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Measurement of the product branching fraction B(c→Θc³Ý)³Ýµþ(Θc→ÂìX)

Physical Review D Particles Fields Gravitation and Cosmology 62:9 (2000) 1-12

Authors:

R Ammar, P Baringer, P Brabant, A Bean, D Besson, H Bull, R Davis, J Holliday, S Kotov, I Kravchenko, N Kwak, I Robertson, R Stutz, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, R Mahapatra, JJ O'Neill, R Poling, T Riehle, A Smith, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, AH Mahmood, M Saleem, S Timm, F Wappler, A Anastassov, JE Duboscq, KK Gan, C Gwon, T Hart, K Honscheid, H Kagan, R Kass, J Lorenc, H Schwarthoff, E Von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, M Bishai, S Chen, J Fast, JW Hinson, J Lee, N Menon, DH Miller, EI Shibata, IPJ Shipsey, Y Kwon, AL Lyon, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, V Savinov, D Ugolini, X Zhou, TE Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, R Stroynovvski, J Ye, T Wlodek, M Artuso, R Ayad, E Dambasuren, S Kopp, G Majumder, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, A Titov, G Viehhauser, JC Wang, A Wolf, J Wu, SE Csorna, KW McLean, S Marka, Z Xu, R Godang, K Kinoshita, IC Lai, P Pomianowski, S Schrenk, G Bonvicini

Abstract:

Based on a high statistics e+e-→ccÌ„ data sample, we report on the inclusive rate for charmed baryons to decay into Âì particles using charm-event tagging. We select e+e-→ccÌ„ events which have a clear anti-charm tag and measure the Âì content in the hemisphere opposite the tag (charge conjugate modes are implicit). This allows us to determine the product branching fraction BÂì=µþ(³¦â†’Θc³Ý)³Ýµþ(Θ c→ÂìX), where Θc represents a sum over all charmed baryons produced in e+e- fragmentation at √s=10.5 GeV, given our specific tags. We obtain BÂì=(1.87±0.03±0.33)%. ©2000 The American Physical Society.

Search for decays of B0 mesons into pairs of leptons: B0↑e+e-, B0→μ+μ-, and B0→e±μ∓

Physical Review D Particles Fields Gravitation and Cosmology 62:9 (2000) 1-5

Authors:

T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, M Palmer, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, R Janicek, PM Patel, AJ Sadoff, R Ammar, A Bean, D Besson, R Davis, N Kwak, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, R Mahapatra, JJ O'Neill, R Poling, T Riehle, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, JE Duboscq, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, H Schwarthoff, JB Thayer, E Von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, S Chen, J Fast, JW Hinson, J Lee, DH Miller, EI Shibata, IPJ Shipsey, V Pavlunin, D Cronin-Hennessy, AL Lyon, EH Thorndike, CP Jessop, H Marsiske, ML Perl, V Savinov, X Zhou, TE Coan, V Fadeyev, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, R Ayad, C Boulahouache, K Bukin, E Dambasuren, S Karamov, G Majumder, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, G Viehhauser, JC Wang

Abstract:

We search for the decay of the B0 meson into a pair of leptons in the suppressed channels B0→e+e-, B0→μ+μ- and in the lepton number violating channel B0→e±μ∓ in a sample of 9.7×106 BB̄ pairs recorded by CLEO detector. No signal is found, and the following upper limits on the branching fractions are established: B(B0→e+e-)<8.3×10-7, B(B0→μ+μ-)<6.1×10 -7, B(B0→e±μ ∓)<15×10-7 at 90% confidence level. A new lower limit on the Pati-Salam leptoquark mass MLQ>27 TeV is established at 90% confidence level. © 2000 The American Physical Society.

The disc-jet connection in GRS 1915+105

(2000)

Authors:

M Klein-Wolt, RP Fender, GG Pooley, T Belloni, S Migliari, EH Morgan, M van der Klis

Energetics of jets from X-ray binaries

(2000)

A jet model for the broadband spectrum of XTE J1118+480: Synchrotron emission from radio to X-rays in the Low/Hard spectral state

(2000)

Authors:

Sera Markoff, Heino Falcke, Rob Fender