B-meson spectroscopy in heavy hadron chiral perturbation theory

Physical Review D, 2011

Recently the Belle collaboration discovered two resonances, Z b (10610) and Z b (10650), that lie very close to the BB * and B * B * thresholds, respectively. It is natural to suppose that these are molecular states of bottom and anti-bottom mesons. Under this assumption, we introduce an effective field theory for the Z b (10610) and Z b (10650), as well as similar unobserved states that are expected on the basis of heavy quark spin symmetry. The molecules are assumed to arise from short-range interactions that respect heavy quark spin symmetry. We use the theory to calculate line shapes in the vicinity of B (*)B(*) thresholds as well as two-body decay rates of the new bottom meson bound states. We derive new heavy quark spin symmetry predictions for the parameters appearing in the line shapes as well as the total and partial widths of the states.

EPJ Web of Conferences, 2015

Investigation of the B(bq); q = u, d meson properties is carried out using variational method within phenomenological quark antiquark potential(coulomb plus power) model using the Gaussian wave function. O (1/m) correction to the potential energy term and relativistic corrections to the kinetic energy term of the hamiltonian are incorporated. Spin-orbit, spin-spin and tensor interactions are employed to obtain the mass spectra. Various other properties such as the decay constants, e1 and m1 transitions are also obtained a

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...

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.

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.

Physical Review D, 2008

We study the B meson spectroscopy allowing the mixture of conventional P wave quark-antiquark states and four-quark components. A similar picture was used to describe the new D J and D sJ open charm mesons. The four-quark components shift the masses of some positive parity B sJ states below their corresponding isospin preserving two-meson threshold and therefore they are expected to be narrow. Electromagnetic decay widths are analyzed.

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 Letters, 2009

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.

Physical Review D, 2008

The mass shifts of the P -wave D s and B s mesons due to coupling to DK, D * K and BK, B * K channels are studied using the chiral quark-pion Lagrangian without fitting parameters. The strong mass shifts down ∼ 140 MeV and ∼ 100 MeV for D * s (0 + ) and D s (1 + ′ ) and ∼ 100 MeV for B * s (0 + ) and B s (1 + ′ ) are calculated. Two factors are essential for large mass shifts: strong coupling of the 0 + and 1 + ′ states to the S-wave decay channel, containing a Nambu-Goldstone meson, and the chiral flip transitions due to the bispinor structure of both heavy-light mesons. The masses M (B * s (0 + )) = 5695(10) MeV and M (B s (1 + ′ )) = 5730(15) MeV,very close to M (B(0 + ))