Dear Colleagues,

the deadline for submitting abstracts to ICHEP in Valencia is approaching fast. It would be good if there are many interesting talks at ICHEP about the prospects for physics at Linear Colliders. Following a task given by the LCC, the seven of us have prepared five abstracts on general linear collider physics topics, given below.

These are two abstracts on Higgs physics at ILC, one abstract on BSM physics at ILC and two abstracts on top physics combined for ILC and CLIC. CLICdp will submit abstracts on Higgs and BSM physics at CLIC.

The selection of speakers for these talks will be discussed once we know the outcome from the conference organizers.

In addition to these overview talks, you are of course free and encourage to request a talk at ICHEP on your work. In case such an abstract deals with Linear Collider physics, we would be grateful if you would email us that abstract such that we can appropriately promote it within the community. 

Comments and suggestions to the proposed abstracts are appreciated, please send them by Friday this week (April 18). 

Thank you very much.

Best regards,

Ivanka Bozovic-Jelisavcic, Juan Fuster, Christophe Grojean, Akiya Miyamoto, Michael Peskin, Frank Simon, Andy White


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Measurement of Higgs Boson Couplings at the International Linear Collider

One of the key topics in the physics program of the ILC is the precision measurement of the couplings of the Higgs boson.  At linear colliders, Higgs bosons are produced singly in association with Z bosons and by W boson fusion.  In both processes, the backgrounds to Higgs production are relatively small, and all major Higgs boson decay modes can be observed.  The Zh process gives tagged Higgs bosons, allowing measurement of absolute branching ratios and the observation of invisible and other exotic decays.   The W fusion process gives high rates for precision measurement and allows the model-independent determination of the Higgs boson width and the individual Higgs couplings.  This contribution will report the current status of this program, with results from full-simulation studies of Higgs processes in the detectors proposed for the ILC.


Measurement of the Higgs Boson Coupling to the Top Quark and the Higgs Boson Self-Coupling at ILC

At center of mass energies of 500 GeV and above, e+e- collisions lead to processes in which the Higgs boson is radiated from top quarks and antiquarks and events in which two Higgs bosons are produced.  The first of these processes leads to a precision measurement of the Higgs boson coupling to top quarks, the second to a measurement of the Higgs boson self-coupling.  The rates of these processes are small, but linear colliders offer many tools to extract the signal processes from background, including highly efficient flavor tagging, the full reconstruction of top-antitop systems, precise control of (3-dimensional) missing energy, control of initial beam polarization, and measurement of final-state polarization.  This contribution will report the current status of this program, with results from full-simulation studies of these processes in the detectors proposed for the ILC.


Supersymmetry and Dark Matter at the International Linear Collider

Although the LHC experiments have put strong limits on colored supersymmetric states, it is still possible that electroweakly interacting supersymmetric particles have masses in the range 100-200 GeV. Even outside of supersymmetry, candidates for the particle of dark matter may have masses in this range unconstrained by LHC data. In e+e- annihilation, the low backgrounds, precise knowledge of the initial-state beams, and sensitivity to small energy depositions would allow not only the discovery but also precision measurement of such particles. This contribution will report the current status of studies for the prospects of measurements of light electroweak states at the International Linear Collider, with results from full-simulation studies of their production in the detectors proposed for the ILC.


Measurement of the Top Quark Mass at Linear Colliders

The future precision studies of the Standard Model require excellent knowledge of the top quark mass, to an accuracy of 100 MeV or better.  This mass can be measured in a way that is free of any ambiguities from soft QCD by locating the threshold position for e+e- annihilation to top quarks, or, more precisely, the mass of the unstable 1S resonance.  The measurement requires a combination of precise QCD calculations, excellent detection efficiency and recognition of top quark events, and excellent control of the initial beam energy and profile.  This contribution will report the current status of this program, with results from full-simulation studies of measurements of the top quark threshold in the detectors proposed for ILC and CLIC.


Measurement of Top Quark Couplings at Linear Colliders

Models in which the Higgs boson is composite or strongly interacting typically predict modifications of the coupling of the top quark to vector bosons and, in particular, to the Z boson.  The production of the top quarks at e+e- colliders goes through the top quark couplings to the photon and the Z.  Thus, precision studies of this pair production process, including its full dependence on electron and top quark polarization, has the potential to extract the form factors for the top quark couplings with high precision and in a model-independent way. This contribution will report the current status of this program, with results from full-simulation studies of top quark pair production in the detectors proposed for ILC and CLIC.





<=========================================================> 
Frank Simon 

Max-Planck-Institut fuer Physik 

Phone: 	+49-89-32354-535 
Mobile: 	+49-160-90446142    
<=========================================================> 

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