2,346 research outputs found
Resolving the () ambiguity in
I propose an alternative method for measuring the violating phase
() without ambiguity in an extended SU(2) isospin triangle
analysis, which can ultimately be achieved by exploiting interference effects
between and in a
time-dependent flavour-tagged amplitude analysis. Under certain assumptions on
the effective in each channel, I demonstrate with an idealised
amplitude model that potential deviations in the measured due to
penguin contamination in are sufficiently large
within current experimental uncertainties that this programme could be executed
with Run 3 data at LHCb and easily at Belle II.Comment: 19 pages, 7 figures, replaced with journal versio
Rescaling the isospin triangle argument for constraining (): consolidating Belle II and a potential path forward for LHCb
A rescaling of the SU(2) isospin triangles constraining ()
that relies on measurements of the experimentally cleaner relative branching
fractions, as opposed to those absolute, is proposed. Paving the way towards
more systematically sustainable analysis, this method promises to eliminate a
dominant systematic at Belle II amongst others, namely the uncertainty on the
number of pairs in data. Furthermore, a constraint in the
system at LHCb that is more independent of Belle II input is
shown to become viable even without a measurement of violation in .Comment: 10 pages, 7 figures, replaced with journal version. This article
should be considered in conjunction with arXiv:2108.0618
Study of the Baryon-Antibaryon Low-Mass Enhancements in Charmless Three-body Baryonic B Decays
The angular distributions of the baryon-antibaryon low-mass enhancements seen
in the charmless three-body baryonic B decays B+ -> p pbar K+, B0 -> p pbar Ks,
and B0 -> p Lambdabar pi- are reported. A quark fragmentation interpretation is
supported, while the gluonic resonance picture is disfavored. Searches for the
Theta+ and Theta++ pentaquarks in the relevant decay modes and possible
glueball states G with 2.2 GeV/c2 < M-ppbar < 2.4 GeV/c2 in the ppbar systems
give null results. We set upper limits on the products of branching fractions,
B(B0 -> Theta+ p)\times B(Theta+ -> p Ks) Theta++
pbar) \times B(Theta++ -> p K+) G K+) \times
B(G -> p pbar) < 4.1 \times 10^{-7} at the 90% confidence level. The analysis
is based on a 140 fb^{-1} data sample recorded on the Upsilon(4S) resonance
with the Belle detector at the KEKB asymmetric-energy e+e- collider.Comment: 14 pages, 13 figure files, update of hep-ex/0409010 for journal
submisssio
Search for the h_c meson in B^+- ->h_c K^+-
We report a search for the meson via the decay chain , \etac \gamma with and
. No significant signals are observed. We obtain upper limits on the
branching fractions for in bins of the
invariant mass. The results are based on an analysis of 253
fb of data collected by the Belle detector at the KEKB
collider.Comment: 12 pages, 6 figures, submitted to Phys. Rev.
Evidence of time-dependent CP violation in the decay B0 to D*+D*-
We report a measurement of the CP-odd fraction and the time-dependent CP
violation in B0 to D*+D*- decays, using 657.10^6 BBbar events collected at the
Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy
e+e- collider. We measure a CP-odd fraction of
Rperp=0.125+/-0.043(stat)+/-0.023(syst). From the distributions of the
proper-time intervals between a B0to D*+D*- decay and the other B meson in the
event, we obtain evidence of CP violation with measured parameters
AD*+D*-=0.15+/-0.13(stat)+/-0.04(syst) and
SD*+D*-=-0.96+/-0.25(stat)-0.16+0.13(syst).Comment: Published in PR
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