Publisher’s Note: Spin determination of single-produced resonances at hadron colliders [Phys. Rev. D<b>81</b>, 075022 (2010)]

Gao, Y.; Gritsan, A. V.; Guo, Z. J.; Melnikov, Kirill; Schulze, Markus; Tran, N. V.

doi:10.1103/physrevd.81.079905

Cited by 78 publications

(180 citation statements)

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“…For this purpose, its spin and parity [3][4][5][6][7][8][9][10][11][12] and its couplings to the SM particles should be determined as accurately as possible (see Ref. [13] for the review on the SM Higgs boson and references therein).…”

Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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“…If the observed event rate for this resonance is compatible, within experimental uncertainties, to the rate predicted for the Higgs, we must still confront the problem of whether we have observed the SM Higgs or a look-alike [1][2][3]. If the event rate is much larger than that predicted for the Higgs, we then need to address the problem of determining the true identity and significance of this Higgs imposter.…”

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confidence: 99%

Singlet scalars as Higgs boson imposters at the Large Hadron Collider

2011

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An electroweak singlet scalar can couple to pairs of vector bosons through loop-induced dimension five operators. Compared to a Standard Model Higgs boson, the singlet decay widths in the diphotons and Zγ channels are generically enhanced, while decays into massive final states like W W and ZZ are kinematically disfavored. The overall event rates into γγ and Zγ can exceed the Standard Model expectations by orders of magnitude. Such a singlet may appear as a resonant signal in the γγ and Zγ channels, even with a mass above the W W kinematic threshold.

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“…qqH), are generated with POWHEG [18] at next-toleading order (NLO) and a dedicated generator from Ref. [19]. Additional samples of, WH, ZH, and t " tH events are generated with PYTHIA [20].…”

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confidence: 99%

Search for the Standard Model Higgs Boson in the Decay ChannelH→ZZ→4linppCollisions ats
Chatrchyan¹,
Khachatryan²,
Sirunyan³
et al. 2012
Phys. Rev. Lett.
92
1
10
0
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A search for a Higgs boson in the four-lepton decay channel H ! ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range of 110 < m H < 600 GeV. The analysis uses data corresponding to an integrated luminosity of 4:7 fb À1 recorded by the CMS detector in pp collisions at ffiffi ffi s p ¼ 7 TeV from the LHC. Seventy-two events are observed with four-lepton invariant mass m 4' > 100 GeV (with 13 below 160 GeV), while 67:1 AE 6:0 (9:5 AE 1:3) events are expected from background. The four-lepton mass distribution is consistent with the expectation of standard model background production of ZZ pairs. Upper limits at 95% confidence level exclude the standard model Higgs boson in the ranges of GeV. Small excesses of events are observed around masses of 119, 126, and 320 GeV, making the observed limits weaker than expected in the absence of a signal.

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Publisher’s Note: Spin determination of single-produced resonances at hadron colliders [Phys. Rev. D81, 075022 (2010)]

Cited by 78 publications

References 0 publications

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Singlet scalars as Higgs boson imposters at the Large Hadron Collider

Search for the Standard Model Higgs Boson in the Decay ChannelH→ZZ→4linppCollisions ats
Chatrchyan¹,
Khachatryan²,
Sirunyan³
et al. 2012
Phys. Rev. Lett.
92
1
10
0
View full text Add to dashboard Cite

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Publisher’s Note: Spin determination of single-produced resonances at hadron colliders [Phys. Rev. D81, 075022 (2010)]

Cited by 78 publications

References 0 publications

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Singlet scalars as Higgs boson imposters at the Large Hadron Collider

Search for the Standard Model Higgs Boson in the Decay ChannelH→ZZ→4linppCollisions atsChatrchyan1, Khachatryan2, Sirunyan3 et al. 2012Phys. Rev. Lett.921100View full textAdd to dashboardCite

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Search for the Standard Model Higgs Boson in the Decay ChannelH→ZZ→4linppCollisions ats
Chatrchyan¹,
Khachatryan²,
Sirunyan³
et al. 2012
Phys. Rev. Lett.
92
1
10
0
View full text Add to dashboard Cite