Accelerator Neutrinos

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The CLEO-III Ring Imaging Cherenkov Detector

(1999)

Authors:

RJ Mountain, M Artuso, R Ayad, F Azfar, A Efimov, S Kopp, G Majumder, S Schuh, T Skwarnicki, S Stone, G Viehhauser, S Anderson, A Smith, Y Kubota, E Lipeles, T Coan, J Staeck, V Fadeyev, I Volobouev, J Ye
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Measurement of the mass splittings between the bb̄χb,J(1P) states

Physical Review D Particles Fields Gravitation and Cosmology 59:3 (1999) 1-5

Authors:

KW Edwards, A Bellerive, R Janicek, DB MacFarlane, PM Patel, AJ Sadoff, R Ammar, P Baringer, A Bean, D Besson, D Coppage, C Darling, R Davis, S Kotov, I Kravchenko, N Kwak, L Zhou, S Anderson, Y Kubota, SJ Lee, JJ O'Neill, R Poling, T Riehle, A Smith, MS Alam, SB Athar, Z Ling, AH Mahmood, S Timm, F Wappler, A Anastassov, JE Duboscq, D Fujino, KK Gan, T Hart, K Honscheid, H Kagan, R Kass, J Lee, H Schwarthoff, MB Spencer, M Sung, A Undrus, A Wolf, MM Zoeller, SJ Richichi, H Severini, P Skubic, M Bishai, J Fast, JW Hinson, N Menon, DH Miller, EI Shibata, IPJ Shipsey, M Yurko, S Glenn, Y Kwon, AL Lyon, S Roberts, 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, V Shelkov, J Staeck, R Stroynowski, I Volobouev, J Ye, M Artuso, F Azfar, A Efimov, M Goldberg, D He, S Kopp, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, G Viehhauser, JC Wang, X Xing, J Bartelt, SE Csorna, V Jain, KW McLean, S Marka, R Godang, K Kinoshita, IC Lai

Abstract:

We present new measurements of photon energies and branching fractions for the radiative transitions Y(2S)→γχb(J=0,1,2)(1P). The masses of the χb states are determined from the measured radiative photon energies. The ratio of mass splittings between the χb substates, r≡(MJ=2-MJ=1)/(MJ=1-MJ=0), with M the χb mass, provides information on the nature of the bb̄ confining potential. We find r(1P)=0.542 ±0.022±0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)b(1P) states than for the χb(2P) states. ©1999 The American Physical Society.
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Comparison of Fiber Polishing Techniques

Office of Scientific and Technical Information (OSTI) (1999)

Authors:

Pierrick Hanlet, Matthew Marcus, Elizabeth Gallas
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Space charge in ionization detectors and the NA48 electromagnetic calorimeter

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 421:1-2 (1999) 75-89

Authors:

S Palestini, GD Barr, C Biino, P Calafiura, A Ceccucci, C Cerri, JC Chollet, M Cirilli, J Cogan, F Costantini, S Crépé, D Cundy, R Fantechi, L Fayard, G Fischer, A Formica, PL Frabetti, W Funk, A Gianoli, S Giudici, A Gonidec, B Gorini, G Govi, L Iconomidou-Fayard, V Kekelidze, W Kubischta, S Luitz, I Mannelli, M Martini, I Mikulec, A Norton, J Ocariz, D Schinzel, M Sozzi, G Tatishvili, A Tkatchev, G Unal, M Velasco, O Vossnack, H Wahl

Abstract:

The subject of space charge due to positive ions slowly moving in parallel plate ionization chambers is considered. A model for the degradation of the detector response is developed, with particular emphasis on electromagnetic calorimeters .The topics discussed include: (a) the stationary; (b) the time dependent cases; (c) the limit of very large space charge; (d) the electric field dependence of the electron drift velocity; (e) the effect of longitudinal development of showers; (f ) the behaviour of the average reductions of response; and (g) the non-uniformity of response for different positions of the shower axis inside the cell defined by the electrodes. The NA48 calorimeter is used as application and for comparison of results. © 1999 Elsevier Science B.V. All rights reserved.
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Evaluation of the LEP Centre-of-Mass Energy Above the W-Pair Production Threshold

ArXiv hep-ex/9901002 (1999)
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