scholarly journals Pion mass splitting and phase structure in twisted mass QCD

2004 ◽  
Vol 37 (4) ◽  
pp. 445-455 ◽  
Author(s):  
L. Scorzato
Keyword(s):  
Phase Structure ◽  
Pion Mass ◽  
Mass Splitting ◽  
Twisted Mass

scholarly journals Nucleon axial form factors using Nf=2 twisted mass fermions with a physical value of the pion mass

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
C. Alexandrou ◽  
M. Constantinou ◽  
K. Hadjiyiannakou ◽  
K. Jansen ◽  
C. Kallidonis ◽  
...  
Keyword(s):  
Pion Mass ◽  
Form Factors ◽  
Twisted Mass ◽  
Axial Form

scholarly journals Rotated twisted-mass: a convenient regularization scheme for isospin breaking QCD and QED lattice calculations

2021 ◽  
Vol 57 (9) ◽  
Author(s):  
R. Frezzotti ◽  
G. Gagliardi ◽  
V. Lubicz ◽  
F. Sanfilippo ◽  
S. Simula
Keyword(s):  
Correlation Functions ◽  
Mass Splitting ◽  
Isospin Breaking ◽  
Numerical Application ◽  
Practical Advantage ◽  
Regularization Scheme ◽  
Statistical Fluctuations ◽  
Twisted Mass ◽  
Lattice Calculations

AbstractWe propose a scheme of lattice twisted-mass fermion regularization which is particularly convenient for application to isospin breaking (IB) QCD and QED calculations, based in particular on the so called RM123 approach, in which the IB terms of the action are treated as a perturbation. The main, practical advantage of this scheme is that it allows the calculation of IB effects on some mesonic observables, like e.g. the $$\pi ^+ - \pi ^0$$ π + - π 0 mass splitting, using lattice correlation functions in which the quark and antiquark fields in the meson are regularized with opposite values of the Wilson parameter r. These correlation functions are found to be affected by much smaller statistical fluctuations, with respect to the analogous functions in which quark and antiquark fields are regularized with the same value of r. Two numerical application of this scheme, that we call rotated twisted-mass, within pure QCD and QCD + QED respectively, are also provided for illustration.

scholarly journals D → π and D → K semileptonic form factors with Nf = 2 + 1 + 1 twisted mass fermions

2018 ◽  
Vol 175 ◽  
pp. 13026
Author(s):  
Vittorio Lubicz ◽  
Lorenzo Riggio ◽  
Giorgio Salerno ◽  
Silvano Simula ◽  
Cecilia Tarantino
Keyword(s):  
Pion Mass ◽  
Form Factors ◽  
Kinematical Region ◽  
Matrix Elements ◽  
Scalar Form ◽  
Mass Collaboration ◽  
Twisted Mass ◽  
The Matrix ◽  
Additional Form

We present a lattice determination of the vector and scalar form factors of the D → π(K)lv semileptonic decays, which are relevant for the extraction of the CKM matrix elements |Vcd| and |Vcs| from experimental data. Our analysis is based on the gauge configurations produced by the European Twisted Mass Collaboration with Nf = 2 + 1 +1 flavors of dynamical quarks. We simulated at three different values of the lattice spacing and with pion masses as small as 210 MeV. The matrix elements of both vector and scalar currents are determined for a plenty of kinematical conditions in which parent and child mesons are either moving or at rest. Lorentz symmetry breaking due to hypercubic effects is clearly observed in the data and included in the decomposition of the current matrix elements in terms of additional form factors. After the extrapolations to the physical pion mass and to the continuum limit the vector and scalar form factors are determined in the whole kinematical region from q2 = 0 up to [see formula in PDF] accessible in the experiments, obtaining a good overall agreement with experiments, except in the region at high values of q2 where some deviations are visible.

scholarly journals Phase structure with nonzeroΘQCDand twisted mass fermions

2015 ◽  
Vol 92 (9) ◽  
Author(s):  
Derek P. Horkel ◽  
Stephen R. Sharpe
Keyword(s):  
Phase Structure ◽  
Twisted Mass

scholarly journals Twisted mass quarks and the phase structure of lattice QCD

2005 ◽  
Vol 39 (4) ◽  
Author(s):  
F. Farchioni ◽  
R. Frezzotti ◽  
K. Jansen ◽  
I. Montvay ◽  
G. C. Rossi ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Phase Structure ◽  
Twisted Mass

scholarly journals Exploring the phase structure of lattice QCD with twisted mass quarks

2005 ◽  
Vol 140 ◽  
pp. 240-245 ◽  
Author(s):  
F. Farchioni ◽  
C. Urbach ◽  
R. Frezzotti ◽  
K. Jansen ◽  
I. Montvay ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Phase Structure ◽  
Twisted Mass

scholarly journals Connected and disconnected contributions to nucleon axial form factors using Nf = 2 twisted mass fermions at the physical point

2018 ◽  
Vol 175 ◽  
pp. 06003 ◽  
Author(s):  
Constantia Alexandrou ◽  
Martha Constantinou ◽  
Kyriakos Hadjiyiannakou ◽  
Karl Jansen ◽  
Christos Kallidonis ◽  
...  
Keyword(s):  
Ground State ◽  
Pion Mass ◽  
Charm Quark ◽  
Form Factors ◽  
Physical Point ◽  
Twisted Mass ◽  
Axial Form ◽  
Wilson Fermions ◽  
Quark Loops

We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions, using an ensemble of Nf = 2 twisted mass cloverimproved Wilson fermions simulated with approximately the physical value of the pion mass. The light disconnected quark loops are computed using exact deflation, while the strange and the charm quark loops are evaluated using the truncated solver method. Techniques such as the summation and the two-state fits have been employed to access ground-state dominance.

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