Experimental Status Of B Sd Gamma Decays PDF Download
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| Release | : 2004 |
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Download Experimental Status of B -] S(d) Gamma Decays Book in PDF, ePub and Kindle
Radiative penguin decays provide an indirect probe for physics beyond the Standard Model and contribute to the determination of the CKM matrix elements. Copious quantities of B mesons produced at the B-Factories permit precision measurements of radiative penguin decays. We review the experimental status of the radiative penguin processes b [yields] s(d)[gamma].
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| Total Pages | : 217 |
| Release | : 2010 |
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Download Measurements of B -] V Gamma Decays Book in PDF, ePub and Kindle
The standard model has been highly successful at describing current experimental data. However, extensions of the standard model predict particles that have masses at energy scales that are above the electroweak scale. The flavor-changing neutral current processes of the B meson are sensitive to the influences of these new physics contributions. These processes proceed through loop diagrams, thus allowing new physics to enter at the same order as the standard model. New physics may contribute to the enhancement or suppression of rate asymmetries or the decay rates of these processes. The transition B → V[gamma] (V = K*(892), [rho](770), [omega](782), [phi](1020)) represents radiative decays of the B meson that proceed through penguin processes. Hadronic uncertainties limit the theoretical accuracy of the prediction of the branching fractions. However, uncertainties, both theoretical and experimental, are much reduced when considering quantities involving ratios of branching fractions, such as CP or isospin asymmetries. The most dominant exclusive radiative b → s transition is B → K*[gamma]. We present the best measurements of the branching fractions, direct CP, and isospin asymmetries of B → K*[gamma]. The analogous b → d transitions are B → [rho][gamma] and B → [omega][gamma], which are suppressed by a factor of.
| Author | : Dale D. Hoppes |
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| Total Pages | : 56 |
| Release | : 1961 |
| Genre | : Beta decay |
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Download An Experimental Study of Beta Decay Using the Radiations from Oriented Nuclei Book in PDF, ePub and Kindle
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| Release | : 2004 |
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Download Studying B --] S Gamma at BABAR Using a Fully Inclusive Method Book in PDF, ePub and Kindle
The b [yields] s[gamma] decay represents a possible electromagnetic ''loop'' penguin decay of the B meson. This FCNC process is of high theoretical interest because various scenarios of new physics are expected to have contributions at the same (one loop) level as the Standard Model. The large sample of B[bar B] meson decays collected by the BaBar experiment makes a precision measurement of this rare decay possible. In conjunction with Standard Model predictions at the 10% level, it brings new physics effects into the realm of detection--or seriously constrains models that could predict them. A fully inclusive technique is presented to study the b [yields] s[gamma] transition as a function of photon energy, using 88.5 [+-] 1.0 x 10[sup 6] B[bar B] meson decays collected by the BaBar experiment in the years 2000 to 2002. The expected statistical and systematic uncertainties have been fully determined which enables first comparisons with theoretical predictions and other experimental results. It also lays the basis for the determination of the inclusive branching fraction [Beta](B [yields] X[sub s][gamma]) and the measurement of the photon energy spectrum.
| Author | : Aaron Kevin Yarritu |
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| Release | : 2010 |
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Download Measurements of B -] V Gamma Decays Book in PDF, ePub and Kindle
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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| Total Pages | : 3 |
| Release | : 2007 |
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Download Measurements of B to S Gamma Decays at BaBar Book in PDF, ePub and Kindle
We present measurements of the Branching Fraction and photon energy spectrum in B → X{sub S}[gamma] decays in a sample of 89 million B{bar B} pairs collected at the BABAR detector at Stanford Linear Accelerator Center's PEP-II asymmetric B-factory. Results from a fully-inclusive and a sum of 38 exclusive final states techniques are presented and found to be consistent with the Standard Model calculations, as well as experimental results obtained from semileptonic B → X{sub c}lv decays.
| Author | : James Griffin |
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| Total Pages | : 52 |
| Release | : 1963 |
| Genre | : Beta decay |
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Download Beta Decays and Delayed Gammas from Fission Fragments Book in PDF, ePub and Kindle
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| Total Pages | : 7 |
| Release | : 2004 |
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Download Search for B0 Decays to Invisible Final States and to Nu Nubar Gamma Book in PDF, ePub and Kindle
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].
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| Total Pages | : 7 |
| Release | : 2008 |
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Download Measurement of B \to X \gamma Decays and Determination of Book in PDF, ePub and Kindle
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.
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| Total Pages | : 65 |
| Release | : 1978 |
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Download Experimental-Series Parameters for the Decay of Multigroup Beta and Gamma Spectra from 0.1 to 1000 Seconds After a Fission Burst Book in PDF, ePub and Kindle
Accurate predictions of beta and gamma spectra as a function of time following neutron-induced fission can be made by summation calculations from the fission-product data in the Evaluated Nuclear Data File, Part B(ENDF/B), but the calculations are expensive and the data base is very large. A multigroup spectrum can be represented sufficiently accurately over a limited time range by a few-term exponential series obtained by least-squares fitting to the summation calculations. This report summarizes the preparation of such a parameter set for the Air Force Weapons Laboratory (AFWL). The set describes decay of beta and gamma spectra from 0.1 to 1000 seconds after fission of U235, U238, or Pu239 induced by fission-spectrum or 14-MeV neutrons. Fits that are as accurate as the ENDF/B data warrant can be made with five or fewer terms per energy group. An alternative set of parameters that uses the same decay constants in each group for all six combinations of isotope and neutron energy, but different amplitudes for each combination, requires only one additional term for comparable accuracy.
