First search for $K^+\rightarrow\pi^+\nu\bar{\nu}$ using the decay-in-flight technique - INSPIRE

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First search for $K^+\rightarrow\pi^+\nu\bar{\nu}$ using the decay-in-flight technique

NA62

Collaboration

•

Eduardo Cortina Gil
(
- Louvain U., CP3 and
- Louvain U.
)

Nov 20, 2018

11 pages

Published in:

Phys.Lett.B 791 (2019) 156-166

Published: Apr 10, 2019

e-Print:

1811.08508 [hep-ex]

DOI:

10.1016/j.physletb.2019.01.067 (publication)

PDG:

{{\mathit K}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \nu}}{{\overline{\mathit \nu}}}

Report number:

CERN-EP-2018-314

Experiments:

CERN-NA-062

View in:

reference search125 citations

Citations per year

Abstract: (Elsevier)

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 1.21×1011 K+ 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.

Note:

18 pages, 13 figures

K+: secondary beam
K+: semileptonic decay
neutrino: pair production
K+: branching ratio
branching ratio: upper limit
sensitivity
background
CERN SPS
NA62
measurement methods

References(25)

Figures(13)

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