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Journal Article
Search for sub-GeV scalars in e+e- collisions
2025
Overview
Light scalars that couple to leptons are common figures in beyond the Standard Model endeavors. Considering a scalar that has universal and couplings to leptons only, we compute this leptophilic scalar contribution to the
e
-
e
+
→
τ
+
τ
-
S
production cross section with
S
→
e
+
e
-
(
μ
+
μ
-
)
. We later compare the expected signal with recent data from the BELLE collaboration collected near the resonance
Υ
(
4
S
)
with
L
=
626
f
b
-
1
of integrated luminosity to place limits on the couplings-mass plane for the 4 MeV-6.5 GeV mass range. We then extended this analysis to a more general one
e
-
e
+
→
ℓ
+
ℓ
-
S
production cross section where
ℓ
=
e
,
μ
,
τ
with
S
→
e
+
e
-
(
μ
+
μ
-
)
, showing that BELLE constitutes an excellent laboratory for light scalars, where can be derived constraints stronger than those derived stemming from the g-2 of the electron or muon.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
