houches.tex
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\begin{flushright}
PM/00--03\\
February 2000 
\end{flushright}

\begin{center}
\vspace*{.5cm}

{\Large\sc \bf THE HIGGS WORKING GROUP: }

\vspace*{0.4cm}

{\Large\sc \bf Summary Report} 

\vspace*{1.cm} 

Conveners: \\[0.2cm] 
{\sc A. Djouadi$^1$, R. Kinnunen$^2$, E. Richter--W\c{a}s$^{3,4}$ and H.U. 
Martyn$^5$}


\vspace*{0.6cm}

 Working Group: \\[0.2cm]
{\sc 

K.A.~Assamagan$^6$, 
C.~Bal\'azs$^7$, 
G.~B\'elanger$^8$, 
E.~Boos$^9$, 
F.~Boudjema$^8$,
M.~Drees$^{10}$,
N.~Ghodbane$^{11}$, 
M.~Guchait$^5$, 
S.~Heinemeyer$^5$, 
V.~Ilyin$^{9}$,
J.~Kalinowski$^{12}$, 
J.L.~Kneur$^1$, 
R.~Lafaye$^8$, 
D.J.~Miller$^5$, 
S.~Moretti$^{13}$,
M.~M\"uhlleitner$^5$,  
A.~Nikitenko$^{2,3}$, 
K.~Odagiri$^{13}$, 
D.P.~Roy$^{14}$,
M.~Spira$^{15}$,
K.~Sridhar$^{14}$ and
D.~Zeppenfeld$^{16,17}$.
}

\vspace*{1.cm}

{\small

$^1$ LPMT, Universit\'e Montpellier II, F--34095 Montpellier Cedex 5, France.\\
%
$^2$ Helsinki Institute of Physics, Helsinki, Finland. \\
%
$^3$ CERN, IT Division, 1211 Geneva 23, Switzerland. \\
%
$^4$ Institute of Computer Science, Jagellonian University,  
and Institute of Nuclear Physics, \\ 30--059 Krakow, ul. Nawojki 26a, Poland. \\
%
$^5$ DESY, Notkestrasse 85, D--22603 Hamburg, Germany. \\
%
$^6$ Hampton University, Hampton, VA 23668, USA. \\
%
$^7$ Department of Physics and Astronomy, University of Hawaii, Honolulu, 
HI 96822. \\
%
$^8$ LAPP, BP 110, F--74941 Annecy le Vieux Cedex, France. \\
%
$^{9}$ Institute of Nuclear Physics, MSU, 11 9899 Moscow, Russia. \\ 
%
$^{10}$ Physik Department, TU M\"unchen, James Franck Str., D--85748 Garching, 
Germany. \\
%
$^{11}$ IPNL, Univ. Claude Bernard, F--69622 Villeurbanne Cedex, France.\\
%
$^{12}$ Institute of Theoretical Physics, Warsaw University, PL--00681 Warsaw, 
Poland.  \\
%
$^{13}$ Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, U.K. \\
%
$^{14}$ Theoretical Physics Department, TIFR, Homi Bhabha Road, Bombay 400 
005, India. \\
$^{15}$ II. Inst. Theor. Physik, Universit\"at Hamburg, 
D--22761 Hamburg, Germany. \\
%
$^{16}$ CERN, Theory Division, CH--1211, Geneva, Switzerland. \\
%
$^{17}$ Department of Physics, University of Wisconsin, Madison, WI 53706, USA.
}

\vspace*{1cm}

{\it Report of the HIGGS working group for the Workshop \\[0.1cm]
``Physics at TeV Colliders", Les Houches, France 8--18 June 1999.}

\end{center} 

\newpage

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\vspace*{1cm} 
\begin{center}
{\bf \large CONTENTS} 
\end{center} 

\vspace*{0.8cm} 

\nn {\bf \ \ \ \ SYNOPSIS} \hfill 3 \\

\nn {\bf 1. Measuring Higgs boson couplings at the LHC} 
\hfill 4 \\[0.2cm] \hspace*{0.5cm}
D.~Zeppenfeld, R.~Kinnunen, A.~Nikitenko and E.~Richter--W\c{a}s. \\

\nn {\bf 2. Higgs boson production at hadron colliders at NLO} 
\hfill 20 \\[0.2cm] \hspace*{0.5cm}
C. Bal\'azs, A. Djouadi, V. Ilyin and M. Spira. \\


\nn {\bf 3. Signatures of Heavy Charged Higgs Bosons at the LHC}
\hfill 36 \\[0.2cm]  \hspace*{0.5cm}
K.A. Assamagan, A. Djouadi, M. Drees, M. Guchait, R. Kinnunen, 
J.L. Kneur, \\ \hspace*{0.5cm} 
D.J. Miller, S. Moretti, K. Odagiri and D.P. Roy. \\

\nn {\bf 4. Light stop effects and Higgs boson searches at the LHC.}
\hfill 54 \\[0.2cm]  \hspace*{0.5cm}
G.~B\'elanger, F.~Boudjema, A.~Djouadi, V.~Ilyin, 
J.L.~Kneur, S.~Moretti, \\ \hspace*{0.5cm} E. Richter--W\c{a}s and  
K.~Sridhar. \\

\nn {\bf 5. Double Higgs production at TeV Colliders in the MSSM}
\hfill 67 \\[0.2cm] \hspace*{0.5cm}
R. Lafaye, D.J. Miller, M. M\"uhlleitner and  S.~Moretti. \\

\nn {\bf 6. Programs and Tools for Higgs Bosons} 
\hfill 88 \\[0.2cm] \hspace*{0.5cm}
E. Boos, A. Djouadi, N. Ghodbane, S. Heinemeyer,
V. Ilyin, J. Kalinowski, \\ \hspace*{0.5cm} J.L. Kneur and M. Spira. 

\newpage

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\begin{center}
{\large\sc {\bf SYNOPSIS}} 
\end{center}

\vspace*{0.1cm}

During this Workshop, the Higgs working group has addressed the prospects 
for searches for Higgs particles at future TeV colliders [the Tevatron RunII, 
the LHC and  a future high--energy $e^+e^-$ linear collider] in the context 
of the Standard Model (SM) and its supersymmetric extensions such as the 
Minimal Supersymmetric Standard Model (MSSM).  

In the past two decades, the main focus in Higgs physics at these colliders
was on the assessment of the discovery of Higgs particles in the simplest 
experimental detection channels. A formidable effort has been devoted to 
address this key issue, and there is now little doubt that a Higgs particle 
in both the SM and the MSSM cannot escape detection at the LHC or at the
planed TeV linear $e^+e^-$ colliders.  

Once Higgs particles will be found, the next important step and challenge would
be to make a detailed investigation of their fundamental properties and to
establish in all its facets the electroweak symmetry breaking mechanism.  To
undertake this task, more sophisticated analyses are needed since for instance,
one has to include the higher--order corrections [which are known to be rather
large at hadron colliders in particular] to the main detection channels to
perform precision measurements and to consider more complex Higgs production
and decay mechanisms [for instance the production of Higgs bosons with other
particles, leading to multi--body final states] to pin down some of the Higgs
properties such as the self--coupling or the coupling to heavy states.  

We have addressed these issues at the Les Houches Workshop and initiated a few 
theoretical/experimental analyses dealing with the measurement of Higgs boson
properties and higher order corrections and processes. This report summarizes 
our work.  

The first part of this report deals with the measurements at the LHC of the SM
Higgs boson couplings to the gauge bosons and heavy quarks. In part 2, the
production of the SM and MSSM neutral Higgs bosons at hadron colliders,
including the next--to--leading order QCD radiative corrections, is discussed.
In part 3, the signatures of heavy charged Higgs particles in the MSSM are
analyzed at the LHC. In part 4, the effects of light top squarks with large
mixing on the search of the lightest MSSM Higgs boson is analyzed at the LHC. 
In part 5, the double Higgs production is studied at hadron and $e^+e^-$
colliders in order to measure the trilinear Higgs couplings and to reconstruct 
the scalar potential of the MSSM. Finally, part 6 summarizes the work performed
on the programs and tools which allow the determination of the Higgs boson decay
modes and production cross sections at various colliders.  \bigskip

%Abdelhak Djouadi (for the Working Group). \bigskip

\noindent {\bf Acknowledgements}: \smallskip

\noindent We thank the organizers of this Workshop, and in particular ``le
Grand Ordonateur" Patrick Aurenche, for the warm, friendly and very stimulating
atmosphere of the meeting.  We thank also our colleagues of the QCD and SUSY
working groups for the nice and stimulating, strong and super, interactions
that we had.  Thanks also go to the ``personnel" of the Les Houches school for
allowing us to do physics late at night and for providing us with a hospitable
environment for many hot or relaxed discussions.  

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