Lepton pair emission in the top quark decayt→bW+ℓ−ℓ+

Autor:	Gabriel López Castro, Nestor Quintero, J. Lorenzo Diaz-Cruz
Rok vydání:	2014
Předmět:	Physics Nuclear and High Energy Physics Particle physics Top quark Branching fraction High Energy Physics::Phenomenology Lepton number Standard Model Massless particle Nuclear physics Low energy High Energy Physics::Experiment Invariant mass Lepton
Zdroj:	Physical Review D. 89
ISSN:	1550-2368 1550-7998
DOI:	10.1103/physrevd.89.093014
Popis:	The heaviness of the top quark makes its two-body Cabibbo-favored decay mode t → b W + to be dominant, at such a level that hardly any other decay mode reaches a detectable branching ratio within the Standard Model. Here we study the decay t → b W + l - l + ( l = e , μ , τ ), which diverges for massless leptons, and it can reach a branching ratio ∼ O ( 1 0 - 5 ∼ 1 0 - 6 ) for reasonable values of the low energy cut in the lepton pair invariant mass. This rate surpasses almost any other rare decays such as t → c X ( X = γ , Z , g , H , W + W - ), and thus offers the possibility of being detectable. Furthermore, the estimate of this channel is relevant because it can mimic the signal arising from the lepton number violating decay t → b W - l + l + , when the W boson decays into lepton channels.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a05180d308b9ff33f69d36b0dc0227ee https://doi.org/10.1103/physrevd.89.093014 Zobrazit plný text záznamu