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Search for production of an invisible dark photon in π0 decays (2019)

Cortina Gil, E. ; , ; Kleimenova, A. ; [et al.]

Springer

In: Journal of High Energy Physics. 2019; 2019(5): 182. Published 2019 May 01. doi: 10.1007/jhep05(2019)182.

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Publication Date: 2019-05-01

Print ISSN: 1126-6708

Electronic ISSN: 1029-8479

Topics: Physics

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Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties (2014)

Batley, J. R. ; , ; Kalmus, G. ; [et al.]

Springer

In: Journal of High Energy Physics. 2014; 2014(8): 159. Published 2014 Aug 01. doi: 10.1007/jhep08(2014)159.

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Publication Date: 2014-08-01

Print ISSN: 1126-6708

Electronic ISSN: 1029-8479

Topics: Physics

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An investigation of the very rare $$ {K}^{+}o {pi}^{+} u overline{ u} $$ decay (2020)

Cortina Gil, E. ; , ; Kleimenova, A. ; [et al.]

Springer

In: Journal of High Energy Physics. 2020; 2020(11): 42. Published 2020 Nov 01. doi: 10.1007/jhep11(2020)042.

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Publication Date: 2020-11-01

Description: The NA62 experiment reports an investigation of the $$ {K}^{+}o {pi}^{+} u overline{ u} $$ K + → π + ν ν ¯ mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the $$ {K}^{+}o {pi}^{+} u overline{ u} $$ K + → π + ν ν ¯ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of ($$ {0.48}_{-0.48}^{+0.72} $$ 0.48 − 0.48 + 0.72 ) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

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Topics: Physics

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Search for π0 decays to invisible particles (2021)

Cortina Gil, E. ; , ; Kleimenova, A. ; [et al.]

Springer

In: Journal of High Energy Physics. 2021; 2021(2): 201. Published 2021 Feb 01. doi: 10.1007/jhep02(2021)201.

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Publication Date: 2021-02-01

Description: The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 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/c2 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.

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Topics: Physics

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Search for a feebly interacting particle X in the decay K+ → π+X (2021)

Cortina Gil, E. ; , ; Kleimenova, A. ; [et al.]

Springer

In: Journal of High Energy Physics. 2021; 2021(3): 58. Published 2021 Mar 01. doi: 10.1007/jhep03(2021)058.

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Publication Date: 2021-03-01

Description: A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ → $$ {pi}^{+} u overline{ u} $$ π + ν ν ¯ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c2 and 154–260 MeV/c2, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K+ → π+X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.

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Measurement of the form factors of charged kaon semileptonic decays (2018)

, ; Batley, J. R. ; Kalmus, G. ; [et al.]

Springer

In: Journal of High Energy Physics. 2018; 2018(10): 150. Published 2018 Oct 01. doi: 10.1007/jhep10(2018)150.

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Publication Date: 2018-10-01

Description: A measurement of the form factors of charged kaon semileptonic decays is presented, based on 4.4 × 106 K ± → π 0 e ± ν e (K e3 ± ) and 2.3 × 106 K ± → π 0 μ±ν μ (K μ3 ± ) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the K e3 ± and K μ3 ± modes is also presented.

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Measurement of the very rare K+ → $$ {pi}^{+} u overline{ u} $$ decay (2021)

, ; Cortina Gil, E. ; Kleimenova, A. ; [et al.]

Springer

In: Journal of High Energy Physics. 2021; 2021(6): 93. Published 2021 Jun 01. doi: 10.1007/jhep06(2021)093.

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Publication Date: 2021-06-01

Description: The NA62 experiment reports the branching ratio measurement $$ mathrm{BR}left({K}^{+}o {pi}^{+} u overline{ u} ight)=left({10.6}_{-3.4}^{+4.0}left|{}_{mathrm{stat}} ight.pm {0.9}_{mathrm{syst}} ight)imes {10}^{-11} $$ 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+→$$ {pi}^{+} u overline{ u} $$ π + ν ν ¯ decay, observed with a significance of 3.4σ. 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.

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Topics: Physics

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