No abstract

Publisher's copyright statement:Reprinted with permission from the American Physical Society: Mitra, Manimala, Ruiz, Richard, Scott, Darren J. Spannowsky, Michael (2016). Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models. Physical review D 94(9): 095016 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We reexamine the discovery potential at hadron colliders of high-mass right-handed (RH) gauge bosons W R -an inherent ingredient of left-right symmetric models (LRSM). We focus on the regime where the W R is very heavy compared to the heavy Majorana neutrino N, and we investigate an alternative signature for W R → N decays. The produced neutrinos are highly boosted in this mass regime. Subsequently, their decays via off-shell W R bosons to jets, i.e., N → l AE jj, are highly collimated, forming a single neutrino jet ðj N Þ. The final-state collider signature is then l AE j N , instead of the widely studied l AE l AE jj. Present search strategies are not sensitive to this hierarchical mass regime due to the breakdown of the collider signature definition. We take into account QCD corrections beyond next-to-leading order (NLO) that are important for high-mass Drell-Yan processes at the 13 TeV Large Hadron Collider (LHC). For the first time, we evaluate W R production at NLO with threshold resummation at next-to-next-to-leading logarithm (NNLL) matched to the threshold-improved parton distributions. With these improvements, we find that a W R of mass M W R ¼ 3ð4Þ½5 TeV and mass ratio of ðm N =M W R Þ < 0.1 can be discovered with a 5-6σ statistical significance at 13 TeV after 10ð100Þ½2000 fb −1 of data. Extending the analysis to the hypothetical 100 TeV Very Large Hadron Collider (VLHC), 5σ can be obtained for W R masses up to M W R ¼ 15ð30Þ with approximately 100 fb −1 (10 ab −1 ). Conversely, with 0.9ð10Þ½150 fb −1 of 13 TeV data, M W R < 3ð4Þ½5 TeV and ðm N =M W R Þ < 0.1 can be excluded at 95% C.L.; with 100 fb −1 (2.5 ab −1 ) of 100 TeV data, M W R < 22ð33Þ TeV can be excluded.

Reprinted with permission from the American Physical Society: Physical Review Letters 116, 202001 c (2016) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

The non-Abelian exponentiation theorem has recently been generalised to correlators of multiple Wilson line operators. The perturbative expansions of these correlators exponentiate in terms of sets of diagrams called webs, which together give rise to colour factors corresponding to connected graphs. The colour and kinematic degrees of freedom of individual diagrams in a web are entangled by mixing matrices of purely combinatorial origin. In this paper we relate the combinatorial study of these matrices to properties of partially ordered sets (posets), and hence obtain explicit solutions for certain families of web-mixing matrix, at arbitrary order in perturbation theory. We also provide a general expression for the rank of a general class of mixing matrices, which governs the number of independent colour factors arising from such webs. Finally, we use the poset language to examine a previously conjectured sum rule for the columns of web-mixing matrices which governs the cancellation of the leading subdivergences between diagrams in the web. Our results, when combined with parallel developments in the evaluation of kinematic integrals, offer new insights into the all-order structure of infrared singularities in non-Abelian gauge theories.

Abstract:We calculate a set of one-loop corrections to h → bb and h → ττ decays in the dimension-6 Standard Model effective field theory (SMEFT). In particular, working in the limit of vanishing gauge couplings, we calculate directly in the broken phase of the theory all large logarithmic corrections and in addition the finite corrections in the largem t limit. Moreover, we give exact results for one-loop contributions from four-fermion operators. We obtain these corrections within an extension of the widely used on-shell renormalisation scheme appropriate for SMEFT calculations, and show explicitly how UV divergent bare amplitudes from a total of 21 different SMEFT operators are rendered finite within this scheme. As a by-product of the calculation, we also compute to one-loop order the logarithmically enhanced and finite large-m t corrections to muon decay in the limit of vanishing gauge couplings, which is necessary to implement the G F input parameter scheme within the SMEFT.