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• Zhicai Z • Jiajing Mao • Summer Student Main • Summer 2013 • Si Timing • Computing Admin Provisioning System • Computing CRABLocal • Computing Pcie Dev Optimization • Computing SC 14 • Computing Admin JBODHDFS • Computing Support • Computing T 2 SDN • Brad Filippone • Joseph Lykken • EWK-10-008 • Higgs To Gamma Gamma • more... | ||||||||
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| < < | Welcome to the Main web | |||||||
| > > | The CMS High Energy Physics Group at the CaltechResearch Highlights | |||||||
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| < < | This site is running TWiki version TWiki-6.1.0, Mon, 16 Jul 2018, build 30610, Plugin API version 6.10 | |||||||
| > > | High energy collisions at the Large Hadron Collider could excite the invisible Higgs field enough to produce a Higgs particle, but this unstable Higgs boson would decay instantly to lighter particles, and only one collision in a billion is expected to produce a Higgs. LHC collisions may also produce particles of dark matter, but these heavy particles would be invisible, recoiling from a complex spray of visible particles. The Caltech group at CMS is overcoming the many challenges of making the invisible visible at the LHC. The group is making possible the exquisitely calibrated photon calorimetry measurements [1] needed to tease out a one-in-a-billion Higgs or other exotic particles that decay to photons. For dark matter, the group is pursuing a discovery strategy for signals with missing energy and momentum from unseen particles: using the earliest data to commission CMS calorimetry for jets and missing energy [2], validating the understanding of these signatures in similar Standard Model processes, and implementing new data-driven techniques [3] to maximize the inclusive CMS sensitivity to dark matter. A crucial aspect of the Caltech approach is taming the information flow from LHC collisions: a vertically integrated approach to triggering, dataset definition, data quality monitoring, software development, distributed computing and collaborative systems, resulting in the the robust framework required to characterize discovery signals [4].
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| > > | [1] Intercalibration of the CMS Electromagnetic Calorimeter with Neutral Pion Decays Nuclear Physics B Volume 197, Issue 1, 15 December 2009, pp. 147-150, doi:10.1016/j.nuclphysbps.2009.10.054 (2009) [2] SUSY at the LHC: Examples of search, navigation and orientation Eur.Phys.J.C59(2009) Springer Berlin / Heidelberg, doi:10.1140/epjc/s10052-008-0778-0 (2008). [3] Study of Z production in association with jets in proton-proton collisions at sqrt(s) = 10 TeV with the CMS detector at the CERN LHC CMS-PAS-EWK-08-006 (2009) and Study of the ratio of W+jets to Z+jets in proton--proton collisions at sqrt(s) = 10~TeV with the CMS detector at the CERN LHC CMS-PAS-EWK-08-006 (2009) [4] Missing energy look-alikes with 100 pb-1 at the CERN LHC Phys. Rev. D 78, 075008 (2008). | |||||||
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