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    High Precision for Hard Processes at the LHC

    6โ€“8 Sept 2006
    ETH Zurich
    Europe/Zurich timezone

    Contribution List

    43 out of 43 displayed
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    1. 1. Road to the LHC: passing by the Tevatron
      Joey Huston (Michigan)
      06/09/2006, 09:00
    2. 9. Latest results from MC@NLO
      Bryan Webber (Cambridge)
      06/09/2006, 09:40
    3. 8. The Unitarity Bootstrap for QCD Loop Amplitudes
      David Kosower (Saclay)
      06/09/2006, 10:05
    4. 7. Higgs+dijets production at NLO with semi-numerical methods
      Giulia Zanderighi (CERN)
      06/09/2006, 11:00
    5. 13. Can we find a computationally efficient loop algorithm?
      Giampiero Passarino (Torino)
      06/09/2006, 11:25
      Even disregarding the intrinsic necessity of some new algorithm for numerical evaluation of one-loop diagrams, and even in case it has no intrinsic necessity at all, a probable decision about its goodness is possible inductively by studying its success. Success here means fruitfulness in consequences, in particular in verifiable consequences, i.e., consequences demonstrable without the...
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    6. 14. Precise predictions for the Higgs-boson decay H -> WW/ZZ -> 4 fermions
      Ansgar Denner (PSI Zurich)
      06/09/2006, 11:50
      The decay of the Standard Model Higgs boson into four fermions via a virtual W-boson or Z-boson pair is one of the most important decay modes in the Higgs-boson search at the LHC. We present a calculation of the first order radiative corrections to these processes, including higher order improvements. The intermediate W- and Z-boson resonances are consistently described using the...
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    7. 15. Numerical evaluation of one-loop amplitudes
      David Soper (Oregon)
      06/09/2006, 14:00
    8. 4. Automated QCD calculations at NLO
      Stefan Weinzierl (Mainz)
      06/09/2006, 14:25
      I will discuss various technical aspects related to automated QCD calculations at NLO: - the recursive calculation of amplitudes, - the organization of the colour structures, - the automated generation of subtraction terms, - the numerical tensor reduction of loop integrals.
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    9. 2. Unitarity Cuts and QCD Loop Amplitudes
      Ruth Britto (Amsterdam)
      06/09/2006, 14:50
    10. 3. Loop amplitudes from MHV diagrams (I)
      Gabriele Travaglini (Queen Mary)
      06/09/2006, 15:35
    11. 10. Exclusive Drell-Yan production at NN LO
      William Kilgore (Brookhaven)
      06/09/2006, 16:00
      I describe a parton-level Monte Carlo calculation of Drell-Yan production at next-to-next-to-leading order. The calculation is performed with a subtraction scheme in which the subtraction term is the squared matrix element itself.
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    12. 11. Status of NNLO corrections to e+e- -> 3j
      Thomas Gehrmann (Uni Zurich)
      06/09/2006, 16:25
    13. 5. Computing one-loop amplitudes at the integrand level
      Roberto Pittau (Torino)
      06/09/2006, 17:10
      We show how to extract the coefficients of the 4-, 3-, 2- and 1-point one-loop scalar integrals from the full one-loop amplitude of arbitrary scattering processes. In a similar fashion, also the rational terms can be derived. Basically no information on the analytical structure of the amplitude is required, making our method appealing for an efficient numerical implementation.
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    14. 12. Higgs Production via Gluon Fusion: QCD corrections to Squark Loops
      Michael Spira (PSI)
      06/09/2006, 17:35
      The loop-induced processes gg -> h,H,A provide the dominant Higgs boson production mechanisms at the Tevatron and LHC in a large range of the minimal supersymmetric extension of the Standard Model. For squark masses below ~400 GeV squark loop contributions become important in addition to the top and bottom quark loops. The two-loop QCD corrections to the squark contributions of these...
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    15. 6. QCD corrections to vector-boson fusion processes
      Carlo Oleari (Bicocca, Milano)
      06/09/2006, 18:00
    16. 16. Prospects for measurements of hard scattering processes at the LHC
      Guenther Dissertori (ETH Zurich)
      07/09/2006, 09:00
      After a very brief report on the status of the LHC preparations (machine and detectors) I will try to summarize the current understanding of how well specific hard scattering processes can be measured at the LHC, and what the relevance of these measurements is. Examples are the Drell-Yan process, top production, W/Z + jet as well as inclusive jet production.
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    17. 23. PDF issues at LHC
      W. James Stirling (Durham)
      07/09/2006, 09:40
    18. 26. The two-loop anomalous dimension matrix for soft gluon exchange
      Lance Dixon (SLAC)
      07/09/2006, 10:05
      Resummation of soft-gluon exchange for QCD hard scattering requires an anomalous dimension matrix in color space. We compute this matrix directly for arbitrary massless processes for the first time at two loops, and show that it is proportional to the one-loop matrix. This result reproduces the 1/eps pole terms in previous explicit two-loop computations, and predicts such terms for...
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    19. 28. Recent progress in splitting functions
      Sven Moch (DESY Zeuthen)
      07/09/2006, 11:00
    20. 27. Multi-loop parton distributions for large and small x
      Giuseppe Marchesini (Bicocca, Milano)
      07/09/2006, 11:25
    21. 29. NLO + Shower: a new approach
      Paolo Nason (Bicocca, Milano)
      07/09/2006, 11:50
    22. 17. Techniques for one-loop tensor integrals in many-particle processes
      Stefan Dittmaier (MPI, Munich)
      07/09/2006, 14:00
      In the calculation of NLO corrections to multi-leg processes serious numerical problems arise in the commonly used Passarino-Veltman reduction of tensor to scalar integrals in exceptional phase-space configurations. In this talk two alternative methods are discussed solving this problem. One of the methods relies on a seminumerical approach, in which a specific tensor coefficient is...
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    23. 18. Higgs + 2 jet signals from gluon fusion
      Dieter Zeppenfeld (Karlsruhe)
      07/09/2006, 14:25
    24. 0. Recursive equations for arbitrary scattering processes
      Costas Papadopoulos (Demokritos Athens)
      07/09/2006, 14:50
    25. 20. NLO corrections to $pp/pbar p to tbar t + jet + X$
      Peter Uwer (CERN)
      07/09/2006, 15:35
    26. 21. Threshold resummation for high-transverse-momentum Higgs production
      Daniel de Florian (Buenos Aires)
      07/09/2006, 16:00
      We perform the all-order resummation of large logarithmic(NLL) QCD corrections for the process pp ->H+ X when the Higgs boson H is produced at high transverse momentum.
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    27. 25. The GOLEM project: status and applications
      Thomas Binoth (Edinburgh)
      07/09/2006, 16:25
      In this talk I review the status of our GOLEM project. The acronym stands for "General One-Loop Evaluator of Matrix-elements". This tool is designed to allow for an efficient and numerically stable evaluation of multi-particle one-loop amplitudes which are needed for the precise description of numerous processes relevant for the upcoming LHC. First applications are presented.
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    28. 22. Soft-gluon effects in WW production at hadron colliders
      Massimiliano Grazzini (INFN, Firenze)
      07/09/2006, 17:10
    29. 24. Madgraph beyond the Standard Model
      Tilman Plehn (Edinburgh)
      07/09/2006, 17:35
      Madgraph and Madevent are a well established tool to evaluate tree-level amplitudes and create unweighted events for processes with a large number of external particles at the LHC. For the Madgraph collaboration I review the status, some physics complications and recent calculations of Madgraph/Madevent for physics beyond the Standard Model.
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    30. 30. Beyond the Standard Model Physics at the LHC
      Alex Pomarol (Barcelona)
      08/09/2006, 09:00
    31. 37. The dipole-antenna approach to shower monte carlo's
      Walter Giele (Fermilab)
      08/09/2006, 09:40
    32. 36. A new method to compute multileg one-loop cross sections
      Stefano Catani (INFN, Firenze)
      08/09/2006, 10:05
    33. 39. Twistor Inspired Higgs Phenomenology
      Nigel Glover (Durham)
      08/09/2006, 11:00
      We discuss how the twistor inspired methods can be used to derive compact expressions for multi-parton amplitudes involving Higgs bosons (in the limit that the top quark mass is heavy producing an effective Higgs-gluon interaction).
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    34. 40. Loop amplitudes from MHV diagrams (II)
      Andreas Brandhuber (Queen Mary)
      08/09/2006, 11:25
    35. 41. Reduction with spinor formalism
      Bo Feng (Imperial College)
      08/09/2006, 11:50
    36. 31. All-multiplicity amplitudes in QCD
      Darren Forde (Saclay)
      08/09/2006, 14:00
      I will discuss the construction of amplitudes at one-loop in QCD using the unitarity bootstrap approach. I will detail the techniques needed to build the rational contributions to these amplitudes as well as highlighting not only their application to fixed-multiplicity amplitudes but also to all-multiplicity amplitudes.
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    37. 32. The Rational Part of QCD Amplitudes
      Chuan-jie Zhu (Beijing)
      08/09/2006, 14:25
    38. 42. On the IR singularities of massive QCD amplitudes beyond one loop
      Alexander Mitov (DESY Zeuthen)
      08/09/2006, 14:50
    39. 33. A subtraction scheme for cross sections at NNLO
      Vittorio del Duca (INFN, Torino)
      08/09/2006, 15:35
    40. 34. Towards event shapes by NNLO subtraction
      Gabor Somogyi (Debrecen)
      08/09/2006, 16:00
    41. 38. Techniques and Results for Supergravity Calculations
      David Dunbar (Swansea)
      08/09/2006, 16:25
      The recent progress for calculating gauge theory amplitudes may also be applied to gravity calculations. We find surprising similarities between the perturbative expansions of maximally supersymmetric Yang-Mills and gravity theories. We discuss possible implications of these results for the UV behaviour of supergravity in D=4.
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    42. 35. Prospects for the Future
      Zvi Bern (UCLA)
      08/09/2006, 17:10
    43. 19. Computing one-loop amplitudes at the integrand level
      Roberto Pittau (Torino)
      We show how to extract the coefficients of the 4-, 3-, 2- and 1-point one-loop scalar integrals from the full one-loop amplitude of arbitrary scattering processes. In a similar fashion, also the rational terms can be derived. Basically no information on the analytical structure of the amplitude is required, making our method appealing for an efficient numerical implementation
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