Model-independent bounds on a light Higgs

A bstractWe present up-to-date constraints on a generic Higgs parameter space. An accurate assessment of these exclusions must take into account statistical, and potentially signal, fluctuations in the data currently taken at the LHC. For this, we have constructed a straightforward statistical method for making full use of the data that is publicly available. We show that, using the expected and observed exclusions which are quoted for each search channel, we can fully reconstruct likelihood profiles under very reasonable and simple assumptions. Even working with this somewhat limited information, we show that our method is sufficiently accurate to warrant its study and advocate its use over more naive prescriptions. Using this method, we can begin to narrow in on the remaining viable parameter space for a Higgs-like scalar state, and to ascertain the nature of any hints of new physics — Higgs or otherwise — appearing in the data.

[1]  A. Azatov,et al.  Light custodians and Higgs physics in composite models , 2011, 1110.5646.

[2]  L. Vecchi.  Phenomenology of a light scalar: the dilaton , 2010, 1002.1721.

[3]  B. Grinstein,et al.  Distinguishing the higgs boson from the dilaton at the large hadron collider. , 2008, Physical review letters.

[4]  M. Dührssen,et al.  Extracting Higgs boson couplings from CERN LHC data , 2004, hep-ph/0406323.

[5]  Georg Weiglein,et al.  HiggsBounds 2.0.0: Confronting neutral and charged Higgs sector predictions with exclusion bounds from LEP and the Tevatron , 2011, Comput. Phys. Commun..

[6]  M. Dührssen,et al.  Measuring the Higgs sector , 2009, 0904.3866.

[7]  Georg Weiglein,et al.  HiggsBounds: Confronting arbitrary Higgs sectors with exclusion bounds from LEP and the Tevatron , 2008, Comput. Phys. Commun..

[8]  C. Grojean,et al.  Composite Higgs under LHC Experimental Scrutiny , 2012, 1202.1286.

[9]  M. B. Gavela,et al.  Anomalous Higgs couplings at the LHC, and their theoretical interpretation , 2011, 1105.5140.

[10]  A. Azatov,et al.  Superconformal technicolor. , 2011, Physical review letters.

[11]  S. Rychkov,et al.  What if the Higgs couplings to W and Z bosons are larger than in the Standard Model? , 2012, 1202.1532.

[12]  Riccardo Barbieri,et al.  Electroweak symmetry breaking after LEP1 and LEP2 , 2004, hep-ph/0405040.

[13]  Takeuchi,et al.  Estimation of oblique electroweak corrections. , 1992, Physical review. D, Particles and fields.

[14]  M. Raidal,et al.  Has a fermiophobic Higgs boson been detected at the LHC , 2012, 1202.1796.

[15]  Howard Georgi,et al.  SU(2) × U(1) breaking by vacuum misalignment , 1984 .

[16]  T. Koi,et al.  Combined search for the Standard Model Higgs boson using up to 4.9 fb[superscript −1] of pp collision data at √s = 7 TeV with the ATLAS detector at the LHC , 2012 .

[17]  G. Cowan.  Statistical data analysis , 1998 .

[18]  C. Grojean,et al.  The Strongly-Interacting Light Higgs , 2007, hep-ph/0703164.

[19]  Howard Georgi,et al.  Calculation of the Composite Higgs Mass , 1984 .

[20]  V. M. Ghete,et al.  Combined results of searches for the standard model Higgs boson in pp collisions at √s = 7 TeV , 2012 .

[21]  G. Bruno,et al.  Search for the standard model Higgs boson decaying to W + W - in the fully leptonic final state in pp collisions at √{ s} = 7 TeV , 2012 .

[22]  M. B. Gavela,et al.  The Effective Chiral Lagrangian for a Light Dynamical "Higgs" , 2012, 1212.3305.

[23]  E. Halyo.  TECHNIDILATON OR HIGGS , 1993 .

[24]  A. Pomarol,et al.  Light custodians in natural composite Higgs models , 2006, hep-ph/0612048.

[25]  R. Rattazzi,et al.  Strong double higgs production at the LHC , 2010, 1002.1011.

[26]  H. Georgi,et al.  Composite Higgs and custodial SU(2) , 1984 .

[27]  M. Sher,et al.  Implications of the LHC two-photon signal for two-Higgs-doublet models , 2011, 1112.3277.

[28]  Giulio D'Agostini,et al.  BAYESIAN REASONING IN DATA ANALYSIS: A CRITICAL INTRODUCTION , 2003 .

[29]  M. Dührssen.  Prospects for the measurement of Higgs boson coupling parameters in the mass range from 110 - 190 GeV , 2003 .

[30]  V. M. Ghete,et al.  Search for the standard model Higgs boson decaying into two photons in $pp$ collisions at $\sqrt{s}=7$ TeV , 2012 .

[31]  R. Lafaye,et al.  Measuring Hidden Higgs and Strongly-Interacting Higgs Scenarios , 2010, 1007.2645.

[32]  M. Mühlleitner,et al.  Composite Higgs search at the LHC , 2010, 1003.3251.

[33]  J. Preskill,et al.  Massless Composites With Massive Constituents , 1982 .

[34]  J. Ellis,et al.  Phenomenology and cosmology of an electroweak pseudo-dilaton and electroweak baryons , 2011, 1111.4495.

[35]  A. Azatov,et al.  Superconformal technicolor: Models and phenomenology , 2011, 1106.4815.

[36]  Savas Dimopoulos,et al.  Composite Higgs scalars , 1984 .

[37]  R. Rattazzi,et al.  Theoretical constraints on the Higgs effective couplings , 2009, 0907.5413.

[38]  T. Banks.  Constraints on SU2×U1 breaking by vacuum misalignment , 1984 .

[39]  Jared A. Evans,et al.  Minimal conformal technicolor and precision electroweak tests , 2010, 1001.1361.

[40]  Roberto Contino,et al.  The Minimal Composite Higgs Model , 2005 .

[41]  Howard Georgi,et al.  Anatomy of a composite Higgs model , 1985 .

[42]  D. Re,et al.  Determining Higgs couplings with a model-independent analysis of h → γγ , 2012, 1204.4817.