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: http://theory.sinp.msu.ru/pipermail/comphep-common/2007/000122.html
Дата изменения: Thu Apr 18 22:50:41 2013 Дата индексирования: Fri Feb 28 06:32:34 2014 Кодировка: |
Dear Oleg! Unfortunately, the current version of CompHEP does not support such feature. However we are working on the corresponding extension. Best wishes, A.Kryukov On Mon, 2007-05-21 at 23:13 -0500, Oleg Antipin wrote: > Dear Comphep Collaboration, > > My name is Oleg Antipin and I am a HEP Ph.D. student at Iowa State University, USA. > > I have a question about comphep. > > I am using version COMPHEP-4.4.3. > Interaction vertices have the structure ~ [Factor*Lorentz part], where Factor is > polinomial of model identifiers and constants. > > I was wondering if it's possible to implement effective vertices into comphep? > Say if vertex is absent at tree-level, at one loop level form-factors for > effective vertices will be complicated functions of kinematical variables and > kinematical regimes. > Is there any way to define such at the Lagrangian level? > It seems that program doesn't allow for the "Factor" to be function of the > kinematical variables. > Maybe it's possible to put them after program constructs the amplitude for the > process? > To give a concrete example, I want to define 2 gluons coupling to Higgs at one > loop level (coupling occurs through the quark loop). Form-factor for this vertex > will be real or imaginary function of the kinematical variable s=( p_gluon1 + > p_gluon2 )^2 depending if Sqrt[s] is enough to produce quark pair. > > Is it possible to create such a structures? > > Sincerely, Oleg Antipin. > > -- Alexander Kryukov <kryukov at theory.sinp.msu.ru> SINP MSU