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![Download Search for the decay B° -] ηφ at the BABAR experiment PDF Online Free](https://books.google.com/books/content/images/frontcover/HXYccgAACAAJ?fife=w200-h370)
Author : Stephan Otto
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (637 download)
Download or read book Search for the decay B° -] ηφ at the BABAR experiment written by Stephan Otto and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephan Otto
Publisher :
ISBN 13 :
Total Pages : 155 pages
Book Rating : 4.:/5 (315 download)
Download or read book Search for the Decay B 0 Eta Phi at the BABAR Experiment written by Stephan Otto and published by . This book was released on 2005 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (93 download)
Download or read book Search for the Rare Decay B to Pi L+l- in the BaBar Experiment written by and published by . This book was released on 2007 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (16 download)
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
Author : Jesko Friedrich Merkel
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (837 download)
Download or read book Search for the Decay B+ -> A+1K*0 at the BABAR Experiment written by Jesko Friedrich Merkel and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mousumi Datta
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Search for the Rare Leptonic B Decay B to Tau Nu Recoiling Against B to Dstar-zero 1 Nu written by Mousumi Datta and published by . This book was released on 2005 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Search for the Decay B_1hn0 -> _j63_f63 [Eta Phi] at the BABAR Experiment PDF Online Free](https://books.google.com/books/content/images/frontcover/pvB-0AEACAAJ?fife=w200-h370)
Author : Stephan Otto
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (723 download)
Download or read book Search for the Decay B_1hn0 -> _j63_f63 [Eta Phi] at the BABAR Experiment written by Stephan Otto and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download A Search for the Decay B0-]pi0pi0 PDF Online Free](https://books.google.com/books/content/images/frontcover/FX9mnQAACAAJ?fife=w200-h370)
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (871 download)
Download or read book A Search for the Decay B0-]pi0pi0 written by and published by . This book was released on 2002 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B° 2![pi]° [pi]° by the BABAR experiment at the PEP-II asymmetric-energy B-factory at SLAC. Using approximately 88 million B{bar B} pairs collected between 1999 and 2002, we place a 90% confidence level upper limit on the branching fraction of [Beta](B° 2![pi]°[pi]°)
Author : Jesko Friedrich Merkel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (837 download)
Download or read book Search for the Decay B+ -> A+1K*0 at the BABAR Experiment written by Jesko Friedrich Merkel and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Search for the Rare Decay B0 - J/[psi]γ in the BABAR Experiment PDF Online Free](https://books.google.com/books/content/images/frontcover/7eEMogEACAAJ?fife=w200-h370)
Author : Sheila McLachlin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (891 download)
Download or read book Search for the Rare Decay B0 - J/[psi]γ 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:
Author : Racha Cheaib
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (953 download)
Download or read book A Search for the Decay of a B Meson Into a Kaon and a Tau Lepton Pair at the BaBar Experiment written by Racha Cheaib and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The flavour changing neutral current (FCNC) process , B+ → K+ [tau]+[tau]−, is highly sup-pressed in the Standard Model (SM). This decay is forbidden at tree level and only occursat lowest order via one-loop diagrams. B+ → K+ [tau]+[tau]− thus has the potential to providea stringent test of the SM and a fertile ground for new physics searches. Contributions dueto virtual particles in the loop allow one to probe, at relatively low energies, new physicsat large mass scales. We search for the rare FCNC process B+ → K+ [tau]+[tau]− using datacollected by the BABAR detector at the SLAC National Accelerator Laboratory. The BABARdata sample corresponds to a total integrated luminosity, at the energy of the [UPSILON](4S) reso-nance, of 424.4 fb−1 and 471 million BB pairs. For this search, hadronic Btag reconstructionis employed, where one B is exclusively reconstructed via one of many possible hadronicmodes. The remaining decay products in an event are then attributed to the signal B, onwhich the search for B+ → K+ [tau]+[tau]− is performed. Each [tau] is required to decay leptonically,into either an electron or a muon and the lepton neutrinos. Furthermore, a multi-variateanalysis technique (neural network) is used to select for signal events and suppress dominantbackground modes. No significant signal is observed. The resulting branching fraction ismeasured to be B(B+ → K+[tau]+[tau]−) = 1.310.66 (stat.)+0.35(sys.) × 10−3, which is consistent −0.61 −0.25with zero at the 1.9[sigma] level, with an upper limit of 2.25 ×10−3 at the 90% confidence level." --
![Download A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment PDF Online Free](https://books.google.com/books/content/images/frontcover/LcfQjwEACAAJ?fife=w200-h370)
Author : Christopher Thomas Potter
Publisher :
ISBN 13 :
Total Pages : 223 pages
Book Rating : 4.:/5 (316 download)
Download or read book A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment written by Christopher Thomas Potter and published by . This book was released on 2006 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.
![Download Search for Semileptonic Decays in the B Meson Into the [Lambda]+[subscript C] Baryon PDF Online Free](https://books.google.com/books/content/images/frontcover/PGVRAQAAMAAJ?fife=w200-h370)
Author : Tomohiko Tanabe
Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.:/5 (35 download)
Download or read book Search for Semileptonic Decays in the B Meson Into the [Lambda]+[subscript C] Baryon written by Tomohiko Tanabe and published by . This book was released on 2009 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zafar Yasin
Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.3/5 (121 download)
Download or read book Search for the Decay of a Charged B Meson to a Charged Rho Meson and a F0(980) Meson written by Zafar Yasin and published by . This book was released on 2009 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sheila McLachlin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (126 download)
Download or read book Search for the Rare Decay B0 - J/Ψγ 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:
Author :
Publisher :
ISBN 13 :
Total Pages : 235 pages
Book Rating : 4.:/5 (958 download)
Download or read book A Search for the Decay of a B Meson Into a Kaon and a Tau Lepton Pair at the BaBar Experiment written by and published by . This book was released on 2016 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flavour changing neutral current (FCNC) process, $B^+$ → $K^+ [tau]^+ [tau]^-$ highly suppressed in the Standard Model (SM). This decay is forbidden at tree level and only occurs at lowest order via one-loop diagrams.$B^+$ → $K^+ [tau]^+ [tau]^-$ thus has the potential to provide a stringent test of the SM and a fertile ground for new physics searches. Contributions due to virtual particles in the loop allow one to probe, at relatively low energies, new physics at large mass scales. We search for the rare FCNC process $B^+$ → $K^+ [tau]^+ [tau]^-$ using data collected by the BaBaR detector at the SLAC National Accelerator Laboratory. The BaBaR data sample corresponds to a total integrated luminosity, at the energy of the [Tau](4S) resonance, of 424.4 $fb^-1$ and 471 million $B\bar{B}$ pairs. For this search, hadronic $B_{tag}$ reconstruction is employed, where one B is exclusively reconstructed via one of many possible hadronic modes. The remaining decay products in an event are then attributed to the signal B, on which the search for $B^+$ → $K^+ [tau]^+ [tau]^-$ is performed. Each [tau] is required to decay leptonically, into either an electron or a muon and the lepton neutrinos. Furthermore, a multi-variate analysis technique (neural network) is used to select for signal events and suppress dominant background modes. No significant signal is observed. The resulting branching fraction is measured to be $\beta(B^+$ → $K^+ [tau]^+)$ = $1.31^{0:66}_{-0:61}$(stat.) $^{+0:35}_{-0:25}$(sys.) x 10$^{-3}$, which is consistent with zero at the 1.9[sigma] level, with an upper limit of 2.25 x 10$^{-3}$, at the 90% confidence level.
Author : Thomas Keck
Publisher : Springer
ISBN 13 : 3319982494
Total Pages : 174 pages
Book Rating : 4.3/5 (199 download)
Download or read book Machine Learning at the Belle II Experiment written by Thomas Keck and published by Springer. This book was released on 2018-12-29 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores how machine learning can be used to improve the efficiency of expensive fundamental science experiments. The first part introduces the Belle and Belle II experiments, providing a detailed description of the Belle to Belle II data conversion tool, currently used by many analysts. The second part covers machine learning in high-energy physics, discussing the Belle II machine learning infrastructure and selected algorithms in detail. Furthermore, it examines several machine learning techniques that can be used to control and reduce systematic uncertainties. The third part investigates the important exclusive B tagging technique, unique to physics experiments operating at the Υ resonances, and studies in-depth the novel Full Event Interpretation algorithm, which doubles the maximum tag-side efficiency of its predecessor. The fourth part presents a complete measurement of the branching fraction of the rare leptonic B decay “B→tau nu”, which is used to validate the algorithms discussed in previous parts.
