Measurements of semileptonic branching fractions of B mesons at the ϒ(4S) resonance

We have measured, with electron tagging, the forward-backward asymmetries of charm-and bottom-quark pair productions at √ s =58.01GeV, based on 23,783 hadronic events selected from a data sample of 197pb −1 taken with the TOPAZ detector at TRISTAN. The measured forward-backward asymmetries are A c F B = −0.49±0.20(stat.)±0.08(sys.) and A b F B = −0.64±0.35(stat.)±0.13(sys.), which are consistent with the standard model predictions.

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“…± 1.6(sys. )%, which are in good agreement with the previously measured values of 9.6 ± 0.9% [16] and 10.8 ± 0.5% [16,17], respectively.…”

Section: Resultssupporting

confidence: 93%

Measurement of the forward-backward asymmetries for charm- and bottom-quark pair productions at with electron tagging

Nakano¹,

Enomoto²,

Iwasaki³

et al. 1994

Physics Letters B

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“…Two other states, a 0 + and another 1 + are predicted but have not yet been observed, presumably because of their large intrinsic widths. There is evidence for D * * production in semileptonic B decays [101], and D * * mesons have also been seen in hadronic decays. However, early experiments did not have sufficient data to separate the two narrow D * * states and hence reported branching ratios only for the combination of the two (see results listed under B → D ( * )0 J in Tables IX and X).…”

Section: A Measurements Of D(nπ) − Final Statesmentioning

confidence: 99%

Nonleptonic Decays and Lifetimes of Charm and Beauty Particles

Browder

Honscheid

Pedrini

1996

Annu. Rev. Nucl. Part. Sci.

110

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“…In the naïve spectator model for hadronic decays, the relationship between semileptonic and hadronic widths, and thus the semileptonic branching fraction, is readily predicted [1]. Unfortunately, this simple picture does not seem to hold; for the past decade, the measured average branching fraction,b, of B's in Υ(4S) events [2,3,4] has been ∼15% lower than predictions [1].…”

mentioning

confidence: 99%