Search for a light Higgs resonance in radiative decays of theϒ(1S)with a charm tag

Abstract

A search is presented for the decay Υ (1S) → γA 0 , A 0 → cc, where A 0 is a candidate for the CP -odd Higgs boson of the next-to-minimal supersymmetric standard model. The search is based on data collected with the BABAR detector at the Υ (2S) resonance. A sample of Υ (1S) mesons is selected via the decay Υ (2S) → π + π − Υ (1S). The A 0 → cc decay is identified through the reconstruction of hadronic D 0 , D + , and D * (2010) + meson decays. No significant signal is observed. The measured 90% confidence-level upper limits on the product branching fraction B(Υ (1S) → γA 0 ) × B(A 0 → cc) range from 7.4 × 10 −5 to 2.4 × 10 −3 for A 0 masses from 4.00 to 8.95 GeV/c 2 and 9.10 to 9.25 GeV/c 2 , where the region between 8.95 and 9.10 GeV/c 2 is excluded because of background from Υ (2S) → γχ bJ (1P ), χ bJ (1P ) → γΥ (1S) decays.

Revisiting the production of ALPs at B-factories

“…Two main scenarios are typically considered in the literature, depending on the relative strength of the ALP coupling to SM and dark sector particles: either |c aχχ | |c aSM |, or |c aχχ | |c aSM |. In the first case, for m a values in the GeV range, the ALP would typically decay in the detector, leaving the signatures γa(→ jj) [38,39], γa(→ γγ) [40][41][42] and γa(→ ) [43][44][45], with = {e, µ, τ }. This scenario is dubbed the visible ALP.…”

“…The interplay between these production mechanisms allows to classify three complementary experimental strategies: (i) resonant searches of Υ → γa, from which one could infer bounds on c abb and c aγγ , (ii) mixed (non-)resonant searches which are sensitive to a different combination of c abb and c aγγ , and (iii) non-resonant searches which depend solely on c aγγ . Before deriving constraints on the ALP couplings from existing BaBar and Belle data, it is important to stress once again that the conclusions outlined above are general and that they apply, for instance, to searches for ALP decaying into visible particles, such as hadrons [38,39], µµ [43,44] and τ τ [45].…”

Updated collider and direct detection constraints on Dark Matter models for the Galactic Center gamma-ray excess

“…We also consider in this study constraints derived from BaBar on upsilon decays to light scalar or pseudoscalar particles, in particular focusing on channels where the mediator subsequently decays to hadrons, muons, taus or charm quarks [91][92][93][94]. We consider relativistic and QCD corrections for the decay of a vector meson as described in Ref.…”

Search for light CP-odd Higgs decay with a charm tag at BABAR

“…No analyses found a significant signal and upper limits have been obtained [5]. The A 0 decay into cc had not yet been used until the recent analysis from BABAR published this year [6].…”