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9 results on '"J. Klappert"'

1. Higgs-mass predictions in the MSSM and beyond

Author

P. Slavich, S. Heinemeyer, E. Bagnaschi, H. Bahl, M. Goodsell, H. E. Haber, T. Hahn, R. Harlander, W. Hollik, G. Lee, M. Mühlleitner, S. Paßehr, H. Rzehak, D. Stöckinger, A. Voigt, C. E. M. Wagner, G. Weiglein, B. C. Allanach, T. Biekötter, S. Borowka, J. Braathen, M. Carena, T. N. Dao, G. Degrassi, F. Domingo, P. Drechsel, U. Ellwanger, M. Gabelmann, R. Gröber, J. Klappert, T. Kwasnitza, D. Meuser, L. Mihaila, N. Murphy, K. Nickel, W. Porod, E. A. Reyes Rojas, I. Sobolev, and F. Staub

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Predictions for the Higgs masses are a distinctive feature of supersymmetric extensions of the Standard Model, where they play a crucial role in constraining the parameter space. The discovery of a Higgs boson and the remarkably precise measurement of its mass at the LHC have spurred new efforts aimed at improving the accuracy of the theoretical predictions for the Higgs masses in supersymmetric models. The “Precision SUSY Higgs Mass Calculation Initiative” (KUTS) was launched in 2014 to provide a forum for discussions between the different groups involved in these efforts. This report aims to present a comprehensive overview of the current status of Higgs-mass calculations in supersymmetric models, to document the many advances that were achieved in recent years and were discussed during the KUTS meetings, and to outline the prospects for future improvements in these calculations.

Published
2021
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2. The light CP-even MSSM Higgs mass including N$$^\mathbf {3}$$ 3 LO+N$$^\mathbf {3}$$ 3 LL QCD corrections

Author

R. V. Harlander, J. Klappert, and A. Voigt

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present a calculation of the light neutral CP-even Higgs boson pole mass in the real $$\text {MSSM}$$ MSSM which combines state-of-the-art EFT and fixed-order results, including the three-loop fixed-order QCD corrections as well as the resummation of logarithmic terms in the ratio of the weak to the SUSY scale up to fourth logarithmic order. This hybrid calculation should be valid for arbitrary SUSY scales above the weak scale. Comparison to the pure fixed-order and EFT results provides an estimate of their individual validity range.

Published
2020
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3. The light CP-even MSSM Higgs mass resummed to fourth logarithmic order

Author

R. V. Harlander, J. Klappert, A. D. Ochoa Franco, and A. Voigt

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present the calculation of the light neutral CP-even Higgs mass in the MSSM for a heavy SUSY spectrum by resumming enhanced terms through fourth logarithmic order (N$$^{3}$$ 3 LL), keeping terms of leading order in the top Yukawa coupling $$\alpha _t$$ αt , and NNLO in the strong coupling $$\alpha _s$$ αs . To this goal, the three-loop matching coefficient for the quartic Higgs coupling of the SM to the MSSM is derived to order $$\alpha _t^2\alpha _s^2$$ αt2αs2 by comparing the perturbative EFT to the fixed-order expression for the Higgs mass. The new matching coefficient is made available through an updated version of the program Himalaya. Numerical effects of the higher-order resummation are studied using specific examples, and sources of theoretical uncertainty on this result are discussed.

Published
2018
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4. Exploiting the WH/ZH symmetry in the search for new physics

Author

R. V. Harlander, J. Klappert, C. Pandini, and A. Papaefstathiou

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We suggest to isolate the loop-induced gluon-initiated component ($$gg\rightarrow ZH$$ gg→ZH ) for associated $$ZH$$ ZH production by using the similarity of the Drell–Yan-like component for $$ZH$$ ZH production to the $$WH$$ WH process. We argue that the cross-section ratio of the latter two processes can be predicted with high theoretical accuracy. Comparing it to the experimental $$ZH/WH$$ ZH/WH cross-section ratio should allow to probe for new physics in the $$gg\rightarrow ZH$$ gg→ZH component at the HL-LHC. We consider typical BSM scenarios in order to exemplify the effect they would have on the proposed observable.

Published
2018
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5. Exact top-quark mass dependence in hadronic Higgs production

Author

M. Niggetiedt, Robert V. Harlander, Michal Czakon, and J. Klappert

Subjects
Physics, Quantum chromodynamics, Top quark, Particle physics, Large Hadron Collider, High Energy Physics::Lattice, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Order (ring theory), law.invention, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), law, Effective field theory, Higgs boson, ddc:530, High Energy Physics::Experiment, Collider
Abstract

The impact of the finite top-quark mass on the inclusive Higgs production cross section at higher perturbative orders has been an open question for almost three decades. In this paper, we report on the computation of this effect at NNLO QCD. For the purely gluonic channel, it amounts to $+0.62\%$ relative to the result obtained in the HEFT approximation. The formally sub-leading partonic channels over-compensate this shift, leading to an overall effect of $-0.26\%$ at a $pp$ collider energy of $13\,\mathrm{TeV}$, and $-0.1\%$ at $8\,\mathrm{TeV}$. This result eliminates one of the main theoretical uncertainties to inclusive Higgs production cross section at the LHC., 5 pages, 1 figure

Published
2021
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6. Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report

Author

Bendavid, J, Caola, F, Ciulli, V, Harlander, R, Heinrich, G, Huston, J, Kallweit, S, Prestel, S, Re, E, Tackmann, K, Thaler, J, Theofilatos, K, Andersen, J, Bellm, J, Berger, N, Bhatia, D, Biedermann, B, Bräuer, S, Britzger, D, Buckley, A, Camacho, R, Chachamis, G, Chatterjee, S, Chen, X, Chiesa, M, Currie, J, Denner, A, Dreyer, F, Driencourt-Mangin, F, Forte, S, Garzelli, M, Gehrmann, T, Gieseke, S, Glover, E, Gras, P, Greiner, N, Gütschow, C, Gwenlan, C, Heil, M, Herndon, M, Hirschi, V, Hoang, A, Höche, S, Huss, A, Jones, S, Kar, D, Karlberg, A, Kassabov, Z, Kerner, M, Klappert, J, Kuttimalai, S, Lang, J, Larkoski, A, Lindert, J, Loch, P, Long, K, Lönnblad, L, Luisoni, G, Maier, A, Maierhöfer, P, Maître, D, Marzani, S, Mcfayden, J, Moult, I, Mozer, M, Mrenna, S, Nachman, B, Napoletano, D, Pandini, C, Papaefstathiou, A, Pellen, M, Perrozzi, L, Pires, J, Plätzer, S, Pozzorini, S, Quackenbush, S, Rabbertz, K, Rauch, M, Reuschle, C, Richardson, P, Gehrmann-De Ridder, A, Rodrigo, G, Rojo, J, Röntsch, R, Rottoli, L, Samitz, D, Samui, T, Sborlini, G, Schönherr, M, Schumann, S, Scyboz, L, Seth, S, Shao, H, Siódmok, A, Skands, P, Smillie, J, Soyez, G, Sun, P, Sutton, M, Tackmann, F, Uccirati, S, Weinzierl, S, Yazgan, E, Yuan, C, Yuan, F, J. Bendavid, F. Caola, V. Ciulli, R. Harlander, G. Heinrich, J. Huston, S. Kallweit, S. Prestel, E. Re, K. Tackmann, J. Thaler, K. Theofilatos, J. R. Andersen, J. Bellm, N. Berger, D. Bhatia, B. Biedermann, S. Bräuer, D. Britzger, A. G. Buckley, R. Camacho, G. Chachamis, S. Chatterjee, X. Chen, M. Chiesa, J. R. Currie, A. Denner, F. Dreyer, F. Driencourt-Mangin, S. Forte, M. V. Garzelli, T. Gehrmann, S. Gieseke, E. W. N. Glover, P. Gras, N. Greiner, C. Gütschow, C. Gwenlan, M. Heil, M. Herndon, V. Hirschi, A. H. Hoang, S. Höche, A. Huss, S. P. Jones, D. Kar, A. Karlberg, Z. Kassabov, M. Kerner, J. Klappert, S. Kuttimalai, J. -N. Lang, A. Larkoski, J. M. Lindert, P. Loch, K. Long, L. Lönnblad, G. Luisoni, A. Maier, P. Maierhöfer, D. Maître, S. Marzani, J. A. McFayden, I. Moult, M. Mozer, S. Mrenna, B. Nachman, D. Napoletano, C. Pandini, A. Papaefstathiou, M. Pellen, L. Perrozzi, J. Pires, S. Plätzer, S. Pozzorini, S. Quackenbush, K. Rabbertz, M. Rauch, C. Reuschle, P. Richardson, A. Gehrmann-De Ridder, G. Rodrigo, J. Rojo, R. Röntsch, L. Rottoli, D. Samitz, T. Samui, G. Sborlini, M. Schönherr, S. Schumann, L. Scyboz, S. Seth, H. -S. Shao, A. Siódmok, P. Z. Skands, J. M. Smillie, G. Soyez, P. Sun, M. R. Sutton, F. J. Tackmann, S. Uccirati, S. Weinzierl, E. Yazgan, C. -P. Yuan, F. Yuan, Bendavid, J, Caola, F, Ciulli, V, Harlander, R, Heinrich, G, Huston, J, Kallweit, S, Prestel, S, Re, E, Tackmann, K, Thaler, J, Theofilatos, K, Andersen, J, Bellm, J, Berger, N, Bhatia, D, Biedermann, B, Bräuer, S, Britzger, D, Buckley, A, Camacho, R, Chachamis, G, Chatterjee, S, Chen, X, Chiesa, M, Currie, J, Denner, A, Dreyer, F, Driencourt-Mangin, F, Forte, S, Garzelli, M, Gehrmann, T, Gieseke, S, Glover, E, Gras, P, Greiner, N, Gütschow, C, Gwenlan, C, Heil, M, Herndon, M, Hirschi, V, Hoang, A, Höche, S, Huss, A, Jones, S, Kar, D, Karlberg, A, Kassabov, Z, Kerner, M, Klappert, J, Kuttimalai, S, Lang, J, Larkoski, A, Lindert, J, Loch, P, Long, K, Lönnblad, L, Luisoni, G, Maier, A, Maierhöfer, P, Maître, D, Marzani, S, Mcfayden, J, Moult, I, Mozer, M, Mrenna, S, Nachman, B, Napoletano, D, Pandini, C, Papaefstathiou, A, Pellen, M, Perrozzi, L, Pires, J, Plätzer, S, Pozzorini, S, Quackenbush, S, Rabbertz, K, Rauch, M, Reuschle, C, Richardson, P, Gehrmann-De Ridder, A, Rodrigo, G, Rojo, J, Röntsch, R, Rottoli, L, Samitz, D, Samui, T, Sborlini, G, Schönherr, M, Schumann, S, Scyboz, L, Seth, S, Shao, H, Siódmok, A, Skands, P, Smillie, J, Soyez, G, Sun, P, Sutton, M, Tackmann, F, Uccirati, S, Weinzierl, S, Yazgan, E, Yuan, C, Yuan, F, J. Bendavid, F. Caola, V. Ciulli, R. Harlander, G. Heinrich, J. Huston, S. Kallweit, S. Prestel, E. Re, K. Tackmann, J. Thaler, K. Theofilatos, J. R. Andersen, J. Bellm, N. Berger, D. Bhatia, B. Biedermann, S. Bräuer, D. Britzger, A. G. Buckley, R. Camacho, G. Chachamis, S. Chatterjee, X. Chen, M. Chiesa, J. R. Currie, A. Denner, F. Dreyer, F. Driencourt-Mangin, S. Forte, M. V. Garzelli, T. Gehrmann, S. Gieseke, E. W. N. Glover, P. Gras, N. Greiner, C. Gütschow, C. Gwenlan, M. Heil, M. Herndon, V. Hirschi, A. H. Hoang, S. Höche, A. Huss, S. P. Jones, D. Kar, A. Karlberg, Z. Kassabov, M. Kerner, J. Klappert, S. Kuttimalai, J. -N. Lang, A. Larkoski, J. M. Lindert, P. Loch, K. Long, L. Lönnblad, G. Luisoni, A. Maier, P. Maierhöfer, D. Maître, S. Marzani, J. A. McFayden, I. Moult, M. Mozer, S. Mrenna, B. Nachman, D. Napoletano, C. Pandini, A. Papaefstathiou, M. Pellen, L. Perrozzi, J. Pires, S. Plätzer, S. Pozzorini, S. Quackenbush, K. Rabbertz, M. Rauch, C. Reuschle, P. Richardson, A. Gehrmann-De Ridder, G. Rodrigo, J. Rojo, R. Röntsch, L. Rottoli, D. Samitz, T. Samui, G. Sborlini, M. Schönherr, S. Schumann, L. Scyboz, S. Seth, H. -S. Shao, A. Siódmok, P. Z. Skands, J. M. Smillie, G. Soyez, P. Sun, M. R. Sutton, F. J. Tackmann, S. Uccirati, S. Weinzierl, E. Yazgan, C. -P. Yuan, and F. Yuan

Published
2018

8. Exact Top-Quark Mass Dependence in Hadronic Higgs Production.

Author

Czakon M, Harlander RV, Klappert J, and Niggetiedt M

Abstract

The impact of the finite top-quark mass on the inclusive Higgs production cross section at higher perturbative orders has been an open question for almost three decades. In this Letter, we report on the computation of this effect at next-to-next-to-leading order QCD. For the purely gluonic channel, it amounts to +0.62% relative to the result obtained in the Higgs effective field theory approximation. The formally subleading partonic channels overcompensate this shift, leading to an overall effect of -0.26% at a pp collider energy of 13 TeV, and -0.1% at 8 TeV. This result eliminates one of the main theoretical uncertainties to inclusive Higgs production cross section at the LHC.

Published
2021
Full Text
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9. Exploiting the WH/ZH symmetry in the search for new physics.

Author

Harlander RV, Klappert J, Pandini C, and Papaefstathiou A

Abstract

We suggest to isolate the loop-induced gluon-initiated component ( g g → Z H ) for associated ZH production by using the similarity of the Drell-Yan-like component for ZH production to the WH process. We argue that the cross-section ratio of the latter two processes can be predicted with high theoretical accuracy. Comparing it to the experimental Z H / W H cross-section ratio should allow to probe for new physics in the g g → Z H component at the HL-LHC. We consider typical BSM scenarios in order to exemplify the effect they would have on the proposed observable.

Published
2018
Full Text
View/download PDF

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