11 research outputs found
Model-independent evidence for contributions to decays
The data sample of decays acquired with the
LHCb detector from 7 and 8~TeV collisions, corresponding to an integrated
luminosity of 3 fb, is inspected for the presence of or
contributions with minimal assumptions about
contributions. It is demonstrated at more than 9 standard deviations that
decays cannot be described with
contributions alone, and that contributions play a dominant role in
this incompatibility. These model-independent results support the previously
obtained model-dependent evidence for charmonium-pentaquark
states in the same data sample.Comment: 21 pages, 12 figures (including the supplemental section added at the
end
Quantum numbers of the state and orbital angular momentum in its decay
Angular correlations in decays, with , and , are used to measure
orbital angular momentum contributions and to determine the value of
the meson. The data correspond to an integrated luminosity of 3.0
fb of proton-proton collisions collected with the LHCb detector. This
determination, for the first time performed without assuming a value for the
orbital angular momentum, confirms the quantum numbers to be .
The is found to decay predominantly through S wave and an upper limit
of at C.L. is set on the fraction of D wave.Comment: 16 pages, 4 figure
In rice, Oryzalin and abscisic acid differentially affect tubulin mRNA and protein levels
The effect of the anti-microtubular drug Oryzalin (3,5-dinitro-N4,N4-dipropylsulfanilamide) on growth and elongation of rice (Oryza sativa L. cv. Arborio) roots and coleoptiles was investigated. At 100 nM, Oryzalin strongly reduced primary root elongation, caused loss of cell anisotropy and the disappearance of the cortical microtubule array. Under these conditions the amounts of alpha- and beta-tubulin protein, but not mRNA, were heavily reduced. Similar data were also obtained in coleoptile segments treated with different concentrations of Oryzalin. However, when coleoptile elongation was inhibited by cis-abscisic acid, remarkable decreases in alpha- and beta-tubulin accumulation were observed to occur at the mRNA level but not at the protein level. The transcriptional decreases could be reversed by re-addition of 3-indole acetic acid. Altogether, these data indicate that rice tubulin accumulation can be controlled at different levels, mRNA or protein, in response to Oryzalin or abscisic acid treatments
Identification of Surgically Curable Primary Aldosteronism by Imaging in a Large Multiethnic International Study
Adrenal glands imaging is recommended by the current guidelines for the work-up of primary aldosteronism (PA). However, its diagnostic performance has not been established in large multi-ethnic cohorts of patients submitted to adrenal vein sampling (AVS) and adrenalectomy
Measurement of CP violation and constraints on the CKM angle γ in B± → DK± with D → K0Sπ+π− decays
A model-dependent amplitude analysis of B± → DK± with D → K0
Sπ+π− decays is performed using
proton–proton collision data, corresponding to an integrated luminosity of 1 fb−1, recorded by LHCb at
a centre-of-mass energy of 7 TeV in 2011. Values of the CP violation observables x± and y±, which are
sensitive to the CKM angle γ, are measured to be
x− = +0.027 ± 0.044+0.010 −0.008 ± 0.001,
y− = +0.013 ± 0.048+0.009 −0.007 ± 0.003,
x+ = −0.084 ± 0.045 ± 0.009 ± 0.005,
y+ = −0.032 ± 0.048+0.010 −0.009 ± 0.008,
where the first uncertainty is statistical, the second systematic and the third arises from the uncertainty of
the D → K0
Sπ+π− amplitude model. The value of γ is determined to be (84+49
−42)◦, including all sources
of uncertainty. Neutral D meson mixing is found to have negligible effect
Precision Measurement of CP Violation in B-S(0) -> J/Psi K+K- Decays
The time-dependent CP asymmetry in Bs0\u2192J/\u3c8K+K- decays is measured using pp collision data, corresponding to an integrated luminosity of 3.0fb-1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96000 Bs0\u2192J/\u3c8K+K- decays, the CP-violating phase \u3c6s is measured, as well as the decay widths \u393L and \u393H of the light and heavy mass eigenstates of the Bs0-B\uafs0 system. The values obtained are \u3c6s=-0.058\ub10.049\ub10.006rad, \u393s 61(\u393L+\u393H)/2=0.6603\ub10.0027\ub10.0015ps-1, and \u394\u393s 61\u393L-\u393H=0.0805\ub10.0091\ub10.0032ps-1, where the first uncertainty is statistical and the second, systematic. These are the most precise single measurements of those quantities to date. A combined analysis with Bs0\u2192J/\u3c8\u3c0+\u3c0- decays gives \u3c6s=-0.010\ub10.039rad. All measurements are in agreement with the standard model predictions. For the first time, the phase \u3c6s is measured independently for each polarization state of the K+K- system and shows no evidence for polarization dependence
Observation of Two New Xi(-)(b) Baryon Resonances
Two structures are observed close to the kinematic threshold in the \u39eb0\u3c0- mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0fb-1, recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=(1/2)+ and JP=(3/2)+ states, denoted \u39eb\u2032- and \u39eb 17-. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(\u39eb\u2032-)-m(\u39eb0)-m(\u3c0-)=3.653\ub10.018\ub10.006MeV/c2, m(\u39eb 17-)-m(\u39eb0)-m(\u3c0-)=23.96\ub10.12\ub10.06MeV/c2, \u393(\u39eb 17-)=1.65\ub10.31\ub10.10MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of \u393(\u39eb\u2032-)<0.08MeV at 95% confidence level. Relative production rates of these states are also reported
Measurement of CP violation and constraints on the CKM angle gamma in B-+/- -> DK +/- with D -> K-s(0)pi(+)pi(-) decays
A model-dependent amplitude analysis of B-+/- -> DK +/- with D -> K-s(0)pi(+)pi(-) decays is performed using proton proton collision data, corresponding to an integrated luminosity of 1 fb(-1), recorded by LHCb at a centre-of-mass energy of 7 TeV in 2011. Values of the CP violation observables x +/- and y +/-, which are sensitive to the CKM angle gamma, are measured to be x- = +0.027 +/- 0.0441(-0.008)(+0.010) +/- 0.001, y- = +0.013 +/- 0.0481(-0.007)(+0.009) +/- 0.003, x+ = -0.084 +/- 0.045 +/- 0.009 +/- 0.005, y+ = -0.032 +/- 0.048(-0.009)(+0.010) +/- 0.008, where the first uncertainty is statistical, the second systematic and the third arises from the uncertainty of the D -> K-S(0)pi(+)pi(-) amplitude model. The value of gamma is determined to be (84(-42)(+49))degrees including all sources of uncertainty. Neutral D meson mixing is found to have negligible effect
Erratum: Measurement of the -Quark Production Cross Section in 7 and 13 TeV Collisions [Phys. Rev. Lett. 118 , 052002 (2017)]
No abstract available