Effective LeftRight Symmetric Model at NLO in QCD
Contact Author
Richard Ruiz
 University of Durham (IPPP)
 richard.ruiz AT durham.ac.uk
In collaboration with Olivier Mattelaer and Manimala Mitra [ 1 ], and Manimala Mitra, Darren Scott, and Michael Spannowsky [ 2 ].
Model Description
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}. The Lagrangian is given by,
The W_{R}, Z_{R}, couplings to fermions are separated into three pieces:
The W_{R} chiral coupling to quarks are
V_{ij}^{CKM'} is the righthanded (RH) CabbiboKobayashiMasakawa (CKM) matrix and is related to the SM CKM matrix. g=\sqrt{4\pi\alpha_{\rm EM}(M_Z)}/\sin\theta_W is the SM Weak coupling constant and k_{R}^{q} is an overall normalization for the W_{R} interaction strength. For leptons, the W_{R} coupling and leptonic mixing is parametrized by [ 3, 4 ],
For chiral fermion f, the Z_{R} neutral currents are parameterized by
k_{R}^{f} are the same k_{R}^{q,l} as for W_{R}. The chiral couplings g_{L,R}^{ZR,f} are combinations of electric and isospin charges. For more details, see [ 1 ].
QCD Corrections
The SM Lagrangian with Goldstone boson couplings in the Feynman Gauge 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. In the UFO file, five massless quarks are assumed as are zero offdiagonal SM CKM and RH CKM' matrix entries. For additional details, see [ 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.
Model Files
 EffLRSM_NLO.tgz: Standalone NLO in QCDaccurate UFO folder.
 effLRSM.fr: Main model file. Relies on sm.fr (default FR model file) being declared elsewhere.
 effLRSMnlo.nb: Mathematica notebook file that generates UFO file from FeynRules model files. Allows user to also run quick sanity checks (optional) on model.
 EffLRSMnlo_Files.tgz: Standalone package containing effLRSM.fr, effLRSMnlo.nb, diagonalMixing.rst, massless.rst (default FR file), and sm.fr (default FR file).
 EffLRSMnlo_FilesWithUFO.tgz: Combination of EffLRSMnlo_Files.tgz and EffLRSM_NLO.tgz.
To open any of the packages and unpack via the terminal, use the commands:
~/Path $ tar zxvf EffLRSM_NLO.tgz
~/Path $ tar zxvf EffLRSMnlo_FilesWithUFO.tgz
Notes
 Aside from the SM inputs, this model contains 28 free parameters:
 Five masses: MWR, MZR, mN1, mN2, mN3. Defaults are 3 TeV, 5.07 TeV, 173.3 GeV, 10^{12} GeV, and 10^{14} GeV, respectively.
 Five widths: WWR, WZR, WN1, WN2, WN3. Defaults are 84.3 GeV, 114 GeV, 2.12^{8} GeV, 100 GeV, and 100 GeV, respectively.
 Nine real (no CP violation) mixing parameters for RH quark mixing: VCKMR[u,d] for u = up (1), charm (2), top (3) and d = down (1), strange (2), bottom (3). Default values are VCKMR = Identity(3x3), i.e., VCKMR[1,1] = VCKMR[2,2] = VCKMR[3,3] = 1 and all others zero.
 Nine real (no CP violation) mixing parameters for RH leptonic mixing: YlN[l,N] for l = e (1), mu (2), tau (3) and N = N1 (1), N2 (2), N3 (3). Default values are YlN = Identity(3x3), i.e., YlN[1,1] = YlN[2,2] YlN[3,3] and all others zero.
 Default model settings assumes five massless quarks, massless light neutrinos, and massless charged leptons. This is easily modifiable by regenerating UFO files.
Validation
 Partial and total widths for W_{R}, Z_{R}, and N_{1} are checked against exact analytic calculations. See [ 1 ] for more information.
 The model file was checked against exact NLO W_{R} predictions from [ 2 ] and references within [ 1 ].
List of studies that have used the model file
 Please email to update this space.
References
 Please cite [ 1 ] for the model file and [ 2 ] for neutrino jets.
[1] O. Mattelaer, M. Mitra, R. Ruiz, Automated Neutrino Jet and Top Jet Predictions at NLO+PS Matching in Effective LeftRight Symmetric Models, arXiv:1610.08985 [hepph]
[2] M. Mitra, D. Scott, and M. Spannowsky, Neutrino Jets from HighMass W_{R} Gauge Bosons in TeVScale LeftRight Symmetric Models, arXiv:1607.03504 [hepph]
[3] A. Atre, T. Han, S. Pascoli and B. Zhang, The Search for Heavy Majorana Neutrinos, JHEP 0905, 030 (2009), arXiv:0901.3589 [hepph]
[4] T. Han, I. Lewis, R. Ruiz, Z.G. Si, Lepton Number Violation and W' Chiral Couplings at the LHC, PRD87, 035011 (2013)
Attachments (5)

effLRSM.fr
(8.0 KB) 
added by richardphysics 20 months ago.
Main Effective LRSM model file. Relies on sm.fr (default FR model file) being declared elsewhere.

effLRSMnlo.nb
(27.3 KB) 
added by richardphysics 20 months ago.
Mathematica notebook file that generates UFO file from FeynRules model files. Allows user to also run quick sanity checks (optional) on model.

EffLRSM_NLO.tgz
(22.3 KB) 
added by richardphysics 20 months ago.
Standalone NLO in QCDaccurate UFO folder.

EffLRSMnlo_Files.tgz
(14.8 KB) 
added by richardphysics 20 months ago.
Standalone package containing effLRSM.fr, effLRSMnlo.nb, diagonalMixing.rst, massless.rst (default FR file), and sm.fr (default FR file).

EffLRSMnlo_FilesWithUFO.tgz
(36.8 KB) 
added by richardphysics 20 months ago.
Combination of EffLRSMnlo_Files.tgz and EffLRSM_NLO.tgz.
Download all attachments as: .zip