Measuring sin 2β in Bs0(t) → φKs

Alakabha Datta, Choong Sun Kim, David London

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10% over most (∼ 80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.

Original languageEnglish
Pages (from-to)153-161
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume507
Issue number1-4
DOIs
Publication statusPublished - 2001 May 17

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quarks
cancellation
asymmetry
decay
sands
operators
probes
matrices

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10{\%} over most (∼ 80{\%}) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.",
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Measuring sin 2β in Bs0(t) → φKs. / Datta, Alakabha; Kim, Choong Sun; London, David.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 507, No. 1-4, 17.05.2001, p. 153-161.

Research output: Contribution to journalArticle

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AU - Datta, Alakabha

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AU - London, David

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N2 - We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10% over most (∼ 80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.

AB - We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10% over most (∼ 80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.

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