17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Measuring the Higgs boson properties with unprecedented precision at TLEP

20 Jul 2013, 09:45
F1 (KTH Campus)


KTH Campus

Talk presentation Higgs and New Physics Higgs and New Physics


Michail Bachtis (CERN)


After the Higgs boson discovery by the CMS and ATLAS experiments at 126 GeV, Higgs factory concepts get a lot of attention towards a detailed study of the properties of this remarkable particle. TLEP is a high-luminosity circular ee collider to be fit in an 80-100 km tunnel as precursor and companion of a 100-TeV pp collider (VHE-LHC), as part of a possible long-term vision for High-Energy Physics. The machine covers the energy range from the Z pole up to above the top quark pair threshold. The luminosity at √s = 240GeV (Higgs factory) is 5.1034 /cm2/s at each of four collision points, yielding 2 Million Higgs decays in 5 years through the e+e-  ZH process. This sample opens the possibility of sub-per-cent precision measurement of the Higgs boson couplings to light fermions and to gauge-bosons, and of the Higgs boson width. These precision measurements are sensitive to multi-TeV new physics interacting with the scalar sector. The ZH production mechanism also gives access to the invisible or exotic branching ratios down to a few per mil. The luminosity expected at the top pair production threshold (√s ~ 340-350 GeV) further improves some of these figures by a factor of two, and is sensitive to the Higgs boson coupling to the top quark. Besides the direct search for new physics up to a scale of several tens of TeV, the upgrade to VHE-LHC allows the measurement of the Higgs boson coupling to the top quark and the triple Higgs-boson self-coupling to the per-cent and few per-cent levels, respectively, hence completing the Higgs boson study with unrivaled precision.

Primary author


Alain Blondel (Universite de Geneve (CH)) Dr Frank Zimmermann (CERN) Jonathan R. Ellis (CERN) Marco Zanetti (Massachusetts Inst. of Technology (US)) Dr Roy Aleksan (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) m Koratzinos (Universite de Geneve (CH))

Presentation Materials