Mini workshop: Precision EW and QCD calculations for the FCC studies: methods and tools

Europe/Zurich
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

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Alain Blondel (Universite de Geneve (CH)), Janusz Gluza (U.Silesia (PL)), Patrick Janot (CERN)
Description
Motivation for the mini-workshop on multiloop/multiscale methods and tools in the context of precise Z-boson studies

 

The future 100-km circular collider (FCC, see the web page) will deliver the highest integrated luminosities to study all heavy Standard Model particles with unprecedented precision.

The first step of this collider (FCC-ee) will deliver e+e− collisions to study the Z, W, and Higgs bosons, and the top quark, but also the b and c quarks, and the tau lepton. The number of Z bosons produced by FCC-ee (up to 5×10^12), for example, is expected to be almost six orders of magnitude larger than the number of Z bosons collected at LEP (2×10^7), and orders of magnitude larger than that envisioned with a linear collider (a few 10^9). Furthermore, the exquisite determination of the centre-of-mass energy by resonant depolarization available in the storage rings will allow measurements of the W and Z masses and widths with a precision of a few hundred keV. The high-precision measurements and the observation of rare processes made possible by these large data samples will open opportunities for new physics discoveries, from very weakly-coupled light particles that could explain the yet unobserved dark matter to quantum effects of high-mass scale new physics typically up to 100 TeV. For these quantum effects to be measurable, however, the precision of the theoretical calculations that predict the various observables within the standard model and beyond will have to match that of the experimental measurements, i.e., to improve by one-to-two orders of magnitude with respect to current achievements. This tour-de-force will require complete two- and three-loop corrections to be calculated, and probably the developments of breakthrough computation techniques to keep the time needed for these numerical calculations within reasonable limits.

The purpose of the mini-workshop is to discuss:

(i) the precision of the theoretical calculations that predict the various observables within the standard model (and beyond) required to match that of the experimental measurements to be made by the FCC-ee,

(ii) the techniques to be applied and/or developed to reach this precision.

The programme will include detailed presentations on multiloop/multiscale techniques and other methods, identified bottle-necks problems of both present software and analytical/numerical methods, and discussions towards establishing a work plan for future studies.
 

For general physics studies connected with FCC-ee, you may consider to participate in the 2nd FCC Physcs weeks which will take place at CERN just a week after this event, 15-19 January 2018, see indico.

Follow-up workshop, January 2019: see indico

Participants
  • Alain Blondel
  • Andrés Ernesto Rentería Olivo
  • Bennie Ward
  • Daniel de Florian
  • David d'Enterria
  • diego liberati
  • German Rodrigo
  • Harald Ita
  • Ievgen Dubovyk
  • Janusz Gluza
  • Johann Usovitsch
  • Johannes Henn
  • Karolos Potamianos
  • Konstantinos Papadopoulos
  • Maciej Skrzypek
  • Mario Prausa
  • Niloufar Alipour Tehrani
  • Oleksandr Gituliar
  • Patrick Janot
  • Peter Marquard
  • Roberto Pittau
  • Roberto Tenchini
  • Rutger Boels
  • Shehu AbdusSalam
  • Sophia Borowka
  • Stanislaw Jadach
  • Stefan Weinzierl
  • Tord Riemann
  • Vitalii Okorokov
  • Vladimir Smirnov
  • Wojciech Flieger
  • Zbigniew Andrzej Was
  • Zoltan Trocsanyi
  • Friday, January 12
    • 9:25 AM
      Morning session: general introductions to precision issues in the context of FCC-ee 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Status on 28.11.2017, times given include discussion (~5 min).

    • 1
      Motivation: Experimental capabilities and requirements 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Alain Blondel (Universite de Geneve (CH))
    • 2
      Theory - status 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Janusz Gluza (University of Silesia (PL))
    • 3
      The Z boson line shape - from 1.5 loops at LEP to 2.5 loops in future 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Tord Riemann (University of Silesia)
    • 11:15 AM
      Tea & coffee break 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 4
      How to calculate QED higher orders in a form useful for MC event generators with soft photon and/or collinear resummation? 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Staszek Jadach (Polish Academy of Sciences (PL))
    • 5
      A mini review of methods of evaluating Feynman integrals. Solving differential equations for Feynman integrals by expansions near singular points 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Vladimir Smirnov (Inst. of Nuclear Physics of Moscow State Univ.)
    • 1:00 PM
      Discussions and lunch time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 2:55 PM
      Afternoon session: numerical methods in multiloop calculations 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 6
      MB-suite 1: AMBRE news: non-planar 3-loop vertices 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Evgen Dubovyk (U. Hamburg)
    • 7
      MB-suite 2: MBnumerics news 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Johann Usovitsch (Trinity College, Dublin)
    • 8
      pySecDec for phenomenological predictions 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Sophia Carola Borowka (CERN)
    • 9
      Direct calculation of multiloop integrals in d=4 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Roberto Pittau (Universidad de Granada (ES))
    • 5:00 PM
      Discussion 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 7:00 PM
      Dinner

      Restaurant La Meyrinoise, Chemin Antoine-Verchère, Meyrin

  • Saturday, January 13
    • 9:25 AM
      Morning session: multiloop methods 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 10
      Bootstrapping pentagon functions 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Johannes Henn (JGU Mainz)
    • 11
      Exploring the function space of Feynman integrals 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Stefan Weinzierl ( University of Mainz )
    • 12
      Expectations from Current Multi-loop Computations with the Unitarity Method 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Harald Ita (Universität Freiburg)
    • 11:20 AM
      Tea & coffee break 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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    • 13
      Mellin-Barnes meets Method of Brackets 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Mario Prausa (U. Freiburg)
    • 14
      Steepest descent, homology, Lefschetz thimbles and numerical multidimensional MB integrals 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Wojciech Flieger (University of Silesia )
    • 12:40 PM
      Discussions and lunch time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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    • 1:55 PM
      Afternoon session A: analytical tools 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 15
      About cuts and differential eqs approach 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

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      Speaker: Konstantinos Papadopoulos (Nat. Cent. for Sci. Res. Demokritos (GR))
    • 16
      Fuchsia and differential equations for multi-scale master integrals 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Oleksandr Gituliar (Universität Hamburg )
    • 3:00 PM
      Tea & coffee break 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 3:25 PM
      Afternoon session B: calculation of variety of higher orders form-factors and methods used 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 17
      Three-loop formfactors 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Peter Marquard (DESY)
    • 18
      Four loop form factor in N=4 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speaker: Rutger Boels (Universität Hamburg )
    • 4:30 PM
      Final Discussions, Summary and Outlook 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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    • 19
      discussion and action items 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

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      Speakers: Alain Blondel (Universite de Geneve (CH)), Janusz Gluza (University of Silesia (PL))