Jeppe Rosenkrantz Andersen

Publications (55) View all

• Article: Polishing a shiny Higgs with matrix elements

  Jeppe R. Andersen, Christoph Englert, Michael Spannowsky
  [show abstract] [hide abstract]
  ABSTRACT: After the recent discovery of a Standard Model Higgs boson-like particle at the LHC, the question of its couplings to known and unknown matter is eminent. In this letter, we present a method that allows for an enhancement in S/B(irreducible) of the order of 100% in $pp\to (h\to \gamma\gamma) jj$ for a center of mass energy of 8 and 14 TeV. This is achieved by applying the matrix element method. We discuss the implications of detector resolution effects and various approximations of the involved event simulation and reconstruction. The matrix element method provides a reliable, stable, and efficient handle to separate signal from background, and the gluon and weak boson fusion components involved in this process. Employing this method, a more precise Higgs boson coupling extraction can be obtained, and our results are of immediate relevance for current searches.
  11/2012;
• Source

  Available from: Jeppe Rosenkrantz Andersen

  Article: W Plus Multiple Jets at the LHC with High Energy Jets

  Jeppe R. Andersen, Tuomas Hapola, Jennifer M. Smillie
  [show abstract] [hide abstract]
  ABSTRACT: We study the production of a W boson in association with n hard QCD jets (for n>=2), with a particular emphasis on results relevant for the Large Hadron Collider (7 TeV and 8 TeV). We present predictions for this process from High Energy Jets, a framework for all-order resummation of the dominant contributions from wide-angle QCD emissions. We first compare predictions against recent ATLAS data and then shift focus to observables and regions of phase space where effects beyond NLO are expected to be large.
  06/2012;
• Source

  Available from: Jeppe Rosenkrantz Andersen

  Article: High Energy Description of Processes with Multiple Hard Jets

  Jeppe R. Andersen, Jennifer M. Smillie
  [show abstract] [hide abstract]
  ABSTRACT: High Energy Jets (HEJ) is a new framework for approximating the all-order perturbative corrections to multi-jet processes, with a focus on the hard, wide-angle QCD emissions, which underpins the perturbative description of hard jets. In this contribution we review the basic concepts of HEJ, and present some new predictions for observables in dijet-production, and for W-boson production in association with at least 3 jets.
  Nuclear Physics B - Proceedings Supplements. 07/2010;
• Article: The SM and NLO Multileg and SM MC Working Groups: Summary Report

  J. Alcaraz Maestre, S. Alioli, J. R. Andersen, R. D. Ball, A. Buckley, M. Cacciari, F. Campanario, N. Chanon, G. Chachamis, V. Ciulli, [......], P. Torrielli, F. Tramontano, M. Tripiana, Z. Trócsányi, M. Ubiali, V. Yundin, S. Weinzierl, J. Winter, J. Y. Yu, K. Zapp
  [show abstract] [hide abstract]
  ABSTRACT: The 2011 Les Houches workshop was the first to confront LHC data. In the two years since the previous workshop there have been significant advances in both soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the inclusion of those NLO calculations into parton shower Monte Carlos, and the tuning of the non-perturbative parameters of those Monte Carlos. These proceedings describe the theoretical advances that have taken place, the impact of the early LHC data, and the areas for future development.
  03/2012;
• Article: Factorization of the t-channel pole in quark-gluon scattering

  Jeppe R. Andersen, Jennifer M. Smillie
  [show abstract] [hide abstract]
  ABSTRACT: By exploring specific helicity states in quark-gluon scattering at tree level we show explicitly that the full t-channel pole can be described exactly as a contraction of two local currents. In the four cases of helicity assignment where a channel exists also for qQ-scattering, qg-scattering is described exactly by this t-channel pole. Only in two of the four remaining helicity assignments is there a contribution from u- and s-channel poles. We extract a gauge-invariant definition for the t-channel current generated by the scattering of a gluon and offer an interpretation of the form.
  Phys. Rev. D. 06/2010; 81(11).