Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-07-15
Acta Phys.Polon. 27 (1996) 1719-1738; Nucl.Phys.Proc.Suppl. 52A (1997) 43-54
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, submited as uuencoded gz-compressed .tar file containing LaTeX file and figures. Based on talks given by both author
Scientific paper
10.1016/S0920-5632(96)00531-2
The simplest interpretation of the global success of the Standard Model is that new physics decouples well above the electroweak scale. Supersymmetric extension of the Standard Model offers the possibility of light chargino and the right-handed stop (with masses below $M_Z$), and still maintaining the successful predictions of the Standard Model. The value of $R_b$ can then be enhanced up to $\sim 0.218$ (the Standard Model value is $\sim 0.216$). Light chargino and stop give important contribution to rare processes such as $b\rightarrow s \gamma$, $\overline K^0-K^0$ and $\overline B^0-B^0$ mixing but consistency with experimental results is maintained in a large region of the parameter space. The exotic four-jet events reported by ALEPH (if confirmed) may constitute a signal for supersymmetry with such a light spectrum and with explicitly broken $R-$parity. Their interpretation as pair production of charginos with $m_C\sim 60$ GeV, with subsequent decay $C\rightarrow \tilde t_R b \rightarrow dsb$ (where $m_{\tilde t}\sim 55$ GeV) leads to signatures very close to the experimental observations.
Chankowski Piotr H.
Pokorski Stefan
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