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Measurement of $CP$ observables in $B^{\pm} \to D^{(*)} K^{\pm}$ and $B^{\pm} \to D^{(*)}\pi^{\pm}$ decays


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2018). Measurement of $CP$ observables in $B^{\pm} \to D^{(*)} K^{\pm}$ and $B^{\pm} \to D^{(*)}\pi^{\pm}$ decays. Physics Letters B, B777:16-30.

Abstract

Measurements of $CP$ observables in $B^{\pm} \to D^{(*)} K^{\pm}$ and $B^{\pm} \to D^{(*)}\pi^{\pm}$ decays are presented, where $D^{(*)}$ indicates a neutral $D$ or $D^*$ meson that is an admixture of $D^{(*)0}$ and $\overline{D}^{(*)0}$ states. Decays of the $D^*$ meson to the $D\pi^0$ and $D\gamma$ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the $B$ candidate invariant mass distribution. Decays of the $D$ meson are fully reconstructed in the $K^{\pm}\pi^{\mp}, K^+K^-$ and $\pi^+\pi^-$ final states. The analysis uses a sample of charged $B$ mesons produced in $pp$ collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb$^{−1}$ taken at centre-of-mass energies of $\sqrt{s}$ = 7, 8 and 13TeV, respectively. The study of $ B^{\pm} \to D^*K^{\pm}$ and $B^{\pm} \to D^*\pi^{\pm}$ decays using a partial reconstruction method is the first of its kind, while the measurement of $B^{\pm} \to DK^{\pm}$ and $B^{\pm} \to D\pi^{\pm}$ decays is an update of previous LHCb measurements. The $B^{\pm} \to DK^{\pm}$ results are the most precise to date.

Abstract

Measurements of $CP$ observables in $B^{\pm} \to D^{(*)} K^{\pm}$ and $B^{\pm} \to D^{(*)}\pi^{\pm}$ decays are presented, where $D^{(*)}$ indicates a neutral $D$ or $D^*$ meson that is an admixture of $D^{(*)0}$ and $\overline{D}^{(*)0}$ states. Decays of the $D^*$ meson to the $D\pi^0$ and $D\gamma$ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the $B$ candidate invariant mass distribution. Decays of the $D$ meson are fully reconstructed in the $K^{\pm}\pi^{\mp}, K^+K^-$ and $\pi^+\pi^-$ final states. The analysis uses a sample of charged $B$ mesons produced in $pp$ collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb$^{−1}$ taken at centre-of-mass energies of $\sqrt{s}$ = 7, 8 and 13TeV, respectively. The study of $ B^{\pm} \to D^*K^{\pm}$ and $B^{\pm} \to D^*\pi^{\pm}$ decays using a partial reconstruction method is the first of its kind, while the measurement of $B^{\pm} \to DK^{\pm}$ and $B^{\pm} \to D\pi^{\pm}$ decays is an update of previous LHCb measurements. The $B^{\pm} \to DK^{\pm}$ results are the most precise to date.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:08 Feb 2018 17:04
Last Modified:20 Feb 2018 09:05
Publisher:Elsevier
ISSN:0370-2693
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2017.11.070

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