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Book Synopsis $D$ Semileptonic Form Factors and $ by :
Download or read book $D$ Semileptonic Form Factors and $ written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measured partial widths of the semileptonic decays D → Kl[nu] and D → [pi]l[nu] can be combined with the form factors calculated on the lattice to extract the CKM matrix elements.
Book Synopsis Kaon and D Meson Semileptonic Form Factors from Lattice QCD. by :
Download or read book Kaon and D Meson Semileptonic Form Factors from Lattice QCD. written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the status of on-going calculations of the $K\to\pi l\nu$ and $D\to K(\pi) l\nu$ semileptonic form factors at $q^2=0$. These form factors are important for the determination of the CKM matrix elements $\lvert{V_{us}}\rvert$ and $\lvert{V_{cs(d)}}\rvert$ respectively. This work uses the HISQ action for both valence quarks and sea quarks on MILC $N_f=2+1+1$ configurations. We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly. The $K\to\pi$ results are an update to previously published results with new data at the physical point. The $D\to K(\pi)$ results are preliminary.
Book Synopsis Semileptonic Form Factors D → Π, K [D → Pi, K] and B → Π, K [B → Pi, K] from a Fine Lattice by :
Download or read book Semileptonic Form Factors D → Π, K [D → Pi, K] and B → Π, K [B → Pi, K] from a Fine Lattice written by and published by . This book was released on 2009 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of B-->D Form Factors in the Semileptonic Decay B0-->D*lv at BaBar by : Mandeep Singh Gill
Download or read book Measurement of B-->D Form Factors in the Semileptonic Decay B0-->D*lv at BaBar written by Mandeep Singh Gill and published by . This book was released on 2004 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semileptonic Form Factor Ratio B_s-]D_s/B-]D and Its Application to BR(B0̂_s-]\mu+̂\mu-̂). by :
Download or read book Semileptonic Form Factor Ratio B_s-]D_s/B-]D and Its Application to BR(B0̂_s-]\mu+̂\mu-̂). written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a (2+1)-flavor lattice QCD calculation of the form factor ratio between the semileptonic decays {bar B}{sub s}° → D{sub s}l−{bar {nu}} and {bar B}° → D+l−{bar {nu}}. This ratio is an important theoretical input to the hadronic determination of the B meson fragmentation fraction ratio f{sub s}/f{sub d} which enters in the measurement of BR(B{sub s}° →?+?−). Small lattice spacings and high statistics enable us to simulate the decays with a dynamic final D meson of small momentum and reliably extract the hadronic matrix elements at nonzero recoil. We report our preliminary result for the form factor ratio at the corresponding momentum transfer of the two decays f0{sup (s)} (M{sub {pi}}2)/f0{sup (d)} (M{sub K}2).
Book Synopsis $D$-Meson Semileptonic Form Factors at Zero Momentum Transfer in (2+1+1)-Flavor Lattice QCD. by :
Download or read book $D$-Meson Semileptonic Form Factors at Zero Momentum Transfer in (2+1+1)-Flavor Lattice QCD. written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a calculation of the $D\to K \ell \nu$ and $D\to\pi \ell \nu$ semileptonic form factors at $q^2=0$, which enable determinations of the CKM matrix elements $\lvert{V_{cs}}\rvert$ and $\lvert{V_{cd}}\rvert$, respectively. We use gauge-field configurations generated by the MILC collaboration with four flavors of highly-improved staggered (HISQ) quarks, analyzing several ensembles including those with physical pion masses and approximate lattice spacings ranging from 0.12~fm to 0.042~fm. We also use the HISQ action for the valence quarks. We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly. We use heavy-light-meson chiral perturbation theory modified for energetic pions and kaons, and supplemented by terms to describe the lattice-spacing dependence, to obtain preliminary results at the physical point and in the continuum limit.
Book Synopsis Semileptonic Form Factors D -> Pi, K and B -> Pi, K from a Fine Lattice by : QCDSF Collaboration
Download or read book Semileptonic Form Factors D -> Pi, K and B -> Pi, K from a Fine Lattice written by QCDSF Collaboration and published by . This book was released on 2009 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamental Interactions by : Alan Astbury
Download or read book Fundamental Interactions written by Alan Astbury and published by World Scientific. This book was released on 2008 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains the latest results from the field of particle physics. The contributions cover the current status of all the Large Hadron Collider (LHC) experiments, the implications of the LHC for cosmology, and the search for dark matter and nuclear astrophysics. It also includes work on the current status of the future International Linear Collider (ILC).
Book Synopsis B Meson Semileptonic Form Factors Using Unquenched Lattice QCD by : Emel Gulez
Download or read book B Meson Semileptonic Form Factors Using Unquenched Lattice QCD written by Emel Gulez and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We present state-of-the-art unquenched lattice QCD results for B meson semileptonic decay, B [rightarrow] [pi]lv, form factors. We use gauge configurations prepared by the MILC collaboration, which include the effects of the sea quarks, the s quark and two very light quarks (u and d). We employ the nonrelativistic NRQCD action to simulate the heavy b quark and a highly improved staggered quark action (AsqTad) to simulate the sea and valence light quarks. To reduce the uncertainties, we perform matching of the heavy-light current with these highly improved actions through one loop. The perturbative matching accounts for the effects of mixing with dimension 4 operators that are O(1/M) and O(a). We extrapolate the form factors f+(q2) and f0(q2) to their values at the physical pion mass using chiral perturbation theory formulas. Integrating this result, we obtain [integral] [from] 16 GeV2 [to] q2_max [d[gamma]/dq2]d2 (V_ub)2 = 1.46(35) ps−1. Combining this with a preliminary average by the Heavy Flavor Averaging Group (HFAG'05) of recent branching fraction data for exclusive B semileptonic decays from the BaBar, Belle and CLEO collaborations, leads to V_ub = 4.22(30)(51) x 10−3.
Book Synopsis Measurement of B -] D Form Factors in the Semileptonic Decay B -] D* L Nu at BaBar by :
Download or read book Measurement of B -] D Form Factors in the Semileptonic Decay B -] D* L Nu at BaBar written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Not Provided.
Book Synopsis $B_s\to D_s/B\to D$ Semileptonic Form-Factor Ratios and Their Application to BR($B0̂_s\to \mu+̂\mu-̂$). by :
Download or read book $B_s\to D_s/B\to D$ Semileptonic Form-Factor Ratios and Their Application to BR($B0̂_s\to \mu+̂\mu-̂$). written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We calculate form-factor ratios between the semileptonic decays {bar B}° → D l−{bar {nu}} and {bar B}{sub s}° → D{sub s}+l−{bar {nu}} with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of the neutral B decays, which are needed for measurements of BR(B{sub s}° →?+?−). They use the MILC ensembles of gauge configurations with 2 + 1 flavors of sea quarks at two lattice spacings of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate their simulation results at small recoil toward maximum recoil. The results for the form-factor ratios are {line_integral}0{sup (s)} (M{sub {pi}}2)/{line_integral}0{sup (d)} (M{sub K}2) = 1.046(44){sub stat.}(15){sub syst.} and {line_integral}0{sup (s)} (M{sub {pi}}2)/{line_integral}0{sup (d)} (M{sub {pi}}2) = 1.054(47){sub stat.}(17){sub syst.}. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d ↔ s) symmetry is observed.
Book Synopsis Semileptonic Form Factors D → [pi], K and B → [pi], K from a Fine Lattice by : QCDSF Collaboration
Download or read book Semileptonic Form Factors D → [pi], K and B → [pi], K from a Fine Lattice written by QCDSF Collaboration and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visualization of Semileptonic Form Factors from Lattice QCD. by :
Download or read book Visualization of Semileptonic Form Factors from Lattice QCD. written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparisons of lattice-QCD calculations of semileptonic form factors with experimental measurements often display two sets of points, one each for lattice QCD and experiment. Here we propose to display the output of a lattice-QCD analysis as a curve and error band. This is justified, because lattice-QCD results rely in part on fitting, both for the chiral extrapolation and to extend lattice-QCD data over the full physically allowed kinematic domain. To display an error band, correlations in the fit parameters must be taken into account. For the statistical error, the correlation comes from the fit. To illustrate how to address correlations in the systematic errors, we use the Becirevic-Kaidalov parametrization of the D → [pi]l[nu] and D → Kl[nu] form factors, and a analyticity-based fit for the B → [pi]l[nu] form factor f+.
Book Synopsis Heavy Flavor And Electroweak Theory - Proceedings Of The International Symposium by : Chao-hsi Chang
Download or read book Heavy Flavor And Electroweak Theory - Proceedings Of The International Symposium written by Chao-hsi Chang and published by World Scientific. This book was released on 1996-07-29 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symposium focused on the following hot topics of particle physics, such as heavy flavor productions and decays; QCD corrections; EW symmetry breaking theories; precise tests of Standard Model and physics beyond Standard Model; CP violation and rare decays etc. There are 30 talks presented at the symposium by participants from all over the world, who are active in the forefront of the fields.
Book Synopsis Measurement of B -] D* Form Factors in the Semileptonic Decay B -] D* L Nu by :
Download or read book Measurement of B -] D* Form Factors in the Semileptonic Decay B -] D* L Nu written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a preliminary measurement of R[sub 1], and R[sub 2], and [rho][sup 2], which are the three parameters used to characterize the B [yields] D*[ell][bar [nu]][sub e] form factors (A[sub 1], V, and A[sub 2]). They use 85 x 10[sup 6] B[bar B]-pairs accumulated on the [Upsilon](4S) resonance at PEP-II. In this analysis they use the decay mode [bar B][sup 0] [yields] D[sup +]*e[sup -][bar [nu]] and its charge conjugate. The D*[sup +] is reconstructed in the channel D*[sup +] [yields] D[sup 0][pi][sup +] and the D[sup 0] in the channel D[sup 0] [yields] K[sup -][pi][sup +]. They parameterize the form factors in terms of their ratios (determined by the parameters R[sub 1] and R[sub 2]) and the common slope [rho][sup 2] in the variable w (a quantity related to the momentum transfer in the decay process). These parameters are determined via an unbinned maximum likelihood fit to the distributions in four kinematic variables (three decay angles and w). The results are R[sub 1] = 1.328 [+-] 0.055 [+-] 0.025 [+-] 0.025 and R[sub 2] = 0.920 [+-] 0.044 [+-] 0.020 [+-] 0.013 for the ratios and [rho][sup 2] = 0.769 [+-] 0.l039 [+-] 0.019 [+-] 0.032 for the slope. The stated errors are the statistical uncertainty from the data, statistical uncertainty from the size of the Monte Carlo sample and the systematic uncertainty, respectively.
Book Synopsis Semi-leptonic Form-factors from Lattice QCD. by :
Download or read book Semi-leptonic Form-factors from Lattice QCD. written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results for semi-leptonic form-factors obtained on statistical sample of 63 323 × 64 lattices at [beta] = 6.0 using quenched Wilson fermions. We find f+{sup D→Klv} (q2 = 0) = 0.73 ± 0.06, A2/A1(D → K*lv) = 0.79 ± 0.23, V/A1(D{sub s} → [phi]lv) = 1.89 ± 0.04, and A2/A1(D{sub s} {yields} [phi]lv) = 0.70 ± 0.09, where the error estimate includes statistical errors and errors due to extrapolation to q2 = 0 and to physical values of (m{sub u} + m{sub d})/2 and m{sub s}. The remaining sources of systematic errors are those due to O(a) discretization errors and those due to quenching, which our results indicate may be small. We also comment on the validity of pole-dominance in these form-factors.
Book Synopsis Hadron Form Factors by : Alexander Khodjamirian
Download or read book Hadron Form Factors written by Alexander Khodjamirian and published by CRC Press. This book was released on 2020-03-13 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the phenomenology and theory of hadron form factors in a consistent manner, deriving step-by-step the key equations, defining the form factors from the matrix elements of hadronic transitions and deriving their symmetry relations. Explained are several general concepts of particle theory and phenomenology exemplified by hadron form factors. The main emphasis here is on learning the analytical methods in particle phenomenology. Many examples of hadronic processes involving form factors are considered, from the pion electromagnetic scattering to heavy B-meson decays. In the second part of the book, modern techniques of the form factor calculation, based on the method of sum rules in the theory of strong interactions, quantum chromodynamics, are introduced in an accessible manner. This book will be a useful guide for graduate students and early-career researchers working in the field of particle phenomenology and experiments. Features: • The first book to address the phenomenology of hadron form factors at a pedagogical level in one coherent volume • Contains up-to-date descriptions of the most important form factors of the electroweak transitions investigated in particle physics experiments
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