Antineutrino Interactions in the 14' H(2)-Neon BC

Abstract

SummaryWe propose a 50-100,000 photo exploratory exposure of the 14' BC filled with ~30% Neon, 70% H 2 , to a broad band v beam produced by whatever intensity (~ 10 12 IP/pulse and energy (~ 200 GeV) external proton beam is initially available. The Ne-H 2 mixture permits ~10 x higher event rate than pure H 2 ; also direct detection of ~, ~, nj better ~±, e± identification and the possibility of coherent production reactions from the nucleus as a whole as well as incoherent reactions from both neutrons and protons. The event rate vs. E-and q 2 will be 2 as well as comparison of crT on nand p and of these with corresponding v cross sections. Cross sections, particle momenta, invariant mass and angular correlation spectra will be measured for dominant channels permitting crude tests of ~I = 1, ~I = 1/2, ~S = ~Q, ~S I 2 rules. New particles and phenomena will be searched for.

Pion-kaon scattering near the threshold in chiral SU(2) perturbation theory

“…As in the case of T − πK , the scattering lengths are consistent with the result of [7], whereas, as can be seen from equation (27) and definition (23), the effective range parameter b + 0 is half the size. This cannot be due to the fact that the authors of [7] use older values for the χSU(3) constants, since the effect of this would be too small.…”

“…The values are in chronological order. The interval in the second column is chosen so as to cover the experimental results for a (1/2) 0 [27] and a (3/2) 0 [28]. References [29] and [30] are dispersion relation analyses based on more recent experiments, [16] and [15,16] respectively, with much more data.…”

Inverse amplitude method in chiral perturbation theory

“…The other two curves are both obtained from the IAM: the dashed one again with the same parameters and the continuous one with those in the third line of Table 4. The experimental data come from: [38] (•), [39] (⋆), [40] (•), [41] (♦), [42] (✷) and [43] (△). The straight dotted line stands at δ = 90 0 .…”

Resonances from meson-meson scattering inU(3)χPT

“…Kπ→Kπ corresponds to the average data from Refs. [71,72,73] (square in blue), as used in Ref. [10], and Ref.…”