![Measurement of the Decay of the U(1S) [Upsilon(1S)] and U(2S) [Upsilon(2S)] Resonances to Muon Pairs and Determination of the Strong Coupling Constant Using the Crystal Ball Detector PDF](https://books.google.com/books/content/images/frontcover/MiOqswEACAAJ?fife=w150-h200)
Author: Michael KobelPublisher:
ISBN:
Category :
Languages : en
Pages : 185
Book Description
Measurement of the Decay of the U(1S) [Upsilon(1S)] and U(2S) [Upsilon(2S)] Resonances to Muon Pairs and Determination of the Strong Coupling Constant Using the Crystal Ball Detector
![Measurement of the Decay of the U(1S) [Upsilon(1S)] and U(2S) [Upsilon(2S)] Resonances to Muon Pairs and Determination of the Strong Coupling Constant Using the Crystal Ball Detector PDF](https://books.google.com/books/content/images/frontcover/MiOqswEACAAJ?fife=w80-h100)
Author: Michael KobelMeasurement of the decay of the _U63(1S) [Upsilon(1S)] and _U63(2S) [Upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the crystal ball detector
![Measurement of the decay of the _U63(1S) [Upsilon(1S)] and _U63(2S) [Upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the crystal ball detector PDF](https://books.google.com/books/content/images/frontcover/q_8FGwAACAAJ?fife=w80-h100)
Author: Michael KobelMeasurement ot the decay of the Υ(1S) [upsilon(1S)] and Υ(2S) [upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the Crystal Ball detector
![Measurement ot the decay of the Υ(1S) [upsilon(1S)] and Υ(2S) [upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the Crystal Ball detector PDF](https://books.google.com/books/content/images/frontcover/fcHJzQEACAAJ?fife=w80-h100)
Author: Michael KobelMeasurement ot the decay of the _U63(1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the Crystal Ball detector
![Measurement ot the decay of the _U63(1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs and determination of the strong coupling constant using the Crystal Ball detector PDF](https://books.google.com/books/content/images/frontcover/PVPyHAAACAAJ?fife=w80-h100)
Author: Michael KobelMeasurement of the decay of the _U63 (1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs
![Measurement of the decay of the _U63 (1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs PDF](https://books.google.com/books/content/images/frontcover/SHNjzwEACAAJ?fife=w80-h100)
Author: Measurement of the decay of the _U63 (1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs
![Measurement of the decay of the _U63 (1S) [upsilon(1S)] and _U63(2S) [upsilon(2S)] resonances to muon pairs PDF](https://books.google.com/books/content/images/frontcover/EQNuHQAACAAJ?fife=w80-h100)
Author: Measurement of the Decay of the [Upsilon] (1S) and [Upsilon] (2S) Resonances to Muon Pairs
![Measurement of the Decay of the [Upsilon] (1S) and [Upsilon] (2S) Resonances to Muon Pairs PDF](https://books.google.com/books/content/images/frontcover/Pp11zQEACAAJ?fife=w80-h100)
Author: Measurement of the Decay UPSILON(2S). --]. Pi. °. Pi. °UPSILON(1S).
![Measurement of the Decay UPSILON(2S). --]. Pi. °. Pi. °UPSILON(1S). PDF](https://books.google.com/books/content/images/frontcover/2AyfAQAACAAJ?fife=w80-h100)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The hadronic transitions UPSILON(2S) .-->. .pi.°.pi. UPSILON(1S) .-->. .gamma gamma gamma gamma.ll− (l = .mu. or e) are investigated using the Crystal Ball detector. The analysis is based on 193,000 UPSILON(2S) events produced at the DORIS II ee− storage ring from November 1982 to February 1984. We observe 44 events with a muon pair and 46 events with an electron pair in the final state. The signals in both channels are relatively background free. Assuming lepton universality, we average the results for the two channels and obtain the product branching ratio B(UPSILON(2S) .-->. .pi.°.pi.°UPSILON(1S)) x B/sub ll/(UPSILON(1S)) = (2.3 +- 0.3 +- 0.3) x 10−3 where the first error is statistical and the second is systematic. Using the present world average value of B/sub ll/(UPSILON(1S)) = (2.9 +- 0.3)% we derive a branching ratio B(UPSILON(2S) .-->. .pi.°.pi.°UPSILON(1S)) = (8.0 +- 1.5)% where the statistical and systematic errors have been added in quadrature. This result is compared with previous results for the charged pion transitions UPSILON(2S) .-->. .pi.+.pi.−UPSILON(1S) and with the expectation from theory. We have also investigated the mass spectrum M/sub .pi.°.pi.°/ resulting from these decays and find a peaking toward high masses not accounted for the phase space alone. Fits to the .pi.°.pi.° mass spectrum are in quantitative agreement with previous results for the .pi.+.pi.− transitions. Angular distribution for the .pi.°.pi.° system and its decay products are presented in reference frames appropriate for analyzing the spin of the .pi.°.pi.° system, even if the initial UPSILON(1S) and the di-pion system are emitted in a relative S-wave. We find the decay distributions to be consistent with those expected for a spin zero di-pion system emitted in a relative S-wave with the UPSILON(1S).
Radiative Decays of the Upsilon (2S) Resonance
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The Crystal Ball Detector at DORIS II was used to study radiative decays of the upsilon (2S) resonance with more than twice the previously available data. The inclusive photon spectrum of hadronic upsilon (2S) decays and the exclusive channel upsilon (2S) .-->. .gamma gamma. upsilon (1S) .-->. .gamma gamma. ll− were analyzed. In the inclusive spectrum three significant photon lines at energies of E.gamma.1 = (108.2 +- 0.7 +- 4) MeV, E.gamma.1 = (127.1 +- 0.8 +- 4) MeV and E.gamma.3 = (160.0 +- 2.4 +- 4) MeV with branching fractions of (6.0 +- 0.7 +- 0.9)%, (6.6 +- 0.8 +- 1.0)%, (2.6 +- 0.7 +- 0.8)% respectively were measured. The lines are consistent with being transitions from the upsilon (2S) to the 3P2, 3P1 and 3P0 states. In addition a line at E.gamma. approx. 427 MeV was observed which is interpreted as transitions from the 3P2 1 states to the upsilon (1S). 17 references.
Radiative Decay of the Muon
Author: Eilliot BogartPublisher:
ISBN:
Category : Muons
Languages : en
Pages : 100
Book Description
The radiative decay of the muon, positive-muon to position + neutrino + e-neutrino + mu'-antineutrino was measured using muons from the Columbia University Nevis Synchrocyclotron. The positron and gamma-ray decay products were observed at relative angles near 180 degrees, using scintillation counters and two 9 in. x 10 in. NaI crystals, which enabled simultaneous measurement of the positron and gamma energies. The pulses from the crystals were displayed on oscilloscopes and photographed, and the measured amplitudes of these pulses were calibrated using the positron spectrum of the nonradiative decay. The two-dimensional energy spectrum for positrons and gammas was obtained for about 900 events, after subtraction of background. This spectrum and the measured rate, obtained by normalizing to the nonradiative decay, were compared with theoretical predictions for the radiative decay. The results were in good agreement with the theory, within statistics, for the case of pure V-A coupling. (Author).