Changes between Version 2 and Version 3 of HECO
- Timestamp:
- Dec 30, 2024, 12:27:23 PM (3 weeks ago)
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HECO
v2 v3 1 2 3 1 '''Description of the UFO models for HECO pair production'''[[BR]] 4 2 5 3 6 4 High-Electric-Charge Objects (HECOs) can be pair-produced via Drell-Yan and photon-fusion processes. Due to the large coupling, the perturbation theory breaks down. Nevertheless, one can resum the QED corrections at a UV fixed point for high electric charge and mass values.[[BR]] 7 The UFO models provided here describe both Photon Fusion and Drell-Yan processes, by including such resummation effects for ''spin-1/2'' HECOs with electric charge ''q > 11e''. By incorporating the resummation effects into the UFO models, we are able to provide reliable predictions for the production mechanisms under study.8 More details on the resummation technique can be found in https://arxiv.org/pdf/2310.17452.pdf 5 The UFO models provided here describe both Photon Fusion and Drell-Yan processes, by including such resummation effects for ''spin-1/2'' and 'spin-0'' HECOs with electric charge ''q > 11e''. By incorporating the resummation effects into the UFO models, we are able to provide reliable predictions for the production mechanisms under study. 6 More details on the resummation technique can be found in https://arxiv.org/pdf/2310.17452.pdf (spin-1/2) and https://arxiv.org/abs/2412.19001 (spin-0). 9 7 8 **For spin-1/2 HECOs:** 10 9 11 10 Two distinct models have been developed:[[BR]] … … 15 14 2. γ/Z0 exchange UFO model: This model includes the additional exchange of the Z0 boson in DY production. [[BR]] 16 15 16 **For spin-0 HECOs:** 17 17 18 The UFO models incorporate two new input parameters:[[BR]] 18 A model has been developed: 19 [[BR]] 20 21 1. γ exchange UFO model: It takes into account the sole contribution from γ exchange. [[BR]] 22 23 \\ 24 \\ 25 26 27 These UFO models incorporate two new input parameters:[[BR]] 19 28 20 29 • The multiplicity of the charge '''n''' which appears in the coupling definition g = ne, with e being the electron charge [[BR]] … … 33 42 34 43 {{{ 35 import model heco_spinhalf_photononly 44 import model heco_spinhalf_photononly ### or heco_spinzero_resum 36 45 generate p p > heco heco~ 37 46 output DY_HECO … … 41 50 42 51 {{{ 43 import model heco_spinhalf_photononly 52 import model heco_spinhalf_photononly ### or heco_spinzero_resum 44 53 generate a a > heco heco~ 45 54 output PF_HECO 46 55 }}} 47 56 48 2. γ/Z0 exchange 57 58 2. γ/Z0 exchange (''Valid for spin-1/2 only'') 49 59 50 60 • Drell-Yan
