Measurements of production properties ofKS0mesons andΛhyperons in proton-carbon interactions at 31 GeV/c

Abstract

Spectra of K 0S mesons and hyperons were measured in p + C interactions at 31 GeV/c with the large acceptance NA61/SHINE spectrometer at the CERN SPS. The data were collected with an isotropic graphite target with a thickness of 4% of a nuclear interaction length. Interaction cross sections, charged pion spectra, and charged kaon spectra were previously measured using the same data set. Results on K 0 S and production in p + C interactions serve as a reference for the understanding of the enhancement of strangeness production in nucleus-nucleus collisions. Moreover, they provide important input for the improvement of neutrino flux predictions for the T2K long baseline neutrino oscillation experiment in Japan. Inclusive production cross N. ABGRALL et al. PHYSICAL REVIEW C 89, 025205 (2014) sections for K 0 S and are presented as a function of laboratory momentum in intervals of the laboratory polar angle covering the range from 0 up to 240 mrad. The results are compared with predictions of several hadron production models. The K 0 S mean multiplicity in production processes n K 0 S and the inclusive cross section for K 0 S production σ K 0 S were measured and amount to 0.127 ± 0.005 (stat) ± 0.022 (sys) and 29.0 ± 1.6 (stat) ± 5.0 (sys) mb, respectively.

Measurements of $${\Xi }{^-} $$ and $$\overline{\Xi }{^+} $$ production in proton–proton interactions at $$\sqrt{s_{NN}}$$ = 17.3 $$\hbox {Ge}\hbox {V}$$ in the NA61/SHINE experiment

“…A number of complex nuclear effects enter here which are difficult to control quantitatively. This is why NA61/SHINE has embarked upon a systematic study of hyperon production in an experimental programme which covers hadron-proton, hadron-nucleus, and nucleusnucleus collisions [2][3][4][5]. These fixed target measurements employ the same detector and beam momenta from 13 to 158 GeV/c per nucleon.…”

Improved constraints on neutrino mixing from the T2K experiment with $\mathbf{3.13\times10^{21}}$ protons on target

“…This includes measurements of the collisions of 30 GeV protons with graphite. Data from the NA61/SHINE [37][38][39][40] experiment are then used to tune the secondary particles produced from the target. Finally, the INGRID [41] on-axis near detector is used to monitor the neutrino beam direction.…”

“…Figure 1 shows the predicted neutrino fluxes at SK for both the FHC and RHC modes. Previous T2K flux estimates [30] used thin target hadron production data collected in the NA61/SHINE experiment in 2007 [37][38][39], where a 31 GeV proton beam impinged upon a graphite target with a thickness of 4% of a nuclear interaction length (the so-called thin target). The work presented here uses an updated flux prediction based on higher statistics thin target hadron production data collected in the NA61/SHINE experiment in 2009 [40], including the yields of π + , π − , K + , K − , K 0 s , Λ and p. Future analyses will include NA61/SHINE hadron production measurements on a replica of the T2K neutrino production target.…”

Measurements of $$\pi ^\pm $$ π ± , $$K^\pm $$ K ± and proton double differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

“…The NA61/SHINE experiment took data for T2K in 2007, 2009and 2010. In 2007and 2009, measurements were performed with a 30.92 GeV/c proton beam and a 2-cm-thick carbon target (4% of a nuclear interaction length, λ i ) to measure hadron multiplicities (π ± , K ± , p, K 0 s , Λ) and the production cross section [5][6][7][8]. Production events represent the fraction of inelastic events in which at least one new hadron in the final state is produced.…”