scholarly journals PARITY-EVEN AND PARITY-ODD MESONS IN COVARIANT LIGHT-FRONT APPROACH

2005 ◽  
Vol 20 (16) ◽  
pp. 3648-3650 ◽  
Author(s):  
Hai-Yang Cheng
Keyword(s):  
Form Factors ◽  
Heavy Meson ◽  
Light Front ◽  
P Wave ◽  
S Wave ◽  
Decay Constants

Decay constants and form factors for parity-even (s-wave) and parity-odd (p-wave) mesons are studied within a covariant light-front approach. The three universal Isgur-Wise functions for heavy-to-heavy meson transitions are obtained.

DECAY CONSTANTS OF S AND P WAVE MESONS

2008 ◽  
Vol 23 (21) ◽  
pp. 3263-3267 ◽  
Author(s):  
GUO-LI WANG
Keyword(s):  
P Wave ◽  
S Wave ◽  
Heavy Mesons ◽  
Decay Constants

The decay constants of S wave and P wave heavy mesons are computed by means of the relativistic (instantaneous) Salpeter equation.

scholarly journals Distribution amplitudes of heavy mesons and quarkonia on the light front

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Fernando E. Serna ◽  
Roberto Correa da Silveira ◽  
J. J. Cobos-Martínez ◽  
Bruno El-Bennich ◽  
Eduardo Rojas
Keyword(s):  
Heavy Quark ◽  
Pion Mass ◽  
Heavy Meson ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Decay Constants ◽  
Quark Sector ◽  
Pseudoscalar Mesons ◽  
Inverse Moment

AbstractThe ladder kernel of the Bethe–Salpeter equation is amended by introducing a different flavor dependence of the dressing functions in the heavy-quark sector. Compared with earlier work this allows for the simultaneous calculation of the mass spectrum and leptonic decay constants of light pseudoscalar mesons, the $$D_u$$ D u , $$D_s$$ D s , $$B_u$$ B u , $$B_s$$ B s and $$B_c$$ B c mesons and the heavy quarkonia $$\eta _c$$ η c and $$\eta _b$$ η b within the same framework at a physical pion mass. The corresponding Bethe–Salpeter amplitudes are projected onto the light front and we reconstruct the distribution amplitudes of the mesons in the full theory. A comparison with the first inverse moment of the heavy meson distribution amplitude in heavy quark effective theory is made.

Relativistic studies of the decay constants of S wave and P wave mesons

2010 ◽  
Vol 34 (2) ◽  
pp. 274-276
Author(s):  
Wang Guo-Li ◽  
Zhang Jin-Mei ◽  
Wang Zhi-Hui
Keyword(s):  
P Wave ◽  
S Wave ◽  
Decay Constants

scholarly journals A complete description of P- and S-wave contributions to the B0 → K+π−ℓ+ℓ− decay

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Marcel Algueró ◽  
Paula Alvarez Cartelle ◽  
Alexander Mclean Marshall ◽  
Pere Masjuan ◽  
Joaquim Matias ◽  
...  
Keyword(s):  
Decay Rate ◽  
Form Factors ◽  
New Physics ◽  
P Wave ◽  
Experimental Methodology ◽  
Wave Form ◽  
Decay Distribution ◽  
S Wave ◽  
Zero Crossing ◽  
Symmetry Relations

Abstract In this paper we present a detailed study of the four-body decay B0 → K+π−ℓ+ℓ−, where tensions with the Standard Model predictions have been observed. Our analysis of the decay with P- and S-wave contributions to the K+π− system develops a complete understanding of the symmetries of the distribution, in the case of massless and massive leptons. In both cases, the symmetries determine relations between the observables in the B0 → K+π−ℓ+ℓ− decay distribution. This enables us to define the complete set of observables accessible to experiments, including several that have not previously been identified. The new observables arise when the decay rate is written differentially with respect to $$ {m}_{K_{\pi }} $$ m K π . We demonstrate that experiments will be able to fit this full decay distribution with currently available data sets and investigate the sensitivity to new physics scenarios given the experimental precision that is expected in the future.The symmetry relations provide a unique handle to explore the behaviour of S-wave observables by expressing them in terms of P-wave observables, therefore minimising the dependence on poorly-known S-wave form factors. Using this approach, we construct two theoretically optimized S-wave observables and explore their sensitivity to new physics. By further exploiting the symmetry relations, we obtain the first bounds on the S-wave observables using two different methods and highlight how these relations may be used as cross-checks of the experimental methodology and the parametrization of the B0 → K+π−ℓ+ℓ− differential decay rate. We identify a zero-crossing point that would be at a common dilepton invariant mass for a subset of P- and S-wave observables, and explore the information on new physics and hadronic effects that this zero point can provide.

scholarly journals $$B_{(s)}$$ to light tensor meson form factors via LCSR in HQEFT with applications to semileptonic decays

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Ya-Bing Zuo ◽  
Chong-Xing Yue ◽  
Bo Yu ◽  
Ying-Hui Kou ◽  
Yan Chen ◽  
...  
Keyword(s):  
Heavy Quark ◽  
Light Cone ◽  
Neutral Current ◽  
Form Factors ◽  
Semileptonic Decays ◽  
Effective Field ◽  
P Wave ◽  
S Wave ◽  
Tensor Meson ◽  
Flavor Changing

AbstractIn the present work, the form factors of $$B_{(s)}$$ B ( s ) to light P-wave tensor mesons ($$a_2(1320)$$ a 2 ( 1320 ) , $$K^*_2(1430)$$ K 2 ∗ ( 1430 ) , $$f_2(1270)$$ f 2 ( 1270 ) , $$f^\prime _2(1525)$$ f 2 ′ ( 1525 ) ) are calculated via the light cone sum rules (LCSR) in the framework of heavy quark effective field theory (HQEFT). Firstly, the expressions of form factors in terms of the light cone distribution amplitudes (DAs) of tensor mesons are derived via the LCSR at the leading order of heavy quark expansion. It is found that the penguin type form factors can be obtained directly from the corresponding semileptonic ones, which is similar to the case of S-wave mesons. Considering the light tensor meson DAs to twist-3, we give the numerical results of form factors systematically. As applications, we investigate the branching ratios, longitudinal polarization fractions and forward-backward asymmetries of relevant semileptonic decays induced by charged current and flavor changing neutral current (FCNC) separately. Our results may be tested by more precise experiments in the future.

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