Abstract
We assess the impact of searches at flavor factories for new neutral resonances that couple to both photons and gluons. These are well motivated by “heavy axion” solutions of the strong CP problem and by frameworks addressing both Dark Matter and the Higgs hierarchy problem. We use LHCb public diphoton data around the Bs mass to derive the current best limit on these resonances for masses between 4.9 and 6.3 GeV. We estimate that a future LHCb dedicated search would test an axion decay constant of O(TeV) for axion masses in the few-to-tens of GeV, being fully complementary to the low mass ATLAS and CMS searches. We also derive the impact of BABAR searches based on ϒ decays and the future Belle-II reach.
Highlights
One has MNP = g∗f with g∗ being the typical size of the couplings in the NP sector, so that probing weak enough couplings of the pNGB gives an indirect probe of the scale of new physics
As a way to overcome this issue, we show that the large production rate in pp collisions induced by the non-zero gluon coupling can be exploited at LHCb, which already has a low mass diphoton trigger designed to look for the rare decay Bs → γγ
Integrating out the new physics sector at the scale MNP, we write down the effective interactions between the pNGBs and the SM
Summary
We consider a spontaneously broken approximate U(1) symmetry in the UV. Integrating out the new physics sector at the scale MNP, we write down the effective interactions between the pNGBs and the SM. The lower invariant mass reach of these ATLAS searches is set by the diphoton isolation requirement of [58], ∆Rγγ = 0.15 This corresponds to an ALP mass of 4 GeV as discussed in ref. In figure 2 we fix the ALP masses to two representative values ma = 5, 15 GeV and show the impact of the various searches in the plane (N/f, E/f ) which control the ALP’s gluon and photon coupling respectively. The ATLAS, CMS and LHCb limits and sensitivites shown in figure 2 are derived assuming gluon fusion as the ALP production process, so they sharply stop at a given small gluon coupling. The bottom right corner where the new resonance mostly couples to gluons is challenging to constrain in this mass range, even though boosted dijet searches at the LHC were recently able to go down to invariant masses of 50 GeV For N/f (100GeV)−1 one expects color states generating the ALP coupling to be within the reach of the LHC
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