Performance of the CMS missing transverse momentum reconstruction in pp data at √<i>s</i> = 8 TeV

Collaboration, the Cms

doi:10.1088/1748-0221/10/02/p02006

Cited by 119 publications

(153 citation statements)

References 24 publications

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“…The presence of particles that do not interact with the detector material, such as hypothetical dark matter particles or neutrinos, is indirectly revealed by the missing transverse momentum in an event [133]. The raw missing transverse momentum vector is defined in such a way as to balance the vectorial sum of the transverse momenta of all particles,…”

Section: Jets and Missing Transverse Energymentioning

confidence: 99%

“…The performance of E miss T reconstruction with all corrections applied is assessed with a sample of observed events selected in the dimuon final state that is dominated by events with a Z boson decaying to two muons [133]. The dataset is collected with a trigger requiring the presence of two muons passing p T thresholds of 17 and 8 GeV, respectively.…”

Section: Jets and Missing Transverse Energymentioning

confidence: 99%

“…If more than one vertex is found, the one with the highest p 2 T sum of associated tracks is chosen as the interaction point for event reconstruction. Algorithms are used to remove events with detector-and beam-related noise that can mimic event topologies with high energy and large p T imbalance [166,167,133].…”

Section: Event Selectionmentioning

confidence: 99%

“…Finally, events containing signatures consistent with beam-induced background or anomalous noise in the calorimeters are rejected using dedicated filters [166,133].…”

Section: Analysis Strategy and Event Selectionmentioning

confidence: 99%

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Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Duarte¹

2017

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All rights reserved. I thank Maurizio Pierini for his intense mentorship beginning at CERN in 2011 and continuing to this day. Maurizio taught me how to be a modern particle physicist, by sharing his expertise in computing, statistics, and phenomenology. He was also invaluable in helping me prepare this manuscript. ABSTRACTIn this thesis, we present two inclusive searches for supersymmetric particles at √ s = 8 and 13 TeV using the razor variables and guided by the principle of naturalness. We build a framework to explore the natural supersymmetry parameter space of gluino and top squark masses and branching ratios, which is a unique attempt to cover this parameter space in a more complete way than ever before using LHC data. With this approach, the production of top squarks and gluinos are excluded below ∼ 700 GeV and ∼ 1.6 TeV, respectively, independent of the branching ratios, constituting one of the tightest constraints on natural supersymmetry from the LHC. Motivated by the need to mitigate the effects of multiple interactions per bunch crossing (pileup), an essential feature of present and future hadron colliders, in this thesis we also study the precision timing capabilities of a LYSO-based sampling calorimeter, and achieve a time resolution of ∼ 30 ps in electron test beam measurements. The achieved resolution corresponds to the precision needed to significantly reduce the inclusion of pileup particles in the reconstruction of the event of interest. This study is foundational in building an R&D program on precision timing for the high-luminosity LHC and other future hadron colliders. We also propose alternative simplified models to study Higgs-plus-jets events at the LHC, and reinterpret an excess observed at 8 TeV in the context of these models. Finally, we discuss a search for narrow resonances in the dijet mass spectrum at 13 TeV using the data-scouting technique at CMS, which records a smaller event format to increase the maximum recordable rate. For the benchmark models with a vector or axial-vector mediator that couples to quarks and dark matter particles, the dijet search excludes mediator masses from 0.5 TeV up to ∼ 2.7 TeV largely independent of the dark matter particle mass, which constitutes a larger exclusion than traditional mono-X searches at the LHC. In the plane of the dark matter-nucleon interaction cross section versus dark matter mass, the dijet search is also more sensitive than direct detection experiments for spin-dependent cross sections. J. M. G. D. performed the maximium-likelihood-fit-based background estimation and statistical interpretation using CMS data for this analysis and contributed to writing the manuscript for publication.[3] D. Anderson et al. "On timing properties of LYSO-based calorimeters".

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Section: Jets and Missing Transverse Energymentioning

confidence: 99%

Section: Jets and Missing Transverse Energymentioning

confidence: 99%

Section: Event Selectionmentioning

confidence: 99%

“…Finally, events containing signatures consistent with beam-induced background or anomalous noise in the calorimeters are rejected using dedicated filters [166,133].…”

Section: Analysis Strategy and Event Selectionmentioning

confidence: 99%

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Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Duarte¹

2017

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“…To emulate the effects of a detector, the MET is smeared as a function of the mediator p T [57]. The jets are smeared 3 We note that very recently Refs.…”

Section: A Collider Design and Monte Carlo Generationmentioning

confidence: 99%

Closing up on dark sectors at colliders: From 14 to 100 TeV

et al. 2016

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We investigate the reach of the LHC Run 2 and that of a future circular hadron collider with up to 100 TeV center of mass energy for the exploration of potential dark matter sectors. These dark sectors are conveniently and broadly described by simplified models. The simplified models we consider provide microscopic descriptions of interactions between the standard model partons and the dark sector particles mediated by the four basic types of (s-channel) messenger fields: scalar, pseudoscalar, vector or axialvector. Our analysis extends and updates the previously available results for the LHC at 8 and 14 TeV to 100 TeV for models with all four messenger types. We revisit and improve the analysis at 14 TeV, by studying a variety of analysis techniques, concluding that the most discriminating variables correspond to the missing transverse energy and the azimuthal angle between jets in the final state. Going to 100 TeV, the limits on simplified models of dark matter are enhanced significantly, in particular for heavier mediators and dark sector particles, for which the available phase space at the LHC is restricted. The possibility of a 100 TeV collider provides an unprecedented coverage of the dark sector basic parameters and a unique opportunity to pin down the particle nature of dark matter and its interactions with the standard model.

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Data Analysis Strategy

Akpinar

2024

Springer Theses

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Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV

Cited by 119 publications

References 24 publications

Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Closing up on dark sectors at colliders: From 14 to 100 TeV

Data Analysis Strategy

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