Evidence for a Narrow Higgs-like Diphoton Resonance with a Mass of 125 GeV in Pp Collisions at [square Root Of]s
Evidence for a Narrow Higgs-like Diphoton Resonance with a Mass of 125 GeV in Pp Collisions at [square Root Of]s

Author: Joshua Lorne Bendavid

Publisher:

Published: 2013

Total Pages: 158

ISBN-13:

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We have performed a search for the production of the standard model Higgs boson decaying to diphotons in pp collisions at the LHC at [square root of]s = 7-8 TeV with the CMS detector. Having analyzed data corresponding to 5.1 fb-1 at [square root of]s = 7 TeV (2011) and 5.3 fb-1 at [square root of]s = 8 TeV (2012), a statistically significant excess of events is observed with respect to the background prediction. Interpreted as a standard model Higgs, this excess has a local significance of 4.1 standard deviations, with the maximum significance occurring for a Higgs mass of 125 GeV. Taking into account the trials factor given the search range of 110 GeV to 150 GeV in Higgs mass, this excess has a global significance of 3.2 standard deviations. This constitutes evidence for a new particle decaying to diphotons with a mass of around 125 GeV. The rate of observed events is consistent with predictions for the standard model Higgs boson.

Search for Diphoton Resonances in the Mass Range from 150 to 850 GeV in Pp Collisions at $\sqrt{s}$
Search for Diphoton Resonances in the Mass Range from 150 to 850 GeV in Pp Collisions at $\sqrt{s}$

Author:

Publisher:

Published: 2015

Total Pages: 38

ISBN-13:

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Results are presented of a search for heavy particles decaying into two photons. The analysis is based on a 19.7fb-1 sample of proton-proton collisions at $\sqrt{s}$ = 8 TeV collected with the CMS detector at the CERN LHC. The diphoton mass spectrum from 150 to 850 GeV is used to search for an excess of events over the background. The search is extended to new resonances with natural widths of up to 10% of the mass value. No evidence for new particle production is observed and limits at 95% confidence level on the production cross section times branching fraction to diphotons are determined. These limits are interpreted in terms of two-Higgs-doublet model parameters.

The Diphoton Production Rate in {bar P}p Collisions at (square Root)s
The Diphoton Production Rate in {bar P}p Collisions at (square Root)s

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Publisher:

Published: 1994

Total Pages: 5

ISBN-13:

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A measurement of the rate of prompt diphoton production in {bar p}p collisions at (square root)s = 1800 GeV using the CDF detector is presented. The background from non-prompt sources is estimated using a sample of single photon candidate events. The results are compared to a next-to-leading order calculation by Bailey, et al. Both background and signal take on particular significance as an indicator of our ability to estimate the backgrounds affecting LHC low mass Higgs to diphoton searches.