We report measurements of B→χ(c1)γK and χ(c2)γK decays using 772×10(6) BBover ¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. ...Evidence of a new resonance in the χ(c1)γ final state is found with a statistical significance of 3.8σ. This state has a mass of 3823.1±1.8(stat)±0.7(syst) MeV/c(2), a value that is consistent with theoretical expectations for the previously unseen 1(3)D(2) ccover ¯ meson. We find no other narrow resonance and set upper limits on the branching fractions of the X(3872)→χ(c1)γ and χ(c2)γ decays.
We report the first evidence for the η(b)(2S) using the h(b)(2P)→η(b)(2S)γ transition and the first observation of the h(b)(1P)→η(b)(1S)γ and h(b)(2P)→η(b)(1S)γ transitions. The mass and width of the ...η(b)(1S) and η(b)(2S) are measured to be m(η(b)(1S))=(9402.4±1.5±1.8) MeV/c(2), m(η(b)(2S))=(9999.0±3.5(-1.9)(+2.8)) MeV/c(2), and Γ(η(b)(1S))=(10.8(-3.7-2.0)(+4.0+4.5)) MeV. We also update the h(b)(1P) and h(b)(2P) mass measurements. We use a 133.4 fb(-1) data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb(-1) data sample collected by the Belle detector at or near the Υ(nS) (n = 1,2,…,5) resonances. The Y(4260) ...state is observed, and its resonance parameters are determined. In addition, an excess of π+ π- J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260) → π+ π- J/ψ decays, a structure is observed in the M(π(±)J/ψ) mass spectrum with 5.2σ significance, with mass M = (3894.5 ± 6.6 ± 4.5) MeV/c2 and width Γ = (63 ± 24 ± 26) MeV/c2, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.
We report the observation of two narrow structures in the mass spectra of the π(±)Υ(nS) (n=1, 2, 3) and π(±)h(b)(mP) (m=1, 2) pairs that are produced in association with a single charged pion in ...Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M(1)=(10,607.2±2.0) MeV/c2, Γ(1)=(18.4±2.4) MeV, and M(2)=(10,652.2±1.5) MeV/c2, Γ(2)=(11.5±2.2) MeV. The results are obtained with a 121.4 fb(-1) data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e+ e- collider.
We report an observation of the
$B^{\pm } \to J/\psi \eta K^{\pm }$
and
$B^0 \to J/\psi \eta K^0_S$
decays using
$772\times 10^{6}B\overline {B}$
pairs collected at the
$\Upsilon (4S)$
resonance with ...the Belle detector at the KEKB asymmetric-energy
$e^+e^-$
collider. We obtain the branching fractions
${\mathcal B}(B^{\pm }\rightarrow J/\psi \eta K^{\pm })=(1.27\pm 0.11(\hbox {stat.})\pm 0.11(\hbox {syst.}))\times 10^{-4}$
and
${\mathcal B}(B^0\to J/\psi \eta K^0_S)=(5.22 \pm 0.78 (\hbox {stat.}) \pm 0.49 (\hbox {syst.}))\times 10^{-5}$
. We search for a new narrow charmonium(-like) state
$X$
in the
$J/\psi \eta $
mass spectrum and find no significant excess. We set upper limits on the product of branching fractions,
${\mathcal B}(B^\pm \to XK^\pm){\mathcal B}(X \to J/\psi \eta)$
, at
$3872\,\hbox {MeV}\,c^{-2}$
where a
$C$
-odd partner of
$X(3872)$
may exist, at
$\psi (4040)$
and
$\psi (4160)$
assuming their known mass and width, and over a range from 3.8 to
$4.8\,\hbox {GeV}\,c^{-2}$
. The obtained upper limits at 90% confidence level for
$X^{C\hbox {-}{\rm odd}}(3872)$
,
$\psi (4040)$
, and
$\psi (4160)$
are
$3.8\times 10^{-6}$
,
$15.5\times 10^{-6}$
, and
$7.4\times 10^{-6}$
, respectively.
The Physics of the B Factories Golob, Bostjan; Mannel, Thomas; Bevan, Adrian
The European physical journal. C, Particles and fields,
March 2015, Volume:
74, Issue:
11
eBook, Journal Article
(ProQuest: ... denotes formulae and/or non-USASCII text omitted) We report new measurements of the total cross sections for e super(+)e super(-) arrow right Upsilon(n S)pi super(+)pi super(-)(n=1, 2, ...3) and e super(+)e super(-) arrow right bb from a high-luminosity fine scan of the region sradical=10.63-11.05GeV with the Belle detector. We observe that the Upsilon(nS)pi super(+)pi super(-) spectra have little or no nonresonant component and extract from them the masses and widths of Upsilon(10860) and Upsilon(11020) and their relative phase. We find ...MeV/c super(2) and ...MeV and report first measurements ...MeV/c super(2), ...MeV, and ...rad.
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