scholarly journals Light quark masses in multi-quark interactions

2013 ◽  
Vol 49 (1) ◽  
Author(s):  
A. A. Osipov ◽  
B. Hiller ◽  
A. H. Blin
Keyword(s):  
2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Gavin K. C. Cheung ◽  
◽  
Christopher E. Thomas ◽  
David J. Wilson ◽  
Graham Moir ◽  
...  

Abstract Elastic scattering amplitudes for I = 0 DK and I = 0, 1 $$ D\overline{K} $$ D K ¯ are computed in S, P and D partial waves using lattice QCD with light-quark masses corresponding to mπ = 239 MeV and mπ = 391 MeV. The S-waves contain interesting features including a near-threshold JP = 0+ bound state in I = 0 DK, corresponding to the $$ {D}_{s0}^{\ast } $$ D s 0 ∗ (2317), with an effect that is clearly visible above threshold, and suggestions of a 0+ virtual bound state in I = 0 $$ D\overline{K} $$ D K ¯ . The S-wave I = 1 $$ D\overline{K} $$ D K ¯ amplitude is found to be weakly repulsive. The computed finite-volume spectra also contain a deeply-bound D* vector resonance, but negligibly small P -wave DK interactions are observed in the energy region considered; the P and D-wave $$ D\overline{K} $$ D K ¯ amplitudes are also small. There is some evidence of 1+ and 2+ resonances in I = 0 DK at higher energies.


2000 ◽  
Vol 83-84 ◽  
pp. 173-175
Author(s):  
M. Göckeler ◽  
R. Horsley ◽  
B. Klaus ◽  
W. Kürzinger ◽  
H. Oelrich ◽  
...  
Keyword(s):  

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 591-599 ◽  
Author(s):  
Rajan Gupta ◽  
Kim Maltman

A summary of the extraction of light quark masses from both QCD sumrules and lattice QCD simulations is presented. The focus is on providing a careful statement of the potential weaknesses in each calculation, and on integrating the work of different collaborations to provide a coherent picture.


2002 ◽  
Vol 65 (7) ◽  
Author(s):  
L. Giusti ◽  
C. Hoelbling ◽  
C. Rebbi
Keyword(s):  

2005 ◽  
Vol 140 ◽  
pp. 246-248 ◽  
Author(s):  
D. Bećirević ◽  
P. Boucaud ◽  
V. Giménez ◽  
V. Lubicz ◽  
G. Martinelli ◽  
...  

1985 ◽  
Vol 90 (4) ◽  
pp. 378-387
Author(s):  
P. Loverre ◽  
G. Penso ◽  
C. Verzegnassi
Keyword(s):  

2018 ◽  
Vol 33 (02) ◽  
pp. 1850017
Author(s):  
Noriaki Kitazawa ◽  
Yuki Sakai

We discuss the constraint on the size of QCD instanton effects in low-energy effective theory. Among various instanton effects in meson mass spectrum and dynamics, we concentrate on the instanton-induced masses of light quarks. The famous instanton-induced six-quark interaction, so-called ’t Hooft vertex, could give nonperturbative quantum corrections to light quark masses. Many works have already been achieved to constrain the mass corrections in light meson system, or the system of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], and now we know for a fact that the instanton-induced mass of up-quark is too small to realize the solution of the strong CP problem by vanishing current mass of up-quark. In this work, we give a constraint on the instanton-induced mass correction to light quarks from the mass spectrum of heavy mesons, [Formula: see text], [Formula: see text], [Formula: see text] and their antiparticles. To accomplish this, the complete second-order chiral symmetry breaking terms are identified in heavy meson effective theory. We find that the strength of the constraint from heavy meson masses is at the same level of that from light mesons, and it would be made even stronger by more precise data from future [Formula: see text] factories and lattice calculations.


2010 ◽  
Vol 25 (29) ◽  
pp. 5223-5234 ◽  
Author(s):  
C. A. DOMINGUEZ

The standard procedure to determine (analytically) the values of the quark masses is to relate QCD two-point functions to experimental data in the framework of QCD sum rules. In the case of the light quark sector, the ideal Green function is the pseudoscalar correlator which involves the quark masses as an overall multiplicative factor. For the past thirty years this method has been affected by systematic uncertainties originating in the hadronic resonance sector, thus limiting the accuracy of the results. Recently, a major breakthrough has been made allowing for a considerable reduction of these systematic uncertainties and leading to light quark masses accurate to better than 8%. This procedure will be described in this talk for the up-, down-, strange-quark masses, after a general introduction to the method of QCD sum rules.


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