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First measurement of T -odd moments in D0→KS0π+π−π0 decays
Prasanth, K.,Libby, J.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Barberio, E.,Berger, M.,Bhardwaj, American Physical Society 2017 Physical Review D Vol.95 No.9
<P>We report the first measurement of the T-odd moments in the decay D-0 -> K-S(0) pi + pi(-)pi(0) from a data sample corresponding to an integrated luminosity of 966 fb(-1) collected by the Belle experiment at the KEKB asymmetric-energy e(+)e(-) collider. From these moments we determine the CP-violation-sensitive asymmetry a(CP)(T-odd) = [-0.28 +/- 1.38 (stat.)(-0.76)(+0.23) (syst.)] x 10(-3) , which is consistent with no CP violation. In addition, we perform a(CP)(T-odd) measurements in different regions of the D-0 -> K-S(0) pi + pi(-)pi(0) phase space; these are also consistent with no CP violation.</P>
T. Abe,N. Yamane,T. Nishiguchi,H. Kozeni,T. Yoshida,M. Adachi,H. Kasada,K. Ando 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
A practical blue waveguide Stark-eect optical modulator using ZnSe/ZnMgSSe asymmetric cou- pled quantum wells (ACQWs) has been demonstrated. The device structure is a p-i-n diode with a 50 periods ZnSe(6 ML)/ZnMgSSe(2 ML)/ZnSe(12 ML) ACQW active region grown on an n-GaAs substrate by using molecular beam epitaxy (MBE). The ridge-shape devices are fabricated by wet- etching with a fairly-short eective modulation waveguide length of 13 m and are located under a top stripe-electrode. The waveguide modulator exhibits a high modulation depth of 95 % (contrast ratio: 13 dB) under reverse bias condition of 68 V at room temperature at an operating wavelength of 458 nm. A practical blue waveguide Stark-eect optical modulator using ZnSe/ZnMgSSe asymmetric cou- pled quantum wells (ACQWs) has been demonstrated. The device structure is a p-i-n diode with a 50 periods ZnSe(6 ML)/ZnMgSSe(2 ML)/ZnSe(12 ML) ACQW active region grown on an n-GaAs substrate by using molecular beam epitaxy (MBE). The ridge-shape devices are fabricated by wet- etching with a fairly-short eective modulation waveguide length of 13 m and are located under a top stripe-electrode. The waveguide modulator exhibits a high modulation depth of 95 % (contrast ratio: 13 dB) under reverse bias condition of 68 V at room temperature at an operating wavelength of 458 nm.
Observation of D0→ρ0γ and Search for CP Violation in Radiative Charm Decays
Nanut, T.,Zupanc, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Behera, P.,Bhardwaj, V.,Biswal, J.,Bondar, A.,Bozek American Physical Society 2017 Physical Review Letters Vol.118 No.5
<P>We report the first observation of the radiative charm decay D-0 -> rho(0)gamma and the first search for CP violation in decays D-0 -> rho(0)gamma, phi gamma, and (K) over bar (*0)(892)gamma, using a data sample of 943 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The branching fraction is measured to be B(D-0 -> rho(0)gamma) = (1.77 +/- 0.30 +/- 0.07) x 10(-5), where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries A(CP)(D-0 ->rho(0)gamma) = +0.056 +/- 0.152 +/- 0.006, A(CP)(D-0 -> phi gamma) = -0.094 +/- 0.066 +/- 0.001, and A(CP)(D-0 -> (K) over bar (*0) gamma = -0.003 +/- 0.020 +/- 0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D-0 -> phi gamma) = (2.76 +/- 0.19 +/- 0.10) x 10(-5) and B(D-0 -> (K) over bar (*0) gamma = (4.66 +/- 0.21 +/- 0.21) x 10(-4).</P>
Julius, T.,Sevior, M. E.,Mohanty, G. B.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Barberio, E.,Barrett, M.,Berger, American Physical Society 2017 Physical Review D Vol.96 No.3
<P>We measure the branching fraction and CP violation asymmetry in the decay B-0 -> pi(0)pi(0), using a data sample of 752 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The obtained branching fraction and direct CP asymmetry are B(B -> pi(0)pi(0)) = [1.31 +/- 0.19(stat) +/- 0.19(syst)] x 10(-6) and A(CP) = +0.14 +/- 0.36(stat) +/- 0.10(syst), respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of B-0 -> pi(+)pi(-) and B-+/- -> pi(+/-)pi(0) to exclude the CP-violating parameter phi(2) from the range 15.5 degrees < phi(2) < 75.0 degrees at 95% confidence level.</P>
Measurement of theB¯→Xsγbranching fraction with a sum of exclusive decays
Saito, T.,Ishikawa, A.,Yamamoto, H.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Arinstein, K.,Asner, D. M.,Aushev, T.,Ayad, R.,Bakich, A. M.,Bansal, V.,Bhuyan, B.,Bobrov, A.,Bondar, A.,Bonvicini, American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.5