Výsledky vyhledávání - "J. E. Horstkotte"

Observation of direct photons in ϒ and ϒ′ decays and determination of the QCD scale parameter

Publikováno v: Physics Letters B. 138:225-229

Using the CUSB detector, we have measured the high energy direct photon spectrum from ϒ and ϒ′ decays. These photons are assumed to arise from the decays ϒ,ϒ′ → γgg. We determine the ration >(gggg/>(ggg) to be 0.0299 ± 0.0059 for the ϒ a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::03347268ee57886c617be68d8a44528d
https://doi.org/10.1016/0370-2693(84)91905-1

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Observation of the LowestP-Wavebb¯Bound States

Publikováno v: Physical Review Letters. 51:160-163

In a continuing study of the spectroscopy of the bb-bar bound quark systems the discovery of the lowest P-wave bound states by observation of photons from the decays 2/sup 3/S/sub 1/(bb-bar)..--> gamma..+1/sup 3/P/sub J/(bb-bar) and 1/sup 3/P/sub j/(

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cb16036740474a929ba7a4edd077343
https://doi.org/10.1103/physrevlett.51.160

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Observation of ππ cascade decays of the ϒ″

Publikováno v: Physics Letters B. 118:453-457

Using the CUSB detector at CESR, we have observed hadronic cascade decays ϒ ″ → ( ϒ or ϒ ′) + ( π + π − or π 0 π 0 ), where ϒ ( ϒ ′) → ( e + e − or μ + μ − ). We derive branching fractions of ϒ ″ → ϒ ′ π + π − .

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6b3b27c8bfca96a24d23891024201d64
https://doi.org/10.1016/0370-2693(82)90223-4

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Limits on Higgs bosons, scalar-quarkonia, andηb’s from radiative upsilon decays

Autor: C. Yanagisawa, Dong-Chul Son, T. Zhao, C. Klopfenstein, Paolo Franzini, D. M. J. Lovelock, T. Kaarsberg, S. Youssef, Juliet Lee-Franzini, S. B. Sontz, P. M. Tuts, J. E. Horstkotte, R. D. Schamberger

Publikováno v: Physical Review D. 35:2883-2886

We have searched for monochromatic photon signals in the reaction \ensuremath{\Upsilon}(9460)\ensuremath{\rightarrow}X+\ensuremath{\gamma} in a sample of 420 000 \ensuremath{\Upsilon} decays observed in the CUSB detector. From the absence of signal w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f1d6ddd3a6fd358206e686a123bffd53
https://doi.org/10.1103/physrevd.35.2883

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Observation ofP-Wavebb¯Bound States

Publikováno v: Physical Review Letters. 49:1612-1616

The existence of $P$-wave $b\overline{b}$ bound states ${{\ensuremath{\chi}}_{b}}^{\ensuremath{'}}$ is demonstrated by observation of photons from the transition ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}\ensuremath{\rightarrow}\ensurema

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e48d5ee49e44e78eedcfaad85b85863
https://doi.org/10.1103/physrevlett.49.1612

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Observation of χb production in the exclusive reaction ϒ′→γγχb→γγϒ→γγ(e+e−orμ+μ−)

Publikováno v: Physics Letters B. 130:439-443

We report on the observation of 1 3 P J ( χ b ) production in the reaction ϒ ′→ γχ b → γγϒ → γγ (e + e − or μ + μ − ). The data were recorded with the nonmagnetic CUSB detector at the Cornell Electron Storage Ring, CESR. We obs

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8b5187c5cded54eb17e1a4ada9284af
https://doi.org/10.1016/0370-2693(83)91539-3

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A measurement of the semileptonic decay of B mesons into muons

Publikováno v: Physics Letters B. 141:271-275

We have observed muons from the semileptonic decay B → Xμν where B meson are produced in e+e− annihilations into hadrons at the γ(4S) resonance (10.58 GeV). We obtain a branching ratio of (11.2 ± 0.9 ± 1.0)% for B → Xμν. We have also mea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac623c4c8af20c40636b476bfff0161e
https://doi.org/10.1016/0370-2693(84)90215-6

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Search for Higgs scalars in upsilon decays

Publikováno v: Physics Letters B. 139:332-336

We have searched for the decay of ϒ's into a monochromatic photon accompanied by other particles as a signal for the reaction ϒ → γ +Higgs. Two different methods are presented both with null result. While we are not sensitive to the branching ra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8608938e5893b7bc335c13eccbde0792
https://doi.org/10.1016/0370-2693(84)91091-8

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Semileptonic decay of the B meson

Publikováno v: Physics Letters B. 130:444-448

Using the CUSB detector we have measured the production of electrons from the decay B→eνX. We obtain a branching ratio for B→eνX of (13.2±0.8±1.4)%. The observed energy spectrum of the electrons implies that the coupling (bc)W dominates over

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2428934aa2c3f0a8efeee565b6cc83cb
https://doi.org/10.1016/0370-2693(83)91540-x

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Observation ofB/emph>production ine+e−interactions above theb-flavor threshold

Publikováno v: Physical Review Letters. 55:36-39

We have observed production of monochromatic low-energy photons in e/sup +/e/sup -/ interactions between 10.6 and 11.2 GeV/c/sup 2/. We show that this signal is associated with the production of b-flavored meson pairs, and interpret it as due to the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::af4b1005bfed63836baf37bbc2cd3a6a
https://doi.org/10.1103/physrevlett.55.36

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