B{sub K}-parameter from N{sub f}=2 twisted mass lattice QCD

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.014505· OSTI ID:21503887

Constantinou, M; Panagopoulos, H; Skouroupathis, A; Stylianou, F ^[1]; Dimopoulos, P ^[2]; Frezzotti, R; Rossi, G C ^[3]; Jansen, K ^[4]; Gimenez, V ^[5]; Lubicz, V ^[6]; Mescia, F ^[7]; Papinutto, M ^[8]; Simula, S ^[9]; Vladikas, A ^[10]

---

1. Department of Physics, University of Cyprus, P.O. Box 20537, Nicosia CY-1678 (Cyprus)
2. Dipartimento di Fisica, Sapienza, Universita di Roma, Piazzale A. Moro, I-00185 Rome (Italy)
3. Dipartimento di Fisica, Universita di Roma, 'Tor Vergata' Via della Ricerca Scientifica 1, I-00133 Rome (Italy)
4. DESY, Zeuthen Platanenallee 6, D-15738 Zeuthen (Germany)
5. Departament de Fisica Teorica and IFIC, Univ. de Valencia-CSIC, Dr. Moliner 50, E-46100 Valencia (Spain)
6. Dipartimento di Fisica, Universita di Roma, Tre Via della Vasca Navale 84, I-00146 Rome (Italy)
7. Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, 6a pianta, Diagonal 647 E-08028 Barcelona (Spain)
8. Laboratoire de Physique Subatomique et de Cosmologie, UJF/CNRS-IN2P3/INPG, 53 rue des Martyrs, 38026 Grenoble (France)
9. INFN, Sezione di Roma Tre c/o Dipartimento di Fisica, Universita di Roma, Tre Via della Vasca Navale 84, I-00146 Rome (Italy)
10. INFN, Sezione di 'Tor Vergata' c/o Dipartimento di Fisica, Universita di Roma 'Tor Vergata' Via della Ricerca Scientifica 1, I-00133 Rome (Italy)

We present an unquenched N{sub f}=2 lattice computation of the B{sub K} parameter which controls K{sup 0}-K{sup 0} oscillations. A partially quenched setup is employed with two maximally twisted dynamical (sea) light Wilson quarks, and valence quarks of both the maximally twisted and the Osterwalder-Seiler variety. Suitable combinations of these two kinds of valence quarks lead to a lattice definition of the B{sub K} parameter which is both multiplicatively renormalizable and O(a) improved. Employing the nonperturbative RI-MOM scheme, in the continuum limit and at the physical value of the pion mass we get B{sub K}{sup RGI}=0.729{+-}0.030, a number well in line with the existing quenched and unquenched determinations.

• OSTI ID: 21503887
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 1; Other Information: DOI: 10.1103/PhysRevD.83.014505; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CALCULATION METHODS
D QUARKS
KAON-KAON INTERACTIONS
KAONS NEUTRAL
LATTICE FIELD THEORY
MASS
OSCILLATIONS
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
U QUARKS
VALENCE
BOSONS
CONSTRUCTIVE FIELD THEORY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
KAONS
MESON-MESON INTERACTIONS
MESONS
PARTICLE INTERACTIONS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
STRANGE MESONS
STRANGE PARTICLES