Outputs (2904)

Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter? (2018)
Journal Article
Brown, A. M., Lacroix, T., Lloyd, S., Bœhm, C., & Chadwick, P. (2018). Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter?. Physical Review D, 98(4), Article 041301(R). https://doi.org/10.1103/physrevd.98.041301

47 Tuc was the first globular cluster observed to be γ -ray bright, with the γ rays being attributed to a population of unresolved millisecond pulsars (MSPs). Recent kinematic data combined with detailed simulations appear to be consistent with the p... Read More about Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter?.

Holographic meson decays via worldsheet instantons (2018)
Journal Article
Peeters, K., Matuszewski, M., & Zamaklar, M. (2018). Holographic meson decays via worldsheet instantons. Journal of High Energy Physics, 2018(6), Article 83. https://doi.org/10.1007/jhep06%282018%29083

We study meson decays using instanton methods in two string models. The first model is the old string model in flat space which combines strings and massive particles and the second is the holographic, Sakai-Sugimoto model. Using the old string model... Read More about Holographic meson decays via worldsheet instantons.

Revisiting the non-resonant Higgs pair production at the HL-LHC (2018)
Journal Article
Adhikary, A., Banerjee, S., Barman, R. K., Bhattacherjee, B., & Niyogi, S. (2018). Revisiting the non-resonant Higgs pair production at the HL-LHC. Journal of High Energy Physics, 2018(7), Article 116. https://doi.org/10.1007/jhep07%282018%29116

We study the prospects of observing the non-resonant di-Higgs pair production in the Standard Model (SM) at the high luminosity run of the 14 TeV LHC (HL-LHC), upon combining multiple final states chosen on the basis of their yield and cleanliness. I... Read More about Revisiting the non-resonant Higgs pair production at the HL-LHC.

Boundaries, Mirror Symmetry, and Symplectic Duality in 3d N=4 Gauge Theory (2016)
Journal Article
Bullimore, M., Dimofte, T., Gaiotto, D., Hilburn, J., & Kim, H. (2016). Boundaries, Mirror Symmetry, and Symplectic Duality in 3d N=4 Gauge Theory. Journal of High Energy Physics, 2016(10), Article 108. https://doi.org/10.1007/jhep10%282016%29108

We introduce several families of N=(2, 2) UV boundary conditions in 3d N=4 gaugetheoriesandstudytheirIRimagesinsigma-modelstotheHiggsandCoulomb branches. In the presence of Omega deformations, a UV boundary condition defines a pair of modules for qua... Read More about Boundaries, Mirror Symmetry, and Symplectic Duality in 3d N=4 Gauge Theory.

The superconformal index and an elliptic algebra of surface defects (2014)
Journal Article
Bullimore, M., Fluder, M., Hollands, L., & Richmond, P. (2014). The superconformal index and an elliptic algebra of surface defects. Journal of High Energy Physics, 2014(10), Article 062. https://doi.org/10.1007/jhep10%282014%29062

In this paper we continue the study of the superconformal index of four-dimensional N =2 theories of class S in the presence of surface defects. Our main result is the construction of an algebra of difference operators, whose elements are labeled by... Read More about The superconformal index and an elliptic algebra of surface defects.

Scattering amplitudes and Wilson loops in twistor space (2011)
Journal Article
Adamo, T., Bullimore, M., Mason, L., & Skinner, D. (2011). Scattering amplitudes and Wilson loops in twistor space. Journal of Physics A: Mathematical and Theoretical, 44(45), Article 454008. https://doi.org/10.1088/1751-8113/44/45/454008

This paper reviews the recent progress in twistor approaches to Wilson loops, amplitudes and their duality for $\mathcal {N}=4$ super-Yang–Mills. Wilson loops and amplitudes are derived from first principles using the twistor action for maximally sup... Read More about Scattering amplitudes and Wilson loops in twistor space.

MHV diagrams in momentum twistor space (2010)
Journal Article
Bullimore, M., Mason, L., & Skinner, D. (2010). MHV diagrams in momentum twistor space. Journal of High Energy Physics, 2010(12), Article 032. https://doi.org/10.1007/jhep12%282010%29032

We show that there are remarkable simplifications when the MHV diagram formalism for N=4 super Yang-Mills is reformulated in momentum twistor space. The vertices are replaced by unity while each propagator becomes a dual superconformal ‘R-invariant’... Read More about MHV diagrams in momentum twistor space.

Asymptotically safe standard model extensions? (2018)
Journal Article
Pelaggi, G. M., Plascencia, A. D., Salvio, A., Sannino, F., Smirnov, J., & Strumia, A. (2018). Asymptotically safe standard model extensions?. Physical Review D, 97(9), Article 095013. https://doi.org/10.1103/physrevd.97.095013

We consider theories with a large number NF of charged fermions and compute the renormalization group equations for the gauge, Yukawa and quartic couplings resummed at leading order in 1=NF. We construct extensions of the standard model where SU(2) a... Read More about Asymptotically safe standard model extensions?.

Resummation for (boosted) top-quark pair production at NNLO+NNLL′ in QCD (2018)
Journal Article
Czakon, M., Ferroglia, A., Heymes, D., Mitov, A., Pecjak, B. D., Scott, D. J., …Yang, L. L. (2018). Resummation for (boosted) top-quark pair production at NNLO+NNLL′ in QCD. Journal of High Energy Physics, 2018(5), Article 149. https://doi.org/10.1007/jhep05%282018%29149

We construct predictions for top quark pair differential distributions at hadron colliders that combine state-of-the-art NNLO QCD calculations with double resummation at NNLL′ accuracy of threshold logarithms arising from soft gluon emissions and of... Read More about Resummation for (boosted) top-quark pair production at NNLO+NNLL′ in QCD.

Three-flavored nonresonant leptogenesis at intermediate scales (2018)
Journal Article
Moffat, K., Pascoli, S., Petcov, S., Schulz, H., & Turner, J. (2018). Three-flavored nonresonant leptogenesis at intermediate scales. Physical Review D, 98(1), Article 015036. https://doi.org/10.1103/physrevd.98.015036

Leptogenesis can successfully explain the matter-antimatter asymmetry via out-of-equilibrium decays of heavy Majorana neutrinos in the early Universe. In this article, we focus on nonresonant thermal leptogenesis and the possibility of lowering its s... Read More about Three-flavored nonresonant leptogenesis at intermediate scales.

Higgs bosons with large transverse momentum at the LHC (2018)
Journal Article
Kudashkin, K., Lindert, J. M., Melnikov, K., & Wever, C. (2018). Higgs bosons with large transverse momentum at the LHC. Physics Letters B, 782, 210-214. https://doi.org/10.1016/j.physletb.2018.05.009

We compute the next-to-leading order QCD corrections to the production of Higgs bosons with large transverse momentum at the LHC. To accomplish this, we combine the two-loop amplitudes for processes , and , recently computed in the approximation of n... Read More about Higgs bosons with large transverse momentum at the LHC.

Signals of the electroweak phase transition at colliders and gravitational wave observatories (2018)
Journal Article
Chala, M., Krause, C., & Nardini, G. (2018). Signals of the electroweak phase transition at colliders and gravitational wave observatories. Journal of High Energy Physics, 2018(07), Article 062. https://doi.org/10.1007/jhep07%282018%29062

If the electroweak phase transition (EWPT) is of strongly first order due to higher dimensional operators, the scale of new physics generating them is at the TeV scale or below. In this case the effective-field theory (EFT) neglecting operators of di... Read More about Signals of the electroweak phase transition at colliders and gravitational wave observatories.

Assessing the viability of A4, S4, and A5 flavor symmetries for description of neutrino mixing (2018)
Journal Article
Petcov, S., & Titov, A. (2018). Assessing the viability of A4, S4, and A5 flavor symmetries for description of neutrino mixing. Physical Review D, 97(11), Article 115045. https://doi.org/10.1103/physrevd.97.115045

We consider the A4, S4, and A5 discrete lepton flavor symmetries in the case of 3-neutrino mixing, broken down to nontrivial residual symmetries in the charged lepton and neutrino sectors in such a way that at least one of them is a Z2. Such symmetry... Read More about Assessing the viability of A4, S4, and A5 flavor symmetries for description of neutrino mixing.

Delta ACP within the Standard Model and beyond (2019)
Journal Article
Chala, M., Lenz, A., Rusov, A. V., & Scholtz, J. (2019). Delta ACP within the Standard Model and beyond. Journal of High Energy Physics, 2019(7), Article 161. https://doi.org/10.1007/jhep07%282019%29161

In light of the recent LHCb observation of CP violation in the charm sector, we review standard model (SM) predictions in the charm sector and in particular for ∆ACP. We get as an upper bound in the SM |∆ASM CP| ≤ 3.6 × 10−4 , which can be compared t... Read More about Delta ACP within the Standard Model and beyond.

Accelerating black hole chemistry (2019)
Journal Article
Gregory, R., & Scoins, A. (2019). Accelerating black hole chemistry. Physics Letters B, 796, 191-195. https://doi.org/10.1016/j.physletb.2019.06.071

We introduce a new set of chemical variables for the accelerating black hole. We show how these expressions suggest that conical defects emerging from a black hole can be considered as true hair – a new charge that the black hole can carry – and disc... Read More about Accelerating black hole chemistry.

Dijet production in diffractive deep-inelastic scattering in next-to-next-to-leading order QCD (2018)
Journal Article
Britzger, D., Currie, J., Gehrmann, T., Huss, A., Niehues, J., & Žlebčík, R. (2018). Dijet production in diffractive deep-inelastic scattering in next-to-next-to-leading order QCD. The European Physical Journal C, 78(7), Article 538. https://doi.org/10.1140/epjc/s10052-018-5981-z

Hard processes in diffractive deep-inelastic scattering can be described by a factorisation into parton-level subprocesses and diffractive parton distributions. In this framework, cross sections for inclusive dijet production in diffractive deep-inel... Read More about Dijet production in diffractive deep-inelastic scattering in next-to-next-to-leading order QCD.

Higgs constraints from vector boson fusion and scattering (2015)
Journal Article
Campbell, J. M., & Ellis, R. K. (2015). Higgs constraints from vector boson fusion and scattering. Journal of High Energy Physics, 2015(04), Article 030. https://doi.org/10.1007/jhep04%282015%29030

We present results on 4-lepton + 2-jet production, the partonic processes most commonly described as vector boson pair production in the Vector Boson Fusion (VBF) mode. This final state contains diagrams that are mediated by Higgs boson exchange. We... Read More about Higgs constraints from vector boson fusion and scattering.

Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+ (2014)
Journal Article
Campbell, J. M., Ellis, R. K., & Williams, C. (2014). Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+. Journal of High Energy Physics, 2014(04), Article 060. https://doi.org/10.1007/jhep04%282014%29060

We revisit the hadronic production of the four-lepton final state, e − e + μ − μ + , through the fusion of initial state gluons. This process is mediated by loops of quarks and we provide first full analytic results for helicity amplitudes that accou... Read More about Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+.

CNO neutrino Grand Prix: the race to solve the solar metallicity problem (2018)
Journal Article
Cerdeño, D. G., Davis, J. H., Fairbairn, M., & Vincent, A. C. (2018). CNO neutrino Grand Prix: the race to solve the solar metallicity problem. Journal of Cosmology and Astroparticle Physics, 2018(04), Article 037. https://doi.org/10.1088/1475-7516/2018/04/037

Several next-generation experiments aim to make the first measurement of the neutrino flux from the Carbon-Nitrogen-Oxygen (CNO) solar fusion cycle. We calculate how much time these experiments will need to run for in order to measure this flux with... Read More about CNO neutrino Grand Prix: the race to solve the solar metallicity problem.

Solving differential equations with neural networks: Applications to the calculation of cosmological phase transitions (2019)
Journal Article
Piscopo, M. L., Spannowsky, M., & Waite, P. (2019). Solving differential equations with neural networks: Applications to the calculation of cosmological phase transitions. Physical Review D, 100(1), Article 016002. https://doi.org/10.1103/physrevd.100.016002

Starting from the observation that artificial neural networks are uniquely suited to solving optimization problems, and most physics problems can be cast as an optimization task, we introduce a novel way of finding a numerical solution to wide classe... Read More about Solving differential equations with neural networks: Applications to the calculation of cosmological phase transitions.