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1.
Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower / Bewick, Gavin (Durham U., IPPP) ; Ferrario Ravasio, Silvia  (Durham U., IPPP ; Oxford U., Theor. Phys.) ; Richardson, Peter (Durham U., IPPP ; CERN) ; Seymour, Michael H. (Manchester U.)
We study the simulation of initial-state radiation in angular-ordered parton showers in order to investigate how different interpretations of the ordering variable affect the logarithmic accuracy of such showers. This also enables us to implement a recoil scheme which is consistent between final-state and initial-state radiation. [...]
arXiv:2107.04051; CERN-TH-2021-103; OUTP-21-18P; MCnet-21-13; IPPP/21/05.- 2022-01-07 - 27 p. - Published in : JHEP 01 (2022) 026 Fulltext: document - PDF; 2107.04051 - PDF;
2.
Logarithmic accuracy of angular-ordered parton showers / Bewick, Gavin (Durham U., IPPP) ; Ferrario Ravasio, Silvia (Durham U., IPPP) ; Richardson, Peter (Durham U., IPPP ; CERN) ; Seymour, Michael H. (Manchester U.)
We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. [...]
arXiv:1904.11866; MAN/HEP/2019/003; CERN-TH-2019-047; MCnet-19-08; IPPP/19/30.- 2020-04-03 - 28 p. - Published in : JHEP 2004 (2020) 019 Article from SCOAP3: PDF; Fulltext: PDF;
3.
Herwig 7.3 Release Note / Bewick, Gavin (Durham U., IPPP) ; Ferrario Ravasio, Silvia (CERN) ; Gieseke, Stefan (KIT, Karlsruhe, TP) ; Kiebacher, Stefan (KIT, Karlsruhe, TP) ; Masouminia, Mohammad R. (Durham U., IPPP) ; Papaefstathiou, Andreas (Kennesaw State U.) ; Plätzer, Simon (Graz U.) ; Richardson, Peter (Durham U., IPPP) ; Samitz, Daniel (Stefan Meyer Inst. Subatomare Phys.) ; Seymour, Michael H. (Manchester U.) et al.
A new release of the Monte Carlo event generator Herwig (version 7.3) has been launched. This iteration encompasses several enhancements over its predecessor, version 7.2. [...]
arXiv:2312.05175; CERN-TH-2023-223; HERWIG-2023-01; KA-TP-28-2023; MCnet-23-19; IPPP/23/66.- 2024-10-14 - 10 p. - Published in : Eur. Phys. J. C 84 (2024) 1053 Fulltext: 2312.05175 - PDF; document - PDF;
4.
High energy lepton colliders as the ultimate Higgs microscopes / Banerjee, Shankha (CERN) ; Gupta, Rick S. (Durham U., IPPP) ; Ochoa-Valeriano, Oscar (Durham U., IPPP) ; Spannowsky, Michael (Durham U., IPPP)
We study standard electroweak/Higgs processes at the high-energy lepton colliders ILC and CLIC. We identify a subset of three operators in the SMEFT that give leading contributions to these processes at high energies. [...]
arXiv:2109.14634; CERN-TH-2021-142; IPPP/21/35.- 2022-02-21 - 25 p. - Published in : JHEP 02 (2022) 176 Fulltext: document - PDF; 2109.14634 - PDF;
5.
Parton Shower Uncertainties with Herwig 7: Benchmarks at Leading Order / Bellm, Johannes (Durham U., IPPP ; Durham U.) ; Nail, Graeme (Manchester U. ; Karlsruhe U., ITP) ; Plätzer, Simon (Durham U. ; Durham U., IPPP ; Manchester U.) ; Schichtel, Peter (Durham U., IPPP ; Durham U.) ; Siódmok, Andrzej (CERN ; Cracow, INP)
We perform a detailed study of the sources of perturbative uncertainty in parton shower predictions within the Herwig 7 event generator. We benchmark two rather different parton shower algorithms, based on angular-ordered and dipole-type evolution, against each other. [...]
arXiv:1605.01338; MAN-HEP-2016-06; CERN-TH-2016-093; HERWIG-2016-03; IFJPAN-IV-2016-7; MCNET-16-12; IPPP-16-34; KA-TP-12-2016; MAN-HEP-2016-06; CERN-TH-2016-093; HERWIG-2016-03; IFJPAN-IV-2016-7; KA-TP-12-2016; MCNET-16-12; IPPP-16-34.- Geneva Geneva : CERN, CERN, 2016-12-02 - 18 p. - Published in : Eur. Phys. J. C 76 (2016) 665 Article from SCOAP3: PDF; Fulltext: PDF;
6.
Spin Correlations in Parton Shower Simulations / Richardson, Peter (CERN ; Durham U., IPPP) ; Webster, Stephen (Durham U., IPPP)
Spin correlations are an important, but often neglected, effect in modern Monte Carlo event generators. We show that they can be fully incorporated in Herwig 7 using the algorithm originally proposed by Collins and Knowles in all stages of the event generation process and between the different stages of the event generation. [...]
arXiv:1807.01955; IPPP/18/55; CERN-TH-2018-154; IPPP-18-55; MCNET-18-12.- 2020-02-01 - 13 p. - Published in : Eur. Phys. J. C 80 (2020) 83 Article from SCOAP3: PDF; Fulltext: PDF;
7.
Herwig 7.2 Release Note / Bellm, Johannes (Lund U.) ; Bewick, Gavin (Durham U., IPPP) ; Ferrario Ravasio, Silvia (Durham U., IPPP) ; Gieseke, Stefan (KIT, Karlsruhe, TP) ; Grellscheid, David (Bergen U.) ; Kirchgaeßer, Patrick (KIT, Karlsruhe, TP) ; Masouminia, Mohammad R. (Durham U., IPPP) ; Nail, Graeme (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Papaefstathiou, Andreas (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Platzer, Simon (Vienna U.) et al.
A new release of the Monte Carlo event generator Herwig (version 7.2) is now available. This version introduces a number of improvements, notably: improvements to the simulation of multiple-parton interactions, including diffractive processes; a new model for baryonic colour re-connection; spin correlations in both the dipole and angular-ordered parton showers; improvements to strangeness production; an improved choice of evolution variable in the angular-ordered parton shower; support for generic Lorentz structures in BSM models..
arXiv:1912.06509; MAN/HEP/2019/011; CERN-TH-2019-213; IFJPAN-IV-2019-18; HERWIG-2019-02; UWTHPH-19-36; KA-TP-24-2019; LU-TP 19-57; MCnet-19-28; IPPP/19/91.- 2020-05-20 - 7 p. - Published in : Eur. Phys. J. C 80 (2020) 452 Article from SCOAP3: PDF; Fulltext: PDF;
8.
A fully differential SMEFT analysis of the golden channel using the method of moments / Banerjee, Shankha (CERN) ; Gupta, Rick S. (Durham U., IPPP) ; Ochoa-Valeriano, Oscar (Durham U., IPPP) ; Spannowsky, Michael (Durham U., IPPP) ; Venturini, Elena (Munich, Tech. U.)
The Method of Moments is a powerful framework to disentangle the relative contributions of amplitudes of a specific process to its various phase space regions. We apply this method to carry out a fully differential analysis of the Higgs decay channel $h \to 4\ell$ and constrain gauge-Higgs coupling modifications parametrised by dimension-six effective operators. [...]
arXiv:2012.11631; CERN-TH-2020-220; TUM-HEP-1309/20; IPPP/20/68.- 2021-06-04 - 32 p. - Published in : JHEP 2106 (2021) 031 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
9.
Precision SMEFT bounds from the VBF Higgs at high transverse momentum / Araz, Jack Y. (Durham U., IPPP) ; Banerjee, Shankha (CERN) ; Gupta, Rick S. (Durham U., IPPP) ; Spannowsky, Michael (Durham U., IPPP)
We study the production of Higgs bosons at high transverse momenta via vector-boson fusion (VBF) in the Standard Model Effective Field Theory (SMEFT). We find that contributions from four independent operator combinations dominate in this limit. [...]
arXiv:2011.03555; IPPP/20/52; CERN-TH-2020-186.- 2021-04-14 - 27 p. - Published in : JHEP 2104 (2021) 125 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
10.
Scale and isolation sensitivity of diphoton distributions at the LHC / Gehrmann, Thomas (Zurich U.) ; Glover, Nigel (Durham U., IPPP) ; Huss, Alexander (Durham U., IPPP ; CERN) ; Whitehead, James (Durham U., IPPP)
Precision measurements of diphoton distributions at the LHC display some tension with theory predictions, obtained at next-to-next-to-leading order (NNLO) in QCD. We revisit the theoretical uncertainties arising from the approximation of the experimental photon isolation by smooth-cone isolation, and from the choice of functional form for the renormalisation and factorisation scales. [...]
arXiv:2009.11310; IPPP/20/42; ZU-TH 17/20; CERN-TH-2020-160; CERN-TH-2020-160.- 2021-01-19 - 35 p. - Published in : JHEP 2101 (2021) 108 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;

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