M. Sumihama

works on

few-body systems 1 hypernuclear spectroscopy 1 kaon-nucleon interactions 1 photoproduction 1 quasi-bound states 1

From the 1 of 56 linked papers with an AI index.

activity

20242026

collaborators

56 papers

hep-ex2026

Search for the $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decay

Belle, Belle II Collaborations, : +432

We present the first search for $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decays. We look for signal decays in $B^{0} B ˉ^{0}$ events produced in asymmetric-energy electron-positron collisions.…

nucl-ex2026

Evidence for a $K ˉ N N$ quasi-bound state in the $I^^{3} d \to K^{0} I^ p$ reaction

R. Kobayakawa, J. K. Ahn, S. Ajimura +34

The authors measured the γd → K⁰Λp reaction with the LEPS2 spectrometer and observed a localized enhancement below the K⁻pp threshold, which they interpret as evidence for a K̄NN q…

hep-ex2026

Search for axion-like particles decaying to two photons at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +450

Axion-like particles (ALPs) are predicted in many extensions of the Standard Model and provide a well-motivated portal between visible and hidden sectors through their coupling to…

hep-ex2026

Searches for charged-lepton-flavor violation in $χ_{b J} (1 P)$ decays

Belle, Belle II Collaborations, : +425

We report the first searches for charged-lepton-flavor violation in decays of $χ_{b J} (1 P)$ ( $J = 0, 1,$ and $2$ ) to a pair of charged leptons using 158 million $Υ (2 S)$ decays collect…

hep-ex2026

First measurement of the masses of the $I^¥_{1} (1 D)$ and $I^¥_{3} (1 D)$ states and the energy dependence of the cross sections for $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$

Belle, Belle II Collaborations, : +398

We study the processes $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$ at center-of-mass energies $s$ =(10.73 -- 11.02) GeV using a $142.5 fb^{- 1}$ data sampl…

hep-ex2026

Study of $B^{+} \to I^¼^{+} I^½_{I^} ¼$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +412

We report a measurement of the branching fraction for the leptonic decay $B^{+} \to I^¼^{+} I^½_{I^} ¼$ . This work presents the first $B^{+} \to I^¼^{+} I^½_{I^} ¼$ result using Belle~II data, an updated Be…

Search for the B0→KS0​I¨+I¨− decay

Evidence for a KˉNN quasi-bound state in the I^3d→K0I^p reaction

Search for axion-like particles decaying to two photons at Belle II

Searches for charged-lepton-flavor violation in χbJ​(1P) decays

First measurement of the masses of the I^¥1​(1D) and I^¥3​(1D) states and the energy dependence of the cross sections for e+e−→I^¥J​(1D)I^⋅ and e+e−→I^¥J​(1D)I¨+I¨−

Study of B+→I^¼+I^½I^​¼ decays at Belle and Belle II

Search for the $B^{0} \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ decay

Evidence for a $K ˉ N N$ quasi-bound state in the $I^^{3} d \to K^{0} I^ p$ reaction

Searches for charged-lepton-flavor violation in $χ_{b J} (1 P)$ decays

First measurement of the masses of the $I^¥_{1} (1 D)$ and $I^¥_{3} (1 D)$ states and the energy dependence of the cross sections for $e^{+} e^{-} \to I^¥_{J} (1 D) I^\cdot$ and $e^{+} e^{-} \to I^¥_{J} (1 D) I ¨ ^{+} I ¨ ^{-}$

Study of $B^{+} \to I^¼^{+} I^½_{I^} ¼$ decays at Belle and Belle II