Abstract
A recent preliminary investigation based on Durgut's report at the American Physical Society site shows a structure at $18.4~ {\rm GeV}$ exists in the invariant mass distribution of $\Upsilon l^+l^- ~ (l = e,\, \mu)$ at the LHC center-of-mass energy of $7$ and $8~ {\rm TeV}$. Its appearance attracts attention of theorists and experimentalists of high energy physics, because it might be a Higgs-like boson of $18.4~ {\rm GeV}$ which would serve as a signal of the new physics beyond the Standard Model. We have carried out computations on the corresponding quantities (production and decay rates) based on quantum field theory and compared the results with experimental data. Our numerical results do not support the assertion that the $18.4~ {\rm GeV}$ peak corresponds to a neutral $0^{++}$ boson which decays into $\Upsilon l^+l^-$. Much further works (both experimental and theoretical) are badly needed.
Highlights
The 125 GeV Higgs boson was found by the ATLAS and CMS Collaborations in 2012, which pastes the last brick of the Standard Model (SM)
II, we present our analytical calculation for Υlþl− production at the LHC in the framework of a beyond SM (BSM) model, in which we assume that the interaction of the BSM Higgs-like boson with SM particles is in analogue to that of the SM Higgs boson
We assume the effective couplings of the 0þþ BSM Higgslike boson to the gluons and bottom quarks have the same evolution behavior as the corresponding ones of the SM
Summary
The 125 GeV Higgs boson was found by the ATLAS and CMS Collaborations in 2012, which pastes the last brick of the Standard Model (SM). By analyzing the data sets collected by the CMS detector at a center-of-mass energy of 7 and 8 TeV with an integrated luminosity of 25.6 fb−1 [3], and taking the kinematic requirements of pT;l > 2.0 GeV and jηlj < 2.4 on the final-state leptons [1,3], the experimenters observed a peaking structure By their rigorous analysis, the peak is located at 18.4 Æ 0.1ðstatÞ Æ 0.2ðsystÞ GeV for the Υμþμ− and Υeþe− channels combined; event numbers are 44 Æ 13 and 35 Æ 13 for the Υμþμ− and Υeþe− channels, respectively, and its significance is 3.6 standard deviation after taking into account the look-elsewhere effect [1,3]
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