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Measurements of the absolute branching fractions of B+→Xcc¯K+ and B+→D¯(*)0π+ at Belle
Kato, Y.,Iijima, T.,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.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Bisw American Physical Society 2018 Physical Review D Vol.97 No.1
<P>We present the measurement of the absolute branching fractions of B+ -> Xc (c) over barK+ and B+ -> (D) over bar ((*)0)pi(+) decays, using a data sample of 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. Here, X-c (c) over bar denotes eta(c), J/psi, chi(c0), chi(c1), eta(c) (2S), psi(2S), psi(3770), X(3872), and X(3915). We do not observe significant signals for X(3872) or X(3915) and set the 90% confidence level upper limits at B(B+ -> X(3872)K+) < 2.6 x 10(-4) and B(B+ -> X(3915)K+) < 2.8 x 10(-4). These represent the most stringent upper limit for B(B+ -> X(3872)K+) to date and the first limit for B(B+ -> X(3915)K+). The measured branching fractions for eta(c) and eta(c)(2S) are the most precise to date, B(B+ -> eta K-c(+)) = (12.0 +/- 0.8 +/- 0.7) x 10(-4) and B(B+ -> eta(c)(2S)K+) = (4.8 +/- 1.1 +/- 0.3) x 10(-4), where the first and second uncertainties are statistical and systematic, respectively.</P>
Search for B→hνν¯ decays with semileptonic tagging at Belle
Grygier, J.,Goldenzweig, P.,Heck, M.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Aziz, T.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Barberio, E.,Behera, P.,B American Physical Society 2017 Physical Review D Vol.96 No.9
<P>We present the results of a search for the rare decays B -> h nu(nu) over bar, where h stands for K+, K-S(0), K*(+); K*(0); pi(+); pi(0), rho(+) and rho(0). The results are obtained with 772 x 10(6) B (B) over bar pairs collected with the Belle detector at the KEKB e(+)e(-) collider. We reconstruct one B meson in a semileptonic decay and require a single h meson but nothing else on the signal side. We observe no significant signal and set upper limits on the branching fractions. The limits set on the B-0 -> K-S(0)nu(nu) over bar, B-0 -> K*(0)nu(nu) over bar, B+ -> pi(+)nu(nu) over bar, B-0 -> pi(0)nu(nu) over bar, B+ -> rho(+)nu(nu) over bar, and B-0 -> rho(0)nu(nu) over bar channels are the world's most stringent.</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>
King, Z.,Pal, B.,Schwartz, A. J.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Bakich, A. M.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bobrov, A.,Bozek, A.,Browder American Physical Society 2016 Physical Review D Vol.93 No.11
<P>We have searched for the decay B-0 -> phi gamma sing the full Belle data set of 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. No signal is observed, and we set an upper limit on the branching fraction of B(B-0 -> phi gamma) < 1.0 x 10(-7) at the 90% confidence level. This is the most stringent limit on this decay mode to date.</P>
Measurement of the branching fraction and time-dependent CP asymmetry for B0→J/ψπ0 decays
Pal, B.,Schwartz, A. J.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Badhrees, I.,Bahinipati, S.,Bansal, V.,Behera, P.,Beleñ,o, C.,Bhuyan, B.,Bilka, T.,Biswa American Physical Society 2018 Physical Review D Vol.98 No.11
Pati Dinesh Kumar,Das Piyush R.,Parida B. N.,Behera B.,Padhee R. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
The research article reports the various functional properties of barium strontium titanate [(Ba 0.8Sr0.2)TiO 3]-modifi ed lead iron niobate [Pb(Fe 0.5Nb0.5)O3] ceramic oxide synthesized by the solid-state method. Rietveld and POWD studies proved that the composition crystallizes in tetragonal structure as the primary phase. Ti–O perovskite vibrations were studied by Fourier transform infrared (FTIR) analysis. The TiO 6 octahedral stretching, O–Ti–O vibrations and Nb–O–Fe stretching vibrations of PFN were studied by Raman spectroscopy. The broadening of Raman modes was analysed in the framework of Heisenberg’s uncertainty principle using phonon confi nement model. Field emission gun-scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS) studies revealed the dense grain distributions, grain growth and purity. UV–visible analysis was done to study the narrow band gap and Urbach energy. The eff ect of structural distortions and electronegativity on band gap were analysed. The photocatalytic response was studied by estimating the band edge levels +/H 2 1 Introduction The search for room temperature multiferroic materials is one of the most vital aspects in the fi eld of material science because of its enormous applications in multi- functional devices. Lead iron niobate (PFN) belongs to the family of multiferroic electroceramics with perovskite structure having formulation ABO 3 or A(B′B″)O3, where B′ and B″ are, respectively, low and high valence cati- ons like Fe 3+ and Nb 5+. The 3d 5 electrons of Fe 3+ boosts magnetic orders and the 6s 2 electrons of Pb 2+ generate the ferroelectric orderings [ 1 ]. PFN ceramics are widely used in device applications [ 2 –4 ] such as multilayer capaci- tors, actuators, transducers and so on due to their large values of relative permittivity, diff use phase transition Vol.:(0123456789) 1 3 using Mulliken’s model. The evaluated conduction band minimum level is suffi ciently negative with respect to the H (0 eV) level, which strongly signifi es the possible occurrence of the photocatalytic hydrogen emission reaction. A detailed electrical analysis was done to study the dielectric properties, relaxation, negative temperature coeffi cient of resistance (NTCR)-type response and DC conductivity. AC conductivity studies revealed the presence of overlapping large polaron tun- nelling (OLPT) model. The eff ect of oxygen vacancies on relaxation and its correlation with activation energy were discussed. Multiferroic nature was confi rmed from room temperature studies of P–E and M–H hysteresis loops. Fe 3+ Fe 3+ (F centre) exchange and Fe 3+ Fe 2+ double exchange mechanisms were discussed. A magnetic improvement was noticed on reduction of temperature to 50 K. The simultaneous existence of weak ferroelectricity and ferromagnetism is one of the interesting outcomes of the present study, which may provide a new multiferroic material for advanced electro-optical applications.
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>
Observation of the antimatter helium-4 nucleus
Agakishiev, H.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Alford, J.,Anderson, B. D.,Anson, C. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Beavis, D. R.,Behera, N. K.,Bellwied, Nature Publishing Group, a division of Macmillan P 2011 Nature Vol.473 No.7347
High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus (), also known as the anti-慣 (), consists of two antiprotons and two antineutrons (baryon number B = ??4). It has not been observed previously, although the 慣-particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level. Antimatter nuclei with B??<????1 have been observed only as rare products of interactions at particle accelerators, where the rate of antinucleus production in high-energy collisions decreases by a factor of about 1,000 with each additional antinucleon. Here we report the observation of , the heaviest observed antinucleus to date. In total, 18 counts were detected at the STAR experiment at the Relativistic Heavy Ion Collider (RHIC; ref. 6) in 10<SUP>9</SUP> recorded gold-on-gold (Au+Au) collisions at centre-of-mass energies of 200??GeV and 62??GeV per nucleon??nucleon pair. The yield is consistent with expectations from thermodynamic and coalescent nucleosynthesis models, providing an indication of the production rate of even heavier antimatter nuclei and a benchmark for possible future observations of in cosmic radiation.
Search for B−→μ−ν¯μ Decays at the Belle Experiment
Sibidanov, A.,Varvell, K. E.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Barberio, E.,Behera, P.,Bhuyan, B.,Biswal, American Physical Society 2018 Physical Review Letters Vol.121 No.3