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Title: Searches for lepton number violation and resonances in K ± → πμμ decays

The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003$-$2004. A new upper limit on the rate of the lepton number violating decay $$K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm}$$ is reported: $$\mathcal{B}(K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm})<8.6 \times 10^{-11}$$ at 90% CL. Searches for two-body resonances $X$ in $$K^{\pm}\to\pi\mu\mu$$ decays (such as heavy neutral leptons $$N_4$$ and inflatons $$\chi$$) are also presented. Finally, in the absence of signals, upper limits are set on the products of branching fractions $$\mathcal{B}(K^{\pm}\to\mu^{\pm}N_4)\mathcal{B}(N_4\to\pi\mu)$$ and $$\mathcal{B}(K^{\pm}\to\pi^{\pm}X)\mathcal{B}(X\to\mu^+\mu^-)$$ for ranges of assumed resonance masses and lifetimes. The limits are in the $$(10^{-11},10^{-9})$$ range for resonance lifetimes below 100 ps.
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Publication Date:
Report Number(s):
FERMILAB-PUB-16-700-TD; CERN-EP-2016-310
Journal ID: ISSN 0370-2693; 1503402
Grant/Contract Number:
AC02-07CH11359; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 769; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
The NA48/2 collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1367908
Alternate Identifier(s):
OSTI ID: 1369395