Two-loop heavy top corrections to the b→sγ decay

被引:26
作者
Strumia, A
机构
[1] Univ Pisa, Dipartimento Fis, I-56126 Pisa, Italy
[2] Ist Nazl Fis Nucl, Sez Pisa, I-56126 Pisa, Italy
关键词
D O I
10.1016/S0550-3213(98)00462-3
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We compute the two-loop corrections to the coefficient of the b --> s gamma magnetic penguin present in the limits of heavy top and/or heavy Higgs. These kinds of corrections affect in a significant way the observables measured at LEP. On the contrary we find that, due to a numerical accident, the correction to BR(B --> X(s)gamma) is negligible (below the 1% level far any possible value of the Higgs mass) when the leading order result is expressed in the usual way in terms of the semileptonic BR(B --> X-c<(e)over bar nu>). (C) 1998 Elsevier Science B.V.
引用
收藏
页码:28 / 42
页数:15
相关论文
共 47 条
[1]  
ABEL SA, HEPPH9803401
[2]   O(ALPHA(S)) CALCULATION OF THE DECAYS B-]S+GAMMA AND B-]S+G [J].
ADEL, K ;
YAO, YP .
PHYSICAL REVIEW D, 1994, 49 (09) :4945-4948
[3]   TOWARDS A MODEL-INDEPENDENT ANALYSIS OF RARE B-DECAYS [J].
ALI, A ;
GIUDICE, GF ;
MANNEL, T .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1995, 67 (03) :417-432
[4]   PHOTON ENERGY-SPECTRUM IN B-]X(S)+GAMMA AND COMPARISON WITH DATA [J].
ALI, A ;
GREUB, C .
PHYSICS LETTERS B, 1995, 361 (1-4) :146-154
[5]   Electroweak precision tests: A concise review [J].
Altarelli, G ;
Barbieri, R ;
Caravaglios, F .
INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 1998, 13 (07) :1031-1058
[6]   Naturalness lowers the upper bound on the lightest Higgs boson mass in supersymmetry [J].
Anderson, GW ;
Castano, DJ ;
Riotto, A .
PHYSICAL REVIEW D, 1997, 55 (05) :2950-2954
[7]   HADRONIC FLAVOR AND CP-VIOLATING SIGNALS OF SUPERUNIFICATION [J].
BARBIERI, R ;
HALL, L ;
STRUMIA, A .
NUCLEAR PHYSICS B, 1995, 449 (03) :437-461
[8]   CP violation in B decays and supersymmetry [J].
Barbieri, R ;
Strumia, A .
NUCLEAR PHYSICS B, 1997, 508 (1-2) :3-16
[9]   SIGNALS FOR SUPERSYMMETRIC UNIFICATION [J].
BARBIERI, R ;
HALL, LJ .
PHYSICS LETTERS B, 1994, 338 (2-3) :212-218
[10]   2-LOOP HEAVY-TOP EFFECTS IN THE STANDARD MODEL [J].
BARBIERI, R ;
BECCARIA, M ;
CIAFALONI, P ;
CURCI, G ;
VICERE, A .
NUCLEAR PHYSICS B, 1993, 409 (01) :105-127