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A Search For Invisible Decays Of The Upsilon1s
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Book Synopsis A Search for Invisible Decays of the Upsilon(1S). by :
Download or read book A Search for Invisible Decays of the Upsilon(1S). written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We search for invisible decays of the?(1S) meson using a sample of 91.4 x 106?(3S) mesons collected at the BABAR/PEP-II B Factory. We select events containing the decay?(3S) →??−?(1S) and search for evidence of an undetectable?(1S) decay recoiling against the dipion system. We set an upper limit on the branching fraction?(?(1S) → invisible)
Book Synopsis Search for Invisible Decays of the Upsilon (1S) Meson at BABAR by : Lucas O. Winstrom
Download or read book Search for Invisible Decays of the Upsilon (1S) Meson at BABAR written by Lucas O. Winstrom and published by . This book was released on 2009 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S). by :
Download or read book Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S). written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We search for single-photon decays of the?(1S) resonance,? →? + invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A°, or a pair of dark matter particles,?{bar?}. Both A° and {chi} are assumed to have zero spin. We tag?(1S) decays with a dipion transition?(2S) →??−?(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m{sub A{sup o}} ≤ 9.2GeV and m{sub {chi}} ≤ 4.5GeV in the sample of 98 x 106?(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
Book Synopsis Indirect Searches for New Physics by : Alexey A. Petrov
Download or read book Indirect Searches for New Physics written by Alexey A. Petrov and published by CRC Press. This book was released on 2021-05-04 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to discuss the search for new physics in charged leptons, neutrons, and quarks in one coherent volume. The area of indirect searches for new physics is highly topical; though no new physics particles have yet been observed directly at the Large Hadron Collider at CERN, the methods described in this book will provide researchers with the necessary tools to keep searching for new physics. It describes the lines of research that attempt to identify quantum effects of new physics particles in low-energy experiments, in addition to detailing the mathematical basis and theoretical and phenomenological methods involved in the searches, whilst making a clear distinction between model-dependent and model-independent methods employed to make predictions. This book will be a valuable guide for graduate students and early-career researchers in particle and high energy physics who wish to learn about the techniques used in modern predictions of new physics effects at low energies, whilst also serving as a reference for researchers at other levels. Key features: • Takes an accessible, pedagogical approach suitable for graduate students and those seeking an overview of this new and fast-growing field • Illustrates common theoretical trends seen in different subfields of particle physics • Valuable both for researchers in the phenomenology of elementary particles and for experimentalists
Book Synopsis Search for Axion Production in UPSILON(1S) Decays by :
Download or read book Search for Axion Production in UPSILON(1S) Decays written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for axion production in radiative UPSILON(1S) decays using the Crystal Ball detector. We find no evidence for a signal and give a new upper limit, Br(UPSILON(1S).-->.a°.gamma.)
Book Synopsis A Search for Narrow States in Radiative Upsilon Decays by :
Download or read book A Search for Narrow States in Radiative Upsilon Decays written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for Π0 --> Invisible Decays with the NA62 Experiment by : Letizia Peruzzo
Download or read book Search for Π0 --> Invisible Decays with the NA62 Experiment written by Letizia Peruzzo and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Primarily Non-interacting Decay Modes of the Upsilon by :
Download or read book Search for Primarily Non-interacting Decay Modes of the Upsilon written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The hadronic transition UPSILON(2S) .-->. .pi.°.pi.°UPSILON(1S) is utilized to search for the reactions: UPSILON(1S) .-->. non-interacting particles and UPSILON(1S) .-->. .gamma. + non-interacting particles. 44 pb−1 of UPSILON(2S) data were taken by the Crystal Ball detector at the DORIS II storage ring in order to perform this study. An upper limit of BR(UPSILON .-->. Unseen) 12% (90% C.L.), is obtained via this approach. The second process investigated involved the radiative decay of the Upsilon into non-interacting particles. 57 pb−1 of UPSILON(2S) data was available for this study. An upper limit on the branching ratio BR(UPSILON .--. .gamma. + Unseen) is measured for photon energies in the range 500 MeV E.gamma.
Download or read book Proceedings written by and published by . This book was released on 1986 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Search for Invisible Decays of Ortho-positronium by : Paolo Crivelli
Download or read book New Search for Invisible Decays of Ortho-positronium written by Paolo Crivelli and published by . This book was released on 2006 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Decay UPSILON(2S). --]. Pi. °. Pi. °UPSILON(1S). by :
Download or read book Measurement of the Decay UPSILON(2S). --]. Pi. °. Pi. °UPSILON(1S). written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? by : Roman Pasechnik
Download or read book Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? written by Roman Pasechnik and published by Frontiers Media SA. This book was released on 2020-09-03 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis A Search for Narrow States in Radiative Upsilon Decays by : Stephen T. Lowe
Download or read book A Search for Narrow States in Radiative Upsilon Decays written by Stephen T. Lowe and published by . This book was released on 1986 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for charm production in direct decays of the _u63 (1S) [upsilon(1S)] resonance by :
Download or read book Search for charm production in direct decays of the _u63 (1S) [upsilon(1S)] resonance written by and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the Physical Society of Japan by : Nihon Butsuri Gakkai
Download or read book Journal of the Physical Society of Japan written by Nihon Butsuri Gakkai and published by . This book was released on 2007 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Decays of the [Upsilon](1S) Into a Photon and Two Charged Hadrons by : Luis Breva-Newell
Download or read book Decays of the [Upsilon](1S) Into a Photon and Two Charged Hadrons written by Luis Breva-Newell and published by . This book was released on 2004 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Physics Index written by and published by . This book was released on 1990 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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