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Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report

G. Brooijmans, R. Contino, B. Fuks, F. Moortgat, P. Richardson, S. Sekmen, A. Weiler, A. Alloul, A. Arbey, J. Baglio, D. Barducci, A. J. Barr, L. Basso, M. Battaglia, G. Bélanger, A. Belyaev, J. Bernon, A. Bharucha, O. Bondu, F. Boudjema, E. Boos, M. Buchkremer, V. Bunichev, G. Cacciapaglia, G. Chalons, E. Conte, M. J. Dolan, A. Deandrea, K. De Causmaecker, A. Djouadi, B. Dumont, J. Ellis, C. Englert, A. Falkowski, S. Fichet, T. Flacke, A. Gaz, M. Ghezzi, R. Godbole, A. Goudelis, M. Gouzevitch, D. Greco, R. Grober, C. Grojean, D. Guadagnoli, J. F. Gunion, B. Herrmann, J. Kalinowski, J. H. Kim, S. Kraml, M. E. Krauss, S. Kulkarni, S. J. Lee, S. H. Lim, D. Liu, F. Mahmoudi, Y. Maravin, A. Massironi, L. Mitzka, K. Mohan, G. Moreau, M. M. Mühlleitner, D. T. Nhung, B. O'Leary, A. Oliveira, L. Panizzi, D. Pappadopulo, S. Pataraia, W. Porod, A. Pukhov, F. Riva, J. Rojo, R. Rosenfeld, J. Ruiz-Álvarez, H. Rzehak, V. Sanz, D. Sengupta, M. Spannowsky, M. Spira, J. Streicher, N. Strobbe, A. Thamm, M. Thomas, R. Torre, W. Waltenberger, K. Walz, A. Wilcock, A. Wulzer, F. Würthwein, C. Wymant

TL;DR

The Les Houches 2013 New Physics Working Group report surveys developments in Higgs- and beyond-Standard-Model phenomenology at TeV colliders, emphasizing new computational tools (HDECAY,eHDECAY,NMSSMCALC) and their role in interpreting the Higgs discovery. It showcases how the Higgs boson can be used to probe naturalness, CP violation, and flavor structure, including vector-boson scattering, top-Higgs interactions, and dark matter interplay. The document presents concrete studies on Higgs coupling fits (custodial symmetry, CP admixtures), VV scattering as a probe of HVV couplings, and non-resonant/resonant di-Higgs production in composite Higgs and RS-like scenarios, detailing methods, predictions, and HL-LHC prospects. Collectively, these contributions provide a framework for constraining or signaling new physics at the LHC and future colliders via precise Higgs-sector analyses and di-Higgs channels, highlighting both the power and the limitations of current methodologies.

Abstract

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC.

Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report

TL;DR

The Les Houches 2013 New Physics Working Group report surveys developments in Higgs- and beyond-Standard-Model phenomenology at TeV colliders, emphasizing new computational tools (HDECAY,eHDECAY,NMSSMCALC) and their role in interpreting the Higgs discovery. It showcases how the Higgs boson can be used to probe naturalness, CP violation, and flavor structure, including vector-boson scattering, top-Higgs interactions, and dark matter interplay. The document presents concrete studies on Higgs coupling fits (custodial symmetry, CP admixtures), VV scattering as a probe of HVV couplings, and non-resonant/resonant di-Higgs production in composite Higgs and RS-like scenarios, detailing methods, predictions, and HL-LHC prospects. Collectively, these contributions provide a framework for constraining or signaling new physics at the LHC and future colliders via precise Higgs-sector analyses and di-Higgs channels, highlighting both the power and the limitations of current methodologies.

Abstract

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC.

Paper Structure

This paper contains 39 sections, 60 equations, 26 figures, 6 tables.

Table of Contents

  1. Updates and Extensions of the Program HDECAY
  2. INTRODUCTION
  3. UPDATES
  4. eHDECAY - a Fortran Code for the Computation of Higgs Decays in the Effective Lagrangian Approach
  5. INTRODUCTION
  6. HIGHER ORDER CORRECTIONS AND MASS EFFECTS
  7. NMSSMCALC - a Fortran Package for Higher Order Higgs Boson Masses and Higgs Decay Widths in the Real and the Complex NMSSM
  8. INTRODUCTION
  9. PROGRAM DESCRIPTION
  10. SUSY CORRECTIONS TO FERMIONIC DECAYS
  11. HIGGS BOSON PHENOMENOLOGY
  12. The Theoretical Uncertainties in Higgs Signal Strength Fits
  13. INTRODUCTION
  14. Likelihood function and theoretical uncertainties
  15. Numerical results
  16. ...and 24 more sections

Figures (26)

  • Figure 1: Left: Higgs boson masses $M_{H_2}$ (red/light grey) and $M_{H_3}$ (blue/dark grey) as function of $\mathrm{Im}(\kappa)$ at LO (dashed) and NLO (full). Right: The amount of CP-violation $r^i_{\mathrm{CP}}$ for $H_2$ (red/light grey) and $H_3$ (blue/dark grey) as function of $\mathrm{Im} (\kappa)$.
  • Figure 2: The $68.27\%$, $95.45\%$, $99.73\%$ confidence level (CL) (from marginalized frequentist likelihoods) and Bayesian credible (from posteriors) regions are shown respectively as colored regions and contour levels in the $(c_V,c_f)$ plane. The green point is the frequentist best-fit location. Left and right panels respectively correspond to the flat and Gaussian prior case. The SM prediction point is also displayed [in red].
  • Figure 3: Left plot: Fit of $C_V$ and $C_F$. The dashed lines are the 68% and 95.4% CL contours as reported by the CMS collaboration in Fig. 6 of Ref. CMS-PAS-HIG-13-005, while the red, orange and yellow regions are the 68%, 95.4% and 99.7% CL regions of our fit. Middle plot: Fit of $C_{WZ}$ while $C_Z$ and $C_F>0$ are profiled over with comparison to the CMS fit, Fig. 7 of Ref. CMS-PAS-HIG-13-005. Right plot: Fit of $C_{WZ}$ while $C_Z$ and $C_F$ are profiled over with comparison to the ATLAS fit, Fig. 11 of Ref. Aad:2013wqa.
  • Figure 4: $C_W, C_Z$ fit assuming $C_U=C_D=1$ (left) and varying $C_U, C_D>0$ (right). The red, orange and yellow regions are respectively the 68%, 95.4%, and 99.7% CL regions. The white point shows the SM expectation while the yellow triangle shows the best-fit point: ($C_W=0.980,\, C_Z=1.102$) (left) and ($C_W=1.061,\, C_Z=1.143$) (right).
  • Figure 5: 1-dimensional fit of $C_{WZ}$ for three different choices of fermionic couplings; when free, $C_U$ and $C_D$ are profiled over.
  • ...and 21 more figures