TY - JOUR
T1 - Search for a feebly interacting particle X in the decay K+ → π+X
AU - NA62 Collaboration
AU - Goudzovski, Evgueni
PY - 2021/3/4
Y1 - 2021/3/4
N2 - A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the Kpinn 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.
AB - A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the Kpinn 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.
U2 - 10.1007/JHEP03(2021)058
DO - 10.1007/JHEP03(2021)058
M3 - Article
VL - 2021
JO - JHEP
JF - JHEP
SN - 1126-6708
M1 - 58
ER -