We present measurements of ρ0, ω and K∗0 spectra in π-+ C production interactions at 158 GeV/c and ρ0 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 xF in the range 0<xF<1 and 0<xF<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.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) the onset of deconfinement in hadronic matter by the measurement of particle production in collisions of nuclei with ...various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra and mean multiplicities of π- mesons produced in the 5% most central7Be + 9Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150AGeV/c obtained by the so-called h- method which does not require any particle identification. The shape of the transverse mass spectra differs from the shapes measured in central Pb + Pb collisions and inelastic p+p interactions. The normalized width of the rapidity distribution decreases with increasing collision energy and is in between the results for inelastic nucleon–nucleon and central Pb + Pb collisions. The mean multiplicity of pions per wounded nucleon in central7Be + 9Be collisions is close to that in central Pb + Pb collisions up to 75AGeV/c. However, at the top SPS energy the result lies between those for nucleon–nucleon and Pb + Pb interactions. The results are discussed in the context of predictions for the onset of deconfinement at the CERN SPS collision energies.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Double-differential yields of
Ξ
1530
0
and
Ξ
¯
1530
0
resonances produced in
p+p
interactions were measured at a laboratory beam momentum of 158
GeV
/
c
. This measurement is the first of its kind ...in
p+p
interactions below LHC energies. It was performed at the CERN SPS by the NA61/SHINE collaboration. Double-differential distributions in rapidity and transverse momentum were obtained from a sample of
26
×
10
6
inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of
Ξ
1530
0
(
6.73
±
0.25
±
0.67
)
×
10
-
4
and
Ξ
¯
1530
0
(
2.71
±
0.18
±
0.18
)
×
10
-
4
. The rapidity and transverse momentum spectra and mean multiplicities were compared to predictions of string-hadronic and statistical model calculations.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Heavy-ion collisions at NICA energies provide a unique opportunity for the study of the production of hypernuclei in dense baryonic matter. In this paper, the details of the reconstruction procedure ...for hypertritons with the MPD detector in Bi + Bi collisions at NICA energies are presented.
The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at ...a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of
π
±
,
K
±
,
p
and
p
¯
produced in the 20% most
central
7
Be+
9
Be collisions at beam momenta of 19
A
, 30
A
, 40
A
, 75
A
and 150
A
Ge
V
/
c
. The energy dependence of the
K
±
/
π
±
ratios as well as of inverse slope parameters of the
K
±
transverse mass distributions are close to those found in inelastic
p+p
reactions. The new results are compared to the world data on
p+p
and Pb+Pb collisions as well as to predictions of the
Epos
,
U
r
qmd
,
Ampt
,
Phsd
and
Smash
models.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A measurement of charged hadron pair correlations in two-dimensional
Δ
η
Δ
ϕ
space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE ...detector at the CERN SPS for incident beam momenta of 19
A
, 30
A
, 40
A
, 75
A
, and 150
A
Ge
/
c
. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The
C
(
Δ
η
,
Δ
ϕ
)
correlation functions were compared with results from a similar analysis on p + p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be + Be collisions and p + p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the
Epos
and UrQMD models are compared to the measurements. Evolution of an enhancement around
(
Δ
η
,
Δ
ϕ
)
=
(
0
,
0
)
with incident energy is observed in central Be + Be collisions. It is not predicted by both models and almost non-existing in proton–proton collisions at the same momentum per nucleon.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The measurement of
K
∗
(
892
)
0
resonance production via its
K
+
π
-
decay mode in inelastic p+p collisions at beam momentum 158
Ge
V
/
c
(
s
NN
=
17.3
Ge
V
) is presented. The data were recorded ...by the NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The
template
method was used to extract the
K
∗
(
892
)
0
signal and double-differential transverse momentum and rapidity spectra were obtained. The full phase-space mean multiplicity of
K
∗
(
892
)
0
mesons was found to be
(
78.44
±
0.38
(
stat
)
±
6.0
(
sys
)
)
·
10
-
3
. The NA61/SHINEresults are compared with the
Epos1.99
and Hadron Resonance Gas models as well as with world data from p+p and nucleus–nucleus collisions.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
We present a measurement of the momentum spectra of π±, K±, p±, Λ, ¯Λ, and K0S produced in interactions of negatively charged pions with carbon nuclei at beam momenta of 158 and 350 GeV/c. The total ...production cross sections are measured as well. The data were collected with the large-acceptance spectrometer of the fixed target experiment NA61/SHINE at the CERN SPS. The obtained double-differential p−pT spectra provide a unique reference dataset with unprecedented precision and large phase-space coverage to tune models used for the simulation of particle production in extensive air showers in which pions are the most numerous projectiles.
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