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Measurement of σΛb0/ σB̄0×B(Λb0→Λc+π-)/B(B̄0→D+π- ) in pp̄ Collisions at s=1.96TeV

Physical Review Letters 98:12 (2007)

Authors:

A Abulencia, J Adelman, T Affolder, T Akimoto, MG Albrow, D Ambrose, S Amerio, D Amidei, A Anastassov, K Anikeev, A Annovi, J Antos, M Aoki, G Apollinari, JF Arguin, T Arisawa, A Artikov, W Ashmanskas, A Attal, F Azfar, P Azzi-Bacchetta, P Azzurri, N Bacchetta, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, V Bartsch, G Bauer, F Bedeschi, S Behari, S Belforte, G Bellettini, J Bellinger, A Belloni, D Benjamin, A Beretvas, J Beringer, T Berry, A Bhatti, M Binkley, D Bisello, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, G Bolla, A Bolshov, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, S Budroni, K Burkett, G Busetto, P Bussey, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, S Carillo, D Carlsmith, R Carosi, M Casarsa, A Castro, P Catastini, D Cauz, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, G Choudalakis, SH Chuang, K Chung, WH Chung, YS Chung, M Ciljak, CI Ciobanu, MA Ciocci, A Clark

Abstract:

We present the first observation of the baryon decay Λb0→ Λc+π- followed by Λc+→pK-π+ in 106pb-1 pp̄ collisions at s=1.96TeV in the CDF experiment. In order to reduce systematic error, the measured rate for Λb0 decay is normalized to the kinematically similar meson decay B̄0→D+π- followed by D+→π+K-π+. We report the ratio of production cross sections (σ) times the ratio of branching fractions (B) for the momentum region integrated above pT>6GeV/c and pseudorapidity range |η|<1.3: σ(pp̄→Λb0X)/ σ(pp̄→B̄0X)×B(Λb0→Λc+π-)/ B(B̄0→D+π-)=0.82±0.08(stat)±0.11(syst)±0. 22[B(Λc+→pK-π+)]. © 2007 The American Physical Society.
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Measurement of sigma(Lambda_b)/sigma(B0) x B(Lambda_b->Lambda_c pi)/B(B0->Dpi) in ppbar Collisions at sqrt(s)=1.96 TeV

Physical Review Letters 98 (2007) 122002 7pp

Authors:

JC Tseng, Y Le, M Martin, P Maksimovic
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Multi-W Events at LHC from a Warped Extra Dimension with Custodial Symmetry

ArXiv hep-ph/0701158 (2007)

Authors:

Christopher Dennis, Muge Karagoz Unel, Geraldine Servant, Jeff Tseng

Abstract:

Randall-Sundrum models based on SU(2)_L * SU(2)_R with custodial symmetry are compelling frameworks for building alternative models of electroweak symmetry breaking. A particular feature of these models is the likely presence of light Kaluza-Klein fermions related to the right-handed top quark. These can be as light as a few hundred GeV and still compatible with EW precision constraints. In this article, we study the detectability of four-W final states at the LHC, which arise from the pair-production and tW decay of light Kaluza-Klein bottom quarks as well as light Kaluza-Klein quarks carrying electric charge 5/3.
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ATF extraction line laser-wire system

(2007) 1394-1396

Authors:

L Deacon, ST Boogert, GA Blair, G Boorman, A Bosco, P Karataev, L Corner, N Delerue, B Foster, F Gannaway, D Howell, M Newman, A Reichold, R Senanayake, R Walczak, A Aryshev, H Hayano, K Kubo, N Terunuma, J Urakawa

Abstract:

The ATF extraction line laser-wire (LW) aims to achieve a micron-scale laser spot size and to verify that micron-scale beam profile measurements can be performed at the International Linear Collider beam delivery system. Recent upgrades to the LW system are presented together with recent results including the first use of the LW as a beam diagnostic tool.
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Determination of the νe and total 8B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

PHYSICAL REVIEW C 75:4 (2007) ARTN 045502

Authors:

B Aharmim, QR Ahmad, SN Ahmed, RC Allen, TC Andersen, JD Anglin, G Buehler, JC Barton, EW Beier, M Bercovitch, M Bergevin, J Bigu, SD Biller, RA Black, I Blevis, RJ Boardman, J Boger, E Bonvin, MG Boulay, MG Bowler, TJ Bowles, SJ Brice, MC Browne, TV Bullard, TH Burritt, J Cameron, YD Chan, HH Chen, M Chen, X Chen, BT Cleveland, JHM Cowan, DF Cowen, GA Cox, CA Currat, X Dai, F Dalnoki-Veress, WF Davidson, H Deng, M DiMarco, PJ Doe, G Doucas, MR Dragowsky, CA Duba, FA Duncan, M Dunford, JA Dunmore, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, AP Ferraris, F Fleurot, RJ Ford, JA Formaggio, MM Fowler, K Frame, ED Frank, W Frati, N Gagnon, JV Germani, S Gil, A Goldschmidt, JTM Goon, K Graham, DR Grant, E Guillian, RL Hahn, AL Hallin, ED Hallman, AS Hamer, AA Hamian, WB Handler, RU Haq, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, R Henning, JD Hepburn, H Heron, J Hewett, A Hime, C Howard, MA Howe, M Huang, JG Hykaway, MCP Isaac, P Jagam, B Jamieson, NA Jelley, C Jillings, G Jonkmans, K Kazkaz, PT Keener, K Kirch, JR Klein, AB Knox, RJ Komar, LL Kormos, M Kos, R Kouzes, A Krueger, C Kraus, CB Krauss, T Kutter, CCM Kyba, H Labranche, R Lange, J Law, IT Lawson, M Lay, HW Lee, KT Lesko, JR Leslie, I Levine, JC Loach, W Locke, S Luoma, J Lyon, R MacLellan, S Majerus, HB Mak, J Maneira, AD Marino, R Martin, N McCauley, AB McDonald, DS McDonald, K McFarlane, S McGee, G McGregor, R Meijer Drees, H Mes, C Mifflin, KKS Miknaitis, ML Miller, G Milton, BA Moffat, B Monreal, M Moorhead, B Morrissette, CW Nally, MS Neubauer, FM Newcomer, HS Ng, BG Nickel, AJ Noble, EB Norman, VM Novikov, NS Oblath, CE Okada, HM O'Keeffe, RW Ollerhead, M Omori, JL Orrell, SM Oser, R Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, A Roberge, BC Robertson, RGH Robertson, SSE Rosendahl, JK Rowley, VL Rusu, E Saettler, A Schulke, MH Schwendener, JA Secrest, H Seifert, M Shatkay, JJ Simpson, CJ Sims, D Sinclair, P Skensved, AR Smith, MWE Smith, N Starinsky, TD Steiger, RG Stokstad, LC Stonehill, RS Storey, B Sur, R Tafirout, N Tagg, Y Takeuchi, NW Tanner, RK Taplin, M Thorman, PM Thornewell, N Tolich, PT Trent, YI Tserkovnyak, T Tsui, CD Tunnell, R Van Berg, RG Van De Water, CJ Virtue, TJ Walker, BL Wall, CE Waltham, H Wan Chan Tseung, J-X Wang, DL Wark, J Wendland, N West, JB Wilhelmy, JF Wilkerson, JR Wilson, P Wittich, JM Wouters, A Wright, M Yeh, K Zuber
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