scholarly journals Relativistic corrections to the form factors of Bc into S -wave charmonium

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
Ruilin Zhu ◽  
Yan Ma ◽  
Xin-Ling Han ◽  
Zhen-Jun Xiao
Keyword(s):  
Form Factors ◽  
S Wave ◽  
Relativistic Corrections

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.

scholarly journals RECENT NA48/2 RESULTS ON Ke4 AND K3π DECAYS AND DETERMINATION OF THE ππ SCATTERING LENGTHS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 488-492
Author(s):  
◽  
ANDREA BIZZETI
Keyword(s):  
Mass Spectrum ◽  
Invariant Mass ◽  
High Precision ◽  
Form Factors ◽  
Invariant Mass Spectrum ◽  
S Wave ◽  
Large Samples ◽  
Scattering Lengths

Large samples of K± → 3π and K± → π+π-e±ν (Ke4) decays have been collected by the NA48/2 experiment at CERN SPS. At the π+π- threshold, the π0π0 invariant mass spectrum of the decay K± → π±π0π0 xhibits a Wigner cusp, from which the S-wave ππ scattering lengths are extracted with high precision. The same scattering lengths are also independently determined from the accurate measurement of the form factors in the Ke4 decay K± → π+π-e±ν.

Mesonic and relativistic corrections to electromagnetic form factors of the deuteron

1985 ◽  
Vol 11 (9) ◽  
pp. L151-L157 ◽  
Author(s):  
L Mathelitsch ◽  
K Schwarz ◽  
H F K Zingl ◽  
M Kohno
Keyword(s):  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Relativistic Corrections

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.

On relativistic corrections to the S-wave pion-nucleus potential

1992 ◽  
Vol 541 (4) ◽  
pp. 578-584 ◽  
Author(s):  
V. Koch ◽  
E. Oset
Keyword(s):  
S Wave ◽  
Relativistic Corrections

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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