Higgs mediated flavor violating top quark decays t{yields}u{sub i}H, u{sub i{gamma}}, u{sub i{gamma}{gamma}}, and the process {gamma}{gamma}{yields}tc in effective theories

Journal Article · Thu Apr 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.077701· OSTI ID:21409539

Aranda, J I; Ramirez-Zavaleta, F; Tututi, E S ^[1]; Cordero-Cid, A ^[2]; Toscano, J J ^[3]

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1. Facultad de Ciencias Fisico Matematicas, Universidad Michoacana de San Nicolas de Hidalgo, Avenida Francisco J. Mujica S/N, 58060, Morelia, Michoacan (Mexico)
2. Facultad de Ciencias de la Electronica, Benemerita Universidad Autonoma de Puebla, Blvd. 18 Sur y Av. San Claudio, 72590, Puebla, Pue. (Mexico)
3. Facultad de Ciencias Fisico Matematicas, Benemerita Universidad Autonoma de Puebla, Apartado Postal 1152, Puebla, Puebla (Mexico)

The rare top quark couplings tu{sub i{gamma}} and tu{sub i{gamma}{gamma}} (u{sub i}=u, c) induced at the one-loop level by a flavor violating tu{sub i}H vertex are studied within the context of an effective Yukawa sector that incorporates SU{sub L}(2)xU{sub Y}(1)-invariant operators of up to dimension six. Data on the recently observed D{sup 0}-D{sup 0} mixing are employed to constrain the tu{sub i}H vertex, which is then used to predict the t{yields}u{sub i}H, t{yields}u{sub i{gamma}}, and t{yields}u{sub i{gamma}{gamma}} decays, as well as the {gamma}{gamma}{yields}tu{sub i}+tu{sub i} reaction in the context of the ILC. It is found that the t{yields}cH and t{yields}c{gamma}{gamma} decays can reach sizable branching ratios as high as 5x10{sup -3} and 10{sup -4}, respectively. As for the t{yields}c{gamma} decay, it can have a branching ratio of 5x10{sup -8} that is about 6 orders of magnitude larger than the standard model prediction, which, however, is still very small to be detected. As for tc production, it is found that, due to the presence of a resonant effect in the convoluted cross section {sigma}(e{sup +}e{sup -{yields}{gamma}{gamma}{yields}}tc+tc), about (0.5-2.7)x10{sup 3} tc events may be produced at the ILC for a value of the Higgs mass near to the top mass.

• OSTI ID: 21409539
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 7; Other Information: DOI: 10.1103/PhysRevD.81.077701; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
COUPLING
CROSS SECTIONS
D NEUTRAL MESONS
ELECTRON-POSITRON INTERACTIONS
FLAVOR MODEL
FORECASTING
HIGGS BOSONS
HIGGS MODEL
MASS
MIXING
PARTICLE DECAY
RADIATIVE DECAY
STANDARD MODEL
SU-2 GROUPS
T QUARKS
U-1 GROUPS
YUKAWA POTENTIAL
BOSONS
CHARM PARTICLES
CHARMED MESONS
COMPOSITE MODELS
D MESONS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIE GROUPS
MATHEMATICAL MODELS
MESONS
NUCLEAR POTENTIAL
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
POTENTIALS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
SU GROUPS
SYMMETRY GROUPS
TOP PARTICLES
U GROUPS
UNIFIED GAUGE MODELS