Changes between Version 3 and Version 4 of EffLRSM
 Timestamp:
 10/28/16 13:22:51 (4 years ago)
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EffLRSM
v3 v4 1 Hello World  In Dev 1 Hello World  In Development  To be published Oct 30 2 2 3 = SM + ... at NLO in QCD = 3 Need: 4 * Description 5 * Files 6 * Notes 7 8 = Effective LeftRight Symmetric Model at NLO in QCD = 4 9 5 10 === Contact Author === … … 9 14 10 15 In collaboration with 11 Daniel Alva and Tao Han [ [#Alva 1] ], and Celine Degrande, Olivier Mattelear, and Jessica Turner [ [#Degrande 2] ]. 16 Olivier Mattelaer and Manimala Mitra [ [#Mattelaer 1] ], and 17 Manimala Mitra, Darren Scott, and Michael Spannowsky [ [#Mitra 2] ]. 12 18 13 19 14 20 == Model Description == 15 This effective model extends the Standard Model (SM) field content by introducing three righthanded (RH) neutrinos, which are singlets under the SM gauge symmetry (no color, weak isospin, or weak hypercharge charges). Each RH neutrino possesses one RH Majorana mass. After electroweak symmetry breaking, the Lagrangian with three heavy Majorana neutrinos ''N''i (for i=1,2,3) is given by [ [#Atre 3] ] 21 This effective model extends the Standard Model (SM) field content by introducing heavy LeftRight symmetric gauge bosons W,,R,,^+^, Z,,R,, with masses M,,WR,, and M,,ZR,,, as well as three heavy Majorana neutrinos N,,i,, with mass m,,Ni,,. 22 16 23 {{{ 17 24 #!latex … … 43 50 \end{eqnarray} 44 51 }}} 45 Neutrino masses (mNk) and mixing parameters (Vlk) between heavy mass eigenstate and (active) flavor eigenstates are taken to be independent, phenomenological parameters. This allows for maximum flexibility and model independence when calculating rates. Therefore, some care is required by the user. 46 The lepton number and flavorviolating interactions of the Lagrangian allow for modeling of the Type I, Inverse, and Linear seesaw mechanisms at both lepton, hadron, and leptohadron colliders. 52 47 53 48 54 == QCD Corrections == 49 The above Lagrangian with Goldstone boson couplings and in the Feynman Gauge was implemented into FeynRules 2.3.10. QCD renormalization and R2 rational counter terms were determined using NLOCT 1.02 and FeynArts 3.8. Feynman rules were collected into a single UFO, available below. 50 In the UFO file, five massless quarks are assumed as are zero offdiagonal CKM matrix entries. 51 For additional details, see [ [#Degrande 2] ] and references therein. 52 These additions permit treelevel calculations at LO and NLO in QCD and loopinduced calculations at LO in QCD using MadGraph_aMC@NLO. 55 The SM Lagrangian with Goldstone boson couplings in the Feynman Gauge 56 and the above Lagrangian in the Unitary gauge was implemented into FeynRules 2.3.10. QCD renormalization and R2 rational counter terms were determined using NLOCT 1.02 and FeynArts 3.8. Feynman rules were collected into a single UFO, available below. 57 In the UFO file, five massless quarks are assumed as are zero offdiagonal SM CKM and RH CKM' matrix entries. For additional details, see [ [#Mattelaer 1] ]. These additions permit treelevel calculations at LO and NLO in QCD and loopinduced calculations at LO in QCD using MadGraph_aMC@NLO, HERWIG, and SHERPA. 53 58 54 59 … … 86 91 87 92 == Validation == 88 * The model file was validated at LO in [ [#Alva 1] ]; see Tables 2 and 5 for further validation checks. 89 * The model file was validated at NLO in [ [#Degrande 2] ]; see Table 1 for further validation checks. 90 * For very large masses, this model has been constructed to satisfy the Goldstone Equivalence Theorem: 91 {{{ 92 #!latex 93 \begin{eqnarray} 94 \text{BR}(N_i \rightarrow W^+ \ell^) &=& \text{BR}(N_i \rightarrow W^ \ell^+) = 95 \\ 96 \text{BR}(N_i \rightarrow Z \nu_\ell + Z \overline{\nu_\ell} ) &=& 97 \text{BR}(N_i \rightarrow h \nu_\ell + h \overline{\nu_\ell} ) = 25\%. 98 \end{eqnarray} 99 }}} 93 * The model file was checked against exact NLO W,,R,, predictions from [ [# 2] ]. 94 * Partial and total widths for W,,R,,, Z,,R,,, and N,,1,, are checked against exact analytic calculations. See [ [# 1] ] for more information. 100 95 101 96 102 === List of analyses that have used the model file === 97 98 === List of studies that have used the model file === 103 99 * Please email to update this space. 104 100 105 101 106 102 == References == 107 * Please cite [ 3 ] for the model and [ 12 ] for the FR/UFO files.103 * Please cite [ 1 ] for the model file and [ 2 ] for neutrino jets. 108 104 109 [=#Alva] [1] D. Alva, T. Han, R. Ruiz, ''Heavy Majorana neutrinos from {{{$W\gamma$}}} ''fusion at hadron colliders,'' JHEP '''1502''', 072 (2015), arXiv:1411.7305 [hepph] 105 [=#Mattelaer] [1] O. Mattelaer, M. Mitra, R. Ruiz, 106 ''Automated Neutrino Jet and Top Jet Predictions at NLO+PS Matching in Effective LeftRight Symmetric Models,'' arXiv:1610.XXXXX [hepph] 110 107 111 [=#Degrande] [2] C. Degrande, O. Mattelear, R. Ruiz, J. Turner, ''FullyAutomated Precision Predictions for Heavy Neutrino Production Mechanisms at Hadron Colliders,'' arXiv:1602.06957 [hepph] 112 113 [=#Atre] [3] A. Atre, T. Han, S. Pascoli and B. Zhang, ''The Search for Heavy Majorana Neutrinos,'' JHEP '''0905''', 030 (2009), arXiv:0901.3589 [hepph] 108 [=#Mitra] [2] M. Mitra, D. Scott, and M. Spannowsky, 109 ''Neutrino Jets from HighMass W,,R,, Gauge Bosons in TeVScale LeftRight Symmetric Models'', arXiv:1607.03504 [hepph]