Piano for Sale

Participants:

Carlos Andres Florez Bustos, Mykhailo Dalchenko, Nitish Dhingra, Bhaskar Dutta, Yu Gao, Teruki Kamon, Nikolay Kolev, Ryan Mueller, Yongdo Oh, Manuel Alejandto Segura, Sean Wu, Zhenbin Wu.

References:

The theoretical paper is here: Distinguishing Standard Model Extensions using Monotop Chirality at the LHC

Yu Gao's talk (CETUP 2015 Dark Matter Session, Deadwood, South Dakota, June 14-26,2015): Nonthermal Dark Matter & Top Polarization at Collider

Mykhailo Dalchenko's talk (27th Rencontres de Blois - Particle Physics and Cosmology, Chateau de Blois, 41000 Blois, France, May 31 - June 5, 2015): Probing the Nonthermal Dark Matter at Hadron Colliders with the Wvents Containing a Single Top Quark in the Final State

Yu Gao's slides on monojet: Probing Light Nonthermal Dark Matter & LHC

Minsuk's monotop review: Monotops at the LHC

MG twiki on MLM matching (requires CERN authentication): https://twiki.cern.ch/twiki/bin/viewauth/CMS/MadGraphFall13Production

Code for determining xqcut / QCUT values (requires CERN authentication): https://twiki.cern.ch/twiki/bin/view/CMS/MadGraphFall13Production#Determination_of_the_QCUT

Colour Tracing Problem

Use the model baryogenX2N1MajWithLeftHand_UFO.tar.

Generaate madgraph stuff madgraph_generation.txt.

Use the lhe file (with an slha copy by removing everything outside the slha tag) with pythia 8.

Run pythia 8 with the main program monotop_test.cc

Pythia 8 fails with output monotop.out

Torborn Sjostrand's comments: SjostrandEmails.txt

So it turned out to be a pythia 8 problem; here are Peter Skand's comments.

We have a temporary fix for 1 extra jets, which is based on changing the (anti)color of the problematic gluon to a matching pair (e.g. 502 502). The code is here. The code uses C++ STL, so there may be compiler specific issues.

Reports