Measurement of the Dynamics of the Decays D s + → η ( ' ) e + ν e

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doi:10.1103/PhysRevLett.122.121801

Title: Measurement of the Dynamics of the Decays $D_{s}^{+} \to η^{(')} e^{+} ν_{e}$

Journal Article · Mon Mar 25 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.121801· OSTI ID:1503388

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Begzsuren, K.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

Using $${e}^{+}{e}^{{-}}$$ annihilation data corresponding to an integrated luminosity of $$3.19\text{ }\text{ }{\mathrm{fb}}^{{-}1}$$ collected at a center-of-mass energy of 4.178 GeV with the BESIII detector, we measure the absolute branching fractions $${\mathcal{B}}_{{D}_{s}^{+}{\rightarrow}{\eta}{e}^{+}{{\nu}}_{e}}=(2.323\pm{}{0.063}_{\text{stat}}\pm{}{0.063}_{\text{syst}})%$$ and $${\mathcal{B}}_{{D}_{s}^{+}{\rightarrow}{{\eta}}^{{'}}{e}^{+}{{\nu}}_{e}}=(0.824\pm{}{0.073}_{\text{stat}}\pm{}{0.027}_{\text{syst}})%$$ via a tagged analysis technique, where one $${D}_{s}$$ is fully reconstructed in a hadronic mode. Combining these measurements with previous BESIII measurements of $${\mathcal{B}}_{{D}^{+}{\rightarrow}{{\eta}}^{({'})}{e}^{+}{{\nu}}_{e}}$$, the $${\eta}{-}{{\eta}}^{{'}}$$ mixing angle in the quark flavor basis is determined to be $${{\phi}}_{P}=(40.1\pm{}2.{1}_{\text{stat}}\pm{}0.{7}_{\text{syst}})^\circ{}$$. From the first measurements of the dynamics of $${D}_{s}^{+}{\rightarrow}{{\eta}}^{({'})}{e}^{+}{{\nu}}_{e}$$ decays, the products of the hadronic form factors $${f}_{+}^{{{\eta}}^{({'})}}(0)$$ and the Cabibbo-Kobayashi-Maskawa matrix element $$|{V}_{\mathrm{cs}}|$$ are determined with different form factor parametrizations. For the two-parameter series expansion, the results are $${f}_{+}^{{\eta}}(0)|{V}_{cs}|=0.4455\pm{}{0.0053}_{\text{stat}}\pm{}{0.0044}_{\text{syst}}$$ and $${f}_{+}^{{{\eta}}^{{'}}}(0)|{V}_{\mathrm{cs}}|=0.477\pm{}{0.049}_{\text{stat}}\pm{}{0.011}_{\text{syst}}$$.

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Research Organization:: Indiana Univ., Bloomington, IN (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Hawaii, Honolulu, HI (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC0010118; SC0010504; SC0012069

OSTI ID:: 1503388

Alternate ID(s):: OSTI ID: 1504144

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 122 Journal Issue: 12; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
branching fraction
form factors
leptonic
semileptonic & radiative decays
quark mixing
charmed mesons
lepton colliders

Title: Measurement of the Dynamics of the Decays D s + → η ( ' ) e + ν e

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Title: Measurement of the Dynamics of the Decays $D_{s}^{+} \to η^{(')} e^{+} ν_{e}$