We measure the decay B_{s}^{0}→K^{0}Kover ¯^{0} using data collected at the ϒ(5S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. The data sample used corresponds to an integrated ...luminosity of 121.4 fb^{-1}. We measure a branching fraction B(B_{s}^{0}→K^{0}Kover ¯^{0})=19.6_{-5.1}^{+5.8}(stat)±1.0(syst)±2.0(N_{B_{s}^{0}Bover ¯_{s}^{0}})×10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
\(CP\) violation asymmetry is expected to be very small within the Standard Model. Observation of \(CP\) violation in charm sector would hint towards New Physics. Time-reversal asymmetry is sensitive ...to \(CPV\) via the \(CPT\) Theorem, and is a clean and alternative way to search for CP violation in charm decays. This is achieved by the use of triple-product correlations in 4-body charm meson decays. The results from previous searches at BaBar and LHCb Collaborations and the latest results from Belle are reported. The most recent result from Belle performed in \(D^{0} \to K^{+}K^{-}\pi^{+}\pi^{-}\) decays using kinematic asymmetry variables is the first measurement of its kind.
We have measured the branching fraction B, longitudinal polarization fraction f{sub L}, and CP asymmetry coefficients A and S for B{sup 0}{yields}{rho}{sup +}{rho}{sup -} decays with the Belle ...detector at the KEKB e{sup +}e{sup -} collider using 253 fb{sup -1} of data. We obtain B=22.8{+-}3.8(stat){sub -2.6}{sup +2.3}(syst)x10{sup -6}, f{sub L}=0.941{sub -0.040}{sup +0.034}(stat){+-}0.030(syst), A=0.00{+-}0.30(stat){+-}0.09(syst), and S=0.08{+-}0.41(stat){+-}0.09(syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase {phi}{sub 2}; the solution consistent with the standard model is {phi}{sub 2}=(88{+-}17) deg. or 59 deg. <{phi}{sub 2}<115 deg. at 90% C.L.
We report the measurement of the direct CP asymmetry in the radiative B¯→X(s+dγ) decay using a data sample of (772 ± 11)×10(6) BBover ¯ pairs collected at the ϒ(4S) resonance with the Belle detector ...at the KEKB asymmetric-energy e(+)e(-) collider. The CP asymmetry is measured as a function of the photon energy threshold. For Eγ*≥2.1 GeV, where Eγ* is the photon energy in the center-of-mass frame, we obtain A(CP)(B¯→X(s+dγ))=(2.2±3.9±0.9)%, consistent with the standard model prediction.
We report recent results on $\phi_3$ measurement at the Belle collaboration.
The analyses reported here are based on a large data sample that contains 657
million $B\bar{B}$ pairs collected with the ...Belle detector at the KEKB
asymmetric-energy $e^+ e^-$ collider at the $\Upsilon(4S)$ resonance.
We present the results of a study of the charmless vector-vector decay B0-->omegaK*0 with 657 x 10(6) BB pairs collected with the Belle detector at the KEKB e+e- collider. We measure the branching ...fraction to be B(B0-->omegaK*0) = 1.8+/-0.7(stat)+/-0.3(syst)x 10(-6) with 3.0sigma significance. We also perform a helicity analysis of the omega and K*0 vector mesons, and obtain the longitudinal polarization fraction fL(B0-->omegaK*0) = 0.56+/-0.29(stat) -0.08(+0.18)(syst). Finally, we measure a large nonresonant branching fraction BB0-->omegaK+pi(-);M Kpi in(0.755,1.250) GeV/c2 = 5.1+/-0.7(stat)+/-0.7(syst)x 10(-6) with a significance of 9.5sigma.
The e(+)e(-) → π(+)π(-)π(0)χ(bJ) (J = 0,1,2) processes are studied using a 118 fb(-1) data sample acquired with the Belle detector at a center-of-mass energy of 10.867 GeV. Unambiguous ...π(+)π(-)π(0)χ(bJ) (J = 1,2), ωχ(b1) signals are observed, and indication for ωχ(b2) is seen, both for the first time, and the corresponding cross section measurements are presented. No significant π(+)π(-)π(0)χ(b0) or ωχ(b0) signals are observed, and 90% confidence level upper limits on the cross sections for these two processes are obtained. In the π(+)π(-)π(0) invariant mass spectrum, significant non-ω signals are also observed. We search for the X(3872)-like state (named X(b)) decaying into ωϒ(1S); no significant signal is observed with a mass between 10.55 and 10.65 GeV/c(2).
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract We present a measurement of the time-dependent CP violation parameters in B ^sup 0^ arrow right eta'K ^sup 0^ ...decays. The measurement is based on the full data sample containing 772 × 10^sup 6^ ... pairs collected at the Upsilon(4S) resonance using the Belle detector at the KEKB asymmetric-energy e ^sup +^ e ^sup -^ collider. The measured values of the mixing-induced and direct CP violation parameters are: ... ... where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2 ^sub 1^ measured in B ^sup 0^ arrow right J/psiK ^sup 0^ decays. Figure not available: see fulltext.
We report the first measurement of CP-violation parameters in B0-->rho0gamma decays based on a data sample of 657x10(6)BB pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- ...collider. We obtain the time-dependent and direct CP-violating parameters, Srho0gamma=-0.83+/-0.65(stat)+/-0.18(syst) and Arho0gamma=-0.44+/-0.49(stat)+/-0.14(syst), respectively.
Using the data samples of 102 million $\Upsilon(1S)$ and 158 million
$\Upsilon(2S)$ events collected by the Belle detector, we search for a
pentaquark state in the $pJ/\psi$ final state from ...$\Upsilon(1,2S)$ inclusive
decays. Here, the charge-conjugate $\bar{p}J/\psi$ is included. We observe
clear $pJ/\psi$ production in $\Upsilon(1,2S)$ decays and measure the branching
fractions to be $\mathcal{B}\Upsilon(1S) \to pJ/\psi + anything = 4.27 \pm
0.16(stat.) \pm 0.20(syst.) \times 10^{-5}$ and $\mathcal{B}\Upsilon(2S) \to
pJ/\psi + anything = 3.59 \pm 0.14(stat.) \pm 0.16(syst.) \times 10^{-5}$.
We also measure the cross section of inclusive $pJ/\psi$ production in $e^+e^-$
annihilation to be $\sigma(e^+e^- \to pJ/\psi + anything) = 57.5 \pm 2.1
(stat.) \pm 2.5(syst.)$~fb at $\sqrt{s} = 10.52~\hbox{GeV}$ using an
89.5~fb$^{-1}$ continuum data sample. There is no significant $P_c(4312)^+$,
$P_c(4440)^+$ or $P_c(4457)^+$ signal found in the $pJ/\psi$ final states in
$\Upsilon(1,2S)$ inclusive decays. We determine the upper limits of
$\mathcal{B}\Upsilon(1,2S)\to P_c^{+} + anything \cdot \mathcal{B}(P_c^{+}\to
pJ/\psi)$ to be at the $10^{-6}$ level.
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