Fast simulation of the CMS detector

Orbaker, D.; Collaboration, the Cms

doi:10.1088/1742-6596/219/3/032053

Cited by 23 publications

(18 citation statements)

References 3 publications

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“…The gluinos and squarks decay according to phase space [65]. To render the computational requirements manageable, the detector response is described using the CMS fast simulation [66,67], which yields consistent results with the GEANT4-based simulation, except that we apply a correction of 1% to account for differences in the efficiency of the jet quality requirements [37], corrections of 5-12% to account for differences in the b jet tagging efficiency, and corrections of 0-14% to account for differences in the modeling of H T and H miss T .…”

Section: Simulated Event Samplesmentioning

confidence: 99%

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV

Sirunyan¹,

Tumasyan²,

Adam³

et al. 2017

Phys. Rev. D

114

172

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A search for supersymmetry is presented based on multijet events with large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy of ffiffi ffi s p ¼ 13 TeV. The data, corresponding to an integrated luminosity of 35.9 fb −1 , were collected with the CMS detector at the CERN LHC in 2016. The analysis utilizes four-dimensional exclusive search regions defined in terms of the number of jets, the number of tagged bottom quark jets, the scalar sum of jet transverse momenta, and the magnitude of the vector sum of jet transverse momenta. No evidence for a significant excess of events is observed relative to the expectation from the standard model. Limits on the cross sections for the pair production of gluinos and squarks are derived in the context of simplified models. Assuming the lightest supersymmetric particle to be a weakly interacting neutralino, 95% confidence level lower limits on the gluino mass as large as 1800 to 1960 GeV are derived, and on the squark mass as large as 960 to 1390 GeV, depending on the production and decay scenario.

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Section: Simulated Event Samplesmentioning

confidence: 99%

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV

Sirunyan¹,

Tumasyan²,

Adam³

et al. 2017

Phys. Rev. D

114

172

View full text Add to dashboard Cite

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“…The signal production cross sections are computed [119][120][121][122][123] with NLO plus next-to-leading-logarithm (NLL) accuracy. To reduce computational requirements, the detector is modeled with the CMS fast simulation program [124,125], which yields consistent results compared with the GEANT4-based simulation, except that we apply a correction of 1% to account for differences in the efficiency of the jet quality requirements [126], and corrections of 3-10% to account for differences in the b-jet tagging efficiency.…”

Section: Event Simulationmentioning

confidence: 99%

Theoretical and Experimental Approaches to Dark Energy and the Cosmological Constant Problem

Borzou¹

2018

Springer Theses

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The cosmological constant problem is one of the most pressing problems of physics at this time. In this dissertation the problem and a set of widely-discussed theoretical solutions to this problem are reviewed. It is shown that a recently developed Lorentz gauge theory of gravity can provide a natural solution. In this theory presented here, the metric is not dynamical and it is shown that the Schwartzschild metric is an exact solution. Also, it is proven that the de Sitter space is an exact vacuum solution and as a result the theory is able to explain the expansion of the universe with no need for dark energy. Renormalizability of the theory is studied as well. It is also shown that, under a certain condition, the theory is power-counting renormalizable.

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“…We simulate ED in the ADD model using the sherpa (v1.1.2) [17] MC generator, which samples different operating points in M S and n ED , followed by a fast parametric simulation of the CMS detector [18]. A fast simulation is adequate for describing multiphoton final states and has been extensively validated using full simulation of the detector via geant4 [19].…”

Section: Signal and Background Estimationmentioning

confidence: 99%

Search for large extra dimensions in the diphoton final state at the Large Hadron Collider

Quertenmont¹,

Chatrchyan

Başeğmez

et al. 2011

J. High Energ. Phys.

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Abstract:A search for large extra spatial dimensions via virtual-graviton exchange in the diphoton channel has been carried out with the CMS detector at the LHC. No excess of events above the standard model expectations is found using a data sample collected in proton-proton collisions at √ s = 7 TeV and corresponding to an integrated luminosity of 36 pb −1 . New lower limits on the effective Planck scale in the range of 1.6-2.3 TeV at the 95% confidence level are set, providing the most restrictive bounds to date on models with more than two large extra dimensions. Keywords: Hadron-Hadron ScatteringOpen IntroductionCompact large extra dimensions (ED) are an intriguing proposed solution to the hierarchy problem of the standard model (SM), which refers to the puzzling fact that the fundamental scale of gravity M Pl ∼ 10 19 GeV is so much higher than the electroweak symmetry breaking scale ∼ 10 3 GeV. With such a difference in scales, it is difficult to protect the Higgs boson mass from radiative corrections without a very high degree of fine-tuning. The original proposal to use ED to solve the hierarchy problem was presented by ArkaniHamed, Dimopoulos, and Dvali (ADD) [1,2]. They posited a scenario wherein the SM is constrained to the common 3+1 space-time dimensions, while gravity is free to propagate through the entire multidimensional space. Thus, the gravitational flux in 3+1 dimensions is effectively diluted by virtue of the multidimensional Gauss's Law. The fundamental Planck scale M D is therefore related to the apparent scale M Pl according to the formula M n ED +2 D = M 2 Pl /r n ED , where r and n ED are the size and number of the extra dimensions, respectively. A review of current limits on the ADD model can be found in ref. [3].Phenomenologically, this large ED scenario results in s-channel production of massive, virtual Kaluza-Klein (KK) graviton states, which can decay into two photons [4]. Decays to fermions are suppressed relative to photons because the graviton is spin-2 and the fermions cannot be produced in the s wave. Because the KK gravitons propagate through the compact extra dimensions, their wavefunction must satisfy periodic boundary conditions, which result in discrete energy levels with modal spacing of the order of the inverse ED size, from 1 meV to 100 MeV. This results in an apparent continuum spectrum of diphotons, rather than distinct resonances.Summing over KK modes results in a divergence in the cross section, so an ultraviolet (UV) cutoff scale M S is needed. This scale is related to -but potentially different fromthe fundamental Planck scale M D , as the precise relationship depends on the UV completion of the effective theory. The effects of virtual-graviton production on the cross section are -1 - JHEP05(2011)085parameterized by the single variable η G = F/M 4 S , where F is an order-unity dimensionless parameter, for which several conventional assumptions exist: where √ŝ is the center-of-mass energy of the hard parton-parton collision. We note that the HLZ convention contai...

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Fast simulation of the CMS detector

Cited by 23 publications

References 3 publications

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV

Theoretical and Experimental Approaches to Dark Energy and the Cosmological Constant Problem

Search for large extra dimensions in the diphoton final state at the Large Hadron Collider

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