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Measurement of time-dependent CP asymmetries in B0→KS0ηγ decays
Nakano, H.,Ishikawa, A.,Sumisawa, K.,Yamamoto, H.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bansal, V.,Behera, P.,Beleñ,o, C.,Bhuyan, American Physical Society 2018 Physical Review D Vol.97 No.9
<P>We report a measurement of time-dependent CP violation parameters in B-0 -> K-S(0)eta gamma decays. The study is based on a data sample, containing 772 x 10(6)B(B)over-bar pairs, that was collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain the CP violation parameters of S = -1.32 +/- 0.77(stat) +/- 0.36(syst) and A = -0.48 +/- 0.41(stat) f 0.07(syst) for the invariant mass of the K-S(0)eta system up to 2.1 GeV/c(2).</P>
Measurement ofD0−D¯0mixing and search for indirectCPviolation usingD0→KS0π+π−decays
Peng, T.,Zhang, Z. P.,Abdesselam, A.,Adachi, I.,Aihara, H.,Arinstein, K.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Bakich, A. M.,Bala, A.,Bhardwaj, V.,Bhuyan, B.,Bobrov, A.,Bondar, A.,Bonvicini, American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.9
We report a measurement of D-0-(D) over bar(0) mixing parameters and a search for indirect CP violation through a time-dependent amplitude analysis of D-0 -> K-S(0)pi(+)pi(-) decays. The results are based on 921 fb(-1) of data accumulated with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Assuming CP conservation, we measure the mixing parameters x = (0.56 +/- 0.19(-0.09-0.09)(+0.03+0.06))% and y = (0.30 +/- 0.15(-0.05-0.06)(+0.04+0.03))%, where the errors are statistical, experimental systematic, and systematic due to the amplitude model, respectively. With CP violation allowed, the parameters vertical bar q/p vertical bar = 0.90(-0.15-0.04-0.05)(+0.16+0.05+0.06) and arg(q/p) = (- 6 +/- 11 +/- 3(-4)(+3))degrees are found to be consistent with conservation of CP symmetry in mixing and in the interference between mixing and decay, respectively.
Belle II SVD ladder assembly procedure and electrical qualification
Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, Varghese,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, T.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, T.,Bettarini, S.,Bhuyan, Elsevier 2016 Nuclear instruments & methods in physics research. Vol.824 No.-
<P><B>Abstract</B></P> <P>The Belle II experiment at the SuperKEKB asymmetric <SUP> e + </SUP> <SUP> e − </SUP> collider in Japan will operate at a luminosity approximately 50 times larger than its predecessor (Belle). At its heart lies a six-layer vertex detector comprising two layers of pixelated silicon detectors (PXD) and four layers of double-sided silicon microstrip detectors (SVD). One of the key measurements for Belle II is time-dependent CP violation asymmetry, which hinges on a precise charged-track vertex determination. Towards this goal, a proper assembly of the SVD components with precise alignment ought to be performed and the geometrical tolerances should be checked to fall within the design limits. We present an overview of the assembly procedure that is being followed, which includes the precision gluing of the SVD module components, wire-bonding of the various electrical components, and precision three dimensional coordinate measurements of the jigs used in assembly as well as of the final SVD modules.</P>
Search forB0→π−τ+ντwith hadronic tagging at Belle
Hamer, P.,Frey, A.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Arinstein, K.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Bhuyan, B.,Biswal, J.,Bozek, A.,Bra& American Physical Society 2016 Physical Review D Vol.93 No.3
<P>We search for the process B-0 -> pi(-) tau(+)nu(tau) using the full Belle data set of 711 fb(-1), corresponding to 772 x 10(6)B (B) over bar pairs, collected at the gamma (4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We reconstruct one B meson in a hadronic decay and search for the B-0 -> pi(-)tau(+)nu(tau) process in the remainder of the event. No significant signal is observed and an upper limit of B(B-0 -> pi(-) tau(+)nu(tau)) < 2.5 x 10(-4) is obtained at the 90% confidence level.</P>
Belle-II VXD radiation monitoring and beam abort with sCVD diamond sensors
Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, T.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, T.,Bettarini, S.,Bhuyan, B.,Bil Elsevier 2016 Nuclear instruments & methods in physics research. Vol.824 No.-
<P><B>Abstract</B></P> <P>The Belle-II VerteX Detector (VXD) has been designed to improve the performances with respect to Belle and to cope with an unprecedented luminosity of 8 × <SUP> 10 35 </SUP> <SUP> cm − 2 </SUP> <SUP> s − 1 </SUP> achievable by the SuperKEKB. Special care is needed to monitor both the radiation dose accumulated throughout the life of the experiment and the instantaneous radiation rate, in order to be able to promptly react to sudden spikes for the purpose of protecting the detectors. A radiation monitoring and beam abort system based on single-crystal diamond sensors is now under an active development for the VXD. The sensors will be placed in several key positions in the vicinity of the interaction region. The severe space limitations require a challenging remote readout of the sensors.</P>
Sato, Y.,Iijima, T.,Adamczyk, K.,Aihara, H.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Aziz, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bonvicini American Physical Society 2016 Physical review. D Vol.94 No.7
<P>We report a measurement of the ratio R(D*) = B((B) over bar (0) -> D*(+)tau(-)(nu) over bar (tau))/B((B) over bar (0) -> D*(+)l(-)(nu) over bar (l))where l denotes an electron or a muon. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. We select a sample of B-0(B) over bar (0) pairs by reconstructing both B mesons in semileptonic decays to D*(-/+)l(+/-). We measure R(D*) = 0.302 +/- 0.030(stat) +/- 0.011(syst), which is within 1.6 sigma of the Standard Model theoretical expectation, where the standard deviation sigma includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.</P>
Evidence for semileptonicB−→pp¯ℓ−ν¯ℓdecays
Tien, K.-J.,Wang, M.-Z.,Adachi, I.,Aihara, H.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Bala, A.,Bhuyan, B.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Chang, P.,Chekelian, V.,Chen, A.,Chen, P American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.1
S. K. Pradhan,S. N. Das,S. Bhuyan,Seshadev Sahoo,R. N. P. Choudhary 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.2
Multiferroic gadolinium (Gd) doped BiFeO 3 (BFO) and PbTiO 3 (PT) samples [(Pb 1−x Bi 0.5x Gd 0.5x )(Fe x Ti 1−x )O 3 ] with x = 0.1, 0.3, 0.5 and 0.7 are formulated by adopting the solid state reaction process. The impact of gadolinium substitution in the crystal structure, morphological behavior and electrical properties has been studied. By altering the Gd concentration in the solid solution a change in the structure is observed that is from tetragonal to rhombohedral. The size of the grain in the compounds reduces as a result of enrich in gadolinium content of the furnished sample. The subsidence of lead minimizes the toxic behavior of the material with significant improvements in dielectric response of gadolinium modifi ed BiFeO3 – PbTiO 3synthesized system. From the impedance study, the material presents negative temperature coefficient of resistance characteristics and the impedance is due to the presence of grain and grain boundary eff ect inside the materials. It is realized that the remnant polarization decreases and frequency dependent ac conductivity increases with the concentration of gadolinium in the electronic system. From conductivity study, the equipped electronic materials show non-exponential type of conductivity relaxation.
Electronic, Magnetic and Optical Properties of 2D Metal Nanolayers: A DFT Study
Prabal Dev Bhuyan,Sanjeev K. Gupta,Deobrat Singh,Yogesh Sonvane,P. N. Gajjar 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
In the recent work, we have investigated the structural, electronic, magnetic and optical properties of graphene-like hexagonalmonolayers and multilayers (up to fi ve layers) of 3 d -transition metals Fe, Co and Ni based on spin-polarized density functionaltheory. Here, we have taken two types of pattern namely AA-stacking and AB-stacking for the calculations. The bindingenergy calculations show that the AA-type confi guration is energetically more stable. The calculated binding energies of Fe,Co and Ni-bilayer monolayer are − 3.24, − 2.53 and − 1.94 eV, respectively. The electronic band structures show metallicbehavior for all the systems and each confi gurations of Fe, Co and Ni-atoms. While, the quantum ballistic conductancesof these metallic systems are found to be higher for pentalayer than other layered systems. The density of states confi rmsthe ferromagnetic behavior of monolayers and multilayers of Fe and Co having negative spin polarizations. We have alsocalculated frequency dependent complex dielectric function, electronic energy loss spectrum and refl ectance spectrum ofmonolayer to pentalayer metallic systems. The ferromagnetic material shows Different permittivity tensor ( ɛ ), which is dueto high spin magnetic moment for n-layered Fe and Co two-dimensional (2D) nanolayers. The theoretical investigation suggeststhat the electronic, magnetic and optical properties of 3 d -transition metal nanolayers off ers great promise for their usein spintronics nanodevices and magneto-optical nanodevices applications.