Loops and Legs in Quantum Field Theory
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Europe/Berlin
D-56329 St. Goar, Germany
D-56329 St. Goar, Germany
Romantik Hotel Schloss Rheinfels
Schloßberg 47
Description
14th Workshop organized by the Theory Group, DESY, Zeuthen
Photo: H. Klaes
Support
Participants
101
View full list
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16:00
Registration
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18:00
Dinner
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19:30
Reception
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16:00
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Plenary 1
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1
WelcomeSpeaker: Prof. Johannes Bluemlein (DESY)
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1
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10:30
Coffee break
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Plenary 1
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4
NNLO corrections to VBF Higgs productionHiggs production through Vector Boson Fusion (VBF) is the most important tree level production channel for Higgs production at the LHC. We present NNLO QCD corrections to differential distributions of H+2j in VBF using the antenna subtraction formalism.Speaker: Mr Juan Cruz-Martinez (IPPP Durham)
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13:00
Lunch
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Parallel 1
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Parallel 2
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16:00
Coffee break
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Parallel 1
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Anomalous triple-gauge-boson interaction in vector-boson pair production with Recola2Diboson production processes are of great importance in high-energy physics. On one hand, they are sensitive to the gauge-boson self interaction so that their measurement is a crucial test of the Standard Model (SM) description of the gauge-boson dynamics. On the other hand, diboson production at the LHC is a source of background for other SM processes as well as for direct New Physics (NP) searches. Therefore a precise theoretical knowledge of these processes is mandatory not only in view of precision tests of the SM but also in the one of the NP searches. We compute the NLO QCD and NLO electroweak corrections to diboson production processes at the LHC including the effect of the anomalous triple-gauge-boson interactions at NLO QCD accuracy. The anomalous triple-gauge-boson interactions are parametrized in terms of higher-dimension operators in the effective field theory (EFT) framework. Our calculation is the first application of Recola2 to EFT models.Speaker: Mauro Chiesa (University of Würzburg)
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Parallel 2
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18:30
Dinner
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Parallel 3
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22
Fully Differential Higgs Pair Production in Association With a Vector Boson at NNLO in QCDWe present a fully differential next-to-next-to-leading order calculation of the Higgs pair production in association with a Z boson, which is important for probing the trilinear Higgs self-coupling. The next-to-next-to-leading-order corrections enhance the next-to-leading order total cross sections by a factor of 1.2∼1.5, depending on the collider energy, and change the shape of next-to-leading order kinematic distributions. We discuss how to determine the trilinear Higgs self-coupling using our results.Speaker: Dr Jian Wang (Technical University of Munich)
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Parallel 4
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Precise determination of the strong coupling from energy-energy correlationIn this talk we present a determination of the strong coupling from a fit of QCD predictions for energy-energy correlation measured in electron-positron collisions at various center-of-mass energies. Experimental data are compared to precise theoretical calculations incorporating NNLO predictions combined with NNLL resummation in the back-to-back region. Hadronization corrections are assessed using modern shower Monte Carlo programs matched to NLO fixed-order computations.Speaker: Zoltán Tulipánt (University of Debrecen)
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10:30
Coffee break
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Parallel 3
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Parallel 4
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13:00
Lunch
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Parallel 5
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Parallel 6
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39
NNLO Corrections to W Boson ProductionThe inclusive production of leptonically decaying W bosons at the LHC is an important reference process for many analyses, and is relevant to our knowledge of the structure of the proton. We will present the results from a calculation of the W boson transverse momentum distribution at NNLO QCD using the method of antenna subtraction.Speaker: Mr Duncan Walker (IPPP, Durham University)
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Threshold resummation in rapidity for colorless particle production at the LHCWe present a formalism that resums threshold enhanced logarithms to all orders in perturbative Quantum Chromodynamics for the rapidity distribution of any colorless particle produced in hadron colliders. We achieve this by exploiting the factorization properties and K+G equations satisfied by the soft and virtual parts of the cross section. We compute for the first time, the resummed result in two dimensional Mellin space up to next-to-next-to-next-to-leading logarithmic (N3LL) accuracy. Using various state-of-the-art multi-loop and multi-leg results, we demonstrate the numerical impact of the resummed results up to next-to-next-to-leading order for the rapidity distribution of the Higgs boson and Drell-Yan production at the Large Hadron Collider. We find that these threshold logs in the resummed result stabilise the predictions against the renormalization and factorization scale choices as well as we achieve better perturbative convergence.Speaker: Dr Goutam Das (DESY, Hamburg)
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16:00
Coffee break
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Parallel 5
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Parallel 6
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18:00
Dinner
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20:00
Concert
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10:30
Coffee break
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Plenary 2
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13:00
Lunch
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15:00
Excursion
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18:30
Dinner
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Parallel 7
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Parallel 8
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Cuts and Feynman amplitudes beyond polylogarithmsIn this talk I will present some of the newest advancements in the calculation of multiloop Feynman amplitudes beyond multiple polylogarithms. In particular, I will show how to solve higher order irreducible differential equations for non-polylogarithmic Feynman integrals and how to write their solution in terms of a suitable basis of functions. I will also comment on the difficulties in embedding these integrals into physically relevant scattering amplitudes for the calculation of important observables for the LHC.Speaker: Lorenzo Tancredi (KIT Karlsruhe)
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10:30
Coffee break
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Parallel 7
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$\gamma_{5}$ in FDHIn this talk, we review recent developments of the four-dimensional helicity scheme (FDH) in higher-order calculations, mainly focusing on the consistent treatment of $\gamma_{5}$. We start with distinctive examples and demonstrate that at the one-loop level the recently proposed four-dimensional formulation (FDF) of FDH constitutes a viable and efficient alternative to more traditional approaches. Apart from this, we provide a comprehensive definition of an anticommuting $\gamma_{5}$ in FDH and discuss when it is convenient to use it in FDH multi-loop calculations.Speaker: Christoph Gnendiger (PSI)
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NLO mixed QCD-EW corrections to Higgs gluon fusionThe study of the Higgs boson properties is one of the main tasks of contemporary high-energy physics. Among Higgs properties, its interaction with gluons is interesting since it can be facilitated by yet unknown elementary particles. One of the major sources of uncertainty in the theoretical description of $ggH$ coupling originates from mixed QCD-electroweak contributions. The NLO QCD corrections to these contributions were evaluated few years ago in the approximation where electroweak boson masses were considered to be significantly larger than the mass of the Higgs boson and it is desirable to compute those corrections for physical masses of gauge bosons and Higgs boson. In this talk, I will present a major step towards this goal and describe the analytic evaluation of NLO mixed QCD-EW three-loop virtual corrections to $gg \to H$.Speaker: Mr Marco Bonetti (TTP KIT)
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Parallel 8
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Automated extraction of UV counterterms for arbitrary local operatorsComputing the anomalous dimensions of local composite operators present in both renormalisable and non-renormalisable QFTs is generally challenging due to the presence of many scales and loops. In this talk we present an extension of the local R* method which fully automates this task. By extending the local R* operation to arbitrary QFTs we, transform this problem to one of computing massless propagator integrals, suitable for efficient evaluation with the Forcer program.Speaker: Dr Ben Ruijl (ETH Zurich)
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13:00
Lunch
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Parallel 10
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CoLoRFulNNLO for LHC processesCoLoRFulNNLO is a completely local subtraction scheme for computing fully differential predictions in NNLO QCD. The method has been fully worked out for processes without colored particles in the initial state and has shown its many strengths when it was applied to three-jet production in electron-positron annihilation. In my talk, I will present the extension of the scheme to hadron initiated processes and show the first application of our method to key LHC processes.Speaker: Dr Adam Kardos (University of Debrecen)
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Parallel 9
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16:00
Coffee Break
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Parallel 10
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Parallel 9
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19:30
Conference dinner
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Plenary 3
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10:30
Coffee break
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Plenary 3
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Two-loop unitarity and dual conformal symmetryWe show that the power of generalized unitarity cuts extends beyond the construction of integrands. Both integration-by-parts identities and differential equations can be derived on unitarity cuts, using tangent vectors of unitarity cut surfaces. We present applications, from the extraction of symbol alphabets for nonplanar two-loop five-point integrals to the evaluation of UV divergences in 5-loop supergravity. A surprising connection with dual conformal symmetry is presented, which offers an analytic alternative to computational algebraic geometry, and also shines light on the generalization of dual conformal symmetry to nonplanar integrals.Speaker: Mao Zeng (UC Los Angeles)
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13:00
Lunch
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