We present the recent measurements of the B0 -> eta' K0 and the B -> omega K decay modes based on the full data set of 772x10^6 BBbar pairs collected by the Belle detector at the KEKB e+e- collider. ...In the B0 -> eta' K^{0} mode, we obtain the CP-violating parameters A(eta'K0) = +0.03+/-0.05(stat)+/-0.04(syst), S(eta'K0) = +0.68+/-0.07(stat)+/-0.03(syst). This is the world's most precise result on the eta' K0 CP parameters. In B -> omega K decays, we measure the branching fractions B(B0 -> omega K0) = (4.5+/-0.4(stat)+/-0.3(syst))x10^-6, B(B- -> omega K-) = (6.8+/-0.4(stat)+/-0.4(syst))x10^-6, which are their current most precise results. We measure the first evidence of CP violation in the B0 -> omega K0S decay mode, obtaining the CP-violating parameters A(omega K0S} = -0.36+/-0.19(stat)+/-0.05(syst), S(omega K0S} = +0.91+/-0.32(stat)+/-0.05(syst). In the B- -> omega K- mode, we measure the direct CP-violation parameter A(omega K-) = -0.03+/-0.04(stat)+/-0.01(syst), which is its most precise measurement to date.
Evidence for B¯s0→Λc+Λ¯π Adachi, I.; Asner, D. M.; Aushev, T. ...
Physics letters. B,
08/2013, Letnik:
726, Številka:
1-3
Journal Article
Recenzirano
Odprti dostop
Using 121.4 fb–1 of data collected with the Belle detector at the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider, we report evidence for the B¯$^{0}_{s}$ → Λ$^{+}_{c}$Λ¯π– decay mode ...with a measured branching fraction (3.6 ± 1.1stat.$^{+0.3}_{-0.5}$syst. ± 0.9Λ$^{+}_{c}$ ± 0.7 NB¯$^{0}_{s}$) x 10–4 and a significance of 4.4 standard deviations. Here, this is the first evidence for a baryonic B$^{0}_{s}$ decay.
We report a high-statistics measurement of the differential cross section of the process $γγ → K^0_S K^0_S$ in the range 1.05 GeV $≤ W ≤$ 4.00 GeV, where $W$ is the center-of-mass energy of the ...colliding photons, using 972 fb-1 of data collected with the Belle detector at the $KEKB$ asymmetric-energy $e^+ e^-$ collider operated at and near the $Υ$-resonance region. The differential cross section is fitted by parameterized S-, D0-, D2-, G0- and G2-wave amplitudes. In the D2 wave, the $f_2$(1270), $a_2$(1320) and $f^\prime_2$(1525) are dominant and a resonance, the $f_2$(2200), is also present. The $f_0$(1710) and possibly the $f_0$(2500) are seen in the $S$ wave. The mass, total width and product of the two-photon partial decay width and decay branching fraction to the $K\overline{K}$ state $Γ_{γγ}(ΒK\overline{K})$ are extracted for the $f^\prime_2$(1525), $f_0$(1710), $f_2$(2200) and $f_0$(2500). The destructive interference between the $f_2$(1270) and $a_2$(1320) is confirmed by measuring their relative phase. The parameters of the charmonium states $Χ_{c0}$ and $Χ_{c2}$ are updated. Possible contributions from the $Χ_{c0}(2P)$ and $Χ_{c2}(2P)$ states are discussed. A new upper limit for the branching fraction of the $P-$ and $CP-$violating decay channel $η_c → K^0_S K^0_S$ is reported. The detailed behavior of the cross section is updated and compared with $QCD$-based calculations.
(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.
A
bstract
We present measurements of absolute branching fractions of hadronic and lep-tonic
decays to
K
−
K
+
π
+
,
K
+
,
ηπ
+
,
μ
+
ν
μ
and
τ
+
ν
τ
and report a search for the leptonic
→
e
+
ν
e
...decays. The results are obtained from a data sample of 913 fb
−1
collected at or near the
(4
S
) and
(5
S
) resonances with the Belle detector at the KEKB asymmetric-energy
e
+
e
−
collider. The branching fractions of hadronic decays are measured to be
where the first and second uncertainties are statistical and systematic, respectively. The branching fractions of leptonic decays are measured to be
which are combined to determine the
meson decay constant
We find no significant signal for
→
e
+
ν
e
decays and set an upper limit of
<
1
.
0(0
.
83)
×
10
−4
at 95% (90%) confidence level.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract We present measurements of absolute branching fractions of hadronic and lep-tonic ... decays to K ^sup -^ K ^sup ...+^ pi ^sup +^, ... K ^sup +^, ηπ ^sup +^, mu ^sup +^ nu ^sub mu^ and tau ^sup +^ nu ^sub tau^ and report a search for the leptonic ... arrow right e ^sup +^ nu ^sub e^ decays. The results are obtained from a data sample of 913 fb^sup -1^ collected at or near the ...(4S) and ...(5S) resonances with the Belle detector at the KEKB asymmetric-energy e ^sup +^ e ^sup -^ collider. The branching fractions of hadronic decays are measured to be ...where the first and second uncertainties are statistical and systematic, respectively. The branching fractions of leptonic decays are measured to be ...which are combined to determine the ... meson decay constant ... We find no significant signal for ... arrow right e ^sup +^ nu ^sub e^ decays and set an upper limit of ... < 1.0(0.83) × 10^sup -4^ at 95% (90%) confidence level. Figure not available: see fulltext.
Phys. Rev. D 107, 052008 (2023) This paper reports world averages of measurements of $b$-hadron, $c$-hadron,
and $\tau$-lepton properties obtained by the Heavy Flavour Averaging Group
using results ...available before April 2021. In rare cases, significant results
obtained several months later are also used. For the averaging, common input
parameters used in the various analyses are adjusted (rescaled) to common
values, and known correlations are taken into account. The averages include
branching fractions, lifetimes, neutral meson mixing parameters, CP violation
parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa
matrix elements.
The LHCb experiment at CERN is undergoing an upgrade in preparation for the Run 3 data taking period of the LHC. As part of this upgrade the trigger is moving to a fully software implementation ...operating at the LHC bunch crossing rate. We present an evaluation of a CPU-based and a GPU-based implementation of the first stage of the High Level Trigger. After a detailed comparison both options are found to be viable. This document summarizes the performance and implementation details of these options, the outcome of which has led to the choice of the GPU-based implementation as the baseline.
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