Abstract We present measurements of $$\rho ^0$$ ρ 0 , $$\omega $$ ω and K $$^{*0}$$ ∗ 0 spectra in $$\pi ^{-} + $$ π - + C production interactions at 158 $$\text{ GeV }{/}\text{ c }$$ GeV / c and ...$$\rho ^0$$ ρ 0 spectra at 350 $$\text{ GeV }{/}\text{ c }$$ GeV / c using the NA61/SHINE spectrometer at the CERN SPS. Spectra are presented as a function of the Feynman’s variable $$x_\text {F}$$ x F in the range $$0< x_\text {F} < 1$$ 0 < x F < 1 and $$0< x_\text {F} < 0.5$$ 0 < x F < 0.5 for 158 and 350 $$\text{ GeV }{/}\text{ c }$$ GeV / 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.
Abstract Measurements of inclusive spectra and mean multiplicities of $$\pi ^\pm $$ π± , K$$^\pm $$ ± , p and $${\bar{\text {p}}}$$ p¯ produced in inelastic p + p interactions at incident projectile ...momenta of 20, 31, 40, 80 and 158 $$\text{ GeV }/c$$ GeV/c ($$\sqrt{s} = $$ s= 6.3, 7.7, 8.8, 12.3 and 17.3 $$\text{ GeV }$$ GeV , respectively) were performed at the CERN Super Proton Synchrotron using the large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function of rapidity and transverse momentum and are compared to predictions of current models. The measurements serve as the baseline in the NA61/SHINE study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter.
We have developed a new focusing system for conventional neutrino beams. The “Hadron Hose” is a wire located in the meson decay volume, downstream of the target and focusing horns. The wire is pulsed ...with high current to provide a toroidal magnetic field which continuously focuses mesons. The hose increases the neutrino event rate and reduces differences between near- and far-field neutrino spectra for oscillation experiments. We have studied this device as part of the development of the Neutrinos at the Main Injector project, but it might also be of use for other conventional neutrino beams.
Measurements of inclusive spectra and mean multiplicities of $\pi ^\pm $ , K$^\pm $ , p and ${\bar{\text {p}}}$ produced in inelastic p + p interactions at incident projectile momenta of 20, 31, 40, ...80 and 158 $\text{ GeV }/c$ ( $\sqrt{s} = $ 6.3, 7.7, 8.8, 12.3 and 17.3 $\text{ GeV }$ , respectively) were performed at the CERN Super Proton Synchrotron using the large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function of rapidity and transverse momentum and are compared to predictions of current models. The measurements serve as the baseline in the NA61/SHINE study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter.
This letter reports results from a search for {nu}{sub {mu}} {yields} {nu}{sub e} transitions by the MINOS experiment based on a 7 x 10{sup 20} protons-on-target exposure. Our observation of 54 ...candidate {nu}{sub e} events in the Far Detector with a background of 49.1 {+-} 7.0(stat.) {+-} 2.7(syst.) events predicted by the measurements in the Near Detector requires 2 sin{sup 2}(2{theta}{sub 13}) sin{sup 2}{theta}{sub 23} < 0.12 (0.20) at the 90% C.L. for the normal (inverted) mass hierarchy at {delta}{sub CP} = 0. The experiment sets the tightest limits to date on the value of {theta}{sub 13} for nearly all values of {delta}{sub CP} for the normal neutrino mass hierarchy and maximal sin{sup 2}(2{theta}{sub 23}).
Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on the observation of neutral-current neutrino interactions, from an ...exposure to the NuMI neutrino beam of 7.07x10{sup 20} protons on target. A total of 802 neutral-current event candidates is observed in the Far Detector, compared to an expected number of 754{+-}28(stat){+-}37(syst) for oscillations among three active flavors. The fraction f{sub s} of disappearing {nu}{sub {mu}} that may transition to {nu}{sub s} is found to be less than 22% at the 90% C.L.
► New calculation of geomagnetic effects on cosmic rays. ► New calculation of the one-dimensional moon and sun shadow. ► Hints of interplanetary magnetic field effects on cosmic rays. ► Absolute ...astrophysical pointing calibration of the MINOS far detector.
The shadowing of cosmic ray primaries by the moon and sun was observed by the MINOS far detector at a depth of 2070
mwe using 83.54 million cosmic ray muons accumulated over 1857.91 live-days. The shadow of the moon was detected at the 5.6
σ level and the shadow of the sun at the 3.8
σ level using a log-likelihood search in celestial coordinates. The moon shadow was used to quantify the absolute astrophysical pointing of the detector to be 0.17
±
0.12°. Hints of interplanetary magnetic field effects were observed in both the sun and moon shadow.
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