scholarly journals Pion andη-meson mass splitting at the two-flavor chiral crossover

2016 ◽  
Vol 94 (7) ◽  
Author(s):  
Markus Heller ◽  
Mario Mitter
Keyword(s):  
Mass Splitting ◽  
Meson Mass

Symmetries of quark-antiquark scattering and meson mass-splitting

1967 ◽  
Vol 49 (1) ◽  
pp. 51-60 ◽  
Author(s):  
J. Stern ◽  
A. Vančura
Keyword(s):  
Mass Splitting ◽  
Meson Mass

scholarly journals Holographic meson mass splitting in the nuclear matter

2013 ◽  
Vol 2013 (8) ◽  
Author(s):  
Bum-Hoon Lee ◽  
Shahin Mamedov ◽  
Siyoung Nam ◽  
Chanyong Park
Keyword(s):  
Nuclear Matter ◽  
Mass Splitting ◽  
Meson Mass

$B^0_{d,s}-\bar{B}^0_{d,s}$ MIXING IN THE MODEL III 2HDM

2005 ◽  
Vol 20 (01) ◽  
pp. 161-174 ◽  
Author(s):  
CHAO-SHANG HUANG ◽  
JIAN-TAO LI
Keyword(s):  
B Meson ◽  
New Physics ◽  
Mass Splitting ◽  
High Accuracy ◽  
Time Dependent ◽  
Meson Mass ◽  
Leading Order ◽  
Cp Asymmetry ◽  
Neutral B Meson ◽  
Accuracy Data

In the model III 2HDM there are new CP violating phases which would affect the [Formula: see text] mixing. In this paper, we calculate the new physics contributions to the neutral B meson mass splitting ΔMBq (q=d,s) at the next-to-leading order (NLO) level. Using the high accuracy data and other relevant data, we draw the constraints on the parameter space of the model III 2HDM. Moreover, we calculate the new physics corrections to the ratio q/p. It is found that the phase of (q/p)n for Bd which is due to the new contributions is very small and consequently in agreement with the measurements of the time dependent CP asymmetry SJ/ψK in B→J/ψKS. On the contrary, the phase of (q/p)n for Bs is large enough to give significant effects on CP violation in the neutral Bs system.

scholarly journals Nucleon mass splitting in the isospin medium

2014 ◽  
Vol 29 (29) ◽  
pp. 1450170 ◽  
Author(s):  
Bum-Hoon Lee ◽  
Shahin Mamedov ◽  
Chanyong Park
Keyword(s):  
Mass Splitting ◽  
Meson Mass ◽  
Nucleon Mass ◽  
Unitary Gauge ◽  
Gauge Fixing ◽  
Pion Nucleon ◽  
Charged Mesons

Using the AdS/CFT correspondence, we investigate a nucleon mass splitting and pion–nucleon coupling in the isospin medium. We find that there exists a nucleon mass splitting which is exactly given by the half of the meson mass splitting because nucleon has the half isospin charge of the charged mesons. In addition, we also investigate the pion–nucleon and four pion interactions which requires the modification of the known Abelian-type unitary gauge fixing because of the non-Abelian structure of the isospin medium. After finding the non-Abelian unitary gauge fixing, we find that in the isospin medium the couplings only for π0 π0 π+ π- and π0 π0π0 π0 of four pion interactions shift, while there is no pion–nucleon coupling splitting in spite of the nucleon's and meson's mass splittings.

Spectral-Function Sum Rules and Meson Mass Splitting

1968 ◽  
Vol 170 (5) ◽  
pp. 1376-1378 ◽  
Author(s):  
L. Clavelli ◽  
G. Venturi
Keyword(s):  
Spectral Function ◽  
Sum Rules ◽  
Mass Splitting ◽  
Meson Mass

scholarly journals The ω–ρ meson mass splitting and mixing from lattice QCD

2009 ◽  
Vol 674 (4-5) ◽  
pp. 286-290 ◽  
Author(s):  
C. McNeile ◽  
C. Michael ◽  
C. Urbach
Keyword(s):  
Lattice Qcd ◽  
Mass Splitting ◽  
Meson Mass

scholarly journals Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark matter

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Amin Aboubrahim ◽  
Michael Klasen ◽  
Pran Nath
Keyword(s):  
Dark Matter ◽  
Particle Physics ◽  
Small Mass ◽  
Big Bang ◽  
Mass Splitting ◽  
Recoil Energy ◽  
Dirac Fermions ◽  
Dark Sector ◽  
Dark Photon ◽  
Physics Model

Abstract We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a U(1) extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays before the big bang nucleosynthesis, which leads to the dark matter constituted of two essentially mass degenerate Dirac fermions. The Xenon-1T excess is computed via the inelastic exothermic scattering of the heavier dark fermion from a bound electron in xenon to the lighter dark fermion producing the observed excess events in the recoil electron energy. The model can be tested with further data from Xenon-1T and in future experiments such as SuperCDMS.

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