منابع مشابه
Determination of V ub at the Z – boson resonance
We show that the observation of energetic charged leptons from semileptonic b becays at the LEP and SLC Z–boson factories offers a unique opportunity to measure the quark mixing matrix element V ub. We present various distributions of the b decay products to show that the b → u decays can be cleanly separated from the b → c decays, with a signal of O(100) events per million Z bosons produced.
متن کاملThe Z Boson Resonance Parameters
The Z line shape is measured at LEP/CERN with an accuracy at the per mille level. Usually it is described in the Standard Model of electroweak interactions with account of quantum corrections. Alternatively, one may attempt an S-matrix based modelindependent approach in order to extract quantities like mass and width of the Z boson. I describe the formalism and its application to data.
متن کاملStudy of the Z Boson at LEP
The Z line shape is measured at LEP with an accuracy at the per mille level. Usually it is described in the Standard Model of electroweak interactions with account of quantum corrections. Alternatively, one may attempt different model-independent approaches in order to extract quantities like mass and width of the Z boson. If a fit deviates from that in the standard approach, this may give hint...
متن کاملThe aT distribution of the Z boson at hadron colliders
We provide the first theoretical study of a novel variable, aT , proposed in Ref. [1] as a more accurate probe of the region of low transverse momentum pT , for the Z boson pT distribution at hadron colliders. The aT is the component of pT transverse to a suitably defined axis. Our study involves resummation of large logarithms in aT up to the next-to–leading logarithmic accuracy and we compare...
متن کاملPrecision determination of Vub
We review how to determine |Vub| from inclusive semileptonic B decay using combined cuts on the leptonic and hadronic invariant masses to eliminate the b → c background. This leads to a determination of |Vub| with theoretical uncertainty at the 5–10% level. LBNL-49079, UCSD/PTH 01-22, UTPT-01-13 The magnitude of Vub determines the length of one of the side of the unitarity triangle and is there...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(94)01594-3