The KLOE electromagnetic calorimeter Lee-Franzini, Juliet; Antonelli, A.; Antonelli, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/1995, Letnik:
360, Številka:
1-2
Journal Article
Recenzirano
A general purpose detector, KLOE, is under construction for operations at the Frascati φ factory, DAΦNE. Its central mission is the study of direct CP violation in K0 decays, which places very ...stringent requirements on electromagnetic shower measurements in the 20–280 MeV/c region. We have chosen to use a lead-scintillator sampling calorimeter, EmC, consisting of very thin (0.5 mm) lead layers in which are embedded 1 mm diameter scintillating fibers. Much prototyping and testing has been done during its design, yielding, for the final EmC, an expected energy resolution of σ(E)/E ∼ 4.4%/EGeV and a time resolution of ∼ 46ps/EGeV, with excellent linearity in the region of interest and with little dependence on incidence angle and entry position.
In this paper we present the results of a search for nuclearites in the penetrating cosmic radiation using the scintillator and track-etch subdetectors of the MACRO apparatus. The analyses cover the ...\(\beta =v/c\) range at the detector depth (3700 {\rm hg/cm^2}) \(10^{-5} < \beta < 1\); for \(\beta = 2 \times 10^{-3}\) the flux limit is \(2.7\times 10^{-16}{\rm cm^{-2}s^{-1}sr^{-1}}\) for an isotropic flux of nuclearites, and twice this value for a flux of downgoing nuclearites.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) We present a measurement of eta meson production in photon-photon interactions produced by electron-positron beams ...colliding with ... GeV. The measurement is done with the KLOE detector at the -factory DAPhiNE with an integrated luminosity of 0.24 fb^sup -1^. The e ^sup +^ e ^sup -^ arrow right e ^sup +^ e ^sup -^ eta cross section is measured without detecting the out-going electron and positron, selecting the decays eta arrow right pi ^sup +^ pi ^sup -^ pi ^sup 0^ and eta arrow right pi ^sup 0^ pi ^sup 0^ pi ^sup 0^. The most relevant background is due to e ^sup +^ e ^sup -^ arrow right etaγ when the monochromatic photon escapes detection. The cross section for this process is measured as sigma(e ^sup +^ e ^sup -^ arrow right etaγ) = (856±8^sub stat^±16^sub syst^) pb. The combined result for the e ^sup +^ e ^sup -^ arrow right e ^sup +^ e ^sup -^ eta cross section is sigma(e ^sup +^ e ^sup -^ arrow right e ^sup +^ e ^sup -^ eta) = (32.72±1.27^sub stat^±0.70^sub syst^) pb. From this we derive the partial width Gamma(eta arrow right γγ) = (520±20^sub stat^±13^sub syst^) eV. This is in agreement with the world average and is the most precise measurement to date.
We report on the first measurement of the flux of upgoing muons resulting from interactions of atmospheric neutrinos in the rock below MACRO. The ratio of the observed to the expected number of ...events integrated over all nadir angles is 0.73 ± .09
stat. ± .06
sys. ± .12
theor.. The flux of upgoing muons as a function of nadir angle is presented and compared to Monte Carlo expectations. At the 90% confidence level, the data are consistent with no neutrino oscillations or some possible oscillation hypothese with the parameters suggested by the Kamiokande contained-event analysis.
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