S. Lacaprara

Searches for Charged-Lepton-Flavor Violation in χ b J ( 1 P ) Decays

M. Abumusabh, I. Adachi, Agrim Aggarwal, L. Aggarwal et autres

We report the first searches for charged-lepton-flavor violation in decays of χ_{bJ}(1P) (J=0, 1, and 2) to a pair of charged leptons using 158 million ϒ(2S) decays collected with the Belle detector in e^{+}e^{-} collisions at the KEKB collider. No significant signal …

Study of e+e− → π+π−Υ(1D) at Belle II

M. Abumusabh, I. Adachi, Agrim Aggarwal, L. Aggarwal et autres

A bstract The bottomonium spectrum, consisting of bound states of a b quark and an anti- b quark, provides an excellent laboratory for probing quantum chromodynamics in the non-perturbative regime. While S and P-wave bottomonium states are well studied experimentally, information on …

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Search for the Decay B + → K + τ + τ − Using Data from the Belle and Belle II Experiments

M. Abumusabh, I. Adachi, K. Adamczyk, Agrim Aggarwal et autres

We report a search for the rare decay B^{+}→K^{+}τ^{+}τ^{-} using 1.2×10^{9} ϒ(4S) mesons produced near threshold in electron-positron collisions and collected by the Belle and Belle II experiments. We fully reconstruct the hadronic decay of one B meson produced in the ϒ(4S)→B^{+}B^{-} …

Study of e + e − → h + h − J / ψ ( h = π , K , p ) via initial-state radiation at Belle II

M. Abumusabh, I. Adachi, Agrim Aggarwal, L. Aggarwal et autres

Using a data sample of 427.9 fb − 1 collected by the Belle II detector at or near the ϒ ( 4 S ) and ϒ ( 10753 ) resonances, the cross sections for e + e − → h + h …

Observation of the Radiative Decay D s 0 * ( 2317 ) + → D s * + γ

M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed et autres

We report the first observation of the radiative decay D_{s0}^{*}(2317)^{+}→D_{s}^{*+}γ with a statistical significance exceeding 10 standard deviations. The signal is observed in the continuum e^{+}e^{-}→cc[over ¯] process, using combined data samples of 980.4 fb^{-1} from Belle and 427.9 fb^{-1} from Belle …

Search for Feebly Interacting Particles in B Decays with Missing Energy at Belle

M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed et autres

We present a search for an invisible hidden-sector particle X_{inv}, produced in B^{0}→D[over ¯]^{0}X_{inv} and B^{±}→hX_{inv} decays, where h=π^{±}, K^{±}, D_{s}^{±}, p^{±}. The search is performed using e^{+}e^{-} collision data recorded with the Belle detector, corresponding to 711 fb^{-1}. No significant signal …

Study of B + → μ + ν μ decays at Belle and Belle II

M. Abumusabh, I. Adachi, K. Adamczyk, Agrim Aggarwal et autres

We report a measurement of the branching fraction for the leptonic decay B + → μ + ν μ . This work presents the first B + → μ + ν μ result using Belle II data, an updated Belle measurement that …

Improved measurement of Born cross sections for χbJ ω and χbJ (π+π−π0)non−ω (J = 0, 1, 2) at Belle and Belle II

I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara et autres

A bstract We study the processes χ bJ ω and χ bJ ( π + π − π 0 ) non −ω ( J = 0, 1, 2) at center-of-mass energies $$\sqrt{s}$$ from 10.73 to 11.02 GeV using a 142 . 5 …

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First Search for B → X s ν ν ¯ Decays

M. Abumusabh, I. Adachi, K. Adamczyk, L. Aggarwal et autres

We report the first search for the flavor-changing neutral-current decays B→X_{s}νν[over ¯], where X_{s} is a hadronic system with strangeness equal to 1, in data collected with the Belle II detector at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. The data sample corresponds to …

Observation of e + e − → η ϒ ( 2 S ) and search for e + e − → η ϒ ( 1 S ) , γ X b at s near 10.75 GeV

I. Adachi, L. Aggarwal, H. Ahmed, Y. H. Ahn et autres

We present an analysis of the processes e + e − → η ϒ ( 1 S ) , η ϒ ( 2 S ) , and γ X b with X b → π + π − χ b J , …

Search for e + e − → γ χ b J ( J = 0 , 1, 2) near s = 10.746 GeV at Belle II

M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed et autres

We search for the e + e − → γ χ b J ( J = 0 , 1, 2) processes at center-of-mass energies s = 10.653 , 10.701, 10.746, and 10.804 GeV. These data were collected with the Belle II detector …

Measurement of time-dependent CP asymmetries in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays at Belle and Belle II

M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed et autres

A bstract We present a measurement of the time-dependent CP asymmetry in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays using a data set of 365 fb − 1 recorded by the Belle II experiment and the final data set of 711 fb − …

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