Author: Gregory P. DuboisPublisher:
ISBN:
Category :
Languages : en
Pages : 248
Book Description
Upper Limits on Inclusive Branching Fractions to Narrow States in Radiative J/psi Decays
Author: Gregory P. DuboisRadiative Decays of PSI(3684). [Branching Fraction, Upper Limits].
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Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Results of studies of radiative decays of psi(3684) are presented. The data for this work were obtained with the Magnetic Detector at the electron-positron storage ring SPEAR. These results indicate the existence of three states chi, with masses 3415, 3500, and 3550 MeV, produced in radiative decays of psi'. There is evidence for a fourth state with mass either 3340 or 3455 MeV. From study of the psi(3684) inclusive photon spectrum, the branching fraction for psi(3684) .-->. .gamma. chi(3415) was determined to be 7.5 +- 2.6%. Branching fraction upper limits of 1 to 4% at the 90% confidence level were obtained for monochromatic photon production above 250 MeV by psi or psi'.
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 754
Book Description
Search for Fj(2220) in Radiative J/psi Decays
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
We present a search for f{sub J}(2220) production in radiative J/[psi] 2![gamma]f{sub J}(2220) decays using 460 fb−1 of data collected with the BABAR detector at the SLAC PEP-II ee− collider. The f{sub J}(2220) is searched for in the decays to K+K− and K{sub S}°K{sub S}°. No evidence of this resonance is observed, and 90% confidence level upper limits on the product of the branching fractions for J/[psi] 2![gamma]f{sub J}(2220) and f{sub J}(2220) 2!K+K−(K{sub S}°K{sub S}°) as a function of spin and helicity are set at the level of 10−5, below the central values reported by the Mark III experiment.
High Energy Physics Index
Author: Energy Research Abstracts
Author: Rare B Decays to States Containing a J/psi
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The authors report preliminary measurements of the branching fractions for B[sup +] [yields] J/[psi][phi]K[sup +], B[sup 0] [yields] J/[psi][phi]K[sub S][sup 0], B[sup 0] [yields] J/[psi][phi], B[sup 0] [yields] J/[psi][eta] and B[sup 0] [yields] J/[psi][eta][prime] using 56 million B[bar B] events collected at the [Upsilon](4S) resonance with the BABAR detector at PEP-II. They measure branching fractions of [Beta](B[sup +] [yields] J/[psi][phi]K[sup +]) = (4.4 [+-] 1.4(stat) [+-] 0.7(syst)) x 10[sup -5] and [Beta](B[sup 0] [yields] J/[psi][phi]K[sub S][sup 0]) = (5.1 [+-] 1.9(stat) [+-] 0.9(syst)) x 10[sup -5], and set upper limits at 90% C.L. for branching fractions [Beta](B[sup 0] [yields] J/[psi][phi])
A Search for Narrow States in Radiative Upsilon Decays
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A search for new states produced in radiative UPSILON(1S) decays is accomplished by observing the inclusive photon energy spectrum. A narrow resonance in the energy spectrum indicates the existence of a new state X produced by the process UPSILON .-->. .gamma. X. The analysis is based on approximately 0.44 x 106 UPSILON(1S) events produced at the DORIS II ee− storage ring. These data were collected with the Crystal Ball detector between April 1983 and May 1986. This analysis finds no evidence for a new state, so upper limits on the branching ratio BR(UPSILON .-->. .gamma. X) are derived, assuming the state X decays primarily to high-multiplicity hadronic final states. In particular, if the state X were a minimal Higgs particle, its primary decay mode would be to the heaviest fermion-antifermion pair energetically available. For the radiative UPSILON(1S) decays studied here, the heavy fermions would be c anti c or s anti s quark states, over most of the relevant Higgs' mass range. The resulting upper limit for BR(UPSILON(1S) .-->. .gamma. X) is highly energy dependent but for X mass between 1.5 GeV and 8.0 GeV, the 90% confidence level upper limit is better than 8.0 x 10−4. For a Higgs' mass near 5.0 GeV, the upper limit is about 2.0 x 10−4 which is approximately equal to the lowest order calculation for the Wilczek mechanism. The Wilczek calculation with QCD radiative corrections predict branching ratios below the limits set here for all Higgs' masses.
Radiative Decays of the Psi Prime to All-photon Final States
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Results of studies of selected radiative decays of the psi' to charmonium and non-charmonium states which decay into photons are presented. These studies were performed using a sample of 1.8 x 106 produced psi''s collected by the Crystal Ball detector at the SPEAR electron-positron storage ring. The branching ratios of the chi0, chi2, and eta'/sub c/ to two photons have been measured to be (4.5 +- 2.2 +- 2.0) x 10−4, (9.5 +- 2.9 +- 4.5) x 10−4 (first errors statistical, second systematic), and 1 x 10−2 (90% C.L.). The signal from the decay chain psi' .--. .gamma.chi0, chi0 .-->. .pi.°.pi.° has been observed with essentially no background. Using the observed line shape of the radiative photon in this reaction, the full width of the psi0 has been found to be 8.8 +- 1.3 +- 1.5 MeV/c2. In addition, the branching ratios of the chi0 and chi2 to .pi.°.pi.° have been measured to be (3.5 +- 0.3 +- 1.2) x 10−3 and (1.2 +- 0.2 +- 0.4) x 10−3; the branching ratios of the chi0 and chi2 to eta eta have been measured to be (2.8 +- 0.9 +- 1.3) x 10−3 and (8.4 +- 4.2 +- 4.0) x 10−4. The decays of the psi' to four non-charmonium states have been investigated. The branching ratios and upper limits of these decays have been normalized to the branching ratios of the corresponding decays from the J/psi which have been measured using a sample of 2.2 x 106 produced J/psi's collected by the Crystal Ball detector. The ratios of the psi' branching ratios to the J/psi branching ratios for the final states .gamma.eta, .gamma.eta', .gamma.theta, and .gamma.f have been measured to be
Branching Fraction and Charge Asymmetry Measurements InB to J/psi Pi Pi Decays
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
The authors study the decays B° → J/???− and B+ → J/??+?°, including intermediate resonances, using a sample of 382 million B{bar B} pairs recorded by the BABAR detector at the PEP-II e+e− B factory. They measure the branching fractions?(B° → J/??°) = (2.7 ± 0.3 ± 0.17) x 10−5 and?(B+ → J/??+) = (5.0 ± 0.7 ± 0.31) x 10−5. The authors also set the following upper limits at the 90% confidence level:?(B° → J/??+?− non-resonant)