Ratio of kaon and pion leptonic decay constants with Nf=2+1+1 Wilson-clover twisted-mass fermions

被引：7

作者：

Alexandrou, C. ^{[1
,2
]}

Bacchio, S. ^{[2
]}

Bergner, G. ^{[3
]}

Dimopoulos, P. ^{[4
,5
]}

Finkenrath, J. ^{[2
]}

Frezzotti, R. ^{[6
,7
]}

Garofalo, M. ^{[8
,9
,10
]}

Kostrzewa, B. ^{[11
]}

Koutsou, G. ^{[2
]}

Labus, P. ^{[12
]}

Sanfilippo, F. ^{[9
]}

Simula, S. ^{[9
]}

Ueding, M. ^{[10
]}

Urbach, C. ^{[10
]}

Wenger, U. ^{[13
]}

机构：

[1] Univ Cyprus, Dept Phys, CY-20537 Nicosia, Cyprus

[2] Cyprus Inst, Computat Based Sci & Technol Res Ctr, 20 Konstantinou Kavafi St, CY-2121 Nicosia, Cyprus

[3] Univ Jena, Inst Theoret Phys, Max Wien Pl 1, D-07743 Jena, Germany

[4] Univ Parma, Dipartimento Sci Matemat Fis & Informat, Parco Area Sci 7-A Campus, I-43124 Parma, Italy

[5] Ist Nazl Fis Nucl, Grp Collegato Parma, Parco Area Sci 7-A Campus, I-43124 Parma, Italy

[6] Univ Rotna Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[7] Ist Nazl Fis Nucl, Sez Tor Vergata, Via Ric Sci 1, I-00133 Rome, Italy

[8] Univ Roma Tre, Dipartimento Fis, Via Vasca Navale 84, I-00146 Rome, Italy

[9] Ist Nazl Fis Nucl, Sez Roma Tre, Via Vasca Navale 84, I-00146 Rome, Italy

[10] Rheinische Friedrich Wilhelms Univ Bonn, HISKP Theory, Nussallee 14-16, D-53115 Bonn, Germany

[11] Rheinische Friedrich Wilhelms Univ Bonn, High Performance Comp & Analyt Lab, Friedrich Hirzebruch Allee 8, D-53115 Bonn, Germany

[12] Fraunhofer Inst Ind Math ITWM, Fraunhofer Pl 1, D-67663 Kaiserslautern, Germany

[13] Univ Bern, Albert Einstein Ctr Fundamental Phys, Inst Theoret Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 07期

基金：

欧盟地平线“2020”;

关键词：

LATTICE ACTION; IMPROVEMENT; SYMMETRY; QCD;

D O I：

10.1103/PhysRevD.104.074520

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a determination of the ratio of kaon and pion leptonic decay constants in isosymmetric QCD (ISOQCD), f(K)/f(p), making use of the gauge ensembles produced by the Extended Twisted Mass Collaboration with N-f = 2 + 1 + 1 flavors of Wilson-clover twisted-mass quarks, including configurations close to the physical point for all dynamical flavors. The simulations are carried out at three values of the lattice spacing ranging from similar to 0.068 to similar to 0.092 fm with linear lattice size up to L similar to 5.5 fm. The scale is set by the particle data group (PDG) value of the pion decay constant, f(pi)(ISOQCD) = 130.4(2) MeV, at the ISOQCD pion point, M-pi(ISOQCD) = 135.0(2) MeV, obtaining for the gradient-flow scales the values w(0) = 0.17383(63)(fm), root t(0) = 0.14436(61) fm and t(0)/w(0) = 0.11969(62) fm. The data are analyzed within the framework of SU(2) chiral perturbation theory without resorting to the use of renormalized quark masses. At the ISOQCD kaon point M-K(ISOQCD) = 494.2(4) MeV we get (f(K)/f(pi))(ISOQCD) = 1.1995(44), where the error includes both statistical and systematic uncertainties. Implications for the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-us vertical bar and for the first-row Cabibbo-Kobayashi-Maskawa unitarity are discussed.

引用

页数：32

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