A study of the K+→ π0e+νγ decay Cortina Gil, E.; Minucci, E.; Petrov, P. ...
The journal of high energy physics,
7/9, Letnik:
2023, Številka:
9
Journal Article
Recenzirano
Odprti dostop
A
bstract
A sample of 1
.
3 × 10
5
K
+
→
π
0
e
+
νγ
candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are ...obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.
The NA62 experiment at CERN SPS aims to increase the precision in the measure of the Branching Ratio of the K + → π + vv̅ decay. Efficient veto systems are needed to achieve the required background ...suppression level. The LKr, covering the angular range 1-10 mrad, is part of system vetoing photons due to π 0 decay (from K + → π + π 0 ). This paper deals with the implementation of the LKr L0 trigger peak reconstruction algorithm on FPGA by using a mixed architecture based on soft core embedded processors together with custom VHDL modules. This solution allows an efficient and flexible reconstruction of the energy-deposition peak.
The real-time estimation of the distance of objects from an observer is a critical issue in several application fields. A new cellular neural network circuit that uses a stereo vision algorithm to ...compute the disparity map is presented.
Measurement of the very rare K+→π+νν¯ decay Cortina Gil, E.; Minucci, E.; Padolski, S. ...
The journal of high energy physics,
15/6, Letnik:
2021, Številka:
6
Journal Article
Recenzirano
Odprti dostop
A
bstract
The NA62 experiment reports the branching ratio measurement
BR
K
+
→
π
+
ν
ν
¯
=
10.6
−
3.4
+
4.0
stat
±
0.9
syst
×
10
−
11
at 68% CL, based on the observation of 20 signal candidates with ...an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare
K
+
→
π
+
ν
ν
¯
decay, observed with a significance of 3.4
σ
. The experiment achieves a single event sensitivity of (0
.
839
±
0
.
054)
×
10
−
11
, corresponding to 10.0 events assuming the Standard Model branching ratio of (8
.
4
±
1
.
0)
×
10
−
11
. This measurement is also used to set limits on BR(
K
+
→ π
+
X
), where
X
is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.
Search for π0 decays to invisible particles Cortina Gil, E.; Minucci, E.; Padolski, S. ...
The journal of high energy physics,
02/2021, Letnik:
2021, Številka:
2
Journal Article
Recenzirano
Odprti dostop
A
bstract
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 10
9
tagged
π
0
mesons from
K
+
→
π
+
π
0
(
γ
), searching for the decay of the
π
0
to invisible particles. No signal ...is observed in excess of the expected background fluctuations. An upper limit of 4
.
4 × 10
−
9
is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay
K
+
→
π
+
X
, where
X
is a particle escaping detection with mass in the range 0.110–0.155 GeV
/c
2
and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming
X
to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.
The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011K+ decays collected in 2016. The single event sensitivity ...is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10−10 on the K+→π+νν¯ branching ratio at 95% CL.
A study of the K + → π 0 e + νγ decay The NA62 collaboration; A. Kleimenova; S. Padolski ...
The journal of high energy physics,
09/2023, Letnik:
2023, Številka:
9
Journal Article
Recenzirano
Odprti dostop
Abstract A sample of 1.3 × 105 K + → π 0 e + νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained ...at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.
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