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Search for CP Violation and Measurement of the Branching Fraction in the Decay D0→KS0KS0
Dash, N.,Bahinipati, S.,Bhardwaj, V.,Trabelsi, K.,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.,Bhuyan, B American Physical Society 2017 Physical review letters Vol.119 No.17
<P>We report a study of the decay D-0 -> (KSKS0)-K-0 using 921 fb(-1) of data collected at or near the (sic)(4S) and (sic)(5S) resonances with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. The measured time-integrated CP asymmetry is A(CP)(D-0 -> (KSKS0)-K-0) = (-0.02 +/- 1.53 +/- 0.02 +/- 0.17)%, and the branching fraction is B(D-0 -> (KSKS0)-K-0) = (1.321 +/- 0.023 +/- 0.036 +/- 0.044) x 10(-4), where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D-0 -> K-S(0)pi(0)). These results are significantly more precise than previous measurements available for this mode. The A(CP) measurement is consistent with the standard model expectation.</P>
Absent portal vein bifurcation: a rare variant and its clinical significance
Ranjan Kumar Sahoo,Sitansu Kumar Panda,Pravakar Bahinipati 대한해부학회 2014 Anatomy & Cell Biology Vol.47 No.3
Portal vein branching anomaly occurs due to aberration of normal anastomotic patterns and involution of vitelline veins during development of portal vein. Anatomical knowledge of portal vein and its branching pattern is important for hepatobiliary surgeon and gastrointestinal intervention radiologist. We are reporting a case of absence of portal vein bifurcation showing single main intrahepatic portal vein with gradual decreasing caliber distally, in a young female patient on contrast-enhanced computed tomography study of abdomen. Few cases of absence of portal bifurcation have been reported in literature so far.
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>
Search for τ→eγ decay at Belle
Hayasaka, K.,Abe, K.,Abe, K.,Aihara, H.,Asano, Y.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,ko, M.,Brodzicka, J.,Browder, T.E.,Cha Elsevier 2005 Physics letters: B Vol.613 No.1
<P><B>Abstract</B></P><P>We have searched for the lepton-flavor-violating decay τ→eγ using a data sample of 86.7 fb<SUP>−1</SUP> collected with the Belle detector at the KEKB asymmetric <SUP>e+</SUP><SUP>e−</SUP> collider. No evidence for a signal is obtained, and we set an upper limit for the branching fraction B(τ→eγ)<3.9×<SUP>10−7</SUP> at the 90% C.L.</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>
The Belle II silicon vertex detector: Assembly and initial results
Thalmeier, R.,Casarosa, G.,Schwanda, C.,Aihara, H.,Aziz, T.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bertacchi, V.,Betta Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.936 No.-
<P><B>Abstract</B></P> <P>The “chip-on-sensor” concept of this detector minimizes the distance of the signal propagation from the double-sided silicon detector strips to the readout chips and thus reduces noise from strip capacitance. One half of the detector is built, the second half is being assembled at the time of writing. Prototypes have been tested in several test beams as well as in the so-called Phase 2 setup inside the detector structure. First results from a commissioning run of the Belle-II prototype SVD detector are presented. The measured signal-to-noise and timing performance are found to be according to design specifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Belle-II Silicon Vertex Detector is based on a “chip-on-sensor” concept. </LI> <LI> One half of the detector is built, the second half is being assembled. </LI> <LI> Prototypes have been tested in a commissioning run inside the detector structure. </LI> <LI> The measured SNR and hit time are found to be according to design specifications. </LI> </UL> </P>
Measurement of masses and branching ratios of Ξc+ and Ξc0 baryons
Lesiak, T.,Abe, K.,Abe, K.,Adachi, I.,Aihara, H.,Asano, Y.,Bahinipati, S.,Bakich, A.M.,Bay, A.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Brač,ko, M.,Brodzicka, J.,Browder, T.E.,Chao, Y.,Chen, A. Elsevier 2005 Physics letters: B Vol.605 No.3
<P><B>Abstract</B></P><P>We report a measurement of the Ξc+ and Ξc0 baryon masses, and the branching ratios for various <SUB>Ξc</SUB> decays, using 140 <SUP>fb−1</SUP> of data collected by the Belle experiment at the KEKB <SUP>e+</SUP><SUP>e−</SUP> collider. The mass splitting <SUB>mΞc0</SUB>−<SUB>mΞc+</SUB> is found to be 2.9±0.5 MeV/<SUP>c2</SUP>; this measurement is three times as precise as the current world average. We measure the branching ratios Γ(Ξc+→Λ<SUP>K−</SUP><SUP>π+</SUP><SUP>π+</SUP>)/Γ(Ξc+→<SUP>Ξ−</SUP><SUP>π+</SUP><SUP>π+</SUP>)=0.32±0.03±0.02 and Γ(Ξc0→p<SUP>K−</SUP><SUP>K−</SUP><SUP>π+</SUP>)/Γ(Ξc0→<SUP>Ξ−</SUP><SUP>π+</SUP>)=0.33±0.03±0.03, with improved precision, and measure Γ(Ξc+→pKS0KS0)/Γ(Ξc+→<SUP>Ξ−</SUP><SUP>π+</SUP><SUP>π+</SUP>)=0.087±0.016±0.014, Γ(Ξc0→Λ<SUP>K−</SUP><SUP>π+</SUP>)/Γ(Ξc0→<SUP>Ξ−</SUP><SUP>π+</SUP>)=1.07±0.12±0.07 and Γ(Ξc0→ΛKS0)/Γ(Ξc0→<SUP>Ξ−</SUP><SUP>π+</SUP>)=0.21±0.02±0.02 for the first time.</P>
Improved measurement of the electroweak penguin processB→Xsℓ+ℓ−
Iwasaki, M.,Itoh, K.,Aihara, H.,Abe, K.,Abe, K.,Adachi, I.,Asano, Y.,Aushev, T.,Bahinipati, S.,Bakich, A. M.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,ko, M American Physical Society 2005 PHYSICAL REVIEW D - Vol.72 No.9
Vorobyev, V.,Adachi, I.,Aihara, H.,Asner, D. M.,Aushev, T.,Ayad, R.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bobrov, A.,Bondar, A.,Bozek, A.,Brač,ko American Physical Society 2016 Physical review. D Vol.94 No.5
<P>We report a measurement of the CP-violation parameter phi(1) obtained in a time-dependent analysis of B-0 -> (D) over bar(*)(0)h(0) decays followed by (D) over bar (0) -> K-S(0)pi(+)pi decay. A model-independent measurement is performed using the binned Dalitz plot technique. The measured value is phi(1) = 11.7 degrees +/- 7.8 degrees(stat) +/- 2.1 degrees (syst). Treating sin 2 phi(1) and cos 2 phi(1) as independent parameters, we obtain sin 2 phi(1) = 0.43 +/- 0.27(stat) +/- 0.08(syst) and cos 2 phi(1) = 1.06 +/- 0.33(stat)(-0.15)(+0.21)(syst). The results are obtained with a full data sample of 772 x 10(6)B (B) over bar pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.</P>