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Search For B0 Decays To Invisible Final States And To Nu Nubar Gamma
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Book Synopsis Search for B0 Decays to Invisible Final States and to Nu Nubar Gamma by :
Download or read book Search for B0 Decays to Invisible Final States and to Nu Nubar Gamma written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We establish upper limits on branching fractions for B° decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for B° decays to [nu]{bar [nu]}[gamma]. Within the Standard Model, these decays have branching fractions that are below current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions from these channels. Using 88.5 million B{bar B} pairs collected at the [Upsilon](4S) resonance by the BABAR experiment at the PEP-II ee− storage ring at the Stanford Linear Accelerator Center, we establish upper limits at the 90% confidence level of 22 x 10−5 for the branching fraction of B° 2!invisible and 4.7 x 10−5 for the branching fraction of B° 2!{nu}{bar {nu}}[gamma].
Book Synopsis Improved Limits on $B{̂0}$ Decays to Invisible $(+gamma)$ Final States by :
Download or read book Improved Limits on $B{̂0}$ Decays to Invisible $(+gamma)$ Final States written by and published by . This book was released on 2013 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We establish improved upper limits on branching fractions for B° decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for final states where the only visible product is a photon. Within the Standard Model, these decays have branching fractions that are below the current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions for these channels. Using 471 million B{bar B} pairs collected at the? (4S) resonance by the BABAR experiment at the PEP-II ee− storage ring at the SLAC National Accelerator Laboratory, we establish upper limits at the 90% confidence level of 2.4 x 10−5 for the branching fraction of B° → invisible and 1.7 x 10−5 for the branching fraction of B° → invisible +?
Book Synopsis The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector by : Dana Lindemann
Download or read book The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector written by Dana Lindemann and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the searches for two rare B meson decays: the radiative leptonic decay B+ -> l+ nu gamma (l = e, mu) and the flavor-changing neutral current B -> K(*) nu nubar. These searches use the full dataset collected by the BaBar experiment, which corresponds to almost 500 million BB pairs. After fully reconstructing the hadronic decay of one of the B mesons in Upsilon(4S) -> BB decays, evidence of B+ -> l+ nu gamma or B -> K(*) nu nubar is looked for in the rest of the event. No significant evidence of either signal decay is observed. Model-independent branching-fraction upper limits are set at BR(B ->e nu gamma)17 x10 {-6}, BR(B -mu nu gamma)24 x10 {-6}, and BR(B -l nu gamma)15.6 x10 {-6}, all at the 90% confidence level. These are currently the most stringent published upper limits for B+ - l+ nu gamma. In addition, branching-fraction upper limits are set at BR(B -> K+ nu nubar)3.7 x10 {-5}, BR(B - K0 nu nubar)8.0 x10 {-5}, BR(B - K*+ nu nubar)11.5 x10 {-5}, and BR(B - K*0 nu nubar)9.2 x10 {-5}, all at the 90% confidence level. For additional sensitivity to New Physics contributions, partial B - K(*) nu nubar branching-fraction upper limits are also determined over the full kinematic range." --
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 A Search for the Rare Decay B0 2![gamma][gamma]. by :
Download or read book A Search for the Rare Decay B0 2![gamma][gamma]. 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 → [gamma][gamma], 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.
Book Synopsis Measurement of B \to X \gamma Decays and Determination of by :
Download or read book Measurement of B \to X \gamma Decays and Determination of written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 383 million B{bar B} events collected by the BABAR experiment, they measure sums of seven exclusive final states B → X{sub d(s)}[gamma], where X{sub d}(X{sub s}) is a non-strange (strange) charmless hadronic system in the mass range 0.6-1.8 GeV/c2. After correcting for unmeasured decay modes in this mass range, they obtain a branching fraction for b → d[gamma] of (7.2 ± 2.7(stat.) ± 2.3(syst.)) x 10−6. Taking the ratio of X{sub d} to X{sub s} they find [Lambda](b → d[gamma])/[Lambda](b → s[gamma]) = 0.033 ± 0.013(stat.) ± 0.009(syst.), from which they determine.
Book Synopsis Search for the Decay B° 2!gamma-gamma by :
Download or read book Search for the Decay B° 2!gamma-gamma written by and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a limit on the branching fraction for the decay B° 2![gamma][gamma] using data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II asymmetric--energy ee− collider. Based on the observation of one event in the signal region, out of a sample of 21.3 x 106 ee− 2 2!B{bar B} decays, we establish an upper limit on the branching fraction of [Beta] (B° 2![gamma][gamma])
Book Synopsis Model-Independent Results for the Decay B \to L Nu(L) Gamma at BaBar by :
Download or read book Model-Independent Results for the Decay B \to L Nu(L) Gamma at BaBar written by and published by . This book was released on 2012 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the radiative leptonic decays B+ → e?{sub e}? and B+ →?+?{sub?}? using data collected by the BABAR detector at the PEP-II B factory. We fully reconstruct the hadronic decay of one of the B mesons in?(4S) → B+B− and then search for evidence of the signal decay within the rest of the event. This method provides clean kinematic information on the signal's missing energy and high momentum photon and lepton, and allows for a model-independent analysis of this decay. Using a data sample of 465 million B-meson pairs, we obtain sensitivity to branching fractions of the same order as predicted by the Standard Model. We report a model-independent branching fraction upper limit of?(B+ → l+?{sub l}?)
Book Synopsis Search for the Decay D0 -] [gamma][gamma] and Measurement of the Decay D0 -] [pi]0 [pi]0 by : James Paul Morris
Download or read book Search for the Decay D0 -] [gamma][gamma] and Measurement of the Decay D0 -] [pi]0 [pi]0 written by James Paul Morris and published by . This book was released on 2009 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The Standard Model is the best current description of fundamental interactions and particles; however, the Standard Model has certain shortcomings which have driven particle physicists for the last 30 years to search for phenomena which provide evidence for the next theory beyond the Standard Model. To this end, using the BaBar detector, we search for evidence of the rare decay D* -> D0[pi];D0->[gamma][gamma]. The branching fraction of this decay is enhanced up to 200 times the standard model prediction in certain beyond-the-Standard-Model theories. A measurement of a significant branching fraction would provide evidence for a new theory of particle physics. We describe our search for this rare decay and an improved measurement of the associated decay, B(D0-> [pi]0 [pi]0) using an integrated luminosity corresponding to 470.5 fb−1 of e e− data collected by the BaBar detector at the PEP-II asymmetric ee− collider at SLAC from 1999-2007. We place an upper limit of B(D0->[gamma][gamma]) 2.51 X 10−6 at 90% confidence level and find B(D0-[pi]0[pi]0) = (8.4 " 0.1 " 0.4 " 0.3) X 10−4.
Book Synopsis Study of B to X \gamma Decays and Determination of by :
Download or read book Study of B to X \gamma Decays and Determination of written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 471 million B{bar B} events collected with the BABAR detector, we study the sum of seven exclusive final states B → X{sub s(d)[gamma]}, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 GeV/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b → d[gamma] of (9.2 ± 2.0(stat.) ± 2.3(syst.)) x 10−6 in this mass range, and a branching fraction for b → s[gamma] of (23.0 ± 0.8(stat.) ± 3.0(syst.)) x 10−5 in the same mass range. We find [Beta](b→d[gamma])/[Beta](b→s{gamma}) = 0.040 ± 0.009(stat.) ± 0.010(syst.), from which we determine.
Book Synopsis Gensicke, Hellmuth. Die Rittergeschlechter Von Nackenheim by :
Download or read book Gensicke, Hellmuth. Die Rittergeschlechter Von Nackenheim written by and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Decay B[sup 0][yields] Gamma-gamma by :
Download or read book Search for the Decay B[sup 0][yields] Gamma-gamma written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a limit on the branching fraction for the decay B[sup 0][yields][gamma][gamma] using data collected at the[Upsilon](4S) resonance with the BABAR detector at the PEP-II asymmetric--energy e[sup+]e[sup -] collider. Based on the observation of one event in the signal region, out of a sample of 21.3 x 10[sup 6] e[sup+]e[sup -][yields][Upsilon](4S)[yields] B[bar B] decays, we establish an upper limit on the branching fraction of[Beta] (B[sup 0][yields][gamma][gamma])
Book Synopsis Search for B \to K(*)nunubar and Invisible Quarkonium Decays by :
Download or read book Search for B \to K(*)nunubar and Invisible Quarkonium Decays written by and published by . This book was released on 2013 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Rare Leptonic Decay B- -] Tau- Nubar by :
Download or read book Search for the Rare Leptonic Decay B- -] Tau- Nubar 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 a search for the decay B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] in a sample of 88.9 x 10[sup 6] B[bar B]pairs recorded with the BABAR detector at the SLAC B-Factory. One of the two B mesons from the [Upsilon](4S) is reconstructed in a hadronic or a semileptonic final state and the decay products of the other B in the event are analyzed for consistency with a B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] decay. We find no evidence of a signal and set an upper limit on the branching fraction of [Beta](B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]])
Book Synopsis A Search for the Rare Decay $B\rightarrow\gamma\gamma$ by :
Download or read book A Search for the Rare Decay $B\rightarrow\gamma\gamma$ written by and published by . This book was released on 2011 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the result of a search for the rare decay B° 2![gamma][gamma] in 426 fb−1 of data, corresponding to 226 million B°{bar B}° pairs, collected on the [Upsilon](4S) resonance at the PEP-II asymmetric-energy ee− collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 2112{sup +13} signal events with a statistical signficance of 1.9 [sigma]. This corresponds to a branching fraction [Beta](B° 2![gamma][gamma]) = (1.7 ± 1.1(stat.) ± 0.2(syst.)) x 10−7. Based on this result, we set a 90% confidence level upper limit of [Beta](B° 2![gamma][gamma])
Book Synopsis Search for D0 -> Nu Nu-bar and B0 -> P Lambda-bar Pi- Gamma Decay at Belle, and Belleii Cdctrg System Firmware Design by : 賴昀樅
Download or read book Search for D0 -> Nu Nu-bar and B0 -> P Lambda-bar Pi- Gamma Decay at Belle, and Belleii Cdctrg System Firmware Design written by 賴昀樅 and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of B -] V Gamma Decays by : Aaron Kevin Yarritu
Download or read book Measurements of B -] V Gamma Decays written by Aaron Kevin Yarritu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Observational evidence and theoretical motivation have led us to the conclusion that our current understanding of the universe is incomplete. While new physics is expected to exist above the electroweak scale, its influence can be detected by experiments that operate below this scale. The Babar experiment has recorded approximately 432 fb-1 of data at the center of mass energy of 10.58 GeV, which corresponds to the Y(4S) mass. One of the physics programs is studying radiative decays of the B meson. These decays primarily proceed through loop diagrams, and thus influences of new particles may be detectable. In this thesis, I present results of the measurements of the branching fractions, CP asymmetry, and isospin asymmetry of B -> K* gamma. Results are also presented for the measurements of the branching fractions of B -> rho(omega) gamma. Finally, a search for the decay of B -> phi gamma is given.
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