Changes between Version 1 and Version 2 of HECO

Timestamp:

Nov 22, 2023, 10:35:52 AM (8 months ago)

Author:

musumeci

Comment:

--

HECO

@@ -1 @@
-mplemented two new UFO models for High Electric Charge Objects (HECOs) pair production by including resummation effects as described in this paper:  https://arxiv.org/pdf/2310.17452.pdf.  
-These models include: 1) γ exchange; 2) γ/Z^0 exchange.
-You can find more detailed description on section IV of the paper.
 
-models available here:
-https://drive.google.com/drive/folders/1iHJWJKGd-nLOTpUqzbwlCULex2mQhNm1?usp=drive_link
+
+'''Description of the UFO models for HECO pair production'''[[BR]]
+
+
+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]]
+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. 
+More details on the resummation technique can be found in https://arxiv.org/pdf/2310.17452.pdf
+
+
+Two distinct models have been developed:[[BR]]
+
+1. γ exchange UFO model: It takes into account the sole contribution from γ exchange, which is suitable for simulating both DY and PF processes. [[BR]]
+
+2. γ/Z0 exchange UFO model: This model includes the additional exchange of the Z0 boson in DY production. [[BR]]
+
+
+The UFO models incorporate two new input parameters:[[BR]]
+
+• The multiplicity of the charge '''n''' which appears in the coupling definition g = ne, with e being the electron charge [[BR]]
+
+• The cutoff energy scale parameter '''lambda'''[[BR]]
+These parameters will define the value of the running HECO mass.
+
+
+
+'''Commands for MadGraph5_aMC@NLO
+'''
+
+1. γ-only exchange 
+
+• Drell-Yan
+
+{{{
+import model heco_spinhalf_photononly
+generate p p > heco heco~
+output DY_HECO
+}}}
+
+• Photon-Fusion
+
+{{{ 
+import model heco_spinhalf_photononly
+generate a a > heco heco~
+output PF_HECO
+}}}
+
+2.  γ/Z0 exchange
+
+• Drell-Yan
+
+{{{ 
+import model heco_spinhalf_withZ0
+generate p p > heco heco~
+output DY_HECO_Z0
+}}}
+
+
+Set run card and parameters
+
+
+{{{
+launch name_of_theoutput  ### replace name_of_theoutput accordingly, i.e. DY_HECO_Z0
+set ebeam1 6500 ### beam 1 energy in GeV
+set ebeam2 6500 ### beam 2 energy in GeV
+set lpp1 1   ###   beam 1 type (1=proton)
+set lpp2 1   ###   beam 2 type (1=proton)
+set pdlabel lhapdf ### set the pdlabel argument
+set lhaid 82000    ### set the pdf set 
+set nevents 10000   ### number of events
+
+set n 20 ### set the multiplicity of the charge 
+set lambda 1000  ### set the cutoff energy scale in GeV
+
+}}}
+
+
+
+