Výsledky vyhledávání - "L. J. Spencer"

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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Observation ofϒ,ϒ′, andϒ′′at the Cornell Electron Storage Ring

Autor: S. W. Herb, Pm Tuts, K. Han, L. J. Spencer, M. Sivertz, T. Böhringer, G. Finocchiaro, G. Giannini, Leon M. Lederman, Paolo Franzini, E. Rice, G. Mageras, J. Yoh, J Dobbins, D. Peterson, Daniel M. Kaplan, R. D. Schamberger, Juliet Lee-Franzini, F. Costantini

Publikováno v: Physical Review Letters. 44:1111-1114

The UPSILON, UPSILON', and UPSILON'' states have been observed at the Cornell Electron Storage Ring as narrow peaks in sigma(e/sup +/e/sup -/ ..-->.. hadrons) versus beam energy. Data were collected during a run of 1000 nb/sup -1/, using the Columbia

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e68bd1ed8eefafe16604959011780e06
https://doi.org/10.1103/physrevlett.44.1111

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Inclusive K0 production in e+ e− annihilation at the upsilon resonances

Publikováno v: Nuclear Physics B. 206:1-11

We report on inclusive K0 production in the region of the upsilon resonances (9.4–10.6 GeV). The K0 yield for the resonances and continuum below the BB threshold is found to be constant at 0.82 ± 0.10 K0 per observed hadronic event. At the ϒ(4S),

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::464c3657a5c354f1b2b44ed8e39b4c65
https://doi.org/10.1016/0550-3213(82)90484-9

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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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Thrust distribution and decays of the ϒ bound states

Publikováno v: Physics Letters B. 114:277-281

We have studied the topologies of hadronic events in e + e - annihilation data taken in the region of the upsilon resonances with the non-magnetic CUSB detectors at CESR. Using a thrust-like variable we compare the decay of ϒ, ϒ′ and ϒPrime; fin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::697c4505187b9dd013d832940aa505d9
https://doi.org/10.1016/0370-2693(82)90495-6

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Observation of theϒ′′′at the Cornell Electron Storage Ring

Publikováno v: Physical Review Letters. 45:222-225

During an energy scan at the Cornell Electron Storage Ring, with use of the Columbia University-Stony Brook NaI detector, an enhancement in $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})$ is observed at cent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8f78644d011230b2b8a8f4ffe3ea9e4
https://doi.org/10.1103/physrevlett.45.222

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