Amblypygi have a tropical and sub-tropical distribution and their first of the four pairs of legs, is modified as feelers. Their activity period and dark habitats render visual cues ineffective and ...they rely on non-visual sensory perception. There is agreement among researchers that the whip spiders invest in olfactory and tactile senses imparted by sensory structures concentrated on the tarsal segment of the first pair of long, well-articulated non-ambulatory legs that are constantly moved in all directions to sample the environment for detecting location of prey, as also for navigating. This is the first attempt to elucidate the sensory structures present on the antenniform legs of the whip spider, Phrynichus phipsoni (Pocock, 1894), collected from the state of Goa, India; using scanning electron micro1scope, and paves way for further research on sensory biology of this cryptic arachnid order. The examined specimen generally conforms to the diversity and morphology of sensory assemblage on the antenniform legs reported in other amblypygi species. Sensory structures elucidated include terminal trident tarsal claws, tarsal organ, bristles, porous sensilla, club sensilla, rod sensilla, slit sensilla, trichobothria, plate organ, pit organ and foliate leaf like hairs.
LHCb has a rich programme studying hadronic B-decays and is already showing that with early data it can produce precision measurements which improve on current world averages. The preliminary results ...presented include the new world's best measurements of the Acp(Bd -> K+ pi-) = -0.088 +/- 0.011 (stat) +/- 0.008 (syst) and tau(Bs -> K+ K-) = 1.440 +/- 0.096 (stat) +/- 0.010 (syst) ps. These were obtained using the full 2010 data sample containing 37 pb-1 and also 320 pb-1 of the 2011 data. The first observation of CP violation in Bs -> pi+ K- is also presented.
The performance of the ring-imaging Cherenkov detectors at the LHCb experiment is determined during the LHC Run 2 period between 2015 and 2018. The stability of the Cherenkov angle resolution and ...number of detected photons with time and running conditions is measured. The particle identification performance is evaluated with data and found to satisfy the requirements of the physics programme.
We report the final measurement of the neutrino oscillation parameters \(\Delta m^2_{32}\) and \(\sin^2\theta_{23}\) using all data from the MINOS and MINOS+ experiments. These data were collected ...using a total exposure of \(23.76 \times 10^{20}\) protons on target producing \(\nu_{mu}\) and \(\overline{\nu_\mu}\) beams and 60.75 kt\(\cdot\)yr exposure to atmospheric neutrinos. The measurement of the disappearance of \(\nu_{\mu}\) and the appearance of \(\nu_e\) events between the Near and Far detectors yields \(|\Delta m^2_{32}|=2.40^{+0.08}_{-0.09}~(2.45^{+0.07}_{-0.08}) \times 10^{-3}\) eV\(^2\) and \(\sin^2\theta_{23} = 0.43^{+0.20}_{-0.04} ~(0.42^{+0.07}_{-0.03})\) at 68% C.L. for Normal (Inverted) Hierarchy.
A search for mixing between active neutrinos and light sterile neutrinos has been performed by looking for muon neutrino disappearance in two detectors at baselines of 1.04 km and 735 km, using a ...combined MINOS and MINOS+ exposure of \(16.36\times10^{20}\) protons-on-target. A simultaneous fit to the charged-current muon neutrino and neutral-current neutrino energy spectra in the two detectors yields no evidence for sterile neutrino mixing using a 3+1 model. The most stringent limit to date is set on the mixing parameter \(\sin^2\theta_{24}\) for most values of the sterile neutrino mass-splitting \(\Delta m^2_{41} > 10^{-4}\) eV\(^2\).
Phys. Rev. Lett. 118, 231801 (2017) Results are reported from an improved measurement of $\nu_\mu \rightarrow
\nu_e$ transitions by the NOvA experiment. Using an exposure equivalent to
...$6.05\times10^{20}$ protons-on-target 33 $\nu_e$ candidates were observed with
a background of $8.2\pm0.8$ (syst.). Combined with the latest NOvA $\nu_\mu$
disappearance data and external constraints from reactor experiments on
$\sin^22\theta_{13}$, the hypothesis of inverted mass hierarchy with
$\theta_{23}$ in the lower octant is disfavored at greater than $93\%$ C.L. for
all values of $\delta_{CP}$.
Phys. Rev. Lett. 118, 151802 (2017) This Letter reports new results on muon neutrino disappearance from NOvA,
using a 14 kton detector equivalent exposure of $6.05\times10^{20}$
protons-on-target ...from the NuMI beam at the Fermi National Accelerator
Laboratory. The measurement probes the muon-tau symmetry hypothesis that
requires maximal mixing ($\theta_{23} = \pi/4$). Assuming the normal mass
hierarchy, we find $\Delta m^2 = (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and
$\sin^2 \theta_{23}$ at the two statistically degenerate values
$0.404^{+0.030}_{-0.022}$ and $0.624^{+0.022}_{-0.030}$, both at the 68%
confidence level. Our data disfavor the maximal mixing scenario with 2.6
$\sigma$ significance.