549 research outputs found
Subaqueous shrinkage cracks in the Sheepbed mudstone: Implications for early fluid diagenesis, Gale crater, Mars
The Sheepbed mudstone, Yellowknife Bay formation, Gale crater, represents an ancient lakebed now exhumed and exposed on the Martian surface. The mudstone has four diagenetic textures, including a suite of early diagenetic nodules, hollow nodules, and raised ridges and later diagenetic light-toned veins that crosscut those features. In this study, we describe the distribution and characteristics of the raised ridges, a network of short spindle-shaped cracks that crosscut bedding, do not form polygonal networks, and contain two to four layers of isopachous, erosion-resistant cement. The cracks have a clustered distribution within the Sheepbed member and transition laterally into concentrations of nodules and hollow nodules, suggesting that these features formed penecontemporaneously. Because of the erosion-resistant nature of the crack fills, their three-dimensional structure can be observed. Cracks that transition from subvertical to subhorizontal orientations suggest that the cracks formed within the sediment rather than at the surface. This observation and comparison to terrestrial analogs indicate that these are syneresis cracksâcracks that formed subaqueously. Syneresis cracks form by salinity changes that cause sediment contraction, mechanical shaking of sediment, or gas production within the sediment. Examination of diagenetic features within the Sheepbed mudstone favors a gas production mechanism, which has been shown to create a variety of diagenetic morphologies comparable to the raised ridges and hollow nodules. The crack morphology and the isopachous, layered cement fill show that the cracks were filled in the phreatic zone and that the Sheepbed mudstone remained fluid saturated after deposition and through early burial and lithification
Artificial Intelligence in Supply Chain Operations Planning: Collaboration and Digital Perspectives
[EN] Digital transformation provide supply chains (SCs) with extensive accurate data that should be combined with analytical techniques to improve their management. Among these techniques Artificial Intelligence (AI) has proved their suitability, memory and ability to manage uncertain and constantly changing information. Despite the fact that a number of AI literature reviews exist, no comprehensive review of reviews for the SC operations planning has yet been conducted. This paper aims to provide a comprehensive review of AI literature reviews in a structured manner to gain insights into their evolution in incorporating new ICTs and collaboration. Results show that hybrization man-machine and collaboration and ethical aspects are understudied.This research has been funded by the project entitled NIOTOME (Ref. RTI2018-102020-B-I00) (MCI/AEI/FEDER, UE). 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Measurements of Charmless Hadronic b->s Penguin Decays in the pi+pi-K+pi- Final State and First Observation of B0 -> rho0K+pi-
We report measurements of charmless hadronic B^0 decays into the pi+pi-K+pi+
final state. The analysis uses a sample of 657x10^6 BBbar pairs collected with
the Belle detector at the KEKB asymmetric-energy e+e- collider at the Y(4S)
resonance. The decay B^0 -> rho0 Kpi is observed for the first time; the
significance is 5.0sigma and the corresponding partial branching fraction for
M_Kpi in (0.75,1.20) GeV/c^2 is [2.8 +- 0.5(stat) +-0.5(syst)] x 10^{-6}. We
also obtain the first evidence for B^0 -> f0Kpi with 3.5sigma significance and
for B^0 -> pi+pi-K*0 with 4.5sigma significance. For the two-body decays B^0 ->
rho0K*0 and B^0 -> f0K*0, the significances are 2.7sigma and 2.5sigma,
respectively, and the upper limits on the branching fractions are 3.4x10^{-6}
and 2.2x10^{-6} at 90% confidence level.Comment: 6 pages, 3 figures. accepted by PRD(RC
Dalitz analysis of B --> K pi psi' decays and the Z(4430)+
From a Dalitz plot analysis of B --> K pi psi' decays, we find a signal for
Z(4430)+ --> pi+ psi' with a mass M= (4443(+15-12)(+19-13))MeV/c^2, width
Gamma= (107(+86-43)(+74-56))MeV, product branching fraction BR(B0 --> K-
Z(4430)+) x BR(Z(4430)+ --> pi+ psi')= (3.2(+1.8-0.9)(+5.3-1.6)) x 10^{-5}, and
significance of 6.4sigma that agrees with previous Belle measurements based on
the same data sample. In addition, we determine the branching fraction BR(B^0
--> K*(892)^0 psi')= (5.52(+0.35-0.32)(+0.53-0.58)) x 10^{-4} and the fraction
of K*(892)^0 mesons that are longitudinally polarized f_L=
44.8(+4.0-2.7)(+4.0-5.3)%. These results are obtained from a 605fb^{-1} data
sample that contains 657 million B-anti-B pairs collected near the Upsilon(4S)
resonance with the Belle detector at the KEKB asymmetric energy e+e- collider.Comment: Final version published in PRD(RC
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
Study of the decay
We present a study of with X(3872) decaying to using a sample of 657 million pairs recorded at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider. Both and decay
modes are used. We find a peak of events with a mass of
, a width of and a product branching fraction , where the first errors are statistical
and the second ones are systematic. The significance of the signal is
. The difference between the fitted mass and the
threshold is calculated to be . We
also obtain an upper limit on the product of branching fractions of at
90% CL.Comment: 7 pages, 3 figures, BELLE-CONF-0832 contributed to ICHEP 2008,
revised and submitted to Phys. Rev. D R
Search for the X(1812) in
We report on a search for the X(1812) state in the decay with a data sample of pairs collected
with the Belle detector at the KEKB collider. No significant signal is
observed. An upper limit (90% C.L.) is determined. We also constrain the
three-body decay branching fraction to be 1.9 (90% C.L.).Comment: 5pages,2 figures(3 figure files). submitted to PRD(RC
Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
The process e+e- to K+K-J/psi is observed for the first time via initial
state radiation. The cross section of e+e- to K+K-J/psi for center-of-mass
energies between threshold and 6.0 GeV is measured using 673 fb^{-1} of data
collected with the Belle detector on and off the Upsilon(4S) resonance. We also
find evidence for e+e- to K_S K_S J/psi in the same energy region.Comment: Version to appear in Physical Review D (RC
Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance
We report the first observation of e+e- -> Upsilon(1S)pi+pi-,
Upsilon(2S)pi+pi-, and first evidence for e+e- -> Upsilon(3S)pi+pi-,
Upsilon(1S)K+K-, near the peak of the Upsilon(5S) resonance at sqrt{s}~10.87
GeV. The results are based on a data sample of 21.7 fb^-1 collected with the
Belle detector at the KEKB e+e- collider. Attributing the signals to the
Upsilon(5S) resonance, the partial widths Gamma(Upsilon(5S) -> Upsilon(1S)
pi+pi-) = 0.59 +- 0.04 (stat) +- 0.09 (syst) MeV and Gamma(Upsilon(5S) ->
Upsilon(2S) pi+pi-) = 0.85 +- 0.07 (stat) +- 0.16 (syst) MeV are obtained from
the observed cross sections. These values exceed by more than two orders of
magnitude the previously measured partial widths for dipion transitions between
lower Upsilon resonances.Comment: 6 pages, 4 figures, submit to PR
Observation of B0 to p pbar K*0 with a large K*0 polarization
We observe the decay B0 to p pbar K*0 with a branching fraction of
(1.18^{+0.29}_{-0.25} (stat.) \pm 0.11 (syst.)) \times 10^{-6}. The statistical
significance is 7.2 sigma for the signal in the low ppbar mass region. We study
the decay dynamics of B0 to p pbar K*0 and compare it with B+ to p pbar K*+.
The K*0 meson is found to be almost 100% polarized (with a fraction of (101 \pm
13 \pm 3)% in the helicity zero state), while the K*+ meson has a (32 \pm 17
\pm 9)% fraction in the helicity zero state. The direct CP asymmetries for B0
to p pbar K*0 and B+ to p pbar K*+ are measured to be -0.08\pm 0.20\pm 0.02 and
-0.01\pm 0.19\pm 0.02, respectively. We also study the characteristics of the
low mass ppbar enhancements near threshold and the associated angular
distributions. In addition, we report improved measurements of the branching
fractions BF(B+ to p pbar K*+) = (3.38^{+0.73}_{-0.60} \pm 0.39) \times 10^{-6}
and BF(B0 to p pbar K0) = (2.51^{+0.35}_{-0.29} \pm 0.21) \times 10^{-6}, which
supersede our previous measurements. These results are obtained from a 492
fb^{-1} data sample collected near the Upsilon(4S) resonance with the Belle
detector at the KEKB asymmetric-energy e^+ e^- collider.Comment: 11 pages, 4 figures (8 figure files), submitted to Phys.Rev.Let
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