arXiv subjects

the Belle Collaboration

Publications and source records attributed to the Belle Collaboration.

5 recordsLinked to original sources

arXiv2013

Search for an H-dibaryon with mass near 2m_Lambda in Y(1S) and Y(2S) decays

We report the results of a high-statistics search for H-dibaryon production in inclusive Y(1S) and Y(2S) decays. No indication of an H-dibaryon with mass near the M_H=2m_Lambda threshold is seen in either the H-> Lambda p pi- or Lambda-Lambda decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive Y(1S) and Y(2S) decays to antideuterons. Since Y(1,2S) decays produce flavor-SU(3)-symmetric final states, these results put stringent constraints on H-dibaryon properties. The results are based on analyses of 102 million Y(1S) and 158 million Y(2S) events collected with the Belle detector at the KEKB electron-positron collider.

hep-ex↗

arXiv2011

Observation of two charged bottomonium-like resonances in Y(5S) decays

We report the observation of two narrow structures in the mass spectra of the pi+-Y(nS) (n=1,2,3) and pi+-hb(mP)(m$ (m=1,2) pairs that are produced in association with a single charged pion in Y(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M_1=(10607.2+-2.0) MeV/c2, Gamma_1=(18.4+-2.4) MeV and M_2=(10652.2+-1.5) MeV/c2, Gamma_2=(11.5+-2.2) MeV. The results are obtained with a 121.4 1/fb data sample collected with the Belle detector in the vicinity of the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider.

hep-ex↗

arXiv2011

Search for B_{s}^{0}->hh Decays at the $Υ(5S)$ Resonance

We have searched for B_{s}^{0}->hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are based on a 23.6 fb^{-1} data sample collected with the Belle detector on the Υ(5S) resonance at the KEKB asymmetric-energy e^{+}e^{-} collider, containing 1.25x10^6 B_{s}^{(*)}\bar{B}_{s}^{(*)} events. We observe the decay B_{s}^{0}->K^{+}K^{-} and measure its branching fraction, \mathcal{B}(B_{s}^{0}->K^{+}K^{-}) = [3.8_{-0.9}^{+1.0}(\mathrm{stat})\pm 0.5(\mathrm{syst})\pm 0.5(f_s)] \times 10^{-5}. The first error is statistical, the second is systematic, and the third error is due to the uncertainty in the B^0_s production fraction in $e^+e^-\to b\bar{b}$ events. No significant signals are seen in other decay modes, and we set upper limits at 90% confidence level: \mathcal{B}(B_{s}^{0}->K^-π^{+})< 2.6 \times 10^{-5}, \mathcal{B}(B_{s}^{0}->π^{+}π^{-})< 1.2 \times 10^{-5} and \mathcal{B}(B_{s}^{0}->K^0\bar{K}^0) < 6.6\times 10^{-5}.

hep-ex↗

arXiv2011

Measurement of eta eta production in two-photon collisions

We report the first measurement of the differential cross section for the process gamma gamma --> eta eta in the kinematic range above the eta eta threshold, 1.096 GeV < W < 3.8 GeV over nearly the entire solid angle range, |cos theta*| <= 0.9 or <= 1.0 depending on W, where W and theta* are the energy and eta scattering angle, respectively, in the gamma gamma center-of-mass system. The results are based on a 393 fb^{-1} data sample collected with the Belle detector at the KEKB e^+ e^- collider. In the W range 1.1-2.0 GeV/c^2 we perform an analysis of resonance amplitudes for various partial waves, and at higher energy we compare the energy and the angular dependences of the cross section with predictions of theoretical models and extract contributions of the chi_{cJ} charmonia.

hep-ex↗

arXiv2003

Study of time-dependent CP-violation in $B^0 \to J/ψ~π^0$ decay

We report a measurement of CP asymmetry parameters in the $b \to c\bar{c}d$-transition-induced decays $B^0(\bar{B^0}) \to J/ψpi^0$. The analysis is based on a 140 fb$^{-1}$ data sample accumulated at the $Υ(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We fully reconstruct one neutral $B$ meson in the $J/ψ~π^0$ final state. The accompanying $B$ meson flavor is identified by its decay products. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters: S(J/ψπ^0)= -0.72 \pm0.42 (stat) \pm 0.08(syst) A(J/ψπ^0)= -0.01 \pm0.29 (stat) \pm 0.07(syst).

hep-ex↗