Determination of the average lifetime of bottom hadrons

doi:10.1016/0370-2693(84)90380-0

Physics Letters B

Volume 149, Issue 6, 27 December 1984, Pages 524-532

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Abstract

We have determined the average lifetime of hadrons containing b quarks produced in e⁺e⁻ annihilation to be $τ B = 1.83 +0.83 +0.37 − −0.34 ×10^{−12} s$ . Our method uses charged decay products from both non-leptonic and semileptonic decay modes.

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The flavour changing neutral current decay b→sγ has been detected in hadronic Z decays collected by ALEPH at LEP. The signal is isolated in lifetime-tagged $b b ̄$ events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The background processes are normalised from the data themselves. The inclusive branching ratio is measured to beconsistent with the Standard Model expectation via penguin processes.
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The physics of heavy flavours has played a dominant role in high energy physics research ever since the discovery of charm in 1974, followed by the τ lepton in 1975 and bottom in 1977. With the startup of the large experiments at the e⁺e- colliders LEP and the SLC a new type of detector system has now come into operation which has a major impact on the studies of heavy flavours: the silicon strip vertex detector.
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^☆: The analysis presented here has consumed a large amount of computer time. We are grateful to the DESY Rechenzentrum and in particular to P. Kuhlmann, and to the Computing Centre of the Rutherfod Appleton Laboratory for their support. A part of the computation was performed on the 370 emulator designed and built by H. Brafman, whose contribution we gratefully acknowledge. We are indebted to the PETRA machine group for its dedicated work. Those of us from outside DESY wish to thank the DESY directorate for their hospitality.

¹: Supported by the Deutsches Bundesministerium für Forschung und Technologie.

²: Supported by the UK Science and Engineering Research Council.

³: On leave from Institute of Nuclear Physics, Cracow, Poland.

⁴: On leave from Warsaw University, Poland.

⁵: On leave from Weizmann Institute, Rehovot, Israel.

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Physics Letters B

Abstract

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Cited by (32)

A measurement of the inclusive b → sγ branching ratio

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Measurement of the lifetime of B-hadrons and a determination of |V<inf>cb</inf>|

Measurements in delphi of the hadronic branching fractions of the Z<sup>0</sup> into c and b quark pairs

Quark mixing and CP violation

The structure of jets in e<sup>+</sup>e<sup>-</sup> collisions

Determination of the average lifetime of bottom hadrons☆

Abstract

Phys. Lett.

Phys. Lett.

IC 84/HENP/2 and DESY 84-060

Phys. Rev.

DESY 84-061

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

UNIDO 84/282

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Lett.

Z. Phys.

Nucl. Instrum. Methods

Phys. Lett.

Z. Phys.

Phys. Lett.