Results 31 to 40 of about 261,774 (343)
Minimal flavored U (1') for B -meson anomalies [PDF]
, 2017 We consider an anomaly-free $U(1)'$ model with favorable couplings to heavy flavors in the Standard Model(SM), as motivated by $B$-meson anomalies at LHCb.
Ligong Bian +3 more
semanticscholar +1 more source
Lepton flavor non-universality in B-meson decays from a U(2) flavor model [PDF]
Journal of High Energy Physics, 2015 We address the recent anomalies in semi-leptonic B-meson decays using a model of fermion masses based on the U(2) flavor symmetry. The new contributions to b → sℓℓ transitions arise due to a tree-level exchange of a Z′ vector boson gauging a U(1 ...
A. Falkowski, M. Nardecchia, R. Ziegler
semanticscholar +1 more source
Low-energy effective action for pions and a dilatonic meson [PDF]
, 2016 Numerical simulations of QCD-like theories in which the number of flavors is adjusted so that the beta function is very small, but confinement and chiral symmetry breaking nevertheless take place, appear to reveal the presence of a flavor-singlet scalar ...
M. Golterman, Y. Shamir
semanticscholar +1 more source
COMPASS: meson spectroscopy and low-energy meson dynamics [PDF]
EPJ Web of Conferences, 2019 Within the broad physics programme of the COMPASS collaboration at CERN SPS, soft reactions of high-energy hadron beams on different nuclear targets are investigated.
Friedrich Jan M.
doaj +1 more source
Analysis of the b 1 meson decay in local tensor bilinear representation
Journal of High Energy Physics, 2018 We explore the validity of vector meson dominance in the radiative decay of the b 1(1235) meson. In order to explain the violation of the vector meson dominance hypothesis in this decay process, we investigate a model where the b 1 meson strongly couples
Kie Sang Jeong +2 more
doaj +1 more source
Tetraquarks in the 1/N expansion and meson-meson resonances [PDF]
, 2016 A bstractDiquarks are found to have the right degrees of freedom to describe the tetraquark poles in hidden-charm to open-charm meson-meson amplitudes. Compact tetraquarks result as intermediate states in non-planar diagrams of the 1/N expansion and the ...
L. Maiani, A. Polosa, V. Riquer
semanticscholar +1 more source
Charm meson scattering cross sections by pion and rho meson [PDF]
, 2001 Using the local flavor SU(4) gauge invariance in the limit of vanishing vector meson masses, we extend our previous study of charm meson scattering cross sections by pion and rho meson, which is based only on the pseudoscalar-pseudoscalar-vector meson ...
Baier +20 more
core +2 more sources
Tetraquark operators in lattice QCD and exotic flavour states in the charm sector
Journal of High Energy Physics, 2017 We present a general class of operators resembling compact tetraquarks which have a range of colour-flavour-spin structures, transform irreducibly under the symmetries of the lattice and respect other relevant symmetries.
Gavin K. C. Cheung +4 more
doaj +1 more source
Meson properties in magnetized quark matter [PDF]
, 2017 We study neutral and charged meson properties in magnetic field. Taking bosolization method in a two-flavor Nambu--Jona-Lasinio model, we derive effective meson Lagrangian density with minimal coupling to the magnetic field, by employing derivative ...
Ziyue Wang, P. Zhuang
semanticscholar +1 more source
Too many $X's$, $Y's$ and $Z's$? [PDF]
, 2012 A large number of new states have been reported during the last few years in charmonium spectroscopy above the charmed meson production threshold. They have been called $X's$, $Y's$, and $Z's$.
A. Valcarce +30 more
core +3 more sources