub department

  • Particle Physics

Research groups

  • LHCb
Sneha.Malde@physics.ox.ac.uk
Telephone: 01865 (2)73357
Denys Wilkinson Building, room 673
  • About
  • Publications

Measurement of the effective B → J/ψK lifetime

Nuclear Physics B 837:1-2 (2010) 275-292

Authors:

I Bediaga, JM De Miranda, F Ferreira Rodrigues, A Massafferri, I Nasteva, AC dos Reis, S Amato, K Carvalho Akiba, L De Paula, O Francisco, M Gandelman, A Gomes, JH Lopes, D Martins Tostes, JM Otalora Goicochea, E Polycarpo, MS Rangel, V Salustino Guimaraes, B Souza De Paula, D Vieira, P Chen, Y Gao, F Jing, Y Li, B Liu, H Lu, S Wu, Z Yang, X Yuan, F Zhang, Y Zhang, L Zhong, I De Bonis, D Decamp, N Déléage, P Ghez, P Hopchev, J-P Lees, IV Machikhiliyan, M-N Minard, B Pietrzyk, W Qian, S T'Jampens, V Tisserand, E Tournefier, Z Ajaltouni, E Cogneras, O Deschamps, I El Rifai, M Grabalosa Gándara, P Henrard, M Hoballah, R Lefèvre, L Li Gioi, S Monteil, V Niess, P Perret, DA Roa Romero, C Adrover, E Aslanides, J Cogan, R Le Gac, O Leroy, G Mancinelli, E Maurice, M Perrin-Terrin, M Sapunov, J Serrano, A Tsaregorodtsev, Y Amhis, S Barsuk, O Callot, O Kochebina, J Lefrançois, F Machefert, A Martín Sánchez, M Nicol, P Robbe, M-H Schune, M Teklishyn, B Viaud, E Ben-Haim, S Coquereau, P David, L Del Buono, A Martens, DA Milanes, F Polci, J Albrecht, T Brambach, C Cauet, M Deckenhoff, U Eitschberger, R Ekelhof, M Kaballo, F Kruse, F Meier, R Niet, M Schlupp, B Spaan, S Swientek, J Wishahi, O Aquines Gutierrez, M Britsch, M Fontana, D Popov, M Schmelling, D Volyanskyy, H Voss, M Zavertyaev, S Bachmann, A Bien, J Blouw, A Di Canto, F Dordei, C Färber, E Gersabeck, S Hansmann-Menzemer, A Jaeger, K Kreplin, G Krocker, B Leverington, C Linn, J Marks, M Meissner, T Nikodem, P Seyfert, S Stahl, J van Tilburg, U Uwer, S Wandernoth, D Wiedner, A Zhelezov, S Farry, P Ilten, R McNulty, R Wallace, WC Zhang, A Palano, A Carbone, D Derkach, A Falabella, D Galli, U Marconi, S Perazzini, V Vagnoni, G Valenti, M Zangoli, W Bonivento, S Cadeddu, A Cardini, A Contu, A Lai, G Manca, R Oldeman, B Saitta, W Baldini, C Bozzi, M Fiore, A Mazurov, M Savrie, I Shapoval, S Vecchi, L Anderlini, A Bizzeti, M Frosini, G Graziani, G Passaleva, M Veltri, F Archilli, G Bencivenni, P Campana, P De Simone, G Lanfranchi, M Palutan, A Sarti, B Sciascia, F Soomro, R Cardinale, F Fontanelli, C Patrignani, A Petrolini, M Sannino, M Calvi, S Furcas, B Khanji, M Kucharczyk, C Matteuzzi, DL Perego, G Pessina, S Amerio, G Busetto, D Lucchesi, F Bedeschi, S Leo, MJ Morello, G Punzi, F Ruffini, G Carboni, F Di Ruscio, E Furfaro, E Santovetti, A Satta, AA Alves Jr, G Auriemma, V Bocci, G Martellotti, G Penso, D Pinci, G Sabatino, R Santacesaria, C Satriano, A Sciubba, M Chrzaszcz, A Dziurda, T Lesiak, P Morawski, G Polok, J Wiechczynski, M Witek, M Idzik, B Muryn, A Oblakowska-Mucha, K Senderowska, T Szumlak, M Szczekowski, A Ukleja, I Burducea, C Coca, M Dogaru, A Grecu, F Maciuc, R Muresan, M Orlandea, C Pavel-Nicorescu, B Popovici, S Stoica, M Straticiuc, E Teodorescu, G Alkhazov, N Bondar, A Dzyuba, O Maev, N Sagidova, Y Shcheglov, A Vorobyev, V Balagura, S Belogurov, I Belyaev, V Egorychev, D Golubkov, A Golutvin, T Kvaratskheliya, D Savrina, A Semennikov, P Shatalov, V Shevchenko, A Zhokhov, A Berezhnoy, M Korolev, A Leflat, N Nikitin, S Filippov, E Gushchin, L Kravchuk, A Bondar, S Eidelman, P Krokovny, V Kudryavtsev, A Poluektov, L Shekhtman, V Vorobyev, A Artamonov, K Belous, R Dzhelyadin, Y Guz, A Novoselov, V Obraztsov, A Popov, V Romanovsky, M Shapkin, O Yushchenko, C Abellan Beteta, M Calvo Gomez, A Camboni, A Comerma-Montells, L Garrido, R Graciani Diaz, E Graugés, E Lopez Asamar, A Oyanguren, A Pérez-Calero Yzquierdo, E Picatoste Olloqui, C Potterat, V Rives Molina, H Ruiz, P Ruiz Valls, R Vazquez Gomez, X Vilasis-Cardona, B Adeva, P Alvarez Cartelle, A Dosil Suárez, V Fernandez Albor, A Gallas Torreira, JA Hernando Morata, A Pazos Alvarez, E Perez Trigo, M Plo Casasus, P Rodriguez Perez, A Romero Vidal, JJ Saborido Silva, B Sanmartin Sedes, C Santamarina Rios, M Seco, P Vazquez Regueiro, F Alessio, C Barschel, T Blake, J Buytaert, D Campora Perez, L Castillo Garcia, M Cattaneo, P Charpentier, K Ciba, X Cid Vidal, M Clemencic, J Closier, P Collins, G Corti, B Couturier, C D'Ambrosio, H Dijkstra, S Easo, L Eklund, M Ferro-Luzzi, C Fitzpatrick, R Forty, M Frank, C Frei, C Gaspar, T Gershon, VV Gligorov, LA Granado Cardoso, T Gys, C Haen, J He, E van Herwijnen, R Jacobsson, C Joram, B Jost, M Karacson, TM Karbach, U Kerzel, D Lacarrere, E Lanciotti, C Langenbruch, R Lindner, G Liu, S Lohn, R Matev, Z Mathe, N Neufeld, J Panman, M Pepe Altarelli, N Rauschmayr, S Roiser, T Ruf, H Schindler, B Schmidt, A Schopper, R Schwemmer, T Shears, F Stagni, VK Subbiah, P Szczypka, F Teubert, E Thomas, D Tonelli, M Ubeda Garcia, M Vesterinen, J Wicht, K Wyllie, Y Xie, A Zvyagin, A Bay, F Blanc, J Bressieux, F Dupertuis, V Fave, G Haefeli, P Jaton, A Keune, I Komarov, VN La Thi, N Lopez-March, J Luisier, R Märki, B Muster, T Nakada, AD Nguyen, TD Nguyen, C Nguyen-Mau, J Prisciandaro, A Puig Navarro, B Rakotomiaramanana, J Rouvinet, O Schneider, M Tobin, S Tourneur, MT Tran, G Veneziano, J Anderson, R Bernet, E Bowen, A Bursche, N Chiapolini, M De Cian, C Elsasser, K Müller, C Salzmann, N Serra, O Steinkamp, B Storaci, U Straumann, M Tresch, A Vollhardt, R Aaij, S Ali, T Bauer, M van Beuzekom, V Coco, PNY David, K De Bruyn, D van Eijk, C Farinelli, V Heijne, W Hulsbergen, E Jans, P Koppenburg, A Kozlinskiy, J van Leerdam, M Martinelli, M Merk, I Mous, S Oggero, A Pellegrino, P Tsopelas, N Tuning, L Wiggers, J van den Brand, F Dettori, T Ketel, RF Koopman, RW Lambert, D Martinez Santos, G Raven, M Schiller, V Syropoulos, S Tolk, A Dovbnya, S Kandybei, I Raniuk, O Shevchenko, V Iakovenko, O Okhrimenko, V Pugatch, S Bifani, D Elsby, P Griffith, IR Kenyon, C Lazzeroni, J McCarthy, NK Watson, M Adinolfi, J Benton, NH Brook, A Cook, M Coombes, T Hampson, ST Harnew, P Naik, JH Rademacker, D Souza, JJ Velthuis, D Voong, W Barter, M-O Bettler, HV Cliff, J Garra Tico, V Gibson, S Gregson, SC Haines, CR Jones, DR Ward, SA Wotton, S Wright, JJ Back, DC Craik, D Dossett, M Kreps, T Latham, T Pilař, MM Reid, R Silva Coutinho, M Whitehead, MP Williams, R Nandakumar, A Papanestis, GN Patrick, S Ricciardi, E Smith, FF Wilson, S Benson, H Carranza-Mejia, PEL Clarke, GA Cowan, R Currie, S Eisenhardt, G Fardell, D Ferguson, D Lambert, H Luo, F Muheim, M Needham, S Playfer, A Sparkes, R Young, M Alexander, J Beddow, D Hynds, I Longstaff, S Ogilvy, M Pappagallo, P Sail, FJP Soler, P Spradlin, A Affolder, TJV Bowcock, H Brown, G Casse, S Donleavy, K Hennessy, E Hicks, T Huse, D Hutchcroft, M Liles, GD Patel, K Rinnert, NA Smith, L Carson, G Ciezarek, S Cunliffe, U Egede, S Hall, P Owen, CJ Parkinson, M Patel, K Petridis, A Richards, P Schaack, I Sepp, A Shires, D Websdale, RB Appleby, RJ Barlow, T Bird, PM Bjørnstad, S Borghi, D Brett, S De Capua, P Garosi, M Gersabeck, J Harrison, C Hombach, G Lafferty, A McNab, D Moran, C Parkes, E Rodrigues, M Smith, D Urner, AD Webber, M Charles, R Gauld, H Gordon, E Greening, N Harnew, D Hill, P Hunt, N Hussain, M John, D Johnson, S Malde, L Martin, B Meadows, A Nomerotski, A Powell, S Redford, C Thomas, S Topp-Joergensen, N Torr, G Wilkinson, F Xing, M Williams, R Andreassen, A Davis, W De Silva, MD Sokoloff, L Sun, M Artuso, S Blusk, A Borgia, T Britton, P Gandini, J Garofoli, B Gui, C Hadjivasiliou, R Mountain, BK Pal, A Phan, T Skwarnicki, S Stone, J Wang, Z Xing, L Zhang, C Baesso, C Göbel, J Molina Rodriguez, O Grünberg, T Hartmann, C Voß, R Waldi

Abstract:

This paper reports the first measurement of the effective B →J/ψK lifetime and an updated measurement of its time-integrated branching fraction. Both measurements are performed with a data sample, corresponding to an integrated luminosity of 1.0 fb of pp collisions, recorded by the LHCb experiment in 2011 at a centre-of-mass energy of 7 TeV. The results are: τ = 1.75±0.12 (stat)±0.07 (syst) ps and B(B →J/ψK ) = (1.97 ± 0.23) × 10. For the latter measurement, the uncertainty includes both statistical and systematic sources. © 2013 CERN. Published by Elsevier B.V.
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Measurement of Zγ production in pp̄ collisions at √s=1.96TeV

Physical Review D - Particles, Fields, Gravitation and Cosmology 82:3 (2010)

Authors:

T Aaltonen, J Adelman, B Álvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, J Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, A Attal, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, G Bauer, PH Beauchemin, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, D Bortoletto, J Boudreau, A Boveia, B Brau, A Bridgeman, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, K Chung, WH Chung, YS Chung, T Chwalek, CI Ciobanu, MA Ciocci, A Clark, D Clark, G Compostella, ME Convery, J Conway

Abstract:

The production rate and kinematics of photons produced in association with Z bosons are studied using 2fb-1 of pp̄ collision data collected at the Collider Detector at Fermilab. The cross section for pp̄→"+-γ+X (where the leptons " are either muons or electrons with dilepton mass M>40GeV/c2, and where the photon has transverse energy ETγ>7GeV and is well separated from the leptons) is 4.6±0.2(stat)±0.3(syst)±0.3(lum)pb, which is consistent with standard model expectations. We use the photon ET distribution from Zγ events where the Z has decayed to μ+μ -, e+e-, or νν̄ to set limits on anomalous (non standard model) trilinear couplings between photons and Z bosons. © 2010 The American Physical Society.
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Search for the production of scalar bottom quarks in pp collisions at square root(s) = 1.96 TeV.

Phys Rev Lett 105:8 (2010) 081802

Authors:

T Aaltonen, J Adelman, B Alvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, A Attal, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, G Bauer, P-H Beauchemin, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, D Bortoletto, J Boudreau, A Boveia, B Brau, A Bridgeman, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, K Chung, WH Chung, YS Chung, T Chwalek, CI Ciobanu, MA Ciocci, A Clark, D Clark, G Compostella, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Crescioli, C Cuenca Almenar, J Cuevas, R Culbertson, JC Cully, D Dagenhart, M Datta, T Davies, P de Barbaro, S De Cecco, A Deisher, G De Lorenzo, M Dell'Orso, C Deluca, L Demortier, J Deng, M Deninno, M d'Errico, A Di Canto, GP di Giovanni, B Di Ruzza, JR Dittmann, M D'Onofrio, S Donati, P Dong, T Dorigo, S Dube, K Ebina, A Elagin, R Erbacher, D Errede, S Errede, N Ershaidat, R Eusebi, HC Fang, S Farrington, WT Fedorko, RG Feild, M Feindt, JP Fernandez, C Ferrazza, R Field, G Flanagan, R Forrest, MJ Frank, M Franklin, JC Freeman, I Furic, M Gallinaro, J Galyardt, F Garberson, JE Garcia, AF Garfinkel, P Garosi, H Gerberich, D Gerdes, A Gessler, S Giagu, V Giakoumopoulou, P Giannetti, K Gibson, JL Gimmell, CM Ginsburg, N Giokaris, M Giordani, P Giromini, M Giunta, G Giurgiu, V Glagolev, D Glenzinski, M Gold, N Goldschmidt, A Golossanov, G Gomez, G Gomez-Ceballos, M Goncharov, O González, I Gorelov, AT Goshaw, K Goulianos, A Gresele, S Grinstein, C Grosso-Pilcher, RC Group, U Grundler, J Guimaraes da Costa, Z Gunay-Unalan, C Haber, SR Hahn, E Halkiadakis, B-Y Han, JY Han, F Happacher, K Hara, D Hare, M Hare, RF Harr, M Hartz, K Hatakeyama, C Hays, M Heck, J Heinrich, M Herndon, J Heuser, S Hewamanage, D Hidas, CS Hill, D Hirschbuehl, A Hocker, S Hou, M Houlden, S-C Hsu, RE Hughes, M Hurwitz, U Husemann, M Hussein, J Huston, J Incandela, G Introzzi, M Iori, A Ivanov, E James, D Jang, B Jayatilaka, EJ Jeon, MK Jha, S Jindariani, W Johnson, M Jones, KK Joo, SY Jun, JE Jung, TR Junk, T Kamon, D Kar, PE Karchin, Y Kato, R Kephart, W Ketchum, J Keung, V Khotilovich, B Kilminster, DH Kim, HS Kim, HW Kim, JE Kim, MJ Kim, SB Kim, SH Kim, YK Kim, N Kimura, L Kirsch, S Klimenko, K Kondo, DJ Kong, J Konigsberg, A Korytov, AV Kotwal, M Kreps, J Kroll, D Krop, N Krumnack, M Kruse, V Krutelyov, T Kuhr, NP Kulkarni, M Kurata, S Kwang, AT Laasanen, S Lami, S Lammel, M Lancaster, RL Lander, K Lannon, A Lath, G Latino, I Lazzizzera, T LeCompte, E Lee, HS Lee, JS Lee, SW Lee, S Leone, JD Lewis, C-J Lin, J Linacre, M Lindgren, E Lipeles, A Lister, DO Litvintsev, C Liu, T Liu, NS Lockyer, A Loginov, L Lovas, D Lucchesi, J Lueck, P Lujan, P Lukens, G Lungu, J Lys, R Lysak, D MacQueen, R Madrak, K Maeshima, K Makhoul, P Maksimovic, S Malde, S Malik, G Manca, A Manousakis-Katsikakis, F Margaroli, C Marino, CP Marino, A Martin, V Martin, M Martínez, R Martínez-Ballarín, P Mastrandrea, M Mathis, ME Mattson, P Mazzanti, KS McFarland, P McIntyre, R McNulty, A Mehta, P Mehtala, A Menzione, C Mesropian, T Miao, D Mietlicki, N Miladinovic, R Miller, C Mills, M Milnik, A Mitra, G Mitselmakher, H Miyake, S Moed, N Moggi, MN Mondragon, CS Moon, R Moore, MJ Morello, J Morlock, P Movilla Fernandez, J Mülmenstädt, A Mukherjee, Th Muller, P Murat, M Mussini, J Nachtman, Y Nagai, J Naganoma, K Nakamura, I Nakano, A Napier, J Nett, C Neu, MS Neubauer, S Neubauer, J Nielsen, L Nodulman, M Norman, O Norniella, E Nurse, L Oakes, SH Oh, YD Oh, I Oksuzian, T Okusawa, R Orava, K Osterberg, S Pagan Griso, C Pagliarone, E Palencia, V Papadimitriou, A Papaikonomou, AA Paramanov, B Parks, S Pashapour, J Patrick, G Pauletta, M Paulini, C Paus, T Peiffer, DE Pellett, A Penzo, TJ Phillips, G Piacentino, E Pianori, L Pinera, K Pitts, C Plager, L Pondrom, K Potamianos, O Poukhov, F Prokoshin, A Pronko, F Ptohos, E Pueschel, G Punzi, J Pursley, J Rademacker, A Rahaman, V Ramakrishnan, N Ranjan, I Redondo, P Renton, M Renz, M Rescigno, S Richter, F Rimondi, L Ristori, A Robson, T Rodrigo, T Rodriguez, E Rogers, S Rolli, R Roser, M Rossi, R Rossin, P Roy, A Ruiz, J Russ, V Rusu, B Rutherford, H Saarikko, A Safonov, WK Sakumoto, L Santi, L Sartori, K Sato, A Savoy-Navarro, P Schlabach, A Schmidt, EE Schmidt, MA Schmidt, MP Schmidt, M Schmitt, T Schwarz, L Scodellaro, A Scribano, F Scuri, A Sedov, S Seidel, Y Seiya, A Semenov, L Sexton-Kennedy, F Sforza, A Sfyrla, SZ Shalhout, T Shears, PF Shepard, M Shimojima, S Shiraishi, M Shochet, Y Shon, I Shreyber, A Simonenko, P Sinervo, A Sisakyan, AJ Slaughter, J Slaunwhite, K Sliwa, JR Smith, FD Snider, R Snihur, A Soha, S Somalwar, V Sorin, P Squillacioti, M Stanitzki, R St Denis, B Stelzer, O Stelzer-Chilton, D Stentz, J Strologas, GL Strycker, JS Suh, A Sukhanov, I Suslov, A Taffard, R Takashima, Y Takeuchi, R Tanaka, J Tang, M Tecchio, PK Teng, J Thom, J Thome, GA Thompson, E Thomson, P Tipton, P Ttito-Guzmán, S Tkaczyk, D Toback, S Tokar, K Tollefson, T Tomura, D Tonelli, S Torre, D Torretta, P Totaro, S Tourneur, M Trovato, S-Y Tsai, Y Tu, N Turini, F Ukegawa, S Uozumi, N van Remortel, A Varganov, E Vataga, F Vázquez, G Velev, C Vellidis, M Vidal, I Vila, R Vilar, M Vogel, I Volobouev, G Volpi, P Wagner, RG Wagner, RL Wagner, W Wagner, J Wagner-Kuhr, T Wakisaka, R Wallny, SM Wang, A Warburton, D Waters, M Weinberger, J Weinelt, WC Wester, B Whitehouse, D Whiteson, AB Wicklund, E Wicklund, S Wilbur, G Williams, HH Williams, P Wilson, BL Winer, P Wittich, S Wolbers, C Wolfe, H Wolfe, T Wright, X Wu, F Würthwein, A Yagil, K Yamamoto, J Yamaoka, UK Yang, YC Yang, WM Yao, GP Yeh, K Yi, J Yoh, K Yorita, T Yoshida, GB Yu, I Yu, SS Yu, JC Yun, A Zanetti, Y Zeng, X Zhang, Y Zheng, S Zucchelli, CDF Collaboration

Abstract:

We report on a search for direct scalar bottom quark (sbottom) pair production in pp collisions at square root(s) = 1.96 TeV, in events with large missing transverse energy and two jets of hadrons in the final state, where at least one of the jets is required to be identified as originating from a b quark. The study uses a collider detector at Fermilab Run II data sample corresponding to 2.65 fb(-1) of integrated luminosity. The data are in agreement with the standard model. In an R-parity conserving minimal supersymmetric scenario, and assuming that the sbottom decays exclusively into a bottom quark and a neutralino, 95% confidence-level upper limits on the sbottom pair production cross section of 0.1 pb are obtained. For neutralino masses below 70 GeV/c2, sbottom masses up to 230 GeV/c2 are excluded at 95% confidence level.
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Search for the production of scalar bottom quarks in pp̄ collisions at √s=1.96TeV

Physical Review Letters 105:8 (2010)

Authors:

T Aaltonen, J Adelman, B Álvarez González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, A Attal, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, G Bauer, PH Beauchemin, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, D Bortoletto, J Boudreau, A Boveia, B Brau, A Bridgeman, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, K Chung, WH Chung, YS Chung, T Chwalek, CI Ciobanu, MA Ciocci, A Clark, D Clark, G Compostella, ME Convery, J Conway, M Corbo

Abstract:

We report on a search for direct scalar bottom quark (sbottom) pair production in pp̄ collisions at √s=1.96TeV, in events with large missing transverse energy and two jets of hadrons in the final state, where at least one of the jets is required to be identified as originating from a b quark. The study uses a collider detector at Fermilab Run II data sample corresponding to 2.65fb-1 of integrated luminosity. The data are in agreement with the standard model. In an R-parity conserving minimal supersymmetric scenario, and assuming that the sbottom decays exclusively into a bottom quark and a neutralino, 95% confidence-level upper limits on the sbottom pair production cross section of 0.1 pb are obtained. For neutralino masses below 70GeV/c2, sbottom masses up to 230GeV/c2 are excluded at 95% confidence level. © 2010 The American Physical Society.
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Prompt K_short production in pp collisions at sqrt(s)=0.9 TeV

ArXiv 1008.3105 (2010)

Authors:

LHCb Collaboration, R Aaij, C Abellan Beteta, B Adeva, M Adinolfi, C Adrover, A Affolder, M Agari, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, M Alfonsi, P Alvarez Cartelle, AA Alves Jr, S Amato, Y Amhis, J Amoraal, J Anderson, R Antunes Nobrega, R Appleby, O Aquines Gutierrez, A Arefyev, L Arrabito, M Artuso, E Aslanides, G Auriemma, S Bachmann, Y Bagaturia, DS Bailey, V Balagura, W Baldini, G Barber, C Barham, RJ Barlow, S Barsuk, S Basiladze, A Bates, C Bauer, Th Bauer, A Bay, I Bediaga, T Bellunato, K Belous, I Belyaev, M Benayoun, G Bencivenni, R Bernet, RP Bernhard, M-O Bettler, M van Beuzekom, JH Bibby, S Bifani, A Bizzeti, PM Bjørnstad, T Blake, F Blanc, C Blanks, J Blouw, S Blusk, A Bobrov, V Bocci, B Bochin, E Bonaccorsi, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, E Bos, TJV Bowcock, C Bozzi, T Brambach, J van den Brand, L Brarda, J Bressieux, S Brisbane, M Britsch, NH Brook, H Brown, S Brusa, A Büchler-Germann, A Bursche, J Buytaert, S Cadeddu, JM Caicedo Carvajal, O Callot, M Calvi, M Calvo Gomez, A Camboni, W Cameron, L Camilleri, P Campana, A Carbone, G Carboni, R Cardinale, A Cardini, J Carroll, L Carson, K Carvalho Akiba, G Casse, M Cattaneo, B Chadaj, M Charles, Ph Charpentier, J Cheng, N Chiapolini, A Chlopik, J Christiansen, P Ciambrone, X Cid Vidal, PJ Clark, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Coca, V Coco, J Cogan, P Collins, A Comerma-Montells, F Constantin, G Conti, A Contu, P Cooke, M Coombes, B Corajod, G Corti, GA Cowan, R Currie, B D'Almagne, C D'Ambrosio, I D'Antone, W Da Silva, E Dane', P David, I De Bonis, S De Capua, M De Cian, F De Lorenzi, JM De Miranda, L De Paula, P De Simone, D Decamp, G Decreuse, H Degaudenzi, M Deissenroth, L Del Buono, CJ Densham, C Deplano, O Deschamps, F Dettori, J Dickens, H Dijkstra, M Dima, S Donleavy, P Dornan, D Dossett, A Dovbnya, R Dumps, F Dupertuis, L Dwyer, R Dzhelyadin, C Eames, S Easo, U Egede, V Egorychev, S Eidelman, D van Eijk, F Eisele, S Eisenhardt, L Eklund, DG d'Enterria, D Esperante Pereira, L Estève, E Fanchini, C Färber, G Fardell, C Farinelli, S Farry, V Fave, G Felici, V Fernandez Albor, M Ferro-Luzzi, S Filippov, C Fitzpatrick, W Flegel, F Fontanelli, C Forti, R Forty, C Fournier, B Franek, M Frank, C Frei, M Frosini, JL Fungueirino Pazos, S Furcas, A Gallas Torreira, D Galli, M Gandelman, P Gandini, Y Gao, J-C Garnier, L Garrido, D Gascon, C Gaspar, A Gaspar De Valenzuela Cue, J Gassner, N Gauvin, P Gavillet, M Gersabeck, T Gershon, Ph Ghez, V Gibson, Yu Gilitsky, VV Gligorov, C Göbel, D Golubkov, A Golutvin, A Gomes, G Gong, H Gong, H Gordon, M Grabalosa Gándara, V Gracco, R Graciani Diaz, LA Granado Cardoso, E Graugés, G Graziani, A Grecu, S Gregson, G Guerrer, B Gui, E Gushchin, Yu Guz, Z Guzik, T Gys, G Haefeli, SC Haines, T Hampson, S Hansmann-Menzemer, R Harji, N Harnew, PF Harrison, J He, K Hennessy, P Henrard, JA Hernando Morata, E van Herwijnen, A Hicheur, E Hicks, HJ Hilke, W Hofmann, K Holubyev, P Hopchev, W Hulsbergen, P Hunt, T Huse, RS Huston, D Hutchcroft, F Iacoangeli, V Iakovenko, C Iglesias Escudero, C Ilgner, J Imong, R Jacobsson, M Jahjah Hussein, O Jamet, E Jans, F Jansen, P Jaton, B Jean-Marie, M John, D Johnson, CR Jones, B Jost, F Kapusta, TM Karbach, A Kashchuk, S Katvars, J Keaveney, U Kerzel, T Ketel, A Keune, S Khalil, B Khanji, YM Kim, M Knecht, S Koblitz, A Konoplyannikov, P Koppenburg, M Korolev, A Kozlinskiy, L Kravchuk, R Kristic, G Krocker, P Krokovny, F Kruse, K Kruzelecki, M Kucharczyk, I Kudryashov, S Kukulak, R Kumar, T Kvaratskheliya, VN La Thi, D Lacarrere, A Lai, RW Lambert, G Lanfranchi, C Langenbruch, T Latham, R Le Gac, J-P Lees, R Lefèvre, A Leflat, J Lefrançois, F Lehner, M Lenzi, O Leroy, T Lesiak, L Li, YY Li, L Li Gioi, J Libby, M Lieng, R Lindner, S Lindsey, C Linn, B Liu, G Liu, S Löchner, JH Lopes, E Lopez Asamar, N Lopez-March, P Loveridge, J Luisier, B M'charek, F Machefert, IV Machikhiliyan, F Maciuc, O Maev, J Magnin, A Maier, S Malde, RMD Mamunur, G Manca, G Mancinelli, N Mangiafave, U Marconi, R Märki, J Marks, G Martellotti, A Martens, L Martin, D Martinez Santos, A Massaferri, Z Mathe, C Matteuzzi, V Matveev, E Maurice, B Maynard, A Mazurov, G McGregor, R McNulty, C Mclean, M Merk, J Merkel, M Merkin, R Messi, FCD Metlica, S Miglioranzi, M-N Minard, G Moine, S Monteil, D Moran, J Morant, JV Morris, J Moscicki, R Mountain, I Mous, F Muheim, R Muresan, F Murtas, B Muryn, M Musy, J Mylroie-Smith, P Naik, T Nakada, R Nandakumar, J Nardulli, A Nawrot, M Nedos, M Needham, N Neufeld, P Neustroev, M Nicol, L Nicolas, S Nies, V Niess, N Nikitin, A Noor, A Oblakowska-Mucha, V Obraztsov, S Oggero, O Okhrimenko, R Oldeman, M Orlandea, A Ostankov, J Palacios, M Palutan, J Panman, A Papadelis, A Papanestis, M Pappagallo, C Parkes, CJ Parkinson, G Passaleva, GD Patel, M Patel, SK Paterson, GN Patrick, C Patrignani, E Pauna, C Pauna, C Pavel, A Pazos Alvarez, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, DL Perego, E Perez Trigo, A Pérez-Calero Yzquierdo, P Perret, G Pessina, A Petrella, A Petrolini, E Picatoste Olloqui, B Pie Valls, D Piedigrossi, B Pietrzyk, D Pinci, S Playfer, M Plo Casasus, M Poli-Lener, G Polok, A Poluektov, E Polycarpo, D Popov, B Popovici, S Poss, C Potterat, A Powell, S Pozzi, T du Pree, V Pugatch, A Puig Navarro, W Qian, JH Rademacker, B Rakotomiaramanana, I Raniuk, G Raven, S Redford, W Reece, AC dos Reis, S Ricciardi, J Riera, K Rinnert, DA Roa Romero, P Robbe, E Rodrigues, F Rodrigues, C Rodriguez Cobo, P Rodriguez Perez, GJ Rogers, V Romanovsky, E Rondan Sanabria, M Rosello, G Rospabe, J Rouvinet, L Roy, T Ruf, H Ruiz, C Rummel, V Rusinov, G Sabatino, JJ Saborido Silva, N Sagidova, P Sail, B Saitta, T Sakhelashvili, C Salzmann, A Sambade Varela, M Sannino, R Santacesaria, R Santinelli, E Santovetti, M Sapunov, A Sarti, C Satriano, A Satta, T Savidge, M Savrie, D Savrina, P Schaack, M Schiller, S Schleich, M Schmelling, B Schmidt, O Schneider, T Schneider, A Schopper, M-H Schune, R Schwemmer, A Sciubba, M Seco, A Semennikov, K Senderowska, N Serra, J Serrano, B Shao, M Shapkin, I Shapoval, P Shatalov, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, A Shires, S Sigurdsson, E Simioni, HP Skottowe, T Skwarnicki, N Smale, A Smith, AC Smith, NA Smith, K Sobczak, FJP Soler, A Solomin, P Somogy, F Soomro, B Souza De Paula, B Spaan, A Sparkes, E Spiridenkov, P Spradlin, A Srednicki, F Stagni, S Stahl, S Steiner, O Steinkamp, O Stenyakin, S Stoica, S Stone, B Storaci, U Straumann, N Styles, M Szczekowski, P Szczypka, T Szumlak, S T'Jampens, E Tarkovskiy, E Teodorescu, H Terrier, F Teubert, C Thomas, E Thomas, J van Tilburg, V Tisserand, M Tobin, S Topp-Joergensen, MT Tran, S Traynor, U Trunk, A Tsaregorodtsev, N Tuning, A Ukleja, O Ullaland, U Uwer, V Vagnoni, G Valenti, A Van Lysebetten, R Vazquez Gomez, P Vazquez Regueiro, S Vecchi, JJ Velthuis, M Veltri, K Vervink, B Viaud, I Videau, D Vieira, X Vilasis-Cardona, J Visniakov, A Vollhardt, D Volyanskyy, D Voong, A Vorobyev, An Vorobyev, H Voss, K Wacker, S Wandernoth, J Wang, DR Ward, AD Webber, D Websdale, M Whitehead, D Wiedner, L Wiggers, G Wilkinson, MP Williams, M Williams, FF Wilson, J Wishahi, M Witek, W Witzeling, ML Woodward, SA Wotton, K Wyllie, Y Xie, F Xing, Z Yang, G Ybeles Smit, R Young, O Yushchenko, M Zeng, L Zhang, Y Zhang, A Zhelezov, E Zverev

Abstract:

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.
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