Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays

LHCb collaboration

doi:10.1103/PhysRevLett.134.061801

Measurement of the Branching Fraction Ratios R(D⁺) and R(D*⁺) Using Muonic τ Decays

LHCb collaboration

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The branching fraction ratios of (Formula presented) and (Formula presented) decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of (Formula presented) collected by the LHCb experiment in proton-proton collisions at (Formula presented). The reconstructed final states are formed by combining (Formula presented) mesons with (Formula presented) candidates, where the (Formula presented) is reconstructed via the (Formula presented) decay. The results are (Formula presented), (Formula presented), where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of (Formula presented) and are compatible with the standard model.

Original language	English
Article number	061801
Number of pages	13
Journal	Physical Review Letters
Volume	134
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.134.061801
Publication status	Published - 10 Feb 2025

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10.1103/PhysRevLett.134.061801Licence: CC BY

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@article{ff67cdbd0be849c0b54619acc54cf220,

title = "Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays",

abstract = "The branching fraction ratios of (Formula presented) and (Formula presented) decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of (Formula presented) collected by the LHCb experiment in proton-proton collisions at (Formula presented). The reconstructed final states are formed by combining (Formula presented) mesons with (Formula presented) candidates, where the (Formula presented) is reconstructed via the (Formula presented) decay. The results are (Formula presented), (Formula presented), where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of (Formula presented) and are compatible with the standard model.",

author = "U. Egede and Y. Fujii and T. Hadavizadeh and Henderson, \{R. D.L.\} and Lane, \{J. J.\} and Liu, \{F. L.\} and M. Monk and R. Song and Walton, \{E. J.\} and Ward, \{J. A.\} and Bediaga, \{I. B.\} and \{Camargo Magalhaes\}, P. and \{Cruz Torres\}, M. and \{De Freitas Carneiro Da Graca\}, U. and \{De Miranda\}, \{J. M.\} and \{dos Reis\}, \{A. C.\} and Falcao, \{L. N.\} and A. Gomes and A. Massafferri and L. Santoro and \{Sundfeld Lima\}, \{D. S.\} and \{Torres Machado\}, D. and S. Amato and \{De Paula\}, L. and \{Ferreira Rodrigues\}, F. and M. Gandelman and A. Hicheur and Lopes, \{J. H.\} and I. Nasteva and P. Nogarolli and \{Otalora Goicochea\}, \{J. M.\} and E. Polycarpo and Rangel, \{M. S.\} and \{Souza De Paula\}, B. and C. Dong and G. Gong and X. Hu and Y. Kang and A. Li and Z. Lian and Ma, \{G. M.\} and Meng, \{F. M.\} and H. Mu and N. Qin and S. Qu and Y. Song and Y. Tan and Tou, \{D. Y.\} and J. Wang and Z. Wang and \{LHCb collaboration\} and Keri Vos and \{da silva Bolognani\}, Carolina and \{C{\'a}mpora P{\'e}rez\}, \{Daniel Hugo\} and \{de Vries\}, Jacco and \{Lucio Martinez\}, Miriam and Marcel Merk and Davide Nicotra and Gerco Onderwater and Chris Pawley",

note = "Funding Information: We would like to thank Dean Robinson and Michele Papucci for extensive discussions and technical advice on the use of the HAMMER tool. 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), and Polish WLCG (Poland). 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); 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); Minciencias (Colombia); EPLANET, Marie Sk\textbackslash{}u0142odowska-Curie Actions, ERC, and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\textbackslash{}u00E9gion Auvergne-Rh\textbackslash{}u00F4ne-Alpes (France); AvH Foundation (Germany); ICSC (Italy); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracci\textbackslash{}u00F3n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: {\textcopyright} 2025 CERN, for the LHCb Collaboration.",

year = "2025",

month = feb,

day = "10",

doi = "10.1103/PhysRevLett.134.061801",

language = "English",

volume = "134",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays

AU - Egede, U.

AU - Fujii, Y.

AU - Hadavizadeh, T.

AU - Henderson, R. D.L.

AU - Lane, J. J.

AU - Liu, F. L.

AU - Monk, M.

AU - Song, R.

AU - Walton, E. J.

AU - Ward, J. A.

AU - Bediaga, I. B.

AU - Camargo Magalhaes, P.

AU - Cruz Torres, M.

AU - De Freitas Carneiro Da Graca, U.

AU - De Miranda, J. M.

AU - dos Reis, A. C.

AU - Falcao, L. N.

AU - Gomes, A.

AU - Massafferri, A.

AU - Santoro, L.

AU - Sundfeld Lima, D. S.

AU - Torres Machado, D.

AU - Amato, S.

AU - De Paula, L.

AU - Ferreira Rodrigues, F.

AU - Gandelman, M.

AU - Hicheur, A.

AU - Lopes, J. H.

AU - Nasteva, I.

AU - Nogarolli, P.

AU - Otalora Goicochea, J. M.

AU - Polycarpo, E.

AU - Rangel, M. S.

AU - Souza De Paula, B.

AU - Dong, C.

AU - Gong, G.

AU - Hu, X.

AU - Kang, Y.

AU - Li, A.

AU - Lian, Z.

AU - Ma, G. M.

AU - Meng, F. M.

AU - Mu, H.

AU - Qin, N.

AU - Qu, S.

AU - Song, Y.

AU - Tan, Y.

AU - Tou, D. Y.

AU - Wang, J.

AU - Wang, Z.

AU - LHCb collaboration

AU - Vos, Keri

AU - da silva Bolognani, Carolina

AU - Cámpora Pérez, Daniel Hugo

AU - de Vries, Jacco

AU - Lucio Martinez, Miriam

AU - Merk, Marcel

AU - Nicotra, Davide

AU - Onderwater, Gerco

AU - Pawley, Chris

N1 - Funding Information: We would like to thank Dean Robinson and Michele Papucci for extensive discussions and technical advice on the use of the HAMMER tool. 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), and Polish WLCG (Poland). 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); 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); Minciencias (Colombia); EPLANET, Marie Sk\u0142odowska-Curie Actions, ERC, and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\u00E9gion Auvergne-Rh\u00F4ne-Alpes (France); AvH Foundation (Germany); ICSC (Italy); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracci\u00F3n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: © 2025 CERN, for the LHCb Collaboration.

PY - 2025/2/10

Y1 - 2025/2/10

N2 - The branching fraction ratios of (Formula presented) and (Formula presented) decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of (Formula presented) collected by the LHCb experiment in proton-proton collisions at (Formula presented). The reconstructed final states are formed by combining (Formula presented) mesons with (Formula presented) candidates, where the (Formula presented) is reconstructed via the (Formula presented) decay. The results are (Formula presented), (Formula presented), where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of (Formula presented) and are compatible with the standard model.

AB - The branching fraction ratios of (Formula presented) and (Formula presented) decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of (Formula presented) collected by the LHCb experiment in proton-proton collisions at (Formula presented). The reconstructed final states are formed by combining (Formula presented) mesons with (Formula presented) candidates, where the (Formula presented) is reconstructed via the (Formula presented) decay. The results are (Formula presented), (Formula presented), where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of (Formula presented) and are compatible with the standard model.

U2 - 10.1103/PhysRevLett.134.061801

DO - 10.1103/PhysRevLett.134.061801

M3 - Article

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 061801

ER -

Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays

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Measurement of the Branching Fraction Ratios R(D⁺) and R(D*⁺) Using Muonic τ Decays