Theory Summary of the SM and NLO Multi-leg WG
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1 Theory Summary of the SM and NLO Multi-leg WG Departamento de Física Teórica y del Cosmos Universidad de Granada Les Houches June 17th 2009
2 Theory Summary of the SM and NLO Multi-leg WG Departamento de Física Teórica y del Cosmos Universidad de Granada Les Houches June 17th 2009 Theorists talking to Experimentalists
3 Theory Summary of the SM and NLO Multi-leg WG Departamento de Física Teórica y del Cosmos Universidad de Granada Les Houches June 17th 2009 Theorists talking to Experimentalists Theorists talking to Theorists
4 Theory Summary of the SM and NLO Multi-leg WG Departamento de Física Teórica y del Cosmos Universidad de Granada Les Houches June 17th 2009 Theorists talking to Experimentalists Theorists talking to Theorists Standardization
5 The Subgroups Observables Higgs phenomenology New HO ((N)NLO) calculations/wish list NLO techniques/standardization/automation NLO+parton shower (jointly with the MC group)
6 Theoretical Calculations (N)NLO W/Zb b (Laura Reina) V BFNLO (Dieter Zeppenfeld) ZZj (Nikolas Kauer) t th, ttj, Wj (NLO+EW) (Stefan Dittmaier) W + 3j, BlackHat+Sherpa (Darren Forde) W + 3j, MCFM+ROCKET (Giulia Zanderighi) t tb b (Stefano Pozzorini) gg H QCD-EW (Radja Boughezal) H WW/ZZ 4f O(α) and O(α s ) (Marcus Weber) H W W llνν at NNLO (Guenther Dissertori) X + n j matching BFKL with exact results (Jeppe Andersen)
7 Some issues that have been discussed Jet veto reduces the K factor it is important to perform detailed studies with NLO codes (e.g. Wb b in the WH region, Ht t and t tb b) The right scale of the process can only be confirmed after the actual NLO calculation has been performed (e.g t tb b). Can the Ht t channel be used to determine the Higgs Yukawa couplings? Mixed QCD-EW corrections gg H relevant to settle the Tevatron exclusion limits 160GeV < M H < 170GeV Need of codes with complete NLO QCD and EW corrections for final states with photons (e.g. Wγ) Comparisons of BlackHat+Sherpa and MCFM+ROCKET on a common set of Observables/Distributions would be useful
8 The NNLO (Sub)Subgroup Methods for NNLO Calculations, antenna subtraction and sector decomposition (Gudrun Heinrich) e + e 3jets (Stefan Weinzierl) α s from nnlo/nnla matching (Guenther Dissertori) Towards pp W W at NNLO (Grigorios Chachamis) EW corrections to gg H, H γγ (Giampiero Passarino) First attempts to extend the one-loop duality method to two loops (Isabella Bierenbaum)
9 Some issues that have been discussed Catani-Seymour versus Antenna subtraction Why α s was systematically higher in some LEP measurements Is the 2 loop technology ready for a complete 2 2 EW calculation? Complex pole to study external particles in a gauge invariant way?
10 Updating the 2007 Les Houches wish list Question: Do we need a new wish list?
11 Updating the 2007 Les Houches wish list Question: Do we need a new wish list? Answer: We wish a need list!
12 Updating the 2007 Les Houches wish list Question: Do we need a new wish list? Answer: We wish a need list! Outcome: Add a column in the 2007 Les Houches wish list, with the precision needed by the experimentalists Theorists will then decide whether, for example, EW corrections should be included as well Joey Huston s proposal for a gentlemen s agreement to properly include decays (including spin correlations) in the processes listed in the 2007 wish list A limited numbers of new processes to be computed at NLO could be added, such as tttt Z + 3j Wbbj (massive b) W + 4j
13 NLO technique and Automation Feynmanians versus Unitarians (J. Huston) Techniques with Feynman diagrams, t tb b (Stefano Pozzorini) GOLEM (Thomas Reiter) OPP and Rational terms (Maria Vittoria Garzelli) BlackHat + Sherpa (Daniel Maitre)
14 Unitarity methods Soft singularities at all orders (Lorenzo Magnea) Generalized Unitarity and masses, analytic approach (Simon Badger) Automating d-dimensional Unitarity, numerical approach (Achilleas Lazopoulos) Numerical calculation of 1-loop amplitudes (Jan Winter) Generalized Unitarity and W + 3jets (Giulia Zanderighi) Progress in analytic results (Ruth Britto) Double-Cut, Stokes Theorem and Berry s Phase (Pierpaolo Mastrolia)
15 Some issues that have been discussed Analytic approach versus Numerical approach The numerical stability of the Unitarity Methods The problem of the Gram determinants What is the most time consuming part of the calculation? Efficiency in getting the Rational Part of the Amplitude
16 Towards a Les Houches Accord to merge Real (R) and Virtual (V) Corrections Contributions from T. Binoth, S. Dittmaier, G. Heinrich, N. Kauer, D. Kosower, D. Maitre, F. Maltoni, T. Reiter, G. Passarino, P. Skands Monte Carlo (R) One Loop Engine (V) Contract A draft of the proposal for can be found in
17 NLO/PS Matching The POWHEG Method (Carlo Oleari) Proposal of Leif Lonnblad for matching NLO and Parton Shower by consistently subtracting terms O(α s ) from the sudakov and by adding σ NLO
18 Some issues that have been discussed Modifying the LHEF v2.0 to allow the merging of NLO results with the parton shower Adding information such as max weight and cuts Grouping the events in eventgroups more details in for Matching
19 More Standards? Automation of Dipole Subtraction MadDipole as a building block (Nicolas Greiner) Standard output of NLO programs Common ROOT tree output for NLO programs in C++ (Joanna Weng) Using ROOT/ntuples as a standard output of NLO programs (Joey Huston)
20 Conclusions In the last 2 years, a tremendous progress in our capability of computing NLO Multi-Leg processes took place
21 Conclusions In the last 2 years, a tremendous progress in our capability of computing NLO Multi-Leg processes took place Our final task is developing a set of NLO tools to be able to analyze the whole set of the LHC data at least at at the NLO accuracy, including a correct matching with Parton Shower
22 Conclusions In the last 2 years, a tremendous progress in our capability of computing NLO Multi-Leg processes took place Our final task is developing a set of NLO tools to be able to analyze the whole set of the LHC data at least at at the NLO accuracy, including a correct matching with Parton Shower To this end, a coherent effort is needed, to standardize and modularize all building blocks of the complete calculation, in such a way different parts can be attacked by different groups, making a matching effort to avoid double or multiple counting
23 Conclusions In the last 2 years, a tremendous progress in our capability of computing NLO Multi-Leg processes took place Our final task is developing a set of NLO tools to be able to analyze the whole set of the LHC data at least at at the NLO accuracy, including a correct matching with Parton Shower To this end, a coherent effort is needed, to standardize and modularize all building blocks of the complete calculation, in such a way different parts can be attacked by different groups, making a matching effort to avoid double or multiple counting A general consensus for a standard interface between MCs and OLEs seems to be at reach
24 Conclusions In the last 2 years, a tremendous progress in our capability of computing NLO Multi-Leg processes took place Our final task is developing a set of NLO tools to be able to analyze the whole set of the LHC data at least at at the NLO accuracy, including a correct matching with Parton Shower To this end, a coherent effort is needed, to standardize and modularize all building blocks of the complete calculation, in such a way different parts can be attacked by different groups, making a matching effort to avoid double or multiple counting A general consensus for a standard interface between MCs and OLEs seems to be at reach It is time to end the religious war between Feynmanians and Unitarians. We must now start signing Contracts to produce accurate predictions for LHC Physics
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