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First observation ofγγ→pp¯K+K−and search for exotic baryons inpKsystems
Shen, C. P.,Yuan, C. Z.,Adachi, I.,Aihara, H.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bobrov, A.,B American Physical Society 2016 Physical review. D Vol.93 No.11
<P>The process gamma gamma -> p (p) over barK(+)K(-) and its intermediate processes are measured for the first time using a 980 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The production of p (p) over barK(+)K(-) and a Lambda(1520)(0) ((Lambda) over bar (1520)(0)) signal in the pK(-) ((p) over barK(+)) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV/c(2), denoted as Theta(1540)(0) ((Theta) over bar (1540)(0)) or Theta(1540)(++) (Theta(1540)(--)), is seen in the pK(-) ((p) over barK(+)) or pK(+) ((p) over barK(-)) invariant mass spectra. Cross sections for gamma gamma -> p (p) over barK(+)K(-), Lambda(1520)(0)(p) over barK(+) + c.c. and the products sigma(gamma gamma -> Theta(1540)(0)(p) over barK(+) + c.c.)B(Theta(1540)(0) -> pK(-)) and sigma(gamma gamma -> Theta(1540)(++)(p) over barK(-) + c.c.)B(Theta(1540)(++) -> pK(+)) are measured. We also determine upper limits on the products of the chi(c0) and chi(c2) two-photon decay widths and their branching fractions to p (p) over barK(+)K(-) at the 90% credibility level.</P>
Babu, P.,Jang, K.H.,Kim, E.S.,Vijaya, R.,Jayasankar, C.K.,Lavin, V.,Seo, H.J. North-Holland 2011 Journal of non-crystalline solids Vol.357 No.10
A fluorometaphosphate laser glass doped with Eu<SUP>3+</SUP> ions has been synthesized and studied by broad band optical spectroscopy and time-resolved fluorescence line narrowing techniques in order to explore the local field dependent fluorescence properties of the lanthanide ions in this host. From the Raman and the vibronic spectra, various structural phosphate groups coupled to the Eu<SUP>3+</SUP> ions have been identified. Local field dependent <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>J</SUB> (J=0-6) emission spectra and the lifetimes of the <SUP>5</SUP>D<SUB>0</SUB> level have been measured under resonant excitation of the Eu<SUP>3+</SUP> ions at different wavelengths within the <SUP>7</SUP>F<SUB>0</SUB>→<SUP>5</SUP>D<SUB>0</SUB> band at 16K. From these data and using the Stark level positions of the <SUP>7</SUP>F<SUB>1</SUB> and <SUP>7</SUP>F<SUB>2</SUB> multiplets, a crystal-field analysis has been carried out assuming a C<SUB>2v</SUB> orthorhombic local symmetry. The radiative Judd-Ofelt parameters have been calculated for the different local fields found in the glass and their relative variation has been discussed. The results obtained suggest the existence of a relatively narrow distribution of local fields generated by successive distortions of a unique kind of site for all the Eu<SUP>3+</SUP> ions in this fluorometaphosphate glass.
Search for the 0−− glueball in ϒ(1S) and ϒ(2S) decays
Jia, S.,Shen, C. P.,Yuan, C. Z.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Barberio, E.,Behera, P.,Bhuyan, B.,Biswal, J.,Bonvicin American Physical Society 2017 Physical Review D Vol.95 No.1
<P>We report the first search for the J(PC) = 0(--) glueball in Upsilon(1S) and Upsilon(2S) decays with data samples of (102 +/- 2) x 10(6) and (158 +/- 4) x 10(6) events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in Upsilon(1S) and Upsilon(2S) decays are obtained. The inclusive branching fractions of the Upsilon(1S) and Upsilon(2S) decays into final states with chi(c1) are measured to be B(Upsilon(1S) -> chi(c1) + anything) = (1.90 +/- 0.43(stat) +/- 0.14(syst) x 10(-4) with an improved precision over prior measurements and B Upsilon(2S) -> chi(c1) + anything) = (2.24 +/- 0.44(stat) +/- 0.20(syst) x 10(-4) for the first time.</P>
Search for light tetraquark states in ϒ(1S) and ϒ(2S) decays
Jia, S.,Shen, C. P.,Yuan, C. Z.,Adachi, I.,Ahn, J. K.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Behera, P.,Berge American Physical Society 2017 Physical review. D Vol.96 No.11
<P>We search for the J(PC) = 0(--) and 1(+-) light tetraquark states with masses up to 2.46 GeV/c(2) in gamma(1S) and gamma(2S) decays with data samples of (102 +/- 2) million and (158 +/- 4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C. L.) upper limits on their branching fractions in Upsilon(1S) and Upsilon(2S) decays are obtained. The inclusive branching fractions of the Upsilon(1S) and Upsilon(2S) decays into final states with f(1)(1285) are measured to be B(Upsilon(1S) -> f(1)(1285) + anything) = (46 +/- 28(stat) +/- 13(syst)) x 10(-4) and B(Upsilon(2S) -> f(1)(1285) + anything) = (22 +/- 15(stat) +/- 6.3(syst)) x 10(-4). The measured chi(b2) -> J/Psi + anything branching fraction is measured to be (1.50 +/- 0.34(stat) +/- 0.22(syst)) x 10(-3), and 90% C. L. upper limits for the chi(b0;b1) -> J/Psi + anything branching fractions are found to be 2.3 x 10(-3) and 1.1 x 10(-3), respectively. For B(chi(b1) -> omega + anything), the branching fraction is measured to be (4.9 +/- 1.3(stat) +/- 0.6(syst) x 10(-2). All results reported here are the first measurements for these modes.</P>
Capillary electrophoresis at the omics level: Towards systems biology
Babu C. V., Suresh,Song, Eun Joo,Babar, Sheikh Md. Enayetul,Wi, Mun Hyung,Yoo, Young Sook WILEY-VCH Verlag 2006 Electrophoresis Vol.27 No.1
<P>Emerging systems biology aims at integrating the enormous amount of existing omics data in order to better understand their functional relationships at a whole systems level. These huge datasets can be obtained through advances in high-throughput, sensitive, precise, and accurate analytical instrumentation and technological innovation. Separation sciences play an important role in revealing biological processes at various omic levels. From the perspective of systems biology, CE is a strong candidate for high-throughput, sensitive data generation which is capable of tackling the challenges in acquiring qualitative and quantitative knowledge through a system-level study. This review focuses on the applicability of CE to systems-based analytical data at the genomic, transcriptomic, proteomic, and metabolomic levels.</P>
Babu, C.V. Suresh,Chung, Bong Chul,Lho, Dong Seok,Yoo, Young Sook Elsevier 2006 Journal of chromatography Vol.1111 No.2
<P><B>Abstract</B></P><P>Immunoassays are commonly used in bioresearch for the detection and quantification of small proteins and macromolecules in biological fluids and other complex matrices. In this report, a competitive immunoassay using capillary electrophoresis (CE) with laser-induced fluorescence was developed for methionine-enkephalin (ME). The method is based on the competitive reaction between the ME and fluorescein conjugated ME (ME-F) with anti-ME antibody, capillary electrophoresis separation of the ME-antibody bound and free ME-F, followed by the laser-induced fluorescence detection of the fluorescent species. With the optimized separation conditions, it was possible to separate the antibody bound and free fluorescien conjugated ME by a capillary electrophoresis–laser-induced fluorescence (CE–LIF) analysis using an uncoated fused-silica capillaries. The results concluded that the assay specificity, selectivity and accuracy were excellent.</P>
Search for X(3872) and X(3915) decay into χc1π0 in B decays at Belle
Bhardwaj, V.,Jia, S.,Adachi, I.,Aihara, H.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bansal, V.,Behera, P.,Beleñ,o, C.,Berger, M.,Bhuyan, B.,Bilka, T.,Biswal, J.,Bobr American Physical Society 2019 Physical review. D Vol.99 No.11
Suresh Babu, C. V.,Cho, Sung Gook,Sook Yoo, Young WILEY-VCH Verlag 2005 Electrophoresis Vol.26 No.19
<P>Signal transduction studies have indicated that Akt is essential for transducing the signals originating from extracellular stimuli. An exploration of the Akt signal transduction mechanism depends on the ability to assay its activation states by determining the ability of Akt to phosphorylate various substrates. This paper describes a CE-based kinase assay for Akt using a UV detection method. The RPRAATF peptide was used as the specific substrate to determine the Akt activity. Under the CE separation conditions used, the phosphorylated and nonphosphorylated forms of the RPRAATF peptide were rapidly resolved in the Akt reaction mixture within 20 min. Using this method for measuring the Akt activity, the incubation time for the Akt reactions as well as the kinetic parameters (K<SUB>M</SUB>) were examined. Furthermore, the developed method was applied to a PC12 cell system to assess the dynamics of the Akt activity by examining the effectiveness of the RPRAATF peptide substrate under various cytokine-stimulated environments. These results highlight the feasibility of the CE method, which is a simple and reliable technique for determining and characterizing various enzyme reactions particularly kinase enzymes.</P>