We report the first search for the \(J^{PC}=0^{--}\) glueball in \(\Upsilon(1S)\) and \(\Upsilon(2S)\) decays with data samples of \((102\pm2)\) million and \((158\pm4)\) million 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 a \(\chi_{c1}\) are measured to be \(\BR(\Upsilon(1S)\to \chi_{c1}+ anything) = (1.90\pm 0.43(stat.)\pm 0.14(syst.))\times 10^{-4}\) with an improved precision over prior measurements and \(\BR(\Upsilon(2S)\to \chi_{c1}+ anything) = (2.24\pm 0.44(stat.)\pm 0.20(syst.))\times 10^{-4}\) for the first time.
Evidence for the decay B0→K+K-π0 Gaur, V.; Mohanty, G. B.; Aziz, T. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
05/2013, Volume:
87, Issue:
9
Journal Article
Open access
We report a search for charmless hadronic decays of neutral B mesons to the final state K+K- π00. The results are based on a 711 fb-1 data sample that contains 772x106 $B$$\bar{B}$ pairs, and was ...collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find the first evidence for this decay with a significance of 3.5 standard deviations and measure its branching fraction as $\mathscr{B}$(B0 --> K+K-π0) = 2.17 ± 0.60(stat) ± 0.24 (syst)x10-6.
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493.
Evidence for the decay B 0 → K + K − π 0 Gaur, V.; Mohanty, G. B.; Aziz, T. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
05/2013, Volume:
87, Issue:
9
Journal Article
Full text
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We report a search for $B$ decays to selected final states with the $\eta_c$ meson: $B^{\pm}\to K^{\pm}\eta_c\pi^+\pi^-$, $B^{\pm}\to K^{\pm}\eta_c\omega$, $B^{\pm}\to K^{\pm}\eta_c\eta$ and ...$B^{\pm}\to K^{\pm}\eta_c\pi^0$. The analysis is based on $772\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We set 90\% confidence level upper limits on the branching fractions of the studied $B$ decay modes, independent of intermediate resonances, in the range $(0.6-5.3)\times 10^{-4}$. We also search for molecular-state candidates in the $D^0\bar{D}^{*0}-\bar{D}^0D^{*0}$, $D^0\bar{D}^0+\bar{D}^0D^0$ and $D^{*0}\bar{D}^{*0}+\bar{D}^{*0}D^{*0}$ combinations, neutral partners of the $Z(3900)^{\pm}$ and $Z(4020)^{\pm}$, and a poorly understood state $X(3915)$ as possible intermediate states in the decay chain, and set 90\% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range $(0.6-6.9)\times 10^{-5}$.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
495.
Evidence for the decay B0→K+K-π0 Gaur, V.; Mohanty, G. B.; Aziz, T. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
05/2013, Volume:
87, Issue:
9
Journal Article
Evidence for the decay B0 --> K+K-pi0 journal article
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We report a measurement of the ratio \({\cal R}(D^*) = {\cal B}(\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B}^0 \rightarrow D^{*+} \ell^- \bar{\nu}_{\ell})\), where \(\ell\) ...denotes an electron or a muon. The results are based on a data sample containing \(772\times10^6\) \(B\bar{B}\) pairs recorded at the \(\Upsilon(4S)\) resonance with the Belle detector at the KEKB \(e^+ e^-\) collider. We select a sample of \(B^0 \bar{B}^0\) pairs by reconstructing both \(B\) mesons in semileptonic decays to \(D^{*\mp} \ell^{\pm}\). We measure \({\cal R}(D^*)= 0.302 \pm 0.030({\rm stat)} \pm 0.011({\rm syst)}\), 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.
We report the first observation of the decays \(B^0 \rightarrow p\bar{\Lambda} D^{(*)-}\). The data sample of \(711\) fb\(^{-1}\) used in this analysis corresponds to \(772\) million \(B\bar{B}\) ...pairs, collected at the \(\Upsilon(4S)\) resonance by the Belle detector at the KEKB asymmetric-energy \(e^{+}e^{-}\) collider. We observe \(19.8\sigma\) and \(10.8\sigma\) excesses of events for the two decay modes and measure the branching fractions of \(B^0 \rightarrow p\bar{\Lambda} D^{-}\) and \(B^0 \rightarrow p\bar{\Lambda} D^{*-}\) to be \((25.1\pm2.6\pm3.5)\times10^{-6}\) and \((33.6\pm6.3\pm4.4)\times10^{-6}\), respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the di-baryon (\(p\bar{\Lambda}\)) system is observed, consistent with that observed in similar \(B\) decays.
We report a search for a dark vector gauge boson \(U^\prime\) that couples to quarks in the decay chain \(D^{*+} \to D^0 \pi^+, D^0 \to K^0_S \eta, \eta \to U^\prime \gamma\), \(U^\prime \to \pi^+ ...\pi^-\). No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of \(10^{-3} - 10^{-2}\) in the \(U^\prime\) mass range of 290 to 520 MeV/\(c^2\). This analysis is based on a data sample of 976 fb\(^{-1}\) collected by the Belle experiment at the KEKB asymmetric-energy \(e^+e^-\) collider.
The branching fractions of the \(\Upsilon(1S)\) inclusive decays into final states with a \(J/\psi\) or a \(\psi(2S)\) are measured with improved precision to be \(\BR(\Upsilon(1S)\to J/\psi + {\rm ...anything})=(5.25\pm 0.13(\mathrm{stat.})\pm 0.25(\mathrm{syst.}))\times 10^{-4}\) and \(\BR(\Upsilon(1S)\to \psi(2S) + {\rm anything})=(1.23\pm 0.17(\mathrm{stat.})\pm 0.11(\mathrm{syst.}))\times 10^{-4}\). The first search for \(\Upsilon(1S)\) decays into \(XYZ\) states that decay into a \(J/\psi\) or a \(\psi(2S)\) plus one or two charged tracks yields no significant signals for \(XYZ\) states in any of the examined decay modes, and upper limits on their production rates in \(\Upsilon(1S)\) inclusive decays are determined.
We report a search for B0 decays into invisible final states using a data sample of 657×106 B$\bar{B}$B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e- collider. The ...signal is identified by fully reconstructing a hadronic decay of the accompanying B meson and requiring no other particles in the event. No significant signal is observed, and we obtain an upper limit of 1.3×10-4 at the 90% confidence level for the branching fraction of invisible B0 decay.
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