scholarly journals Heavy Quark Symmetry and Fine Structure of the Spectrum of Hadronic Dark Matter

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1906
Author(s):  
Vladimir Kuksa ◽  
Vitaly Beylin
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Heavy Quark ◽  
Excited States ◽  
Hyperfine Splitting ◽  
Mass Splitting ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Heavy Mesons ◽  
Heavy Quark Symmetry

We analyze the structure of excited states of new heavy hadrons in the scenario with hadronic dark matter. Fine mass-splitting in a doublet of new mesons stipulates the existence of charged metastable heavy mesons. We describe the structure of new meson excited states in the framework of the heavy quark effective theory. Phenomenological consequences of fine and hyperfine splitting are considered in the hadronic dark matter scenario and beyond.

scholarly journals Importance of Nonperturbative QCD Parameters for Bottom Mesons

2014 ◽  
Vol 2014 ◽  
pp. 1-4
Author(s):  
A. Upadhyay ◽  
M. Batra
Keyword(s):  
Heavy Quark ◽  
Mass Splitting ◽  
Bottom Meson ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Flavor Symmetries ◽  
Fitted Parameter ◽  
Nonperturbative Qcd ◽  
Meson States ◽  
Theory Formula

The importance of nonperturbative quantum chromodynamics (QCD) parameters is discussed in context to the predicting power for bottom meson masses and isospin splitting. In the framework of heavy quark effective theory, the work presented here focuses on the different allowed values of the two nonperturbative QCD parameters used in heavy quark effective theory formula, and using the best fitted parameter, masses of the excited bottom meson states injp=1/2+doublet in strange and nonstrange sectors are calculated here. The calculated masses are found to be matching well with experiments and other phenomenological models. The mass splitting and hyperfine splitting have also been analyzed for both strange and nonstrange heavy mesons with respect to spin and flavor symmetries.

scholarly journals Covariant light-front model of heavy mesons within heavy quark effective theory

1998 ◽  
Vol 57 (9) ◽  
pp. 5598-5610 ◽  
Author(s):  
Hai-Yang Cheng ◽  
Chi-Yee Cheung ◽  
Chien-Wen Hwang ◽  
Wei-Min Zhang
Keyword(s):  
Heavy Quark ◽  
Light Front ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Heavy Mesons ◽  
Front Model

scholarly journals Identifying the Λb(6146)0 and Λb(6152)0 as D-Wave Bottom Baryons

Universe ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 86
Author(s):  
Qiang Mao ◽  
Hua-Xing Chen ◽  
Hui-Min Yang
Keyword(s):  
Quantum Chromodynamics ◽  
Heavy Quark ◽  
Light Cone ◽  
Sum Rules ◽  
Mass Splitting ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Qcd Sum Rules ◽  
Decay Properties ◽  
D Wave

We study the Λ b ( 6146 ) 0 and Λ b ( 6152 ) 0 recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of J P = 3 / 2 + and 5 / 2 + respectively, both of which contain two λ -mode excitations. We also investigate other possible assignments containing ρ -mode excitations. We extract all the parameters that are necessary to study their decay properties when using the method of light-cone sum rules. We predict masses of their strangeness partners to be m Ξ b ( 3 / 2 + ) = 6.26 − 0.14 + 0.11 GeV and m Ξ b ( 5 / 2 + ) = 6.26 − 0.14 + 0.11 GeV with the mass splitting Δ M = m Ξ b ( 5 / 2 + ) − m Ξ b ( 3 / 2 + ) = 4.5 − 1.5 + 1.9 MeV, and propose to search for them in future CMS, EIC, and LHCb experiments.

scholarly journals Exothermic dark matter for XENON1T excess

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Hyun Min Lee
Keyword(s):  
Dark Matter ◽  
Mass Difference ◽  
Mass Splitting ◽  
Effective Theory ◽  
Recoil Energy ◽  
Detector Resolution ◽  
Atomic Excitation ◽  
Microscopic Models ◽  
Electron Recoil ◽  
Two Component

Abstract Motivated by the recent excess in the electron recoil from XENON1T experiment, we consider the possibility of exothermic dark matter, which is composed of two states with mass splitting. The heavier state down-scatters off the electron into the lighter state, making an appropriate recoil energy required for the Xenon excess even for the standard Maxwellian velocity distribution of dark matter. Accordingly, we determine the mass difference between two component states of dark matter to the peak electron recoil energy at about 2.5 keV up to the detector resolution, accounting for the recoil events over ER = 2 − 3 keV, which are most significant. We include the effects of the phase-space enhancement and the atomic excitation factor to calculate the required scattering cross section for the Xenon excess. We discuss the implications of dark matter interactions in the effective theory for exothermic dark matter and a massive Z′ mediator and provide microscopic models realizing the required dark matter and electron couplings to Z′.

Mass level of heavy flavored hadrons in the heavy-quark effective theory

1993 ◽  
Vol 59 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Toshiaki Ito ◽  
Toshiyuki Morii ◽  
Morimitsu Tanimoto
Keyword(s):  
Heavy Quark ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Mass Level

Baryon sum rules in the heavy quark effective theory

1993 ◽  
Vol 301 (2-3) ◽  
pp. 243-248 ◽  
Author(s):  
E. Bagan ◽  
M. Chabab ◽  
H.G. Dosch ◽  
S. Narison
Keyword(s):  
Heavy Quark ◽  
Sum Rules ◽  
Effective Theory ◽  
Heavy Quark Effective Theory

scholarly journals High-precisionfBsand heavy quark effective theory from relativistic lattice QCD

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
C. McNeile ◽  
C. T. H. Davies ◽  
E. Follana ◽  
K. Hornbostel ◽  
G. P. Lepage ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Heavy Quark ◽  
Effective Theory ◽  
Heavy Quark Effective Theory

scholarly journals Heavy quark effective theory computation of the mass of the bottom quark

2007 ◽  
Vol 2007 (01) ◽  
pp. 007-007 ◽  
Author(s):  
Michele Della Morte ◽  
Nicolas Garron ◽  
Mauro Papinutto ◽  
Rainer Sommer
Keyword(s):  
Heavy Quark ◽  
Bottom Quark ◽  
Effective Theory ◽  
Heavy Quark Effective Theory
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