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The t → cH decay width has been computed in the standard model with a light Higgs boson. The corresponding branching fraction has been found to be in the range B(t → cH) ≃ 10 −13 ÷ 10 −14 for M Z ∼ < m H ∼ < 2M W . Our results correct the numerical evaluation usually quoted in the literature.

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A bstractW e report a study on the m easurem ent of the SU SY breaki ng scal e p F i n the fram ework of gauge-m edi ated supersym m etry breaki ng (G M SB ) m odel s at the LH C .T he work i s focused on the G M SB scenari o w here a stau i s the next-to-l i ghtest SU SY parti cl e (N LSP) and decays i nto a gravi ti no w i th l i feti m e c N LSP i n the range 0. 5 m to 1 km . W e study the i denti cati on ofl ongl i ved sl eptons usi ng the m om entum and ti m e of i ght m easurem ents i n the m uon cham bers of the AT LA S experi m ent. A real i sti c eval uati on ofthe stati sti caland system ati c uncertai nti es on the m easurem entofthe sl epton m assand l i feti m e i sperform ed,based on a detai l ed si m ul ati on of the detectorresponse.A ccessi bl e range and preci si on on p F achi evabl e w i th a counti ng m ethod are assessed. M any features ofouranal ysi s can be extended to the study ofdi erenttheoreti cal fram eworks w i th si m i l ar si gnatures at the LH C .

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We argue that there is strong experimental evidence in the data of b-and c-decays that the pattern of power suppressed corrections predicted by the short distance expansion, the heavy quark effective theory and the assumption of local duality is not correct for the non-leptonic inclusive widths. The data indicate instead the presence of 1/m corrections that should be absent in the above theoretical framework. These corrections can be simply described by replacing the heavy quark mass by the mass of the decaying hadron in the m 5 factor in front of all the non-leptonic widths.