B-Mesons Spectroscopy in Heavy Hadron Chiral Perturbation Theory

Physical Review D, 1992

The European Physical Journal C

Inspired by the lower statistical information in the bottom sector, in this paper, we calculate the masses and the strong decays of excited B and $$B_s$$ B s mesons in the framework of heavy quark effective theory (HQET). Using an effective chiral Lagrangian approach based on heavy quark spin-flavor and light quark chiral symmetry, we explore the flavor independent parameters $$\varDelta _F^{(c)} = \varDelta _F^{(b)}$$ Δ F ( c ) = Δ F ( b ) and $$\lambda _F^{(c)} = \lambda _F^{(b)}$$ λ F ( c ) = λ F ( b ) to calculate the masses of experimentally unknown bottom mesons. Our predictions are consistent with the available experimental results and other theoretical studies. Their strong decay to the ground state bottom mesons plus light pseudoscalar mesons is calculated in terms of the square of the couplings $$g_H$$ g H , $$g_S$$ g S , $$g_T$$ g T , $$g_X$$ g X , $$g_Y$$ g Y , and $$g_R$$ g R . The weighted average value of the couplings $$g_H$$ g H , $$g_S$$ g S and $$g_T$$ g T is obta...

International Journal of Modern Physics A, 2005

Recent progress in the theory of B-meson decays is reviewed with emphasis on the aspects related to the B-factory data.

Physical Review D, 1996

We formulate quenched chiral perturbation theory for heavy-light mesons coupled to pions, and calculate the one-loop chiral logarithmic corrections to f B , f B s , B B , and B B s . We also calculate these corrections for ''partially quenched'' theories. In both theories, the chiral logarithms ...

Physical Review D, 2000

We present lattice results for the spectrum of mesons containing one heavy quark and of baryons containing one or two heavy quarks. The calculation is done in the quenched approximation using the NRQCD formalism for the heavy quark. We analyze the dependence of the mass splittings on both the heavy and the light quark masses. Meson P -state fine structure and baryon hyperfine splittings are resolved for the first time. We fix the b quark mass using both M B and M Λ b , and our best estimate is m M S b (m M S b ) = 4.35(10)( −3 +2 )(20) GeV. The spectrum, obtained by interpolation to m b , is compared with the experimental data.

Cambridge University Press eBooks, 2023

European Physical Journal C, 1998

We compare the linear meson model and chiral perturbation theory in next to leading order in the quark mass expansion. In particular, we compute the couplings \(L_4\) – \(L_8\) of chiral perturbation theory as functions of the parameters of the linear model. They are induced by the exchange of \(0^{++}\) scalar mesons. We use a phenomenological analysis of the effective vertices of the linear model in terms of pseudoscalar meson masses and decay constants. Our results for the \(L_i\) agree with previous phenomenological estimates.

Nuclear Physics B-Proceedings Supplements, 2000

We present highlights of the spectrum of mesons and baryons calculated using NRQCD for heavy quarks and tadpole improved clover action for the light quarks.

Nuclear Physics B - Proceedings Supplements, 2009

The mass shifts of the P -wave Ds and Bs mesons due to coupling to DK and BK channels are calculated in the coupling channel model without fitting parameters. The strong mass shifts down for 0 + and 1 + ′ states have been obtained, while 1 + ′′ and 2 + states remain almost in situ. The masses of 0 + and 1 + ′ states of Bs mesons have been predicted.

Physics Reports-review Section of Physics Letters, 1997

The approximate symmetries of Quantum ChromoDynamics in the infinite heavy quark (Q = c, b) mass limit (mQ → ∞) and in the chiral limit for the light quarks (mq → 0, q = u, d, s) can be used together to build up an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry breaking terms. The effective theory includes heavy (Qq) mesons of both negative and positive parity, light pseudoscalars, as well as light vector mesons. We summarize the estimates for the parameters entering the effective lagrangian and discuss in particular some phenomenologically important couplings, such as gB * Bπ. The hyperfine splitting of heavy mesons is discussed in detail. The effective lagrangian allows for the possibility to describe consistently weak couplings of heavy (B, D) to light (π, ρ, K * , etc.) mesons. The method has however its own limitations, due to the requirement that the light meson momenta should be small, and we discuss how such limitations can be circumvented through reasonable ansatz on the form factors. Flavour conserving (e. g. B * → B γ) and flavour changing (e. g. B → K * γ) radiative decays provide another field of applications of effective lagrangians; they are discussed together with their phenomenological implications. Finally we analyze effective lagrangians describing heavy charmonium-like (QQ) mesons and their strong and electromagnetic interactions. The role of approximate heavy quark symmetries for this case and the phenomenological tests of these models are also discussed.