Time-delayed electrons from Higgs decays to right-handed neutrinos

Mason, John D.

doi:10.1007/jhep07(2019)089

Cited by 13 publications

(15 citation statements)

References 43 publications

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“…The proposal for a MIP timing detector (MTD) [74] for the phase II CMS upgrade, which will provide the timing information for MIPs (minimum ionizing particles), can provide additional information which is relevant for the lifetime reconstruction of LLPs. A few recent works have already studied aspects of the role that such a detector could play in LLP searches [95,118]. It has also been shown in Refs.…”

Section: Including Precise Timing Informationmentioning

confidence: 98%

“…As an example, the authors of [95] followed one CMS [96] and one ATLAS [97] analysis to estimate the double differential inclusive jet cross-section and the inclusive prompt photon cross-section, respectively. They found that if the probability to measure an object with a given lifetime is modelled as a gaussian smear with a time resolution of 30 ps (the standard deviation of the gaussian distribution), the number of background events mis-measured to have a time-delay of more than 1 ns was negligible, as 1 ns lies more than 30 standard deviations away from the central value of the distribution.…”

Section: A Note On Backgroundsmentioning

confidence: 99%

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Determining the lifetime of long-lived particles at the HL-LHC

et al. 2021

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We examine the capacity of the Large Hadron Collider to determine the mean proper lifetime of long-lived particles assuming different decay final states. We mostly concentrate on the high luminosity runs of the LHC, and therefore, develop our discussion in light of the high amount of pile-up and the various upgrades for the HL-LHC runs. We employ model-dependent and model-independent methods in order to reconstruct the proper lifetime of neutral long-lived particles decaying into displaced leptons, potentially accompanied by missing energy, as well as charged long-lived particles decaying ihnto leptons and missing energy. We also present a discussion for lifetime estimation of neutral long-lived particles decaying into displaced jets, along with the challenges in the high PU environment of HL-LHC. After a general discussion, we illustrate and discuss these methods using several new physics models. We conclude that the lifetime can indeed be reconstructed in many concrete cases. Finally, we discuss to which extent including timing information, which is an important addition in the Phase-II upgrade of CMS, can improve such an analysis.

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Section: Including Precise Timing Informationmentioning

confidence: 98%

Section: A Note On Backgroundsmentioning

confidence: 99%

Determining the lifetime of long-lived particles at the HL-LHC

et al. 2021

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“…Recently, some precision timing detectors are proposed to be installed at CMS [49], AT-LAS [50,51] and LHCb [52]. These timing detectors, which aim to reduce the pile-up rate at the high luminosity LHC (HL-LHC), can also be used in long-lived particle searches [53][54][55][56]. In this analysis, we focus on one of the timing detectors, the minimum ionizing particle (MIP) timing detector to be installed to the CMS detector (hereafter MTD CMS) [49], which has a ∼30 pico-second timing resolution.…”

Section: Timing Detectormentioning

confidence: 99%

“…The dominant SM backgrounds come from the multi trackless jets in the same-vertex (SV) hard collisions and in the pile-up (PU) events [53], as well as photons in SV hard collisions [54]. The SV background arises because of the finite timing resolution; the PU background is due to the fact that within one bunch crossing, two hard collisions occurring at two different times can lead to a time delay signal.…”

Section: Jhep05(2020)055mentioning

confidence: 99%

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Enhanced long-lived dark photon signals at the LHC

Liu

Tran

2020

J. High Energ. Phys.

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We construct a model in which the standard model is extended by a hidden sector with two gauge U(1) bosons. A Dirac fermion ψ charged under both U(1) fields is introduced in the hidden sector which can be a subcomponent of the dark matter in the Universe. Stueckelberg mass terms between the two new gauge U(1) fields and the hypercharge gauge boson mediate the interactions between the standard model sector and the hidden sector. A remarkable collider signature of this model is the enhanced long-lived dark photon events at the LHC than the conventional dark photon models; the long-lived dark photons in the model can be discriminated from the background by measuring the time delay signal in the precision timing detectors which are proposed to be installed in the LHC upgrades and have an O(10) pico-second detection efficiency. Searches with current LHCb data are also investigated. Various experimental constraints on the model including collider constraints and cosmological constraints are also discussed.

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Jet timing

Chiu

Liu

Low

et al. 2022

J. High Energ. Phys.

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The measurement of the arrival time of a particle, such as a lepton, a photon, or a pion, reaching the detector provides valuable information. A similar measurement for a hadronic final state, however, is much more challenging as one has to extract the relevant information from a collection of particles. In this paper, we explore various possibilities in defining the time of a jet through the measurable arrival times of the jet constituents. We find that a definition of jet time based on a transverse momentum weighted sum of the times of the constituents has the best performance. For prompt jets, the performance depends on the jet trajectory. For delayed jets, the performance depends on the trajectory of the jet, the trajectory of the mother particle, and the location of the displaced vertex. Compared to the next-best-performing jet time definition, the transverse momentum weighted sum has roughly a factor of ten times better jet time resolution. We give a detailed discussion of the relevant effects and characterize the full geometrical dependence of the performance. These results highlight the critical importance of using a proper definition of jet time with its corresponding detector-dependent calibration and the exciting possibility of deepening our understanding of jets in the time domain.

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Time-delayed electrons from Higgs decays to right-handed neutrinos

Cited by 13 publications

References 43 publications

Determining the lifetime of long-lived particles at the HL-LHC

Determining the lifetime of long-lived particles at the HL-LHC

Enhanced long-lived dark photon signals at the LHC

Jet timing

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