Joint resummation for slepton pair production at hadron colliders

Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier/CNRS-IN2P3, 53 Avenue des Martyrs, F-38026 Grenoble, France
Nuclear Physics B (Impact Factor: 3.93). 05/2008; 794(1):46-60. DOI: 10.1016/j.nuclphysb.2007.10.021


We present a precision calculation of the transverse-momentum and invariant-mass distributions for supersymmetric particle pair production at hadron colliders, focusing on Drell–Yan like slepton pair and slepton–sneutrino associated production at the CERN Large Hadron Collider. We implement the joint resummation formalism at the next-to-leading logarithmic accuracy with a process-independent Sudakov form factor, thus ensuring a universal description of soft-gluon emission, and consistently match the obtained result with the pure perturbative result at the first order in the strong coupling constant, i.e. at O(αs). We also implement three different recent parameterizations of non-perturbative effects. Numerically, we give predictions for production and compare the resummed cross section with the perturbative result. The dependence on unphysical scales is found to be reduced, and non-perturbative contributions remain small.

Download full-text


Available from: Giuseppe Bozzi
  • Source
    • "This computation combines soft gluon resummation at the next-to-leading logarithmic accuracy and a fixed order calculation at the next-to-leading order [33]. It should be noted that soft gluon resummation can also be performed when the transverse momentum of the produced slepton pair p T is small [32], as this gives also rise to possibly large logarithmic terms, or simultaneously in both regimes, i.e., when p T is small and M close to threshold [34]. – 7 – [ GeV ] "
    [Show abstract] [Hide abstract]
    ABSTRACT: Motivated by the shift in experimental attention towards electroweak supersymmetric particle production at the CERN LHC, we update in this paper our precision predictions at next-to-leading order of perturbative QCD matched to resummation at the next-to-leading logarithmic accuracy for direct slepton pair production in proton-proton collisions. Simplified models, now commonly adopted by the experimental collaborations for selectrons and smuons as well as mixing staus, are used as benchmarks for total cross sections at achieved and future center-of-mass energies. They are presented together with the corresponding scale and parton density uncertainties in graphical and tabular form for future reference. Using modern Monte Carlo techniques, we also reanalyze recent ATLAS and CMS slepton searches in light of our precision cross sections and for various assumptions on the decomposition of the sleptons and their neutralino decay products.
    Preview · Article · Oct 2013 · Journal of High Energy Physics
  • Source
    • ". The SUSY corrections arising at NLO the latter are given by a vertex diagram with a gluino-squarksquark loop plus external-leg corrections. They have been calculated in [14] [21] [29]. We have recomputed these contributions and find agreement with results in the literature. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We use a recent approach to soft-gluon resummation based on effective field theory to implement soft-gluon resummation at NNNLL order for slepton-pair production in SUSY extensions of the Standard Model. This approach resums large logarithmic corrections arising from the dynamical enhancement of the partonic threshold region caused by steeply falling parton luminosities. We evaluate the resummed invariant-mass distribution and total cross section for slepton-pair production at the Tevatron and LHC, matching our results onto NLO fixed-order calculations. As a byproduct, we also study virtual SUSY effects in the context of soft-gluon resummation for the Drell-Yan process.
    Preview · Article · Nov 2011 · Journal of High Energy Physics
  • Source
    • "For such scenarios, we address collider prospects for the SUSY parameter determination, the stopping of slow staus in the detectors, and viability tests of exceptionally small relic stau abundances. Theoretical predictions for slepton-pair production via the Drell–Yan channel are well known since many years and include next-to-leading order (NLO) corrections from QCD and SUSY-QCD [75] [76] [77] and resummation improved results at the next-to-leading logarithmic (NLL) level [78] [79] [80]. The NLO QCD and SUSY-QCD results are available via the software package Prospino 2 [81]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We calculate dominant cross section contributions for stau pair production at hadron colliders within the MSSM, taking into account left-right mixing of the stau eigenstates. We find that b-quark annihilation and gluon fusion can enhance the cross sections by more than one order of magnitude with respect to the Drell-Yan predictions. These additional production channels are not yet included in the common Monte Carlo analysis programs and have been neglected in experimental analyses so far. For long-lived staus, we investigate differential distributions and prospects for their stopping in the collider detectors. New possible strategies are outlined to determine the mass and width of the heavy CP-even Higgs boson H0. Scans of the relevant regions in the CMSSM are performed and predictions are given for the current experiments at the LHC and the Tevatron. The obtained insights allow us to propose collider tests of cosmologically motivated scenarios with long-lived staus that have an exceptionally small thermal relic abundance.
    Full-text · Article · Jun 2011 · Journal of High Energy Physics
Show more