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Measurement Of The Decay Upsilon 2s Pi Pi Upsilon 1s

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Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

High Energy Physics Index

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Author :
language : en
Publisher:
Release Date : 1987

High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Nuclear physics categories.

Measurement Of The Decay Upsilon 2s Pi Pi Upsilon 1s

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Author :
language : en
Publisher:
Release Date : 1985

Measurement Of The Decay Upsilon 2s Pi Pi Upsilon 1s written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.

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).

A Guide To Data In Elementary Particle Physics

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Author : G. P. Yost
language : en
Publisher:
Release Date : 1986

A Guide To Data In Elementary Particle Physics written by G. P. Yost and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Information storage and retrieval systems categories.

Multiquark Hadrons

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Author : Ahmed Ali
language : en
Publisher: Cambridge University Press
Release Date : 2019-04-25

Multiquark Hadrons written by Ahmed Ali and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-25 with Science categories.

A comprehensive summary of current research into multiquark hadrons, describing them in terms of constituent quarks, gluons and compact diquarks.