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Titolo:
A lower bound on sin 2 beta from minimal flavour violation
Autore:
Buras, AJ; Buras, R;
Indirizzi:
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany Tech Univ Munich Garching Germany D-85748 hys, D-85748 Garching, Germany Max Planck Inst Phys, Werner Heisenberg Inst, D-80805 Munich, Germany Max Planck Inst Phys Munich Germany D-80805 nst, D-80805 Munich, Germany
Titolo Testata:
PHYSICS LETTERS B
fascicolo: 3-4, volume: 501, anno: 2001,
pagine: 223 - 230
SICI:
0370-2693(20010308)501:3-4<223:ALBOS2>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEADING QCD CORRECTIONS; UNITARITY TRIANGLE; STANDARD MODEL; CP-VIOLATION; TOP-QUARK; B-DECAYS; LOGARITHMS; K->PI-NU(NU)OVER-BAR; MATRIX; ORDER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Buras, AJ Tech Univ Munich, Dept Phys, D-85748 Garching, Germany Tech UnivMunich Garching Germany D-85748 48 Garching, Germany
Citazione:
A.J. Buras e R. Buras, "A lower bound on sin 2 beta from minimal flavour violation", PHYS LETT B, 501(3-4), 2001, pp. 223-230

Abstract

We point out that there exists an absolute lower bound on sin2 beta in allmodels with minimal flavour violation (MFV), that do not have any new operators beyond those present in the Standard Model and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the KM phase. This bound depends only on \V-cb\, \V-ub/V-cb\ and the hadronic parameters (B) over cap (K), F(Bd)root(B) over cap (d) and xi relevantfor the CP violating parameter epsilon and the B-d,s(0)-(B) over bar (0)(d,s) mixings. Performing a simple scanning over the present ranges of these parameters we find sin2 beta greater than or equal to 0.34. We illustrate how this bound could become stronger when our knowledge of the parameters inquestion improves and when the upper bound on the B-s(0)-(B) over bar (0)(s) mixing ((DeltaM)(s)) will be experimentally known. Provided the future accurate measurements of sin2 beta through the CP asymmetry in B-d(0)((B) over bar (0)(d)) --> psiK(S) will confirm the low values recently reported byBaBar and Belie, there is a likely possibility that this class of models will be excluded. This would firmly imply the necessity of new CP violating phases and/or new effective operators in the weak effective Hamiltonians for K-0-(K) over bar (0) and B-d,s(0)-(K) over bar (0)(d,s) mixings. We also point out that within the MFV models there exists also an absolute lower bound on the angle gamma. We find sin gamma greater than or equal to 0.24. This lower bound could become stronger in the future. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 31/03/20 alle ore 19:41:19