Download or read book A Search for the Rare Decay B0 u2192 written by and published by . This book was released on 2010 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for the rare radiative decay B0 → ??, where the charged congugate mode is implied throughout. These decays are highly suppressed in the Standard Model where the branching fraction is expected to be of order 10-8. In some new physics scenarios this could be enhanced by up to an order of magnitude to 10-7. Therefore an observation of a significant signal above the Standard Model prediction could be a sign of new physics.

Download or read book Search for the Rare Decay B u2192 l l in the BaBar Experiment written by and published by . This book was released on 2006 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rare decay B → ?ll- is the simplest manifestation of a b → dl+l- flavor-changing neutral current (FCNC) process. This type of process only proceeds through penguin loop or box diagrams and is sensitive to physics at the electroweak scale. It can be used to constrain parameters of the Standard Model and its extensions. B → ?l+l- events have not yet been observed; the branching fraction is expected to be an order of magnitude smaller than the measured branching fraction for the similar B → Kl+l- decay. Using 230 million B$ar{B}$ meson pairs collected with the BABAR detector, we have done a search for the rare decay B →?l+l- . The data was produced in e+e- collision at the Y(4S) resonance in the PEP-II collider between 1999 and 2004. Four exclusive B-meson decay modes have been reconstructed: B+ → ?+l+l- and B0 → ?0l+l- , where l+ l- is either an electron pair (e+e-) or a muon pair (?+?-). We find no evidence for a signal, and we obtain upper limits on the branching fractions ?. Assuming the isospin relation ?(B+ → ?+l+l- ) 2 x ?B+/?B0 ?(B0 → ?0l+l-), we obtain an upper limit at 90% confidence level on the lepton-flavor-averaged branching fraction of B → ?l+l- to be ?(B → ?e?) 9.2 x 10sup-8 /supat 90% C.L. We have also reconstructed two control modes Bsup+/sup→ ?sup+/supesup±/sup?sup±/sup and Bsup0/sup → ?sup0/supesup±/sup?sup±/sup and we also obtain an upper limit at 90% confidence level on the lepton-flavor-violating decay B → ?e? of ?(B → ?e?) 9.2 x 10

Download or read book Search for the Rare Decay K L arrow pi 0 pi 0 mu mu written by David Graham Phillips and published by . This book was released on 2009 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for the Rare Decay K pi vv written by Daniel S Akerib and published by . This book was released on 1991 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for the Rare Decay K 223p e e written by Douglas Burt Clarke and published by . This book was released on 1973 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for the Rare Decay B0 J written by Roel Aaij and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for the Rare Decay K subscript L Right Arrow Mu e written by John Fred Ginkle and published by . This book was released on 1989 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The First Search for Rare Decay K0L pi 0 pi 0 gamma written by Douglas Alan Roberts and published by . This book was released on 1994 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for the Rare Decay B0 arrow Tau Tau at the Babar Experiment written by Christopher Thomas Potter and published by . This book was released on 2005 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for the Rare Decay mu E gamma gamma written by David Paul Grosnick and published by . This book was released on 1987 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for a Rare Decay Kappa py ny n and Axion written by Y. Asano and published by . This book was released on 1981 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A search for the rare decay K0L mu epsilon written by Scott Christian Graessle and published by . This book was released on 1998 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book E787 a Search for the Rare Decay K sup written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from the first phase of the E787 experiment and an update on the current status are presented. From the first phase the limit on the K[sup+][r-arrow][pi][sup+][nu][ovr[nu]] branching ratio is BR(K[sup+][r-arrow][pi][sup+][nu][ovr[nu]])

Download or read book A Search for the Rare Decay Ksup Yields Pisup Nubar Nu written by D. S. Akerib and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for the Rare Decay Mu E Gamma Gamma written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental search for the lepton-family number nonconserving decay, .mu. .-->. e.gamma gamma., has been conducted at the Clinton P. Anderson Meson Physics Facility (LAMPF) using the Crystal Box detector. The detector consists of a modular NaI(Tl) calorimeter, scintillator hodoscope, and a high-resolution, cylindrical drift chamber. It provides a large solid-angle for detecting three-body decays and has good resolutions in the time, position, and energy measurements to eliminate unwanted backgrounds. No evidence for .mu.+ .-->. e+.gamma gamma. is found, giving an upper limit for the branching ratio of GAMMA(.mu. .-->. e.gamma gamma.)/GAMMA(.mu. .-->. e nu anti nu) less than or equal to 7.2 x 10−11 (90% C.L.). This result is an improvement of more than two orders of magnitude in the existing limit. 109 refs., 39 figs.

Download or read book Search for the Rare Decay B0 J psi gamma in the BABAR Experiment written by Sheila McLachlin and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book E787 written by and published by . This book was released on 1996 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from the first phase of the E787 experiment and an update on the current status are presented. From the first phase the limit on the K →?+?{ovr?} branching ratio is BR(K+ →?+?{ovr?})