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

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arxiv 1811.08508 v2 pith:7VRYDXBA submitted 2018-11-20 hep-ex

classification hep-ex
keywords rightarrowdecay-in-flighteventsfirstsearchtechniquetimesbackground
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The NA62 experiment at the CERN SPS reports the first search for $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ using the decay-in-flight technique, based on a sample of $1.21\times10^{11}$ $K^+$ decays collected in 2016. The single event sensitivity is $3.15\times 10^{-10}$, 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 $14 \times 10^{-10}$ on the $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ branching ratio at 95\% CL.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Observation of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay and measurement of its branching ratio

    hep-ex 2024-12 conditional novelty 6.0 of 10

    NA62 observes K+ -> pi+ nu nu-bar with 5 sigma significance and measures B = (13.0+3.3-3.0) x 10^-11, the smallest branching ratio measured above 5 sigma.

  2. The Dark Photon

    hep-ph 2020-05 unverdicted novelty 2.0 of 10

    The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-...

  3. Constraints on New Physics from $B$ mesons

    hep-ph 2019-08 unverdicted

    A 2019 review of B meson and kaon physics anomalies, summarizing the evidence for lepton flavor universality violation and tensions in mixing and CP violation, and assessing new physics explanations.

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