Search results for "Sigma"
showing 10 items of 346 documents
"Table 2" of "Measurement of the polarization of Lambda0, anti-Lambda0, Sigma+ and Xi- produced in a Sigma- beam of 330-GeV/c"
1995
Target Consisted of a copper and a carbon block arranged side by side.
"Table 3" of "Measurement of the polarization of Lambda0, anti-Lambda0, Sigma+ and Xi- produced in a Sigma- beam of 330-GeV/c"
1995
Target Consisted of a copper and a carbon block arranged side by side.
"Table 1" of "Measurement of the polarization of Lambda0, anti-Lambda0, Sigma+ and Xi- produced in a Sigma- beam of 330-GeV/c"
1995
Target Consisted of a copper and a carbon block arranged side by side.
Measurement of the ZZ cross-section in e(+)e(-) interactions at 183-189 GeV
2001
Measurements of on-shell ZZ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies sqrt(s) = 182.6 GeV and 188.6 GeV respectively. Results obtained in each of the final states q qbar q qbar, mu+mu- q qbar, e+e- q qbar, nu nubar q qbar, l+l-l+l-, and nu nubar l+l- are presented. The measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs (NC02) are: sigma_{NC02}(182.6 GeV) = 0.38 +- 0.18 (stat) +- 0.04 (syst) pb, sigma_{NC02}(188.6 GeV) = 0.60 +- 0.13 (stat) +- 0.07 (syst) pb. They are consistent with the Standard Model expectations of 0.25 pb and 0.65 pb at each energy.
Measurement of e+ e- → DD cross sections at the ψ(3770) resonance
2018
Chinese physics / C High energy physics and nuclear physics C 42(8), 083001 (2018). doi:10.1088/1674-1137/42/8/083001
Measurement of e+e−→π+π−ψ(3686) from 4.008 to 4.600 GeV and observation of a charged structure in the π±ψ(3686) mass spectrum
2018
We study the process e(+)e(-) -> p(+)p(-)psi(3686) using 5.1 fb(-1) of data collected at 16 center-of-mass energy (root s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e(+)e(-) -> p(+)p(-)psi(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M = 4209.5 +/- 7.4 +/- 1.4 MeV/c(2) and Gamma = 80.1 +/- 24.6 +/- 2.9 MeV, and the second has M = 4383.8 +/- 4.2 +/- 0.8 MeV/c(2) and Gamma = 84.2 +/- 12.5 +/- 2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is obse…
Evidence for Muon Neutrino Oscillation in an Accelerator-Based Experiment
2005
We present results for muon neutrino oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced muon neutrino beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy dependent disappearance of muon neutrino, which we presume have oscillated to tau neutrino. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0 sigma).
Rosenbluth Separation of the π^{0} Electroproduction Cross Section.
2016
We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of G…
Sigmatisma korekcija 5 – 6 gadīgiem bērniem
2017
Maģistra darba nosaukums: „Sigmatisma korekcija 5 – 6 gadīgiem bērniem”. Darba autore: Liene Mačevska. Darba zinātniskā vadītāja: Dr. paed. profesore Sarmīte Tūbele. Darba saturs: 136 lappuses, 5 attēli, 10 tabulas, 18 pielikumi. Pētījuma mērķis: teorētiski izpētīt, pamatot un praktiski pārbaudīt dažādas sigmatisma korekcijas metodes 5 – 6 gadīgiem bērniem, lai veicinātu pareizu skaņu (svelpeņu, šņāceņu) izrunu. Pētījuma hipotēze: sigmatisma korekcija 5 – 6 gadīgiem bērniem norit veiksmīgi, ja: 1.tiek ņemtas vērā bērna attīstības īpatnības; 2.tiek izmantotas atbilstošas koriģējoši attīstošās metodes (vingrinājumi). Pētījuma teorētiskajā daļā, analizējot zinātnisko literatūru, autore aprakst…
"K0S0_dcs02" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"
2022
Excitation function at cos(Theta_K+)cm = -0.7