Observation of the B s 0 → η ′ η ′ Decay

LHCb Collaboration

Research output: Contribution to journalArticle

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Abstract

The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb - 1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31 ± 0.64 (stat) ± 0.28 (syst) ± 0.12 (norm)] × 10 - 5, where the third uncertainty comes from the B ± → η ′ K ± branching fraction that is used as a normalization. In addition, the charge asymmetries of B ± → η ′ K ± and B ± → Φ K ±, which are control channels, are measured to be (- 0.2 ± 1.3) % and (+ 1.7 ± 1.3) %, respectively. All results are consistent with theoretical expectations.

Original languageEnglish (US)
Article number051801
JournalPhysical Review Letters
Volume115
Issue number5
DOIs
StatePublished - Jul 28 2015

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protons
decay
norms
standard deviation
luminosity
asymmetry
collisions
detectors

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Observation of the B s 0 → η ′ η ′ Decay. / LHCb Collaboration.

In: Physical Review Letters, Vol. 115, No. 5, 051801, 28.07.2015.

Research output: Contribution to journalArticle

LHCb Collaboration. / Observation of the B s 0 → η ′ η ′ Decay. In: Physical Review Letters. 2015 ; Vol. 115, No. 5.
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abstract = "The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb - 1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31 ± 0.64 (stat) ± 0.28 (syst) ± 0.12 (norm)] × 10 - 5, where the third uncertainty comes from the B ± → η ′ K ± branching fraction that is used as a normalization. In addition, the charge asymmetries of B ± → η ′ K ± and B ± → Φ K ±, which are control channels, are measured to be (- 0.2 ± 1.3) {\%} and (+ 1.7 ± 1.3) {\%}, respectively. All results are consistent with theoretical expectations.",
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AU - Akar, S.

AU - Albrecht, J.

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AU - Badalov, A.

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N2 - The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb - 1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31 ± 0.64 (stat) ± 0.28 (syst) ± 0.12 (norm)] × 10 - 5, where the third uncertainty comes from the B ± → η ′ K ± branching fraction that is used as a normalization. In addition, the charge asymmetries of B ± → η ′ K ± and B ± → Φ K ±, which are control channels, are measured to be (- 0.2 ± 1.3) % and (+ 1.7 ± 1.3) %, respectively. All results are consistent with theoretical expectations.

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