Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models

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.

Constraining the right-handed gauge boson mass from lepton number violating meson decays in a low scale left-right model

“…Assuming a 75% branching ratio of W R → jj, the 13 TeV ATLAS dijet search ruled out the W R mass upto 2.9 TeV [55]. For W R that couples to two light generation of quarks through CKM type mixing, the branching ratios to of W R → jj is 60% [11]. The limit will be comparable with the reported limit from ATLAS.…”

“…The light neutrino masses in this model are generated from dimension-five lepton number violating (LNV) operator [4] that violates lepton number by two units and hence their Majorana nature can be confirmed by observing the distinctive LNV signal at experiments, such as neutrinoless double beta decay (0νββ) [5][6][7][8]. Additionally, the LNV signature can also be tested at colliders from direct searches [9][10][11][12][13], as well as through indirect searches from meson and tau decays [14][15][16][17][18][19]. While the light neutrinos can give dominant contribution in 0νββ, the LNV searches at collider and meson decays are however not sensitive to such small eV mass scale.…”

Non-minimal flavored $${S}_{3}\otimes {Z}_{2}$$ S 3 ⊗ Z 2 left–right symmetric model

“…Additionally, the see-saw mechanism comes in rather naturally in the context of left-right symmetric scenarios; aside from other nice features, as for instance the recovery of parity symmetry, and the appearance of right-handed currents at high energy, which also makes such extensions very appealing. Recently, the left-right scenarios have been revised [15][16][17][18][19][20][21][22][23][24][25] in order to make contact with the latest experimental data of LHC. Moreover, the dark matter problem [26][27][28] and the diphoton excess anomaly [29][30][31][32][33] have been explored in this kind of scenarios.…”

Extra Higgs boson and Z′ as portals to signatures of heavy neutrinos at the LHC

“…In these conditions, the presence of the background becomes sizable. Furthermore, to stay with the aforementioned decay patterns, i.e., ν h → l ± W ∓ and ν h → ν l Z, where the weak gauge bosons can be on-shell, one also realises that a significant boost can be given to the W ± and Z decay products, so that they become more collimated in phase space as m ν h grows larger [35][36][37].…”