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Showing 1 to 18 of 18 for “"B decays"”.
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Effective field theories for inclusive B decays
In this thesis, we study inclusive decays of the B meson. These allow one to determine CKM elements precisely and to search for physics beyond the Standard Model. We use the framework of effective field theories, in particular the Soft-Collinear Effective Theory, which is a suitable method when the …
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Doubly charmed B decays with the LHCb experiment
… of $CP$ violation with doubly charmed $B$ decays. Both were performed using Run I data collected by the LHCb experiment in $pp$ collisions at the LHC. This corresponds to 1.0 fb$^{-1}$ collected at a centre-of-mass energy of 7 TeV and 2.0 fb$^{-1}$ collected at a centre-of-mass energy of 8 …
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Model-independent approaches to QCD and B decays
… the soft-collinear effective theory (SCET), to B decays with energetic hadrons in the final state. SCET separates perturbative interactions at the scales mb and ... from hadronic physics at AQCD by expanding in ratios of these scales. After a review of SCET, we construct a complete …
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B → K∗µ+µ− and Form Factors for Semi-Leptonic and Radiative B Decays
… and of these semi-leptonic and radiative B decays will play a leading role in the search for new physics (NP). A prime example is the rare decay B→K∗(→ Kπ)µ+µ−, where the many measurable quantities offer important new tests of the Standard Model and its extensions. We define sets of …
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Performance of hybrid photon detectors and studies of two-body hadronic B decays at LHCb
… describes studies relevant to measurements of B decays to hadronic final states at LHCb. The Ring Imaging Cherenkov (RICH) counters of LHCb are crucial to the performance of such measurements. They use arrays of Hybrid Photon Detectors (HPDs) as their photodetection system. Detailed results are …
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A measurement of B⁰ anti-B⁰ oscillations using fully-reconstructed hadronic B decays at BaBar
Flavor oscillations of neutral B mesons have been studied with e+e- annihilation data collected at center of mass energies near the [gamma](4S) at the PEP-II asymmetric collider with the BABAR detector. One B⁰ is fully reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the …
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Measurement of the CP Asymmetry in Semimuonic B Decays Produced in Proton-Antiproton Collisions at Center of Mass Energy= 1.96 TeV
… muon pairs originating from semileptonic decays of pairs of B hadrons. Low transverse momentum dimuon pairs are evaluated to determine B hadron content using a log likelihood fit to two-dimensional impact parameter significance templates. Corrections are made for asymmetries arising from …
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MEASUREMENT OF BRANCHING FRACTIONS OF B DECAYS TO K_1(1270) PI AND K_1(1400) PI AND DETERMINATION OF THE CKM ANGLE ALPHA FROM B0 --> A_1(1260)+/- PI-/+
… fractions of neutral and charged B meson decays to final states containing a K_1(1270) or K_1(1400) meson and a charged pion. The data, collected with the BaBar detector at the SLAC National Accelerator Laboratory, correspond to 454 million B Bbar pairs produced in e+ e- annihilation. We …
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Measurement of the ratios of the branching fractions [Beta](B⁰[sigma] --> D⁻[sigma][pi]⁺ [pi]⁺[pi]⁻)/[Beta](B⁰ --> D⁻[pi]⁺ [pi]⁺[pi]⁻) and [Beta](B⁰[sigma] --> D⁻[sigma][pi]⁺)/[Beta](B⁰ --> D⁻[pi]⁺ [pi]⁺[pi]⁻).
… track trigger we reconstruct 494 ± 28 B... decays, 8098 ± 114 B... decays, 159 ± 17 B... decays, and 3288 ± 76 B... decays. Using the world average value of the ... production ratio fs/fd = 0.259 ± 0.038, we determine the ratios of branching fractions ... where the uncertainties labeled BR …
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Analysis of B Meson Decays to Three Charged Pions
Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in the CKM matrix. They also test dynamical models for hadronic B decays. Based on a sample of 772 million BB pairs collected by the Belle …
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Observation of B⁰s - B⁻⁰s oscillations using partially reconstructed hadronic Bs decays
… contribution of partially reconstructed hadronic decays in the world's first observation of B⁰s - B⁻⁰s oscillations. The analysis is a core member of a suite of closely related studies whose combined time-dependent measurement of the B⁰s - B⁻⁰s oscillation frequency Am, is of historic …
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Untersuchung neutraler pi-Mesonen mit dem elektromagnetischen Kalorimeter des BABAR-Detektors
… pi0 per event was calculated. The results for B decays and continuum events are n(B) =2,268+-0,008+-0,115 and n(Continuum)=3,388+-0,005+-0,172, respectively. These values were compared with Monte Carlo simulations and with other analyses.
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Heavy quarks in effective field theories
… penguin amplitudes in charmless non-leptonic B-decays to light mesons, including power suppressed effects that are numerically enhanced by the chiral condensate. We compare our determination of the penguin amplitudes with the experimental results. Also, we calculate the heavy quark jet function …
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Observation of b → dγ decays and determination of |V<sub>td</sub>/V<sub>ts</sub>|
The flavor changing neutral current process b → dγ is a sensitive probe to the Standard Model of elementary particle physics. Using a sample of 386 × 10⁶ B meson pairs accumulated by the Belle detector at the KEKB e⁺e⁻ collider, we measure the branching fractions for the exclusive modes B⁻ → ρ⁻γ, …
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Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu l nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub|
… of inclusive semileptonic $B \to X_u e \nu$ decays using approximately 454 million $\Upsilon(4S) \to B \bar{B}$ decays collected during the years 1999 to 2008 with the BABAR detector. The electron energy, $E_e$, and the invariant mass squared of the electron-neutrino pair,$ q^2$, are …
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Heavy quark physics on the lattice with improved nonrelativistic actions
… spectrum and of form factors for heavy-to-light decays. In heavy-to-light decays, additional complications arise at high recoil, when the momentum of the light meson reaches a magnitude comparable to the cutoff imposed by the lattice. Discretisation errors at high recoil can be reduced by working …
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SEARCH FOR THE RARE DECAY OF A B MESON TO A K MESON AND TWO NEUTRINOS
We search for the exclusive decays B -> (K+,KS,K*+,K*0)nu nubar in a sample of 9.7 million charged and neutral B meson decays recorded by the CLEO detector at the Y(4S)resonance. The technique was one of full event reconstruction where after electing a signal B candidate the remainder of the event …
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Measurement of CP Observables in B- -> D0 K- pi+ pi- Decays
… = 8 TeV.</p> <p>The data is analyzed for the decays B- → D0 K- π+ π- and B- → D0 π- π+ π-$, </p> <p>with the D0 &rarr K+π-, K+K-, π-π+ or K-π+. </p> <p>The CP violation sensitive observables R_(CP+), A_(CP+), and R_(d,s)^± are measured, which </p> <p>are sensitive to the CKM Angle gamma.</p> …