Measuring<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>couplings at the CERN LHC

Petriello, Frank; Quackenbush, Seth

doi:10.1103/physrevd.77.115004

Cited by 82 publications

(68 citation statements)

References 26 publications

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“…For one thing, the mass of a WIMPonium state decaying into leptons can be measured with great precision, in contrast to mass measurements of WIMPs in missing energy events, which are expected to lead to far larger uncertainties. Further detailed study of WIMPonium branching ratios and production/ decay distributions can reveal many of the details of the pattern of couplings to the SM particles [21]. The detailed couplings can be mapped back into the WIMP-SM couplings of equations (5) or (6), and from there into the UV theory.…”

Section: Implications At Future Colliders a Vector Wimponiummentioning

confidence: 99%

Bound states of weakly interacting dark matter

2009

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We explore the possibility that weakly interacting dark matter can form bound states -WIMPonium. Such states are expected in a wide class of models of particle dark matter, including some limits of the Minimal Supersymmetric Standard Model. We examine the conditions under which we expect bound states to occur, and use analogues of NRQCD applied to heavy quarkonia to provide estimates for their properties, including couplings to the Standard Model. We further find that it may be possible to produce WIMPonium at the LHC, and explore the properties of the WIMP that can be inferred from measurements of the WIMPonium states.

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Section: Implications At Future Colliders a Vector Wimponiummentioning

confidence: 99%

Bound states of weakly interacting dark matter

2009

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“…FW and interference effects have been studied by a number of authors also in different processes (see for example refs. [12][13][14][15][16][17][18][19][20][21]). For heavy neutral vector boson production in Drell-Yan, only within narrow width Z -boson scenarios can the deviations from the NWA due to the above two phenomena be safely neglected at least to some degree.…”

Section: Jhep07(2016)068mentioning

confidence: 99%

Drell-Yan production of multi Z ′-bosons at the LHC within Non-Universal ED and 4D Composite Higgs Models

Accomando

Barducci

Curtis

et al. 2016

J. High Energ. Phys.

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The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z -bosons and the Standard Model Z and γ. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z -boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z -boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z peaking structure. We conclude that in a variety of cases, specifically those in which the leptonic decays modes of one or more of the heavy neutral gauge bosons are suppressed and/or significant interference effects exist between these or with the background, especially present when their decay widths are significant, traditional JHEP07 (2016)068 search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics.

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“…Following Ref. [15], at least one more linearly independent observable is required than those available in the light lepton sector, where some degeneracy still ocours. Considering multiple final states and their spin asymmetries could provide the necessary measurements to extract the fermionic couplings in this minimal case, that become essential when testing the univerality of couplings or when considering models with more general coupling structures.…”

Section: Discussionmentioning

confidence: 99%

“…Possibly, the study of differential and angular distributions of charged leptons, as in Ref. [15], can fully resolve the whole parameter space. However, here we would like to make a different point: if the measure of the (spin) asymmetries in b-quark final states becomes available, it would be of great interest.…”

Section: Polarisation Asymmetry: a Lmentioning

confidence: 99%

“…In Ref. [15], it is shown that a set of 4 coefficients (c q , e q ; q = u, d) that are functions of the Z couplings can be extracted from 4 observables related to charge asymmetry and total cross section in the light lepton channel (electrons and muons), by restricting the kinematical domain of the differential cross section. It is observed that a degeneracy exists between the dependence on leptonic and quark couplings in this analysis, stemming from the minimal assumption of 5 independent parameters and only 4 independent observables.…”

Section: Asymmetries and Z Couplingsmentioning

confidence: 99%

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Non-exotic Z′ signals in ℓ + ℓ −, $ b\overline{b} $ and $ t\overline{t} $ final states at the LHC

Basso

Mimasu

Moretti

2012

J. High Energ. Phys.

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In the attempt to fully profile a Z boson accessible at the Large Hadron Collider (LHC), we study the sensitivity of di-lepton (for the electron, muon and tauon cases) and di-quark (for the case of the heavy flavours, t and, possibly, b) samples to the nature of the new gauge state, for a one-dimensional class of non-exotic Z bosons. Assuming realistic final state reconstruction efficiencies and error estimates, we find that, depending on the CERN collider energy and luminosity, the best chances of extracting the Z quantum numbers occur when two or more of these channels are simultaneously explored, as none of them separately enables one to fully probe the parameter spaces of the aforementioned models. Effects of Standard Model (SM) background as well interferences between this and the various Z signals have been accounted for. A complete study of cross sections and asymmetries (both spatial and spin ones) makes clear the need for complementarity, especially for their disentanglement over the full parameter space.

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MeasuringZ′couplings at the CERN LHC

Cited by 82 publications

References 26 publications

Bound states of weakly interacting dark matter

Bound states of weakly interacting dark matter

Drell-Yan production of multi Z ′-bosons at the LHC within Non-Universal ED and 4D Composite Higgs Models

Non-exotic Z′ signals in ℓ + ℓ −, $ b\overline{b} $ and $ t\overline{t} $ final states at the LHC

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