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Creators/Authors contains: "Bahinipati, S."

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  1. A<sc>bstract</sc> We report a search for the charged-lepton flavor violation in Υ(2S) →ℓτ±(ℓ=e, μ) decays using a 25 fb−1Υ(2S) sample collected by the Belle detector at the KEKBe+easymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($$ \mathcal{B} $$ B ) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$ B (Υ(2S)→ μτ±)<0.23×10−6and$$ \mathcal{B} $$ B (Υ(2S)→ eτ±)<1.12×10−6
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  2. We measure the branching fraction of the decay B D 0 ρ ( 770 ) using data collected with the Belle II detector. The data contain 387 million B B ¯ pairs produced in e + e collisions at the ϒ ( 4 S ) resonance. We reconstruct 8360 ± 180 decays from an analysis of the distributions of the B energy and the ρ ( 770 ) helicity angle. We determine the branching fraction to be ( 0.939 ± 0.021 ( stat ) ± 0.050 ( syst ) ) % , in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two. Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025
  3. We report on a search for a resonance X decaying to a pair of muons in e + e μ + μ X events in the 0.212 9.000 GeV / c 2 mass range, using 178 fb 1 of data collected by the Belle II experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of X beyond the standard model: a Z vector boson in the L μ L τ model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the L μ L τ model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below 6 GeV / c 2 , the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the L μ L τ model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search. Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025
  4. Free, publicly-accessible full text available January 1, 2026
  5. A search is presented for an extended Higgs sector with two new particles, X and ϕ , in the process X ϕ ϕ ( γ γ ) ( γ γ ) . Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data at s = 13 TeV collected with the CMS detector, corresponding to an integrated luminosity of 138 fb 1 . No evidence of such resonances is seen. Upper limits are set on the production cross section for m X between 300 and 3000 GeV and m ϕ / m X between 0.5% and 2.5%, representing the most sensitive search in this channel. © 2025 CERN, for the CMS Collaboration2025CERN 
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    Free, publicly-accessible full text available January 1, 2026
  6. We measure the tau-to-light-lepton ratio of inclusive B -meson branching fractions R ( X τ / ) B ( B X τ ν ) / B ( B X ν ) , where indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed B meson and a charged lepton candidate from 189 fb 1 of electron-positron collision data collected with the Belle II detector. We find R ( X τ / ) = 0.228 ± 0.016 ( stat ) ± 0.036 ( syst ) , in agreement with standard-model expectations. This is the first direct measurement of R ( X τ / ) . Published by the American Physical Society2024 
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  7. A<sc>bstract</sc> We present a search for the lepton-flavor-violating decays$$ {B}_s^0 $$ B s 0 →ℓτ±, whereℓ=e, μ, using the full data sample of 121 fb−1collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energye+ecollider. We use$$ {B}_s^0{\overline{B}}_s^0 $$ B s 0 B ¯ s 0 events in which one$$ {B}_s^0 $$ B s 0 meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for$$ {B}_s^0 $$ B s 0 → ℓτ±decays and set upper limits on their branching fractions at 90% confidence level as$$ \mathcal{B} $$ B ($$ {B}_s^0 $$ B s 0 → eτ±)<14×10−4and$$ \mathcal{B} $$ B ($$ {B}_s^0 $$ B s 0 → μτ±)<7.3×10−4. Our result represents the first upper limit on the$$ {B}_s^0 $$ B s 0 → eτ±decay rate. 
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