Accumulating Evidence for the Associate Production of a Neutral Scalar with Mass around 151 GeV

Abstract

In recent years, hints for "multi-lepton anomalies" have been accumulated by the analysis of Large Hadron Collider (LHC) data, pointing towards the existence of beyond the Standard Model (SM) Higgs bosons: a new scalar particle S with a mass mS in the range between 130 GeV and 160 GeV, produced from the decay of a heavier new scalar particle, H. Motivated by this observation, we perform a search for the signatures of S within this mass region, which has been studied by CMS and ATLAS as a by-product of the SM Higgs searches in the side-bands of the kinematic regions. Combining the γγ and Zγ channels, with associated leptons, di-jets, bottom quarks and missing energy, we obtain a local (global) significance of 5.1σ (4.8σ) for a mass of mS = 151.5 GeV and provide the preferred ranges for the corresponding (fiducial) cross sections. This is a strong indication for a scalar resonance S decaying into photons, and, to a lesser extent to Zγ, in association with missing energy, jets or leptons. Hints for the decays into, or production in association with, bottom quarks are statistically less significant. In order to test this hypothesis, we propose a search for H → γγbb, τ + τ − bb in asymmetric configurations that has not yet been performed by ATLAS and CMS.

Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays

“…In the pion case (P = π ± ), one usually defines the ratio to be fully photon-inclusive such that it is infrared safe. As a consequence, one has to include in R P e/µ terms arising from the structure dependent contribution to π → ν γ [51], that are formally of O(e 2 Q 4 ), but are not helicity suppressed and behave as ∆ P e 2 Q 4 ∼ (α/π) (m P /Λ χ ) 4 (m P /m e ) 2 . Finally, at the level of uncertainty considered, one needs to include higher order corrections in α, namely ∆ P e 4 Q 0 .…”

“…1 In particular, the measurements of the ratios of branching ratios (Br) R(D ( * ) )=Br[B → D ( * ) τ ν τ ]/Br[B → D ( * ) ν ] [4][5][6] , where = µ, e, and R(K ( * ) )=Br[B → K ( * ) µ + µ − ]/Br[B → K ( * ) e + e − ] [ [7][8][9] deviate from the SM expectation by more than 3σ [10][11][12][13][14] and 4σ [15][16][17][18], respectively. 2 In addition, anomalous magnetic moments (g − 2) ( = e, µ, τ ) of charged leptons are intrinsically related to LFU violation as they are chirality flipping quantities. Here, there is the long-standing discrepancy in (g − 2) µ of 4.2σ [20][21][22] which can be considered as a hint of LFU violation (LFUV), since, if compared to (g − 2) e , the bound from the latter on flavor blind new physics (NP) is much more stringent.…”

Probing dark matter in 2HDMS+S with MeerKAT Galaxy Cluster Legacy Survey data

“…Statistically compelling excesses in various final states ( opposite and same sign di-leptons, and the three lepton channel with and without the presence of b-tagged jets) have been reported in references [12] [13] [14]. In addition evidence for the production of the scalar S with mass 151 GeV was obtained by combining side band data from SM Higgs searches [15]. When all decay channels are included a global significance of 4.8 σ was reported for the required mass range (130 -160 GeV) to explain the anomalies [15].…”

“…In addition evidence for the production of the scalar S with mass 151 GeV was obtained by combining side band data from SM Higgs searches [15]. When all decay channels are included a global significance of 4.8 σ was reported for the required mass range (130 -160 GeV) to explain the anomalies [15]. The scalar S can potentially act as a mediator between SM particles and the dark matter candidate introduced within the hidden sector of the model.…”

Heavy Higgs bosons at a 100 TeV hadron collider

“…In experiment, many searches for heavy neutral Higgs have been carried out in τ + τ − [32,33], t t, b b, µ + µ − , ZZ, W W , hh, hV channels, which are reviewed in [34,35]. And recently evidence for a new scalar around 151 GeV was accumulated with significances of 5.1σ local and 4.8σ global [36], or 4.1σ local and 3.5σ global [37].…”