7,618 research outputs found
Study on space-time structure of Higgs boson decay using HBT correlation Method in ee collision at =250 GeV
The space-time structure of the Higgs boson decay are carefully studied with
the HBT correlation method using ee collision events produced through
Monte Carlo generator PYTHIA 8.2 at =250GeV. The Higgs boson jets
(Higgs-jets) are identified by H-tag tracing. The measurement of the Higgs
boson radius and decay lifetime are derived from HBT correlation of its decay
final state pions inside Higgs-jets in the ee collisions events with an
upper bound of fm and fs. This result is consistent with CMS data.Comment: 7 pages,3 figure
2-Trifluoromethyl-1H-benzimidazol-3-ium perchlorate
In the title salt, C8H6F3N2
+·ClO4
−, the atoms of the benzimidazole ring (including H atoms) are nearly coplanar (r.m.s. deviation of the fitted atoms = 0.0122 Å) and the triflouromethyl group lies out of this plane. The perchlorate anion adopts a distorted tetrahedral conformation with the Cl—O bond distances ranging from 1.412 (3) to 1.439 (2) Å. The benzimidazolium cations are linked to adjacent anions by intermolecular N—H⋯O hydrogen bonds, forming chains
Observation of fast sound in two-dimensional dusty plasma liquids
Equilibrium molecular dynamics simulations are performed to study
two-dimensional (2D) dusty plasma liquids. Based on the stochastic thermal
motion of simulated particles, the longitudinal and transverse phonon spectra
are calculated, and used to determine the corresponding dispersion relations.
From there, the longitudinal and transverse sound speeds of 2D dusty plasma
liquids are obtained. It is discovered that, for wavenumbers beyond the
hydrodynamic regime, the longitudinal sound speed of a 2D dusty plasma liquid
exceeds its adiabatic value, i.e., the so-called fast sound. This phenomenon
appears at roughly the same length scale of the cutoff wavenumber for
transverse waves, confirming its relation to the emergent solidity of liquids
in the non-hydrodynamic regime. Using the thermodynamic and transport
coefficients extracted from the previous studies, and relying on the Frenkel
theory, the ratio of the longitudinal to the adiabatic sound speeds is derived
analytically, providing the optimal conditions for fast sound, which are in
quantitative agreement with the current simulation results.Comment: v1: 7 pages, 6 figure
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