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Measurement of the Helicity of W Bosons in Top-Quark Decays

ArXiv hep-ex/0511023 (2005)

Observation of the P11 state of charmonium

Physical Review D - Particles, Fields, Gravitation and Cosmology 72:9 (2005)

Authors:

P Rubin, C Cawlfield, BI Eisenstein, GD Gollin, I Karliner, D Kim, N Lowrey, P Naik, C Sedlack, M Selen, EJ White, J Williams, J Wiss, KW Edwards, D Besson, TK Pedlar, D Cronin-Hennessy, KY Gao, DT Gong, J Hietala, Y Kubota, T Klein, BW Lang, SZ Li, R Poling, AW Scott, A Smith, S Dobbs, Z Metreveli, KK Seth, A Tomaradze, P Zweber, J Ernst, AH Mahmood, H Severini, DM Asner, SA Dytman, W Love, S Mehrabyan, JA Mueller, V Savinov, Z Li, A Lopez, H Mendez, J Ramirez, GS Huang, DH Miller, V Pavlunin, B Sanghi, IPJ Shipsey, GS Adams, M Cravey, JP Cummings, I Danko, J Napolitano, Q He, H Muramatsu, CS Park, W Park, EH Thorndike, TE Coan, YS Gao, F Liu, M Artuso, C Boulahouache, S Blusk, J Butt, O Dorjkhaidav, J Li, N Menaa, R Mountain, R Nandakumar, K Randrianarivony, R Redjimi, R Sia, T Skwarnicki, S Stone, JC Wang, K Zhang, SE Csorna, G Bonvicini, D Cinabro, M Dubrovin, RA Briere, GP Chen, J Chen, T Ferguson, G Tatishvili, H Vogel, ME Watkins, JL Rosner, NE Adam, JP Alexander, K Berkelman, DG Cassel, V Crede, JE Duboscq, KM Ecklund, R Ehrlich, L Fields

Abstract:

The spin-singlet P-wave state of charmonium, hc(1P1), has been observed in the decay 蠄(2S)鈫捪0hc followed by hc鈫捨澄穋. Inclusive and exclusive analyses of the M(hc) spectrum have been performed. Two complementary inclusive analyses select either a range of energies for the photon emitted in hc鈫捨澄穋 or a range of values of M(畏c). These analyses, consistent with one another within statistics, yield M(hc)=[3524.9卤0.7(stat)卤0.4(sys)]MeV/c2 and a product of the branching ratios B蠄(蠄(2S)鈫捪0hc)脳Bh(hc鈫捨澄穋)= [3.5卤1.0(stat)卤0.7(sys)]脳10-4. When the 畏c is reconstructed in seven exclusive decay modes, 17.5卤4.5 hc events are seen with an average mass M(hc)=[3523.6卤0.9(stat)卤0.5(sys)]MeV/c2, and B蠄Bh=[5.3卤1.5(stat)卤1.0(sys)]脳10-4. If combined, the inclusive and exclusive data samples yield an overall mass M(hc)=[3524. 4卤0.6(stat)卤0.4(sys)]MeV/c2 and product of branching ratios B蠄Bh=[4.0卤0.8(stat)卤0.7(sys)]脳10-4. The hc mass implies a P-wave hyperfine splitting 螖MHF(1P)M(13P)-M(11P1)=[1.0卤0.6(stat) 卤0.4(sys)]MeV/c2. 漏 2005 The American Physical Society.

Absolute branching fraction measurements of exclusive D+ semileptonic decays

Physical Review Letters 95:18 (2005)

Authors:

GS Huang, DH Miller, V Pavlunin, B Sanghi, IPJ Shipsey, GS Adams, M Chasse, M Cravey, JP Cummings, I Danko, J Napolitano, Q He, H Muramatsu, CS Park, W Park, EH Thorndike, TE Coan, YS Gao, F Liu, M Artuso, C Boulahouache, S Blusk, J Butt, E Dambasuren, O Dorjkhaidav, J Li, N Menaa, R Mountain, R Nandakumar, K Randrianarivony, R Redjimi, R Sia, T Skwarnicki, S Stone, JC Wang, K Zhang, SE Csorna, G Bonvicini, D Cinabro, M Dubrovin, RA Briere, GP Chen, J Chen, T Ferguson, G Tatishvili, H Vogel, ME Watkins, JL Rosner, NE Adam, JP Alexander, K Berkelman, DG Cassel, V Crede, JE Duboscq, KM Ecklund, R Ehrlich, L Fields, L Gibbons, B Gittelman, R Gray, SW Gray, DL Hartill, BK Heltsley, D Hertz, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, VE Kuznetsov, H Mahlke-Kr眉ger, TO Meyer, PUE Onyisi, JR Patterson, D Peterson, EA Phillips, J Pivarski, D Riley, A Ryd, AJ Sadoff, H Schwarthoff, X Shi, MR Shepherd, S Stroiney, WM Sun, D Urner, KM Weaver, T Wilksen, M Weinberger, SB Athar, P Avery, L Breva-Newell, R Patel, V Potlia, H Stoeck, J Yelton, P Rubin, C Cawlfield, BI Eisenstein, GD Gollin, I Karliner

Abstract:

Using data collected at the 蠄(3770) resonance with the CLEO-c detector at the Cornell e+e- storage ring, we present improved measurements of the absolute branching fractions of D+ decays to K虅0e+谓e, 蟺0e+谓e, K虅*0e+谓e, and 蟻0e+谓e, and the first observation and absolute branching fraction measurement of D+鈫捪塭+谓e. We also report the most precise tests to date of isospin invariance in semileptonic D0 and D+ decays. 漏 2005 The American Physical Society.

A search for top decay into tau, neutrino and quark in top-antitop production

ArXiv hep-ex/0510063 (2005)

Search for charged Higgs bosons from top quark decays in \ppbar collisions at $\sqrt{s}=1.96$ TeV

ArXiv hep-ex/0510065 (2005)