Q. He

An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

We have developed an event mixing technique to observe Bose-Einstein correlations (BEC) between two identical neutral pions produced in photo-induced reactions in the non-perturbative QCD energy region. It is found that the missing-mass consistency cut and the pion-energy cut are essential for the event mixing method to effectively extract BEC observables. A Monte Carlo (MC) simulation is used to validate these constraints and confirms the efficiency of this method. Our work paves the way for similar BEC studies at lower energies where the multiplicity of emitted bosons is limited.

Study of non-strange dibaryon resonances via coherent double neutral-pion photoproduction on the deuteron

The cross sections was measured for coherent double neutral-pion photoproduction on the deuteron using the tagged photon beams from the 0.9 and 1.2 GeV primary electron beams at the Research Center for Electron Photon Science, Tohoku University, Japan. The four-momenta of the four photons from the two π0 decays and deuteron are measured with the FOREST detector, and theγd → π0π0d reaction was identified using 6-constraint kinematic fit (energy and threemomentum conservation, and two π0 masses). The total cross section is found to be 18 .4±9.2 nb for the d∗(2380) dibaryon resonance at Wγd = 2.37 GeV, which is a candidate of the isoscalar ∆∆ quasi-bound state D03, in theγd → π0π0d reaction. The measured excitation function is consistent with the existing theoretical calculation for this reaction. At high incident energies, π0d invariant-mass distributions show a peak at approximately 2.15 GeV, which can be attributed to a N∆ quasi-bound state D12. In this contribution, the properties (mass, width, and decay angular distribution) of this peak is presented.

Simultaneous Photoproduction Of Neutral And Charged Pions On The Deuteron At ELPH

We have measured the cross sections for

π0 and η Photoproduction on the Deuteron at ELPH, Tohoku University

\pi^0\pi^\pm

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

photoproduction on the nucleon in the deuteron with an electromagnetic calorimeter system, FOREST, at the Research Center for Electron Photon Science, Tohoku University, Japan. The incident photon energy ranges from 570 to 1150 MeV, corresponding to the

Meson Photoproduction Experiments at ELPH, Tohoku University

\gamma N

Study for the ω–N Interaction Through ω Photoproduction Near the Threshold

center of mass,

K0Λ Photoproduction Studied with an Electromagnetic Calorimeter FOREST

W_{\gamma N}

Double neutral pion photoproduction off the proton with FOREST at ELPH

, from 1400 to 1750 MeV. The baryon resonances coupling to

Pseudoscalar mesons detected with a BGO calorimeter at LEPS2

\rho^+ n