scholarly journals Strange quark momentum fraction from overlap fermion

2015 ◽  
Author(s):  
Mingyang Sun ◽  
Yi-bo Yang ◽  
Keh-Fei Liu ◽  
Ming Gong
Keyword(s):  
Strange Quark ◽  
Momentum Fraction ◽  
Quark Momentum

scholarly journals A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction

2014 ◽  
Author(s):  
Thomas Rae ◽  
Benjamin Jaeger ◽  
Stefano Capitani ◽  
Michele Della Morte ◽  
Dalibor Djukanovic ◽  
...  
Keyword(s):  
Form Factors ◽  
Momentum Fraction ◽  
Axial Charge ◽  
Quark Momentum

scholarly journals Nucleon charges and quark momentum fraction with $N_f=2+1$ Wilson fermions

2019 ◽  
Author(s):  
Konstantin Ottnad ◽  
Tim Harris ◽  
Harvey Meyer ◽  
Georg von Hippel ◽  
Jonas Wilhelm ◽  
...  
Keyword(s):  
Momentum Fraction ◽  
Quark Momentum ◽  
Wilson Fermions

scholarly journals Nucleon average quark momentum fraction with Nf = 2+1 Wilson fermions

2018 ◽  
Vol 175 ◽  
pp. 06026 ◽  
Author(s):  
Konstantin Ottnad ◽  
Tim Harris ◽  
Harvey Meyer ◽  
Georg von Hippel ◽  
Jonas Wilhelm ◽  
...  
Keyword(s):  
Excited State ◽  
Lattice Spacing ◽  
Axial Vector ◽  
Momentum Fraction ◽  
Preliminary Results ◽  
Source Sink ◽  
Quark Momentum ◽  
Wilson Fermions

We report on an analysis of the average quark momentum fraction of the nucleon and related quantities using Nf = 2 + 1 Wilson fermions. Computations are performed on four CLS ensembles covering three values of the lattice spacing at pion masses down to Mπ ≈ 200 MeV. Several source-sink separations (~ 1:0 fm to ~ 1:4 fm) are used to assess the excited-state contamination. To gain further insight, the generalized pencil-of-functions approach has been implemented to reduce the excited-state contamination in the relevant two-and three-point functions. Preliminary results are shown for the isovector nucleon charges from vector, axial vector and tensor derivative (twist-2) operators.

Strange Quark Matter as Dark Matter

2019 ◽  
Vol 22 (4) ◽  
pp. 311-317
Author(s):  
Hidezumi Terazawa
Keyword(s):  
Dark Matter ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Quark Stars

New forms of matter such as super-hypernuclei (strange quark matter) and superhypernuclear stars (strange quark stars) as candidates for dark matter are discussed in some detail, based on the so-called "Bodmer–Terazawa–Witten hypothesis" assuming that they are stable absolutely or quasi-stable (decaying only weakly).

scholarly journals Standard Model prediction of the Bc lifetime

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Jason Aebischer ◽  
Benjamín Grinstein
Keyword(s):  
Standard Model ◽  
Model Prediction ◽  
Strange Quark ◽  
Standard Model Prediction ◽  
New Physics ◽  
Operator Product ◽  
Special Focus ◽  
Third Order ◽  
Clear Cut ◽  
The Standard Model

Abstract Applying an operator product expansion approach we update the Standard Model prediction of the Bc lifetime from over 20 years ago. The non-perturbative velocity expansion is carried out up to third order in the relative velocity of the heavy quarks. The scheme dependence is studied using three different mass schemes for the $$ \overline{b} $$ b ¯ and c quarks, resulting in three different values consistent with each other and with experiment. Special focus has been laid on renormalon cancellation in the computation. Uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties are discussed in detail. The resulting uncertainties are still rather large compared to the experimental ones, and therefore do not allow for clear-cut conclusions concerning New Physics effects in the Bc decay.

scholarly journals Was GW190814 a Black Hole–Strange Quark Star System?

2021 ◽  
Vol 126 (16) ◽  
Author(s):  
I. Bombaci ◽  
A. Drago ◽  
D. Logoteta ◽  
G. Pagliara ◽  
I. Vidaña
Keyword(s):  
Black Hole ◽  
Strange Quark ◽  
Quark Star ◽  
Star System

scholarly journals Strange quark star in dilaton gravity

2019 ◽  
Vol 19 (6) ◽  
pp. 078
Author(s):  
Alireza Peivand ◽  
Kazem Naficy ◽  
Gholam Hossein Bordbar
Keyword(s):  
Strange Quark ◽  
Quark Star ◽  
Dilaton Gravity

scholarly journals Bs → Kℓv form factors with 2+1 flavors

2018 ◽  
Vol 175 ◽  
pp. 13008 ◽  
Author(s):  
Yuzhi Liu ◽  
Jon A. Bailey ◽  
A. Bazavov ◽  
C. Bernard ◽  
C. M. Bouchard ◽  
...  
Keyword(s):  
Quark Mass ◽  
Strange Quark ◽  
Lattice Spacing ◽  
Light Quark ◽  
Form Factors ◽  
Ckm Matrix ◽  
Strange Quark Mass ◽  
Light Quark Mass ◽  
B Quark

Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → Kℓv decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coarsest and finest lattice spacings, the light quark mass m’l is one-tenth the strange quark mass m’s. At the intermediate lattice spacing, the ratio m’l/m’s ranges from 0.05 to 0.2. The valence b quark is treated using the Sheikholeslami-Wohlert Wilson-clover action with the Fermilab interpretation. The other valence quarks use the asqtad action. When combined with (future) measurements from the LHCb and Belle II experiments, these calculations will provide an alternate determination of the CKM matrix element |Vub|.

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