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Search for heavy neutrino decays in the BEBC beam dump experiment

Physics Letters B 160:1-3 (1985) 207-211

Authors:

AM Cooper-Sarkar, SJ Haywood, MA Parker, S Sarkar, KWJ Barnham, P Bostock, ML Faccini-Turluer, H Grässler, J Guy, PO Hulth, K Hultqvist, U Idschok, H Klein, H Kreutzmann, J Krstic, MM Mobayyen, DRO Morrison, B Nellen, M Talebzadeh, W Venus, D Vignaud, H Wachsmuth, W Wittek, B Wünsch

Abstract:

New limits on lepton mixing parameters are derived from a search for decays of heavy neutrinos in a proton beam dump experiment. The limits |Uøi|2, |Uei|2 < 10-6-10-7 are obtained for neutrino mass eigenstates vi of mass between 0.5 and 1.75 GeV, which can be produced through mixing in charmed D meson decays. This is the first such limit on |Uøi|2 for neutrino masses greater than 0.5 GeV. For the mass eigenstate v3 in particular, we obtain the limits |Uø3|2 < 10-7-10-8, |Ue3|2 < 10-9-10-10 for the mass range 150-190 MeV, assuming the v3 to be produced directly in charmed F meson decays. © 1985.
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Decay B→ψX

Physical Review Letters American Physical Society (APS) 55:12 (1985) 1248-1251

Authors:

P Haas, M Hempstead, T Jensen, H Kagan, R Kass, S Behrends, T Gentile, Jan M Guida, Joan A Guida, F Morrow, R Poling, C Rosenfeld, EH Thorndike, P Tipton, D Besson, J Green, R Namjoshi, F Sannes, P Skubic, R Stone, D Bortoletto, A Chen, M Goldberg, N Horwitz, A Jawahery, P Lubrano, GC Moneti, CG Trahern, H van Hecke, SE Csorna, L Garren, MD Mestayer, RS Panvini, GB Word, Xia Yi, MS Alam, A Bean, T Ferguson, P Avery, C Bebek, K Berkelman, E Blucher, DG Cassel, T Copie, R DeSalvo, JW DeWire, R Ehrlich, RS Galik, MGD Gilchriese, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, S Holzner, M Ito, J Kandaswamy, DL Kreinick, Y Kubota, NB Mistry, E Nordberg, M Ogg, D Peterson, D Perticone, M Pisharody, K Read, A Silverman, PC Stein, S Stone, Xu Kezun, AJ Sadoff, T Bowcock, RT Giles, J Hassard, K Kinoshita, FM Pipkin, Richard Wilson
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Inclusive particle production in the transverse momentum range between 0.25 and 40 GeV/c at the CERN collider

Zeitschrift für Physik C Particles and Fields Springer Nature 27:3 (1985) 329-339

Authors:

UA2 Collaboration, M Banner, Ph Bloch, F Bonaudi, K Borer, M Borghini, JC Chollet, AG Clark, C Conta, P Darriulat, L Di Lella, J Dines Hansen, PA Dorsaz, L Fayard, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, B Hahn, H Hänni, JR Hansen, P Hansen, T Himel, V Hungerbühler, P Jenni, O Kofoed-Hansen, E Lançon, M Livan, S Loucatos, B Madsen, P Mani, B Mansoulié, GC Mantovani, L Mapelli, B Merkel, R Møllerud, C Onions, G Parrour, F Pastore, H Plothow-Besch, M Polverel, JP Repellin, A Rimoldi, A Rothenberg, A Roussarie, G Sauvage, J Schacher, JL Siegrist, F Stocker, J Teiger, V Vercesi, A Weidberg, H Zaccone, W Zeller
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Λc Production from e+e- Annihilation in the ϒ Energy Region

Physical Review Letters American Physical Society (APS) 55:9 (1985) 923-926

Authors:

T Bowcock, RT Giles, J Hassard, K Kinoshita, FM Pipkin, Richard Wilson, P Haas, M Hempstead, T Jensen, H Kagan, R Kass, S Behrends, T Gentile, Jan M Guida, Joan A Guida, F Morrow, G Parkhurst, R Poling, C Rosenfeld, EH Thorndike, P Tipton, D Besson, J Green, R Namjoshi, F Sannes, P Skubic, R Stone, D Bartoletto, A Chen, M Goldberg, N Horwitz, A Jawahery, P Lubrano, GC Moneti, CG Trahern, H van Hecke, SE Csorna, L Garren, MD Mestayer, RS Panvini, GB Word, Xia Yi, MS Alam, A Bean, T Ferguson, P Avery, C Bebek, K Berkelman, DG Cassel, T Copie, R DeSalvo, JW DeWire, R Ehrlich, RS Galik, MGD Gilchriese, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, S Holzner, M Ito, J Kandaswamy, DL Kreinick, Y Kubota, NB Mistry, E Nordberg, M Ogg, D Peterson, D Perticone, M Pisharody, K Read, A Silverman, PC Stein, S Stone, Xu Kezun, AJ Sadoff
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Study of electron pairs below the Z0 mass produced in pp collisions at √s = 540 GeV

Physics Letters B 154:4 (1985) 338-346

Authors:

P Bagnaia, M Banner, R Battiston, P Bloch, K Borer, M Borghini, J Bürger, P Cenci, JC Chollet, AG Clark, C Conta, P Darriulat, L Di Lella, J Dines-Hansen, R Engelmann, L Fayard, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, N Harnew, T Himel, P Jenni, O Kofoed-Hansen, E Lancon, M Livan, S Loucatos, B Madsen, P Mani, B Mansoulie, GC Mantovani, L Mapelli, B Merkel, R Møllerud, C Onions, G Parrour, F Pastore, H Plothow-Besch, M Polverel, JP Repellin, A Rothenberg, A Roussarie, G Sauvage, J Schacher, JL Siegrist, G Stimpfl, F Stocker, M Swartz, J Teiger, S Tovey, V Vercesi, AR Weidberg, H Zaccone, JA Zakrzewski, W Zeller

Abstract:

From an integrated luminosity of ∫Ldt = 116 nb-1, 10events are found which contain an electron pair of mass in the range 12 < Mee < 26 GeV c2 and electron transverse momenta pTe > 5 GeV c. THe sample are described, as well as some featruyres of the The production characteristics of this sample are described, as well as some features of the estimated to be 2.2±0.6 events. The production characteristics of this sample are described, as well as some features of the associated event topology. Comparisons are made with the expectations for such electron pair production from the Drell-Yan mechanism and from the semi-leptonic decay of heavy flavours. © 1985.
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