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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>
Hulthén Half-off-Shell T Matrix-Application to n-p and n-d Systems
A. K. Behera,U. Laha,P. Sahoo,J. Bhoi 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.9
In a previous paper, one of us (UL) constructed an exact analytical expression for the irregular (Jost) solution, off the energy shell, for the Hulthén potential by using the method of ordinary differential equation along with the properties of certain special functions of mathematical physics. In the present text, closed form expressions for the off-shell irregular solution and half-off-shell T-matrix for motion in the Hulthén potential are re-derived by using the direct integration approach to the problem under consideration. We demonstrate the usefulness of our expressions through some model calculations and achieve excellent agreement between bound-and scattering-state observables and standard results.
Dielectric and Frequency Dependent Transport Properties of Gadolinium Doped Bismuth Ferrite
A. K. Sahu,S. K. Satpathy,S.K. Rout,Banarji Behera 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.2
Ceramics of (Bi 1−x Gd x FeO 3 ) [x = 0.5, 0.6 and 0.7] were synthesized through mixed oxide method. Structural studies of the ceramics were done using X-ray diff raction technique. At high frequency, nearly flat response in the dielectric constant and dielectric loss with temperature up to 200 °C were observed. Dielectric constant found to increase with decrease in Gadolinium concentration. Frequency dependent electrical data analysis at diff erent temperatures suggested a temperature dependent non-Debye type relaxation process in the ceramics. Frequency dependence AC conductivity at different temperatures obeyed Jonscher’s universal power law. The temperature dependence of DC and AC conductivity was fitted with Arrhenius equation. The activation energies at different temperature ranges were calculated to understand the conduction process.
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>
The Belle II silicon vertex detector assembly and mechanics
Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, T.,Bettarini, Elsevier BV * North-Holland 2017 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>The Belle II experiment at the asymmetric SuperKEKB collider in Japan will operate at an instantaneous luminosity approximately 50 times greater than its predecessor (Belle). The central feature of the experiment is a 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 CP violation asymmetry in the decays of beauty and charm hadrons, which hinges on a precise charged-track vertex determination and low-momentum track measurement. 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 3D coordinate measurements of the final SVD modules.</P> <P>Finally, some results from the latest test-beam are reported.</P>
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>
Lahel, A.,Fanta, A.B.,Sergienko, N.,Shakya, M.,Lopez, M.E.,Behera, S.K.,Rene, E.R.,Park, H.S. Elsevier Applied Science 2016 International biodeterioration & biodegradation Vol.113 No.-
This study focused on investigating the key parameters that influences carbon dioxide (CO<SUB>2</SUB>) production during the bioremediation of diesel contaminated soil. The effects of diesel concentration, moisture content and biomass dose were investigated in batch experiments, for 20 days, to ascertain the CO<SUB>2</SUB> production and the amount of diesel mineralized. A regression model based on full factorial design of experiments was developed to predict the CO<SUB>2</SUB> production. Based on the F and p values from Analysis of Variance (ANOVA) results, the main effects of process parameters affected diesel bioremediation strongly than the 2-way and 3-way interaction effects. The highest total petroleum hydrocarbon (TPH) mineralized and the maximum CO<SUB>2</SUB> productions were ~3000 mg/kg-soil and ~10,000 mg/kg-soil, respectively, at a diesel concentration of 10,000 mg/kg-soil, 20% moisture content and a biomass dose of 275 mg/kg-soil.
Priyambada Mallick,A. K. Sahu,Susanta Ku. Biswal,S. K. Satpathy,Banarji Behera 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.5
Synthesis of polycrystalline samples of Bi 1–x R x FeO 3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 and 0.8 were demonstrated through solid-state reaction method at high temperature. The X-ray diffraction technique confirmed the orthorhombic phase of the samples and structural parameters like microstrain, crystallinity percentage, and dislocation density of the composites were calculated using an approximation method from XRD data. A negative temperature coefficient of resistance (NTCR) behavior of all the samples at various temperatures was confi rmed from the variation of resistance with temperature. The inverse dependence of dielectric constant with a doping concentration of rare earth metal was identified. Bismuth ferrite with dopants Nd, La, and Gd was found to have the potential to be used as an NTC Thermistor by enhancing the value of thermistor constant (β), sensitivity factor (α), and stability factor.