Institute of Mathematics and Physics

CMS search for the Standard Model Higgs Boson in LHC data from 2010 and 2011
CMS preliminary results, exclude the existence of the Standard Model (SM) Higgs boson in a wide range of possible Higgs boson masses: 127 – 600 GeV at 95% confidence level. Compared to the SM prediction there is an excess of events in the mass region around 125GeV, that appears, quite consistently, in five independent channels. The excess is most compatible with an SM Higgs hypothesis in the vicinity of 124 GeV and below, but with a statistical significance of less than 2 standard deviations (2σ) from the known backgrounds, once the so-called Look-Elsewhere Effect has been taken into account.

First measurement of the exclusive muon pair production at the LHC
Three CP3 members made a novel study at the LHC. For the first time, the measurement of exclusive production of muon pairs has been performed in very demanding conditions of high event pileup (i.e. multiple interactions in one beam crossing). This opens the way for an original and precise luminosity measurement, as well as for unique studies of the high energy photon interactions at the LHC.

First observation of Z+b process at LHC
CP3 members contributed another prime measurement at LHC, with the early observation of the Z+b process at LHC. For the first time, the Z+bb candidates are also presented. This preliminary result is being shown at "Moriond 2011", the most important Winter conference in High Energy Physics.

First Single Top measurement at 7 TeV
After the first top-quark pair production cross section in November'10, CP3 contributes again to a first cross section measurement at 7 TeV, this time of single-top production in t-channel. This preliminary result is being shown at "Moriond 2011", the most important Winter conference in High Energy Physics. [Update, March 15]: article on Symmetry Magazine.

First CP3 CMS search paper accepted for publication by JHEP
The CMS paper "Search for Heavy Stable Charged Particles in pp collisions at sqrt(s)=7 TeV" has been accepted for publication by JHEP. This is an almost 100% CP3 paper. Only 3 papers before this one have been published by CMS (2100 authors) on searches for new physics.

Cover plot on the European Physical Journal: CMS dE/dx
The plot demonstrating the capability of CMS of identifying particles via the ionization energy loss measurement, fully developed by CP3 members, stands alone on the cover of the last issue of the European Physical Journal C

W+jets measurement at CMS compared with MadGraph predictions
Madgraph predictions on the production of W boson accompanied with jets match proton collision data taken by CMS at the LHC (CERN).

New two-particle correlations observed in CMS detector at the LHC

The CMS Collaboration at CERN released a paper entitled “Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions” that details signs of a new phenomenon in proton interactions.

A study of “high multiplicity” collisions, where a hundred or more charged particles are produced, has revealed indications that some particles are somehow “correlated” – associated together when they were created at the point of collision.

It was considered natural to search for these correlations in the highest multiplicity proton-proton collisions at LHC as the particle densities begin to approach those in high-energy collisions of nuclei such as copper, where similar effects have already been seen...

CP3 CMS results at ICHEP
Among the results presented by the CMS collaboration at ICHEP 2010, most important Summer conference in High Energy Physics, the first top quark candidate events at 7 TeV (shown in Figure: a dileptonic event with two secondary vertices attributed to the decays of b quarks) and an improved exclusion of long-lived gluinos as well as a measurement of the CMS Tracker material. CP3 gave a strong contribution to these achievements.

Sleeper field awoke to expand universe
The New Scientist magazine features research from C. Ringeval, T. Suyama (UCLouvain) and T. Takahashi, M. Yamaguchi and S. Yokoyama from Japan about dark energy (preprint available from arXiV).

According to their model and current cosmological observations, inflation should occur at the TeV scale, i.e. precisely in the LHC search area.