Phenomenological signatures of additional scalar bosons at the LHC

Buddenbrock, S. E. von; Chakrabarty, Nabarun; Cornell, Alan S.; Kar, D.; Kumar, M.; Mandal, Tanumoy; Mellado, B.; Mukhopadhyaya, Biswarup; Reed, R. G.; Ruan, X.

doi:10.1140/epjc/s10052-016-4435-8

Cited by 94 publications

(152 citation statements)

References 47 publications

Supporting

Mentioning

148

Contrasting

Order By: Relevance

“…The LO decay width for the decay of a neutral CP-even Higgs boson into two identical CP-even scalars is given by (i, j = 1, 2, 3) 19) with the trilinear Higgs coupling 20) where ijk denotes the totally antisymmetric tensor in three dimensions with 123 = 1. At variance with the processes discussed so far, Higgs-to-Higgs decays in the CP-even sector are directly sensitive to the singlet VEV v S at tree level.…”

Section: Electroweak One-loop Corrections To H J → H I H Imentioning

confidence: 99%

Gauge-independent renormalization of the N2HDM

Krause

López-Val

Mühlleitner

et al. 2017

J. High Energ. Phys.

View full text Add to dashboard Cite

Abstract:The Next-to-Minimal 2-Higgs-Doublet Model (N2HDM) is an interesting benchmark model for a Higgs sector consisting of two complex doublet and one real singlet fields. Like the Next-to-Minimal Supersymmetric extension (NMSSM) it features light Higgs bosons that could have escaped discovery due to their singlet admixture. Thereby, the model allows for various different Higgs-to-Higgs decay modes. Contrary to the NMSSM, however, the model is not subject to supersymmetric relations restraining its allowed parameter space and its phenomenology. For the correct determination of the allowed parameter space, the correct interpretation of the LHC Higgs data and the possible distinction of beyond-the-Standard Model Higgs sectors higher order corrections to the Higgs boson observables are crucial. This requires not only their computation but also the development of a suitable renormalization scheme. In this paper we have worked out the renormalization of the complete N2HDM and provide a scheme for the gauge-independent renormalization of the mixing angles. We discuss the renormalization of the Z 2 soft breaking parameter m 2 12 and the singlet vacuum expectation value v S . Both enter the Higgs self-couplings relevant for Higgs-to-Higgs decays. We apply our renormalization scheme to different sample processes such as Higgs decays into Z bosons and decays into a lighter Higgs pair. Our results show that the corrections may be sizable and have to be taken into account for reliable predictions.

show abstract

Section: Electroweak One-loop Corrections To H J → H I H Imentioning

confidence: 99%

Gauge-independent renormalization of the N2HDM

Krause

López-Val

Mühlleitner

et al. 2017

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…In the section above, it was stated that the excesses and results mentioned can all be explained by proposing the existence of a new heavy scalar H. This approach was taken in reference [15], advocating the existence of a heavy scalar with a mass around ∼ 270 GeV using data only from Run 1 of the LHC. The best fit point for this hypothesis was determined to be…”

Section: A 2hdm Interpretationmentioning

confidence: 99%

“…While the details of 2HDMs are not discussed in this short paper in any detail (a contemporary discussion can be found in reference [17]), it should be noted that the heavy scalar which is the subject of reference [15] could be the extra CP-even scalar found in a 2HDM. If this is the case, then the A and H ± bosons should also exist in nature.…”

Section: A 2hdm Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

A heavy scalar of mass 270 GeV and its possible connection to the 750 GeV excess

Buddenbrook

Cornell

Kar

et al. 2017

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

Abstract. Run 1 of the LHC saw many interesting and surprising results, hinting at physics beyond the Standard Model. One of these is the search for lepton pairs in association with high missing energy, which produced a sizeable excess in its rate from both the ATLAS and CMS collaborations. While ATLAS and CMS interpret this using a supersymmetric model, we have shown that the excess can partly be explained by the existence of a new heavy scalar boson, H. This heavy scalar can decay to weak vector bosons and also Standard Model Higgs bosons and missing energy, making it a prime candidate in the search for high pT di-lepton pairs. An analysis is performed to determine the rate of di-lepton production with large missing energy for opposite sign pairs. We show that the heavy scalar produces a non-negligible rate, but cannot fully explain the excesses. For this reason, we look also to incorporating a full two Higgs doublet model to enhance this rate, where the pseudo-scalar A in the spectrum of new particles is considered to be a candidate for the Run 2 di-photon excess at 750 GeV. Key Higgs results from Run 1By now it is clear that Run 1 of the Large Hadron Collider (LHC) saw the discovery of the Higgs boson, which was measured to have a mass of 125.09 ± 0.24 GeV according to a combination of both ATLAS and CMS results [1]. This particle's couplings have also been shown to behave like a Higgs boson predicted by the Standard Model (SM) [2]. However, studies on the kinematics of this particle have revealed some deviations from SM predictions. In particular, here we can consider the Higgs differential fiducial p T spectra published by both ATLAS [3,4] and CMS [5,6]. Looking at the ATLAS results, it is clear that the observed Higgs boson events have significantly more transverse momentum than what is predicted by the SM. Typically, this is indicative of the Higgs boson decaying from some heavy object. The CMS results are not as compelling as the ATLAS results, but the trend is still observable in the h → ZZ * → 4ℓ spectrum albeit with a small significance.Searches for heavy Higgs boson-like particles from Run 1 have also produced some exciting results. For instance, several searches for resonant production of di-Higgs pairs (that is, the decay of some heavy resonance to two Higgs bosons H → hh) from ATLAS [7] and CMS [8,9,10] have shown excesses around the ∼ 300 GeV region of the resonance mass. A similar effect can be seen in searches for resonant V V production (where V is a vector boson, either Z or W ± ). In this channel, CMS [11] sees an excess of events where the resonance mass is about ∼ 275 GeV.

show abstract

“…[15]. While no assumptions are made here as to the nature of H, it can be viewed as a part of a 2HDM þ χ scenario where H may be considered as the CP-even heavy scalar boson [14]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

Phys. Rev. D

View full text Add to dashboard Cite

A search for dark matter in association with a Higgs boson decaying to two photons is presented. This study is based on data collected with the ATLAS detector, corresponding to an integrated luminosity of 36.1 fb −1 of proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV in 2015 and 2016. No significant excess over the expected background is observed. Upper limits at 95% confidence level are set on the visible cross section for beyond the Standard Model physics processes, and the production cross section times branching fraction of the Standard Model Higgs boson decaying into two photons in association with missing transverse momentum in three different benchmark models. Limits at 95% confidence level are also set on the observed signal in two-dimensional mass planes. Additionally, the results are interpreted in terms of 90% confidence-level limits on the dark-matternucleon scattering cross section, as a function of the dark-matter particle mass, for a spin-independent scenario.

show abstract

Phenomenological signatures of additional scalar bosons at the LHC

Cited by 94 publications

References 47 publications

Gauge-independent renormalization of the N2HDM

Gauge-independent renormalization of the N2HDM

A heavy scalar of mass 270 GeV and its possible connection to the 750 GeV excess

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

Contact Info

Product

Resources

About