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Analysis Of B U2192 L Decays With Babar
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Book Synopsis Analysis of B {u2192} ?l? Decays With BaBar by :
Download or read book Analysis of B {u2192} ?l? Decays With BaBar written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the BaBar project at SLAC to study the properties of B mesons, we have carried out a study of the exclusive charmless semileptonic decay mode B → ?l?, which can be used to determine the magnitude of the Cabbibo- Kobayashi-Maskawa matrix element Vub. Using simulated event samples, this study focuses on determining criteria on variables for selection of B → ?l? signal and suppression of background from other types of BB events and continuum processes. In addition, we determine optimal cuts on variables to ensure a good neutrino reconstruction. With these selection cuts, we were able to achieve a signal-to-background ratio of 0.68 and a signal efficiency of the order of 1%. Applying these cuts to a sample of 83 million BB events recorded by BaBar in e+e– collisions at the (4S) resonance, we obtain a yield of 115 ± 19 B → ?l? decays.
Book Synopsis Analysis of B 2![omega]l[nu] Decays With BaBar by :
Download or read book Analysis of B 2![omega]l[nu] Decays With BaBar written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the BaBar project at SLAC to study the properties of B mesons, we have carried out a study of the exclusive charmless semileptonic decay mode B → [omega]l[nu], which can be used to determine the magnitude of the Cabbibo- Kobayashi-Maskawa matrix element Vub. Using simulated event samples, this study focuses on determining criteria on variables for selection of B → [omega]l[nu] signal and suppression of background from other types of BB events and continuum processes. In addition, we determine optimal cuts on variables to ensure a good neutrino reconstruction. With these selection cuts, we were able to achieve a signal-to-background ratio of 0.68 and a signal efficiency of the order of 1%. Applying these cuts to a sample of 83 million BB events recorded by BaBar in e+e- collisions at the (4S) resonance, we obtain a yield of 115 ± 19 B → [omega]l[nu] decays.
Book Synopsis Search for B {u2192} (?/?) ? Decays at BaBar by :
Download or read book Search for B {u2192} (?/?) ? Decays at BaBar written by and published by . This book was released on 2008 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present the results of the search for the decays B0/± → ?0/±? (previously observed) and B0 → ?? (for which currently only an upper limit exists). Together with B → K*? decays, B → (?/?? allow us to measure the ratio of CKM-matrix elements.
Book Synopsis Analysis of B -] Omega Lv Decays with BaBar (SULI). by : Yi-Wen Chu
Download or read book Analysis of B -] Omega Lv Decays with BaBar (SULI). written by Yi-Wen Chu and published by . This book was released on 2005 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the BaBar project at SLAC to study the properties of B mesons, we have carried out a study of the exclusive charmless semileptonic decay mode B {yields} wlv, which can be used to determine the Cabbibo-Kobayashi-Maskawa matrix element V{sub ub}. Using simulated event samples, this study focuses on determining criteria on variables for selection of B {yields} wlv signal and suppression of background from other types of B{bar B} events and continuum processes. In addition, we determine optimal cuts on variables to ensure a good neutrino reconstruction. With these selection cuts, we were able to achieve a signal-to-background ratio of 0.68 and a signal efficiency of the order of 1%. Applying these cuts to a sample of 83 million B{bar B} events recorded by BaBar in e{sup +}e{sup -} collisions at the {Upsilon}(4S) resonance, we obtain a yield of 115 {+-} 19 B {yields} wlv decays.
Book Synopsis Measurement of the Decay B{u2192} ?l? with the BaBar Detector and Determination of by :
Download or read book Measurement of the Decay B{u2192} ?l? with the BaBar Detector and Determination of written by and published by . This book was released on 2010 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the branching fraction of the exclusive charmless semileptonic decay B→ ?l?l, where l is either an electron or a muon, with the charged B meson recoiling against a tag B meson decaying in the charmed semileptonic modes B → Dl?l or B → D*l?l. The measurement is based on a dataset of 426.1 fb-1 of e+e- collisions at a CM energy of 10.58 GeV recorded with the BABAR detector at the PEP-II asymmetric B Factory located at the SLAC National Accelerator Laboratory. We also calculate the relevant B → ? hadronic form factors to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element.
Download or read book Leptonic B Decays at BaBar written by and published by . This book was released on 2003 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results on searches for the rare B decays B° → ll− (l = e or?) and B+ → K+?{bar?} in?(4S) decays. The data used in these analyses were collected with the BABAR detector at the PEP-II e+e− storage ring during the years 2000 and 2001. The B° → l+l− search was performed using an integrated luminosity of 54.4 fb−1 accumulated at the?(4S) resonance (about 60 million B{bar B} pairs) while the B+ → K+?{bar?} search was performed with 50.7 fb−1 (about 56 million B{bar B} pairs). Both analyses use an additional 6.4 fb−1 of data accumulated about 40 MeV below resonance. They see no evidence for a signal in either the B → l+l− or B → K+{nu}{bar {nu}} decay modes and set the following upper limits at the 90% CL:?(B° → e+e−)
Book Synopsis Search for the Rare Decay B {u2192} ?l+l- in the BaBar Experiment by :
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
Book Synopsis Recent Results in Electroweak B Decays from the BaBar Experiment by : Karsten Koeneke
Download or read book Recent Results in Electroweak B Decays from the BaBar Experiment written by Karsten Koeneke and published by . This book was released on 2006 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of the most recent BABAR results on electroweak penguin B decays is presented. The focus of this paper is on the measurement of observables in the decays B {yields} X{sub s}{gamma}, B {yields} K{sup (*)}l{sup +}l{sup -} B {yields} K{sub s}{sup 0}{pi}{sup 0}{gamma} (time-dependent analysis) and B {yields} ({rho}/{omega}){gamma}.
Book Synopsis Inclusive Semileptonic B Decays at BABAR. by :
Download or read book Inclusive Semileptonic B Decays at BABAR. written by and published by . This book was released on 2004 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report updates on two analyses of inclusive semileptonic B decays based on a dataset of 89 million B{bar B} events recorded with the BABAR detector at the?(4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other {bar B} meson. IN the first analysis, the measurement of the first and second moment of the hadronic mass distribution in Cabibbo-favored {bar B} → X{sub c}l{bar {nu}} decays allows for the determination of the nonperturbative parameters {bar {Lambda}} and?1 of Heavy Quark Effective Theory (HQET) and.
Book Synopsis Investigation of the Charmless Decay B±{u2192} K± K{u2213} K± Using a Dalitz Plot Analysis at BaBar by :
Download or read book Investigation of the Charmless Decay B±{u2192} K± K{u2213} K± Using a Dalitz Plot Analysis at BaBar written by and published by . This book was released on 2006 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an amplitude analysis of the B±→ K± K∓ K± Dalitz plot are presented. The analysis is made using an integrated luminosity of 210.6 fb-1, recorded by the BABAR detector at the PEP-II asymmetric B Factory. This dataset corresponds to 231.8 million B$ar{B}$ pairs.
Book Synopsis Semileptonic B Decays at BABAR. by :
Download or read book Semileptonic B Decays at BABAR. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results on semileptonic B decays obtained with the BABAR detector. The large data set accumulated at the PEP-II asymmetric-energy B-Factory allows a new measurement technique, where the hadronic decay of one B meson is fully reconstructed and the semileptonic decay of the recoiling B meson is studied. Traditional analysis techniques of inclusive and exclusive B decays complement this approach with very high statistics data samples. These measurements play an important role in the tests of the description of CP violation in the Standard Model: The determinations of the Cabibbo-Kobayashi-Maskawa matrix elements V[sub cb] and V[sub ub] provide constraints on the unitarity of the CKM triangle. Furthermore, the experimental measurement of parameters of Heavy Quark Effective Theory test the consistency of the theoretical description of semileptonic B decays.
Download or read book 夏日小品 written by and published by . This book was released on 1941 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Hadronic and Rare B Decays in BABAR. by :
Download or read book Study of Hadronic and Rare B Decays in BABAR. written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results from BaBar experiment for the measurement of inclusive and exclusive branching fractions of B mesons into final states containing J/[psi], [psi](2S) and [chi]c. The contributions of CP even and odd amplitudes in the decay B° 2!J/[psi]K*° are determined from an angular analysis. We report the measurements of the branching ratios B° 2!D* D*− and D* D*− K{sub S}°, and the study of exclusive two-body and quasi-two-body charmless decays. The branching fraction of the decay B° 2!K*°[gamma] has been determined and the corresponding CP asymmetry has been measured.
Book Synopsis BABAR Results on the Decays B -] K L+ L- and B -] K* L+ L- by :
Download or read book BABAR Results on the Decays B -] K L+ L- and B -] K* L+ L- written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary results on a search for the rare decays B 2!Kll− and B 2!K*ll− performed with the BABAR experiment at the PEP-II B Factory. The data set consists of approximately 60 million [Upsilon](4S) 2!B{bar B} decays.
Book Synopsis Study of B Decays to Open Charm Final States With the BaBar Experiment by :
Download or read book Study of B Decays to Open Charm Final States With the BaBar Experiment written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from the BaBar Collaboration in the sector of B decays to open Charm are presented. Some of the results represent new precision measurements and QCD tests, some other analysis is aimed to the study of rare decays and search for new physics. Branching fractions for the modes observed for the first time are highlighted. A few results are presented also in the baryon sector.
Download or read book BABAR B Decay Results written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data from the first run of the BABAR detector at the PEP II accelerator are presented. Measurements of many rare B decay modes are now possible using the large data sets currently being collected by BABAR. An overview of analysis techniques and results on data collected in 2000 are described.
Book Synopsis Study of the Rare Decay B --> Xs L L− at BaBar by : Ventzislav B. Koptchev
Download or read book Study of the Rare Decay B --> Xs L L− at BaBar written by Ventzislav B. Koptchev and published by . This book was released on 2004 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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