The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupledchannel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizeable coupling
...strength of the NΣ ↔ NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs,
from zero relative momentum up to the opening of the NΣ channel. The correlation function in the
relative momentum space for pΛ⊕pΛ pairs measured in high-multiplicity triggered pp collisions at
√
s = 13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k
∗ = 289 MeV/c.
This represents the first direct experimental observation of the NΣ ↔ NΛ coupled channel in the pΛ
system. The correlation function is compared with recent chiral effective field theory calculations,
based on different strengths of the NΣ ↔ NΛ transition potential. A weaker coupling, as possibly
supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear
equation of state and for the presence of hyperons inside neutron stars.
Hypertension is the most important risk factor for cardiovascular morbidity and mortality. There is limited data on hypertension prevalence in India. This study was conducted to estimate the ...prevalence of hypertension among Indian adults.
A national level survey was conducted with fixed one-day blood pressure measurement camps across 24 states and union territories of India. Hypertension was defined as systolic blood pressure (BP) ≥140 mmHg or a diastolic BP ≥90 mmHg or on treatment for hypertension. The prevalence was age- and gender-standardized according to the 2011 census population of India.
Blood pressure was recorded for 180,335 participants (33.2% women; mean age 40.6 ± 14.9 years). Among them, 8,898 (4.9%), 99,791 (55.3%), 35,694 (11.9%), 23,084 (12.8%), 9,989 (5.5%), and 2,878 (1.6%) participants were of the age group 18–19, 20–44, 45–54, 55–64, 65–74, and ≥ 75 years, respectively. Overall prevalence of hypertension was 30.7% (95% confidence interval CI: 30.5, 30.9) and the prevalence among women was 23.7% (95% CI: 23.3, 24). Prevalence adjusted for 2011 census population and the WHO reference population was 29.7% and 32.8%, respectively.
There is a high prevalence of hypertension, with almost one in every three Indian adult affected.
We report the first demonstration of a phonon-mediated silicon detector technology that provides a primary phonon measurement in a low-voltage region, and a simultaneous indirect measurement of the ...ionization signal through Neganov–Trofimov–Luke amplification in a high voltage region, both in a monolithic crystal. We present characterization of charge and phonon transport between the two stages of the detector and the resulting background discrimination capability at low energies. This new detector technology has the potential to significantly enhance the sensitivity of dark matter and coherent neutrino scattering experiments beyond the capabilities of current technologies that have limited discrimination at low energies.
We report on the measurement of the size of the particle-emitting source from two-baryon correlations with ALICE in high-multiplicity pp collisions at s=13 TeV. The source radius is studied with low ...relative momentum p–p, p‾–p‾, p–Λ , and p‾–Λ‾ pairs as a function of the pair transverse mass mT considering for the first time in a quantitative way the effect of strong resonance decays. After correcting for this effect, the radii extracted for pairs of different particle species agree. This indicates that protons, antiprotons, Λ s, and Λ‾ s originate from the same source. Within the measured mT range (1.1–2.2) GeV/c2the invariant radius of this common source varies between 1.3 and 0.85 fm. These results provide a precise reference for studies of the strong hadron–hadron interactions and for the investigation of collective properties in small colliding systems.
Parity-odd domains, corresponding to nontrivial topological solutions of the QCD vacuum, might be created during relativistic heavy-ion collisions. These domains are predicted to lead to charge ...separation of quarks along the system's orbital momentum axis. We investigate a three-particle azimuthal correlator which is a P even observable, but directly sensitive to the charge separation effect. We report measurements of charged hadrons near center-of-mass rapidity with this observable in Au + Au and Cu + Cu collisions at square root of s(NN) = 200 GeV using the STAR detector. A signal consistent with several expectations from the theory is detected. We discuss possible contributions from other effects that are not related to parity violation.
Density fluctuations near the QCD critical point can be probed via an intermittency analysis in relativistic heavy-ion collisions. We report the first measurement of intermittency in Au+Au collisions ...at sNN = 7.7-200 GeV measured by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The scaled factorial moments of identified charged hadrons are analyzed at mid-rapidity and within the transverse momentum phase space. We observe a power-law behavior of scaled factorial moments in Au+Au collisions and a decrease in the extracted scaling exponent (ν) from peripheral to central collisions. The ν is consistent with a constant for different collisions energies in the mid-central (10-40%) collisions. Moreover, the ν in the 0-5% most central Au+Au collisions exhibits a non-monotonic energy dependence that reaches a minimum around sNN = 27 GeV. The physics implications on the QCD phase structure are discussed.
Phys. Rev. D 98, 071101 (2018) We have searched for the lepton-flavor-violating decay $B^{0}\to K^{\ast 0}
\mu^{\pm} e^{\mp}$ using a data sample of 711 $fb^{-1}$ that contains $772
\times 10^{6}$ ...$B\bar{B}$ pairs. The data were collected near the $\Upsilon
(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy
$e^{+}e^{-}$ collider. No signals were observed, and we set 90% confidence
level upper limits on the branching fractions of ${\cal B}(B^{0}\to K^{\ast 0}
\mu^{+} e^{-})< 1.2\times 10^{-7}$, ${\cal B}(B^{0}\to K^{\ast 0} \mu^{-}
e^{+})< 1.6\times 10^{-7}$, and, for both decays combined, ${\cal B}(B^{0}\to
K^{\ast 0} \mu^{\pm} e^{\mp}) < 1.8\times 10^{-7}$. These are the most
stringent limits on these decays to date.
We report the fabrication and performance of an annular, cryogenic, phonon-mediated veto detector that can host an inner target detector, allowing substantial reduction in radiogenic backgrounds for ...rare event search experiments. A germanium veto detector of mass ∼500 g with an outer diameter of 76 mm and an inner diameter of 28 mm was produced inside of which was mounted a 25 mm diameter germanium inner target detector of mass ∼10 g. The detector was designed using inputs from a GEANT4 based simulation, where it was modeled to be sandwiched between two germanium detectors. The simulation showed that the background rates (dominated by gamma interactions) could be reduced by > 90%, and that such an arrangement is sufficient for aggressive background reduction needed for neutrino and dark matter search experiments. Operating at mK temperatures at the experimental site, the veto detector prototype achieved a baseline resolution of 1.24 ± 0.02 keV while hosting a functional inner target detector. The baseline resolution of the inner target detector was 147 ± 2 eV. The experimental results of an identical detector arrangement are in excellent agreement with the simulation.
Phys. Rev. Lett. 121, 232001 (2018) We report the observation of $\Upsilon(2S)\to\gamma\eta_{b}(1S)$ decay based
on analysis of the inclusive photon spectrum of $24.7$ fb$^{-1}$ of $e^+ e^-$
...collisions at the $\Upsilon(2S)$ center-of-mass energy collected with the Belle
detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We measure a
branching fraction of
$\mathcal{B}(\Upsilon(2S)\to\gamma\eta_{b}(1S))=(6.1^{+0.6+0.9}_{-0.7-0.6})\times
10^{-4}$, and derive an $\eta_{b}(1S)$ mass of $9394.8^{+2.7+4.5}_{-3.1-2.7}$
MeV/$c^{2}$, where the uncertainties are statistical and systematic,
respectively. The significance of our measurement is greater than 7 standard
deviations, constituting the first observation of this decay mode.
The kinetics and mechanism of the reduction of ferricytochrome c Cyt c(III) by substrates namely glutathione (GSH) and L-cysteine (L-cys) have been investigated spectrophotometrically employing ...substrateT >> Cyt c(III)T. The reaction exhibits first order dependence in substrateT and Cyt c(III)T. The pseudo-first order rate constant increases with an increase in pH, indicating that the conjugate base form of the HCyt c(III) is a better oxidant than the parent HCyt c(III). The electron transfer rate constants between the oxidants and GSH for both the k1 and k2 paths are found to be greater than that with L-cysteine. Hence, GSH is a better reductant of Cyt c(III) as compared to L-cysteine. A suitable mechanism has been proposed on the basis of experimental findings. The deprotonation constant for HCyt c(III) and the second order rate constants of k1 and k2 paths for the present reaction at 25 degrees C have been determined.
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