Further measurements on the production of π− and K− mesons and antiprotons at the 70 GeV IHEP accelerator

Abstract

Measurements on the production of intermediate momenta négative pions, négative kaons, and antiprotons by protons of 43 GeV, 52 GeV and 70 GeV on aluminium nuclei are reported. The production of high momentum (40 GeV/c to ~65 GeV/c) négative particles emitted from aluminium targets bombarded with protons up to 70 GeV has been measured previously and the results have already been reported [1]. Thèse measurements have been extended to lower mo menta secondary particles, namely to TT" and K' mesons and antiprotons with momenta between 25 GeV/c and 40 GeV/c (for 70 GeV protons). Preliminary results have been presented at the L und conférence [2].

First Observation of (Anti)Deuterons in DIS

“…The cross section ofd in e + e − → qq collisions [3] is lower than that measured in hadronic Υ(1S) and Υ(2S) decays, and disagrees with the predictions based on the LUND string model [4]. The (d) rate in e + e − → qq is also lower than that in hadronic (pA [5], pp [6]) and in γp collisions at HERA [7], but higher than that in nucleus-nucleus (AA) collisions [8].…”

Fluctuations in Calorimetry Measurements

“…In the marble calorimeter, which sees -85% of the total energy, the hadronic resolution is o(E).\/E= 53%, which agrees with eqs. (31) and (32) if the limiting resolution is -4O%/dE. This is smaller than the -SO%/dE derived by fitting the data reported in Figs.…”

Antideuterons as a probe of primordial black holes

“…4 of this article, with respect to the one given for antiprotons in Barrau et al (2002). This value is not surprising at it is in reasonable agreement with: -the Serpukhov experimental ratio of thep toD production cross-sections for proton-proton interactions measured at √ s = 11.5 GeV (between 1.9 × 10 −5 and 3.5 × 10 −5 depending on the transverse momentum) as given in Abranov et al (1987) and for proton-aluminium interactions measured at the same energy (7 × 10 −5 for a center of mass transverse momentum around 270 MeV) as given in Binon et al (1969); -the CERN-ISR experimental ratio of thep toD production cross-sections for proton-proton interactions measured at √ s = 53 GeV (between 10 −4 and 3.4 × 10 −4 ) as given in Alper et al (1973) and Gibson et al (1978); -the theoretical cosmic secondaryp toD ratio (around 10 −5 ) as given in Chardonnet et al (1997); -the theoretical cosmic primaryp toD ratio from neutralinos (around a few times 10 −4 ) as given in Donato et al (2000); -the simulated ratio ofp toD fluxes created within the Earth's atmosphere (around 10 −5 ) as evaluated with the program (Derome et al 2000) that was used to explain AMS experimental data (Derome, private communication).…”