Abstract
We present measurements of rho ^0, omega and K^{*0} spectra in pi ^{-} + C production interactions at 158 text{ GeV }{/}text{ c } and rho ^0 spectra at 350 text{ GeV }{/}text{ c } using the NA61/SHINE spectrometer at the CERN SPS. Spectra are presented as a function of the Feynman’s variable x_text {F} in the range 0< x_text {F} < 1 and 0< x_text {F} < 0.5 for 158 and 350 text{ GeV }{/}text{ c } respectively. Furthermore, we show comparisons with previous measurements and predictions of several hadronic interaction models. These measurements are essential for a better understanding of hadronic shower development and for improving the modeling of cosmic ray air showers.
Highlights
When cosmic rays of high energy collide with the nuclei of the atmosphere, they initiate extensive air showers (EAS)
Preliminary spectra of unidentified hadrons and identified pions were previously derived from this data set [31,32,33] and in this paper, we present the results of the measurement of ρ0, ω and K∗0 spectra in π − + C interactions at 158 and 350 GeV/c
The yields of ρ0, ω, and K∗0 mesons in π − + C production interactions at 158 and 350 GeV/c were calculated in bins of xF as follows dn = 1 dNpart = C(xF) n(xF), (10)
Summary
When cosmic rays of high energy collide with the nuclei of the atmosphere, they initiate extensive air showers (EAS). Earth’s atmosphere acts as a medium in which the particle shower evolves. It proceeds mainly through the production and interaction of secondary pions and kaons. Depending on the particle energy and density of the medium in which the shower evolves, secondary particles either decay or reinteract, producing further secondaries. They immediately decay (cτ = 25 nm) into two photons with a branching ratio of 99.9%, giving rise to an electromagnetic shower component. When only the primary particle energy is of interest, and all shower components are sampled, a detailed understanding of the energy transfer from the hadronic particles to the electromagnetic shower component is not needed. For other measurements of air shower properties this understanding is of central importance
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