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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>
Search for the lepton-flavor-violating decay B0→K*0μ±e∓
Sandilya, S.,Trabelsi, K.,Schwartz, A. J.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Beh American Physical Society 2018 Physical review. D Vol.98 No.7
Observation of <sup>B+</sup>→<sup>K+</sup>ηγ
Nishida, S.,Abe, K.,Aihara, H.,Akatsu, M.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,k Elsevier 2005 Physics letters: B Vol.610 No.1
<P><B>Abstract</B></P><P>We report measurements of radiative <I>B</I> decays with Kηγ final states, using a data sample of 253 <SUP>fb−1</SUP> recorded at the ϒ(4S) resonance with the Belle detector at the KEKB <SUP>e+</SUP><SUP>e−</SUP> storage ring. We observe <SUP>B+</SUP>→<SUP>K+</SUP>ηγ for the first time with a branching fraction of (8.4±1.5(stat)−0.9+1.2(syst))×<SUP>10−6</SUP> for <SUB>MKη</SUB><2.4 GeV/<SUP>c2</SUP>, and find evidence of <SUP>B0</SUP>→<SUP>K0</SUP>ηγ. We also search for B→K3∗(1780)γ.</P>
Search for Ω(2012)→KΞ(1530)→KπΞ at Belle
Jia, S.,Shen, C. P.,Adachi, I.,Ahn, J. K.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Bahinipati, S.,Bakich, A. M.,Behera, P.,Beleñ,o, C.,Bennett, J.,Berger, M.,Bhardwaj, V. American Physical Society 2019 Physical review. D Vol.100 No.3
Observation of the decayB0→η′K*(892)0
Sato, S.,Yusa, Y.,Mohanty, G. B.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Bhardwaj, V.,Bhuyan, B.,Bonvicini, G.,Bozek, American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
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>
Nakazawa, H.,Uehara, S.,Abe, K.,Abe, K.,Aihara, H.,Akatsu, M.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,B Elsevier 2005 Physics letters: B Vol.615 No.1
<P><B>Abstract</B></P><P>We have measured <SUP>π+</SUP><SUP>π−</SUP> and <SUP>K+</SUP><SUP>K−</SUP> production in two-photon collisions using 87.7<SUP>fb−1</SUP> of data collected with the Belle detector at the asymmetric energy <SUP>e+</SUP><SUP>e−</SUP> collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (<I>W</I>) range between 2.4GeV<W<4.1GeV and angular region |cos<SUP>θ∗</SUP>|<0.6. The cross section ratio σ(γγ→<SUP>K+</SUP><SUP>K−</SUP>)/σ(γγ→<SUP>π+</SUP><SUP>π−</SUP>) is measured to be 0.89±0.04(stat.)±0.15(syst.) in the range of 3.0GeV<W<4.1GeV, where the ratio is energy-independent. We observe a <SUP>sin−4</SUP><SUP>θ∗</SUP> behavior of the cross section in the same <I>W</I> range. Production of <SUB>χc0</SUB> and <SUB>χc2</SUB> mesons is observed in both γγ→<SUP>π+</SUP><SUP>π−</SUP> and γγ→<SUP>K+</SUP><SUP>K−</SUP> modes.</P>
First observation of the decayB0→ψ(2S)π0
Chobanova, V.,Dalseno, J.,Kiesling, C.,Abdesselam, A.,Adachi, I.,Aihara, H.,Asner, D. M.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Barberio, E.,Behera, P.,Bhardwaj, V.,Bhu American Physical Society 2016 Physical Review D Vol.93 No.3
<P>We report a measurement of the B-0 -> psi(2S)pi(0) branching fraction based on the full Upsilon(4S) data set of 772 x 10(6) B (B) over bar pairs collected by the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain B(B-0 -> psi(2S)pi(0)) = (1.17 +/- 0.17(stat) +/- 0.08(syst)) x 10(-5). The result has a significance of 7.2 standard deviations and is the first observation of the decay B-0 -> psi(2S)pi(0).</P>
Study ofD**production and light hadronic states in theB¯0→D*+ωπ−decay
Matvienko, D.,Kuzmin, A.,Eidelman, S.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Arinstein, K.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,B American Physical Society 2015 PHYSICAL REVIEW D - Vol.92 No.1
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>