Observation of the decays B0(s) → Ds1(2536)∓K±

LHCb Collaboration; Daniel Johnson; Cristina Lazzeroni; Marcus Madurai; Niladribihari Sahoo; Mark Slater; Paul Swallow; Daniel Thompson; Nigel Watson

doi:10.1007/JHEP10(2023)106

Observation of the decays B⁰_(s) → D_s1(2536)^∓K^±

LHCb Collaboration, Daniel Johnson, Cristina Lazzeroni, Marcus Madurai, Niladribihari Sahoo, Mark Slater, Paul Swallow, Daniel Thompson, Nigel Watson

Physics and Astronomy

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Abstract

This paper reports the observation of the decays B⁰_(s)→ D_s1(2536)^∓K^± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb⁻¹. The branching fractions of these decays are measured relative to the normalisation channel B⁰ → D̅⁰K⁺K⁻. The D_s1(2536)⁻ meson is reconstructed in the D̅*(2007)⁰K⁻ decay channel and the products of branching fractions are measured to be

B (B⁰_s → D_s1(2536)^∓K^±) × B (D_s1(2536)⁻→ D̅^∗(2007)⁰K⁻)
= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10⁻⁵,
B (B⁰→ D_s1(2536)^∓K^±) × B (D_s1(2536)⁻→ D̅^∗(2007)⁰K⁻)
= (0.510 ± 0.021 ± 0.036 ± 0.050) × 10⁻⁵.

The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the B⁰ → D̅⁰K⁺K⁻ normalisation channel. The last uncertainty in the B⁰_sresult is due to the limited knowledge of the fragmentation fraction ratio, f_s/f_d. The significance for the B^s₀and B⁰ signals is larger than 10 σ. The ratio of the helicity amplitudes which governs the angular distribution of the D_s1(2536)⁻ → D̅*(2007)⁰K⁻ decay is determined from the data. The ratio of the S- and D-wave amplitudes is found to be 1.11 ± 0.15 ± 0.06 and the phase difference between them 0.70 ± 0.09 ± 0.04 rad, where the first uncertainty is statistical and the second systematic.

Original language	English
Article number	106
Number of pages	25
Journal	JHEP
Volume	2023
Issue number	10
DOIs	https://doi.org/10.1007/JHEP10(2023)106
Publication status	Published - 17 Oct 2023

Bibliographical note

Acknowledgments:
We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

Keywords

B Physics
Branching fraction
Flavour Physics
Hadron-Hadron Scattering

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Cite this

@article{842d735b6f3845df8cb74af9eda3a9d9,

title = "Observation of the decays B0(s) → Ds1(2536)∓K±",

abstract = "This paper reports the observation of the decays B0(s) → Ds1(2536)∓K± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The branching fractions of these decays are measured relative to the normalisation channel B0 → D̅0K+K−. The Ds1(2536)− meson is reconstructed in the D̅*(2007)0K− decay channel and the products of branching fractions are measured to beB (B0s → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5,B (B0 → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (0.510 ± 0.021 ± 0.036 ± 0.050) × 10−5.The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the B0 → D̅0K+K− normalisation channel. The last uncertainty in the B0s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The significance for the Bs0 and B0 signals is larger than 10 σ. The ratio of the helicity amplitudes which governs the angular distribution of the Ds1(2536)− → D̅*(2007)0K− decay is determined from the data. The ratio of the S- and D-wave amplitudes is found to be 1.11 ± 0.15 ± 0.06 and the phase difference between them 0.70 ± 0.09 ± 0.04 rad, where the first uncertainty is statistical and the second systematic.",

keywords = "B Physics, Branching fraction, Flavour Physics, Hadron-Hadron Scattering",

author = "{LHCb Collaboration} and Daniel Johnson and Cristina Lazzeroni and Marcus Madurai and Niladribihari Sahoo and Mark Slater and Paul Swallow and Daniel Thompson and Nigel Watson",

note = "Acknowledgments: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Sk{\l}odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R{\'e}gion Auvergne-Rh{\^o}ne-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracci{\'o}n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).",

year = "2023",

month = oct,

day = "17",

doi = "10.1007/JHEP10(2023)106",

language = "English",

volume = "2023",

journal = "JHEP",

issn = "1126-6708",

publisher = "Springer",

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TY - JOUR

T1 - Observation of the decays B0(s) → Ds1(2536)∓K±

AU - LHCb Collaboration

AU - Johnson, Daniel

AU - Lazzeroni, Cristina

AU - Madurai, Marcus

AU - Sahoo, Niladribihari

AU - Slater, Mark

AU - Swallow, Paul

AU - Thompson, Daniel

AU - Watson, Nigel

N1 - Acknowledgments: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland) and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

PY - 2023/10/17

Y1 - 2023/10/17

N2 - This paper reports the observation of the decays B0(s) → Ds1(2536)∓K± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The branching fractions of these decays are measured relative to the normalisation channel B0 → D̅0K+K−. The Ds1(2536)− meson is reconstructed in the D̅*(2007)0K− decay channel and the products of branching fractions are measured to beB (B0s → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5,B (B0 → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (0.510 ± 0.021 ± 0.036 ± 0.050) × 10−5.The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the B0 → D̅0K+K− normalisation channel. The last uncertainty in the B0s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The significance for the Bs0 and B0 signals is larger than 10 σ. The ratio of the helicity amplitudes which governs the angular distribution of the Ds1(2536)− → D̅*(2007)0K− decay is determined from the data. The ratio of the S- and D-wave amplitudes is found to be 1.11 ± 0.15 ± 0.06 and the phase difference between them 0.70 ± 0.09 ± 0.04 rad, where the first uncertainty is statistical and the second systematic.

AB - This paper reports the observation of the decays B0(s) → Ds1(2536)∓K± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The branching fractions of these decays are measured relative to the normalisation channel B0 → D̅0K+K−. The Ds1(2536)− meson is reconstructed in the D̅*(2007)0K− decay channel and the products of branching fractions are measured to beB (B0s → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5,B (B0 → Ds1(2536)∓K±) × B (Ds1(2536)− → D̅∗(2007)0K−)= (0.510 ± 0.021 ± 0.036 ± 0.050) × 10−5.The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the B0 → D̅0K+K− normalisation channel. The last uncertainty in the B0s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The significance for the Bs0 and B0 signals is larger than 10 σ. The ratio of the helicity amplitudes which governs the angular distribution of the Ds1(2536)− → D̅*(2007)0K− decay is determined from the data. The ratio of the S- and D-wave amplitudes is found to be 1.11 ± 0.15 ± 0.06 and the phase difference between them 0.70 ± 0.09 ± 0.04 rad, where the first uncertainty is statistical and the second systematic.

KW - B Physics

KW - Branching fraction

KW - Flavour Physics

KW - Hadron-Hadron Scattering

U2 - 10.1007/JHEP10(2023)106

DO - 10.1007/JHEP10(2023)106

M3 - Article

SN - 1126-6708

VL - 2023

JO - JHEP

JF - JHEP

IS - 10

M1 - 106

ER -