p¯−pAnnihilations toKandπMesons at 2.7 GeV/c

Abstract

We report results on the reactions p-\-p -> K+K+nir (n= 1, 2, • • •) at 2.7 GeV/c. The cross section for this process is estimated to be 4.1 ±0.6 mb. Comparison of 2.7-GeV/c partial cross sections with data at 3.0 and 3.7 GeV/c indicates that these partial cross sections either are relatively constant or slowly decrease with energy. K*(890) production is observed in all the four-, five-, and six-body final states. The production of p° and oi° is also observed. The KK mass spectra show enhancements near threshold as has been seen in other p-p experiments. The present data cannot distinguish between a resonance or S-wave scattering-length interpretation of these enhancements. No significant evidence for resonances decaying into Kinr or KKw was observed.

Nonlinear evolutions of an ultra-intense ultra-short laser pulse in a rarefied plasma through a new quasi-static theory

“…In LWFA, the intense laser pulse produces a relativistic, ultrahigh phase-velocity electron plasma-wave which is able to self-inject and accelerate electrons from the back-ground plasma up to very high energies, in the form of collimated bunches. The performance of LWFA crucially depends on the phase-velocity (which equals the pulse group-velocity) and the amplitude of the plasma-wave at the injection moment, both of which are dynamic quantities [3] during the propagation, owing to the nonlinear pulse evolutions [3][4][5][6][7][8][9][10]. Therefore, these pulse evolutions are very important to LWFA scenario [3][4][5][6][7][8][9][10] as well as the fundamental theory of light-plasma interactions.…”

“…Because a rarefied plasma (mostly applied in LWFA) shows a very weak optical responce, many authors have investigated the laser interaction with this plasma within the approximation of very slow pulse-envelope evolutions [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…For the first time, Bulanov etal [4] have generalized this approximation into the regime of strong wakefield excitation which includes LWFA. Later on, many authors have applied and extended this approach, in order to discuss different aspects of radiation and wakefield evolutions in LWFA [3,[5][6][7][8][9][10]18]. In one dimension, the main features of pulse evolutions in this regime are the gradual frequency red-shift due to depletion, accompanied by the pulse amplitude growth according to the universal adiabatic law [4].…”

“…In one dimension, the main features of pulse evolutions in this regime are the gradual frequency red-shift due to depletion, accompanied by the pulse amplitude growth according to the universal adiabatic law [4]. The amplitude growth then leads to the wakefield amplification in the course of time [3]. More recently, Schroeder etal [3] have applied the QSA to calculate the initial nonlinear pulse group-velocity and early-time variations of the electron plasma wave phase-velocity.…”

Light‐emitting diodes downregulate cathelicidin, kallikrein and toll‐like receptor 2 expressions in keratinocytes and rosacea‐like mouse skin

“…[7][8][9][10] Additionally, photobiomodulation in low-level light therapy (LLLT), which is based on the fact that light-emitting diode (LED)-emitted photons are absorbed by mitochondrial chromophores in skin cells, is a part of the rapidly growing field of non-thermal light therapies to find its way to the dermatology. 11,12 In this study, we aimed to determine the effects of LED irradiation at different wavelengths and doses, ranging from visible to infrared light, on cathelicidin, KLK5, KLK7 and protease activity induced by 1α, 25-dihydroxyvitamin D 3 (VD 3 ) and TLR-2 induced by Ad-CMV transfection in normal HKs. Based on the results of the in vitro study, we tried to confirm the effects of LED irradiation with specific wavelengths on rosacea-like mouse skin model.…”