Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in ...2009. An efficient use of the long-target measurements for neutrino flux predictions in T2K requires dedicated reconstruction and analysis techniques. Fully-corrected differential yields of
π
±
-mesons from the surface of the T2K replica target for incoming 31 GeV/
c
protons are presented. A possible strategy to implement these results into the T2K neutrino beam predictions is discussed and the propagation of the uncertainties of these results to the final neutrino flux is performed.
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This paper presents measurements of production cross sections and inelastic cross sections for the following reactions: 60 GeV/c protons with C, Be, Al targets and 120 GeV/c protons with C and Be ...targets. The analysis is performed using the NA61/SHINE spectrometer at the CERN Super Proton Synchrotron. First measurements are obtained using protons at 120 GeV/c, while the results for protons at 60 GeV/c are compared with previously published measurements. These interaction cross section measurements are critical inputs for neutrino flux prediction in current and future accelerator-based long-baseline neutrino experiments.
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Results on
ϕ
meson production in inelastic
p
+
p
collisions at CERN SPS energies are presented. They are derived from data collected by the NA61/SHINE fixed target experiment, by means of invariant ...mass spectra fits in the
ϕ
→
K
+
K
-
decay channel. They include the first ever measured double differential spectra of
ϕ
mesons as a function of rapidity
y
and transverse momentum
p
T
for proton beam momenta of
80
GeV
/
c
and
158
GeV
/
c
, as well as single differential spectra of
y
or
p
T
for beam momentum of
40
GeV
/
c
. The corresponding total
ϕ
yields per inelastic
p
+
p
event are obtained. These results are compared with existing data on
ϕ
meson production in
p
+
p
collisions. The comparison shows consistency but superior accuracy of the present measurements. The emission of
ϕ
mesons in
p
+
p
reactions is confronted with that occurring in
Pb
+
Pb
collisions, and the experimental results are compared with model predictions. It appears that none of the considered models can properly describe all the experimental observations.
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Precise knowledge of hadron production rates in the generation of neutrino beams is necessary for accelerator-based neutrino experiments to achieve their physics goals. NA61/SHINE, a large-acceptance ...hadron spectrometer, has recorded hadron+nucleus interactions relevant to ongoing and future long-baseline neutrino experiments at Fermi National Accelerator Laboratory. This paper presents three analyses of interactions of 60 GeV/c π+ with thin, fixed carbon and beryllium targets. Integrated production and inelastic cross sections were measured for both of these reactions. In an analysis of strange, neutral hadron production, differential production multiplicities of KS0, Λ and Λ¯ were measured. Lastly, in an analysis of charged hadron production, differential production multiplicities of π+, π−, K+, K− and protons were measured. These measurements will enable long-baseline neutrino experiments to better constrain predictions of their neutrino flux in order to achieve better precision on their neutrino cross section and oscillation measurements.
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We present measurements of
ρ
0
,
ω
and K
∗
0
spectra in
π
-
+
C production interactions at 158
GeV
/
c
and
ρ
0
spectra at 350
GeV
/
c
using the NA61/SHINE spectrometer at the CERN SPS. Spectra are ...presented as a function of the Feynman’s variable
x
F
in the range
0
<
x
F
<
1
and
0
<
x
F
<
0.5
for 158 and 350
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.
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Pentaquark states have been extensively investigated theoretically in the context of the constituent quark model. In this paper results of an experimental search for pentaquarks in the Ξ−π−, Ξ−π+, ...¯Ξ+π− and ¯ Ξ+π+ invariant mass spectra in proton-proton interactions at √s = 17.3 GeV are presented. Previous possible evidence from the NA49 collaboration of the existence of a narrow Ξ−π− baryon resonance in p + p interactions is not confirmed with almost 10 times greater event statistics. The search was performed using the NA61/SHINE detector which reuses the main components of the NA49 apparatus. No signal was observed with either the selection cuts of NA49 or newly optimized cuts.
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