First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay

Batley, John Richard; Kalmus, George; Lazzeroni, Cristina; Munday, David John; Slater, Mark W.; Wotton, Stephen A.; Arcidiacono, Roberta; Bocquet, Ginette; Cabibbo, Nicola; Ceccucci, Augusto

doi:10.1007/JHEP03(2024)137

First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay

NA48/2

Collaboration

•

John Richard Batley
(
- Cambridge U. (main)
)

Oct 31, 2023

16 pages

Published in:

JHEP 03 (2024) 137

Published: Mar 22, 2024

e-Print:

2310.20295 [hep-ex]

DOI:

10.1007/JHEP03(2024)137

Report number:

CERN-EP-2023-245

Experiments:

CERN-NA-048-2

View in:

links

reference search2 citations

Citations per year

Abstract: (Springer)

The NA48/2 experiment at CERN reports the first observation of the K

^{±}

→ π

^{0}

π

^{0}

μ

^{±}

ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV

^{2}

/c

^{4}

is measured to be (0.65 ± 0.03) × 10

^{−6}

. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10

^{−6}

, in agreement with chiral perturbation theory predictions.

Note:

16 pages, 9 figures

Branching fraction
Fixed Target Experiments
Rare Decay
K: secondary beam
dilepton: mass spectrum
perturbation theory: chiral
K: branching ratio: measured
K: semileptonic decay
kinematics
NA48

References(18)

Figures(9)

[1]

Phenomenological Lagrangians

Steven Weinberg
(
- Harvard U. and
- Harvard-Smithsonian Ctr. Astrophys.
)

- Physica A 96 (1979) 1-2, 327-340
•
DOI:
- 10.1016/0378-4371(79)90223-1

K(l4) decays beyond one loop

J. Bijnens
(
- Nordita
)
,
G. Colangelo
(
- Bern U. and
- Rome U., Tor Vergata
)
,
J. Gasser
(
- Bern U.
)

- Nucl.Phys.B 427 (1994) 427-454
•
e-Print:
- hep-ph/9403390
•
DOI:
- 10.1016/0550-3213(94)90634-3

Precise tests of low energy QCD from K(e4)decay properties

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

et al.

- Eur.Phys.J.C 70 (2010) 635-657
•
DOI:
- 10.1140/epjc/s10052-010-1480-6

New measurement of the charged kaon semileptonic $K^\pm \to \pi^+\pi^- e^\pm\nu$ ( $K_e4$ ) decay Branching Ratio and Hadronic Form Factors

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

et al.

- Phys.Lett.B 715 (2012) 105-115,
- Phys.Lett.B 740 (2015) 364-364 (addendum)
•
e-Print:
- 1206.7065
•
DOI:
- 10.1016/j.physletb.2012.07.048

Detailed study of the $\mathrm{K^{\pm}} \rightarrow \pi^{0} \pi^{0} \mathrm{e^{\pm}} \nu$ ( $\mathrm{K}_{\mathrm{e}4}^{00}$ ) decay properties

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

et al.

- JHEP 08 (2014) 159
•
e-Print:
- 1406.4749
•
DOI:
- 10.1007/JHEP08(2014)159

On some aspects of isospin breaking in the decay $K^\pm$ $\to$ $\pi^0 \pi^0 e^\pm$ $\stackrel{_{(-)}}{\nu_e}$

Véronique Bernard
(
- Orsay, IPN
)
,
Sébastien Descotes-Genon
(
- Orsay, LPT
)
,
Marc Knecht
(
- Marseille, CPT
)

- Eur.Phys.J.C 75 (2015) 4, 145
•
e-Print:
- 1501.07102
•
DOI:
- 10.1140/epjc/s10052-015-3359-z

[7]

A dispersive treatment of $K_{\ell 4}$ decays

Gilberto Colangelo
(
- U. Bern, AEC and
- Bern U.
)
,
Emilie Passemar
(
- Indiana U., Bloomington (main) and
- Jefferson Lab
)
,
Peter Stoffer
(
- U. Bern, AEC and
- Bern U. and
- Bonn U., HISKP and
- Bonn U.
)

- Eur.Phys.J.C 75 (2015) 172
•
e-Print:
- 1501.05627
•
DOI:
- 10.1140/epjc/s10052-015-3357-1

[8]

K+ Rare Decay Modes

- Phys.Lett.B 25 (1967) 572-573
•
DOI:
- 10.1016/0370-2693(67)90150-5

Angular Correlations in Ke-4 Decays and Determination of Low-Energy pi-pi Phase Shifts

Nicola Cabibbo
(
- UC, Berkeley
)
,
Alexander Maksymowicz
(
- UC, Berkeley
)

- Phys.Rev. 137 (1965) B438-B443,
- Phys.Rev. 168 (1968) 1926 (erratum)
•
DOI:
- 10.1103/PhysRev.137.B438

Search for direct CP violating charge asymmetries in K+- ---> pi+- pi+ pi- and K+- ---> pi+- pi0 pi0 decays

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

et al.

- Eur.Phys.J.C 52 (2007) 875-891
•
e-Print:
- 0707.0697
•
DOI:
- 10.1140/epjc/s10052-007-0456-7

[11]

KABES: A novel beam spectrometer for NA48

B. Peyaud
(
- DAPNIA, Saclay
)

- Nucl.Instrum.Meth.A 535 (2004) 247-252
•
DOI:
- 10.1016/j.nima.2004.07.275

MICROMEGAS: A High granularity position sensitive gaseous detector for high particle flux environments

Y. Giomataris
(
- DAPNIA, Saclay
)
,
P. Rebourgeard
(
- DAPNIA, Saclay
)
,
J.P. Robert
(
- DAPNIA, Saclay
)
,
Georges Charpak
(
- ESPCI, Paris and
- CERN
)

- Nucl.Instrum.Meth.A 376 (1996) 29-35
•
DOI:
- 10.1016/0168-9002(96)00175-1

The Beam and detector for the NA48 neutral kaon CP violations experiment at CERN

NA48

Collaboration

•

V. Fanti

et al.

- Nucl.Instrum.Meth.A 574 (2007) 433-471
•
DOI:
- 10.1016/j.nima.2007.01.178

GEANT Detector Description and Simulation Tool

et al.

DOI:
- 10.17181/CERN.MUHF.DMJ1

Review of Particle Physics

R.L. Workman
(
- George Washington U.
)
,
V.D. Burkert
(
- Jefferson Lab
)
,
V. Crede
(
- Florida State U.
)
,
E. Klempt
(
- Bonn U., HISKP
)
,
U. Thoma
(
- Bonn U., HISKP
)

et al.

- PTEP 2022 (2022) 083C01
•
DOI:
- 10.1093/ptep/ptac097

Determination of the S-wave pi pi scattering lengths from a study of K+- ---> pi+- pi0 pi0 decays

J.R. Batley
(
- Cambridge U.
)
,
A.J. Culling
(
- Cambridge U.
)
,
G. Kalmus
(
- Cambridge U.
)
,
C. Lazzeroni
(
- Cambridge U. and
- Birmingham U.
)
,
D.J. Munday
(
- Cambridge U.
)

et al.

- Eur.Phys.J.C 64 (2009) 589-608
•
e-Print:
- 0912.2165
•
DOI:
- 10.1140/epjc/s10052-009-1171-3

Empirical parameterization of the K+- -> pi+- pi0 pi0 decay Dalitz plot

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

et al.

- Phys.Lett.B 686 (2010) 101-108
•
e-Print:
- 1004.1005
•
DOI:
- 10.1016/j.physletb.2010.02.036

Experimental Study of 30,000 K(e4) Decays

et al.

- Phys.Rev.D 15 (1977) 574
•
DOI:
- 10.1103/PhysRevD.15.574

First observation and study of the K±→π0π0μ±νK^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nuK±→π0π0μ±ν decay

Citations per year

First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay