Branching Ratio Measurements of $B_s$ Decays - INSPIRE

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Branching Ratio Measurements of $B_s$ Decays

Kristof De Bruyn
(
- NIKHEF, Amsterdam
)
,
Robert Fleischer
(
- NIKHEF, Amsterdam and
- Vrije U., Amsterdam
)
,
Robert Knegjens
(
- NIKHEF, Amsterdam
)
,
Patrick Koppenburg
(
- NIKHEF, Amsterdam
)
,
Marcel Merk
(
- NIKHEF, Amsterdam and
- Vrije U., Amsterdam
)

Apr, 2012

6 pages

Published in:

Phys.Rev.D 86 (2012) 014027

e-Print:

1204.1735 [hep-ph]

DOI:

10.1103/PhysRevD.86.014027

Report number:

NIKHEF-2012-005

View in:

ADS Abstract Service

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Abstract: (arXiv)

We have just entered an era of precision measurements for

B_s

-decay observables. A characteristic feature of the

B_s

-meson system is

B^0_s

--

\bar B^0_s

mixing, which exhibits a sizable decay width difference. The latter feature leads to a subtle complication for the extraction of branching ratios of

B_s

decays from untagged data samples, leading to systematic biases as large as O(10%) that depend on the dynamics of the considered decay. We point out that this effect can only be corrected for using information from a time-dependent analysis and suggest the use of the effective

B_s

decay lifetime, which can already be extracted from the untagged data sample, for this purpose. We also address several experimental issues that can play a role in the extraction of effective lifetimes at a hadron collider, and advocate the use of the

B_s

branching ratios, as presented in this note, for consistent comparisons of theoretical calculations and experimental measurements in particle listings.

Note:

7 pages, 1 figure, title matches published version in Physical Review D

13.20.He
13.25.Hw
decay: width
width: difference
branching ratio
lifetime
mixing
B/s decays
branching ratios
effective lifetimes

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