Ερευνητικό υλικό ΕΚΠΑ

Determination of vertical bar V-cb vertical bar from the semileptonic
decay B-0->D*(-)l(+)nu

Αγγλικά

Semileptonic decays B –> D*(-)l(+)nu X were selected from a sample of
3.1 million hadronic Z decays collected by the DELPHI detector at LEP. A
topological search for semileptonic B decays to resonant and
non-resonant D*(-)pi(+) states was performed and the ratio of the
branching fractions:
Br(B –> D*(-)l(+)nu X)/Br(B –> D*(-)l(+)nu X) + Br(B-0 –>
D*(-)l(+)nu)
= 0.19 +/- 0.10(stat) +/- 0.06(syst)
was determined. Taking into account this contribution, the differential
decay width of B-0 –> D*(-)l(+)nu was measured as a function of the
momentum transfer from the B to the D*(-) in two separate analyses,
using exclusive and inclusive methods of D*(-) reconstruction. The
distributions were fitted over the full momentum transfer range to
extract the product of /V-cb/ times the normalization of the decay form
factor F(q(max)(2)):
F(q(max)(2))/V-cb/ = (35.4 +/- 1.9(stat) +/- 2.4(syst)) . 10(-3).
The value of /V-cb/ was computed using theoretical calculations of
F(q(max?2), giving:
/V-cb/ = (38.9 +/- 2.0(stat) +/- 2.6(syst) +/- 1.7(theory)) . 10(-3).
The total branching fraction Br(B-0 –> D*(-)l(-)nu) was determined to
be:
Br(B-0 –> D*(-)l(+)nu) = (5.52 +/- 0.17(stat) +/- 0.68(syst))%.

1996

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ZEITSCHRIFT FUR PHYSIK. SECTION C, PARTICLES AND FIELDS

Springer-Verlag

71

4

539-553

https://doi.org/10.1007/s002880050202

10.1007/s002880050202

https://pergamos.lib.uoa.gr/uoa/dl/object/3048472