Excited heavy mesons decay form factors in light cone QCD

Semileptonic B(Bs, Bc) decays are investigated systematically in the light-cone QCD sum rules. Special emphasis is put on the LCSR calculation on weak form factors with an adequate chiral current correlator, which turns out to be particularly effective to control the pollution by higher twist components of spectator mesons. The result for each channel depends on the distribution amplitude of the the producing meson. The leading twist distribution amplitudes of the related heavy mesons and charmonium are worked out by a model approach in the reasonable way. A practical scenario is suggested to understand the behavior of weak form factors in the whole kinematically accessible ranges. The decay widths and branching ratios are estimated for several B(Bc) decay modes of current interest.

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Light-cone sum rules for proton decay

Journal of High Energy Physics ◽

10.1007/jhep05(2021)258 ◽

2021 ◽

Vol 2021 (5) ◽

Author(s):

Ulrich Haisch ◽

Amando Hala

Keyword(s):

Lattice Qcd ◽

Light Cone ◽

Sum Rules ◽

State Of The Art ◽

Form Factors ◽

Baryon Number ◽

Proton Decay ◽

Matrix Elements ◽

Decay Channels ◽

Systematic Uncertainties

Abstract We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

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Tensor form factors of N(1535) state via light-cone QCD

Chinese Journal of Physics ◽

10.1016/j.cjph.2021.04.018 ◽

2021 ◽

Author(s):

Ulaş Özdem

Keyword(s):

Light Cone ◽

Form Factors ◽

Tensor Form

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Space- and time-like electromagnetic pion form factors in light-cone pQCD

Physics Letters B ◽

10.1016/j.physletb.2010.05.082 ◽

2010 ◽

Vol 693 (2) ◽

pp. 102-107 ◽

Cited By ~ 11

Author(s):

Jiunn-Wei Chen ◽

Hiroaki Kohyama ◽

Kazuaki Ohnishi ◽

Udit Raha ◽

Yue-Long Shen

Keyword(s):

Light Cone ◽

Form Factors ◽

Space And Time

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Strong-interaction effects on the baryon semileptonic decay form factors

Physical Review D ◽

10.1103/physrevd.37.3197 ◽

1988 ◽

Vol 37 (11) ◽

pp. 3197-3205 ◽

Cited By ~ 19

Author(s):

Larry J. Carson ◽

Robert J. Oakes ◽

Charles R. Willcox

Keyword(s):

Strong Interaction ◽

Semileptonic Decay ◽

Form Factors ◽

Interaction Effects ◽

Decay Form

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ANALYSIS OF THE $B \to K^*_2(1430), a_2(1320), f_2(1270)$ FORM-FACTORS WITH LIGHT-CONE QCD SUM RULES

Modern Physics Letters A ◽

10.1142/s0217732311037133 ◽

2011 ◽

Vol 26 (37) ◽

pp. 2761-2782 ◽

Cited By ~ 5

Author(s):

ZHI-GANG WANG

Keyword(s):

Experimental Data ◽

Light Cone ◽

B Meson ◽

Sum Rules ◽

Form Factors ◽

Distribution Amplitude ◽

Qcd Sum Rules ◽

Line Shapes ◽

The Future

In this paper, we study the [Formula: see text] form-factors with the light-cone QCD sum rules, where the B-meson light-cone distribution amplitudes are used. In calculations, we observe that the line-shapes of the B-meson light-cone distribution amplitude ϕ+(ω) have significant impacts on the values of the form-factors, and expect to obtain severe constraints on the parameters of the B-meson light-cone distribution amplitudes from the experimental data in the future.

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