Author: University of Rochester. Dept. of Physics and Astronomy
Publisher:
ISBN:
Category :
Languages : en
Pages : 13

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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The QCD sum-rules of Shifman et al. for n-th order moments are applied to the determination of the decay constants of pseudoscalar mesons containing a heavy quark (c or b). The general case when Q2, the squared momentum transfer, is non-zero is considered. The stability of the sum-rules against variations in both Q2 and n is discussed.

Author: Hluf Negash
Publisher: GRIN Verlag
ISBN: 3346135543
Category : Science
Languages : en
Pages : 13

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Academic Paper from the year 2020 in the subject Physics - Other, , language: English, abstract: In this paper, we calculated the magnetic decay widths between two mesons containing two different heavy quarks ($c\overline{b}$) for the process of $B^{*}_{c}\rightarrow B_{c}+\gamma$, within the framework of Bethe-Salpeter approach. The calculated values are found to be in a reasonable agreement with other theoretical results.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

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Calculations of the pseudoscalar decay constant for mesons containing one heavy quark (i.e., f{sub D}, f{sub B}) are reported. Results at [beta] = 6.0 using the static-quark approximation for the heavy-quark propagator are compared to results using a propagating heavy quark with Wilson fermions at ([beta] = 6.0, [beta] = 6.1 and [beta] = 6.3). Further investigation into the dynamics governing these systems is made by measuring the Bethe-Salpeter wave function for each case. 15 refs., 5 figs., 1 tab.

Author:
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ISBN:
Category :
Languages : en
Pages : 6

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Author:
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Category :
Languages : en
Pages :

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Author: Palash B. Pal
Publisher: Taylor & Francis
ISBN: 148221699X
Category : Science
Languages : en
Pages : 816

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For graduate students unfamiliar with particle physics, An Introductory Course of Particle Physics teaches the basic techniques and fundamental theories related to the subject. It gives students the competence to work out various properties of fundamental particles, such as scattering cross-section and lifetime. The book also gives a lucid summary

Author: F. E. Close
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 500

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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 508

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Author:
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ISBN:
Category :
Languages : en
Pages :

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We compute the leptonic decay constants $f_{D^+}$, $f_{D_s}$, and $f_{K^+}$, and the quark-mass ratios $m_c/m_s$ and $m_s/m_l$ in unquenched lattice QCD. We use the MILC highly improved staggered quark (HISQ) ensembles with four dynamical quark flavors. Our primary results are $f_{D^+} = 212.6(0.4)({}^{+1.0}_{-1.2})\ \mathrm{MeV}$, $f_{D_s} = 249.0(0.3)({}^{+1.1}_{-1.5})\ \mathrm{MeV}$, and $f_{D_s}/f_{D^+} = 1.1712(10)({}^{+29}_{-32})$, where the errors are statistical and total systematic, respectively. We also obtain $f_{K^+}/f_{\pi^+} = 1.1956(10)({}^{+26}_{-18})$, updating our previous result, and determine the quark-mass ratios $m_s/m_l = 27.35(5)({}^{+10}_{-7})$ and $m_c/m_s = 11.747(19)({}^{+59}_{-43})$. When combined with experimental measurements of the decay rates, our results lead to precise determinations of the CKM matrix elements $