Changes between Version 9 and Version 10 of B-L-SM


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Timestamp:
Nov 30, 2018, 5:53:14 PM (6 years ago)
Author:
WeiLiu
Comment:

Updates on the B-L wiki

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  • B-L-SM

    v9 v10  
    22 as a U(1) extension of the SM with 3 RH neutrinos and a singlet scalar.
    33
     4This is an update to the previous minimal Zprime model.
     5
    46** Implementation authors
    5 * Lorenzo Basso
    6  * Physikalisches Institut, Albert-Ludwigs-Universität Freiburg (Germany)
    7  * lorenzo.basso -at- physik.uni-freiburg.de
    8  * (formerly at University of Southampton, UK & RAL-PPD, Didcot, UK)
    97
    10 Based upon the minimal B-L model implementation, done in collaboration with Giovanni Marco Pruna (TU Dresden, Institut für Kern- und Teilchenphysik, Dresden, Germany, formerly at University of Southampton, UK & RAL-PPD, Didcot, UK).
     8* This version
     9 * Wei Liu
     10  * Department of Physics & Astronomy, University College London
     11  * wei.liu.16 -at- ucl.ac.uk
     12  * update based on Lorenzo Basso's model with availability to FeynRules 2.3.
     13
     14* Previous version
     15 * Lorenzo Basso
     16  * Physikalisches Institut, Albert-Ludwigs-Universität Freiburg (Germany)
     17  * lorenzo.basso -at- physik.uni-freiburg.de
     18  * (formerly at University of Southampton, UK & RAL-PPD, Didcot, UK)
     19  * Based upon the minimal B-L model implementation, done in collaboration with Giovanni Marco Pruna (TU Dresden, Institut für Kern- und Teilchenphysik, Dresden, Germany, formerly at University of Southampton, UK & RAL-PPD, Didcot, UK).
     20
     21
    1122
    1223-----------------------
    … …  
    1526The model describe a U(1) extension of the SM, related to the B-L (baryon minus lepton) charge. 3 RH neutrinos are required to cancel the anomalies, thus providing neutrino masses via the type-I see-saw. A Z' boson is also present, together with a further scalar for the spontaneous symmetry breaking of the further U(1) factor, at TeV scale.
    1627
     28
     29 - Minimal B-L model: gt = 0. This is the "Minimal" version of the model, where the mixing between Z and Z' is set to zero. This choice is set for the .fr and UFO file.
     30 {{{#!comment
     31
    1732This model describes a 1-dimensional class of Z' models, where a continuous parameter scans over the possible discrete models. The model is fully implemented in the Feynman gauge (also Goldstones and Ghosts).
    1833
    1934Popular benchmark models from the literature are recovered by setting appropriated relations among the new gauge parameters.
    20 
    21  - Pure B-L model: gt = 0. This is the "pure" version of the model, where the mixing between Z and Z' is set to zero. Separate model files for this benchmark model exists.
    22  - SO(10)-inspired U(1)_chi: gt = - 4/5 g1p.
     35Separate model files for this benchmark model exists.
     36- SO(10)-inspired U(1)_chi: gt = - 4/5 g1p.
    2337 - U(1)_R: gt = -2 g1p.
     38}}}
    2439
    2540-----------------------
    2641** References
    27 
    28 * http://arxiv.org/abs/arXiv:1106.4762 Theoretical constraints on the couplings of non-exotic minimal Z' bosons (full model description in Feynman gauge)
    29 
    30 * For the pure B-L benchmark see also http://arxiv.org/abs/arXiv:0812.4313 Phenomenology of the minimal B-L extension of the Standard model: Z' and neutrinos.
    31 
    32 Details about available parameter space and experimental/theoretical constraints can be found in:
    33 
    34 * http://arxiv.org/abs/arXiv:1002.1939 Tree Level Unitarity Bounds for the Minimal B-L Model
    35 * http://arxiv.org/abs/arXiv:1002.3586 Z' discovery potential at the LHC in the minimal B-L extension of the Standard Model
    36 * http://arxiv.org/abs/arXiv:1004.3039 A Renormalisation Group Equation Study of the Scalar Sector of the Minimal B-L Extension of the Standard Model
    37 * http://arxiv.org/abs/arXiv:1011.2612 Phenomenology of the minimal B−L extension of the Standard Model: the Higgs sector
    38 
    39 -----------------------
    40 ** Model files
    41 
    42 See attachments
    43 
    44 -----------------------
    45 ** Parameter description and user guide
    46 
    47 The choice of benchmark model within the class is done by selecting the appropriate relation between the new gauge couplings. "g1p" is the gauge coupling directly connected to the U(1)_{B-L} group (also present in the minimal B-L model files), "gt" is the mixing parameter. Because of the limited number of degrees of freedom, the Z' mass has been chosen as the last free parameter, adjustable by the user. Therefore, the mixing Z-Z' angle, the B-L-breaking vev and the Z-boson are INTERNAL parameters, evaluated as a function of the input parameters (g1p, gt, MZp). Henceforth, it's up to the user to choose values for the independent parameter complying to experimental constraints to ensure not to spoil in particular the Z mass. Per given benchmark model, it is sufficient to choose a Zp mass allowed by the LEP constraints to obtain a Z mass compatible with the LEP measurement, within errors.
    48 
     42* Please cite https://arxiv.org/abs/1811.11452 and http://arxiv.org/abs/arXiv:0812.4313 for the using this version of the model.
     43* This version
     44 * https://arxiv.org/abs/1811.11452 LHC Constraints on a