Search Results - "Narwal, D."
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Search for a τ + τ − Resonance in e + e − → μ + μ − τ + τ − Events with the Belle II Experiment
Published in Physical review letters (22-09-2023)“…We report the first search for a nonstandard-model resonance decaying into τ pairs in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} events in the 3.6-10 GeV/c^{2} mass…”
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2
First Measurement of R(X_{τ/ℓ}) as an Inclusive Test of the b→cτν Anomaly
Published in Physical review letters (24-05-2024)“…We measure the tau-to-light-lepton ratio of inclusive B-meson branching fractions R(X_{τ/ℓ})≡B(B→Xτν)/B(B→Xℓν), where ℓ indicates an electron or muon, and…”
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3
Measurement of Angular Coefficients of Bover ¯→D^{}ℓνover ¯_{ℓ}: Implications for |V_{cb}| and Tests of Lepton Flavor Universality
Published in Physical review letters (27-09-2024)“…We measure the complete set of angular coefficients J_{i} for exclusive B[over ¯]→D^{*}ℓν[over ¯]_{ℓ} decays (ℓ=e, μ). Our analysis uses the full 711 fb^{-1}…”
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4
Determination of the CKM angle ϕ3 from a combination of Belle and Belle II results
Published in The journal of high energy physics (22-10-2024)“…A bstract We report a determination of the CKM angle ϕ 3 , also known as γ , from a combination of measurements using samples of up to 711 fb − 1 from the…”
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5
First measurement of the Λc+→ pη′ decay
Published in The journal of high energy physics (01-03-2022)“…A bstract We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λ c + → pη ′ with η ′ → ηπ + π − , using a…”
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6
Search for lepton-flavor-violating τ−→ μ−μ+μ− decays at Belle II
Published in The journal of high energy physics (11-09-2024)“…A bstract We present the result of a search for the charged-lepton-flavor violating decay τ − → μ − μ + μ − using a 424 fb − 1 sample of data recorded by the…”
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7
Test of light-lepton universality in τ decays with the Belle II experiment
Published in The journal of high energy physics (26-08-2024)“…A bstract We present a measurement of the ratio R μ = B τ − → μ − ν ¯ μ ν τ / B τ − → e − ν ¯ e ν τ of branching fractions B of the τ lepton decaying to muons…”
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8
Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II
Published in The journal of high energy physics (12-07-2024)“…A bstract We present an analysis of the process e + e − → π + π − Υ( nS ) (where n = 1, 2, or 3) reconstructed in 19 . 6 fb − 1 of Belle II data during a…”
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9
Search for the double-charmonium state with ηcJ/ψ at Belle
Published in The journal of high energy physics (18-08-2023)“…A bstract We measure the cross section of e + e − → η c J/ψ at the Υ( nS )( n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data…”
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10
Search for a Light Higgs Boson in Single-Photon Decays of ϒ(1S) Using ϒ(2S)→π^{+}π^{-}ϒ(1S) Tagging Method
Published in Physical review letters (25-02-2022)“…We search for a light Higgs boson (A^{0}) decaying into a τ^{+}τ^{-} or μ^{+}μ^{-} pair in the radiative decays of ϒ(1S). The production of ϒ(1S) mesons is…”
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11
Erratum to: Combined analysis of Belle and Belle II data to determine the CKM angle ϕ3 using B+→ D(KS0h+h−)h+ decays
Published in The journal of high energy physics (07-12-2022)Get full text
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Measurement of the energy dependence of the e+e−→BB¯, BB¯∗, and B∗B¯∗ cross sections at Belle II
Published in The journal of high energy physics (15-10-2024)“…A bstract We report measurements of the e + e − → B B ¯ , B B ¯ ∗ , and B ∗ B ¯ ∗ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using…”
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13
Measurement of the branching fractions of B¯ → D()K−KS∗0 and B¯ → D()Ds− decays at Belle II
Published in The journal of high energy physics (26-08-2024)“…We present measurements of the branching fractions of eight B ¯ 0 → D (*)+ K − K S ∗ 0 , B − → D (*)0 K − K S ∗ 0 decay channels. The results are based on data…”
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14
First Measurement of the Michel Parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} Decay at Belle
Published in Physical review letters (14-07-2023)“…We report the first measurement of the Michel parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decay with a new method proposed just recently. The…”
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15
Determination of $|V_{ub}|$ from simultaneous measurements of untagged $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0 \ell^+\nu_{\ell}$ decays
Published 24-07-2024“…We present a measurement of $|V_{ub}|$ from a simultaneous study of the charmless semileptonic decays $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0…”
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16
Measurement of branching fractions, CP asymmetry, and isospin asymmetry for $\boldsymbol{B\rightarrow\rho\gamma}$ decays using Belle and Belle II data
Published 12-07-2024“…We present measurements of $B^{+}\rightarrow\rho^{+}\gamma$ and $B^{0}\rightarrow\rho^{0}\gamma$ decays using a combined data sample of $772 \times 10^6$…”
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Measurement of $CP$ asymmetries in $B^0 \to K^0_S \pi^0 \gamma$ decays at Belle II
Published 12-07-2024“…We report measurements of time-dependent $CP$ asymmetries in $B^0 \to K^0_S \pi^0 \gamma$ decays based on a data sample of $(388\pm6)\times10^6$ $B\bar{B}$…”
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18
Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
Published 01-07-2024“…A series of data samples was collected with the Belle~II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated…”
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Measurement of the branching fractions of $\bar{B}\to D^{()} K^- K^{()0}_{(S)}$ and $\bar{B}\to D^{()}D_s^{-}$ decays at Belle II
Published 10-06-2024“…J. High Energ. Phys. 08 (2024) 206 We present measurements of the branching fractions of eight $\overline B{}^0\to D^{(*)+} K^- K^{(*)0}_{(S)}$, $B^{-}\to…”
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20
Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data
Published 30-05-2024“…Phys. Rev. D 110, L031106 (2024) We report the result of a search for the rare decay $B^{0} \to \gamma \gamma$ using a combined dataset of $753\times10^{6}$…”
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