Wrong cross section when I specify the polarisation of final W boson
Hi,
I want to calculate the cross section for the longitudinal W cross section in the sm W+1jet process at the 14 TeV LHC, so I modify the matrix.f in the subprocess folder after I output the process. For the g u > w+ d process, the results seem reasonable, when I put pt larger than 500 GeV, the results for the longitudinal is 0.00085pb, which is as expected, because at high-pt, the W should be mainly transverse. But when I do the same thing for the process u g > w+ d, the cross section with pt > 500 GeV for the longitudinal W is 5.9pb, which is not possible, as the total rate for pt > 500 GeV in this process is 0.6085pb.
Below is the part I modify the polarisation of W boson.
INTEGER ISUM_HEL
LOGICAL MULTI_CHANNEL
COMMON/
INTEGER MAPCONFIG(
COMMON/
INTEGER SUBDIAG(
COMMON/
DATA XTRY, XREJ /0,0/
DATA NGOOD /0,0/
DATA ISHEL/0,0/
SAVE YFRAC, IGOOD, JHEL
DATA (NHEL(I, 1),I=1,4) / 1,-1, 0,-1/
DATA (NHEL(I, 2),I=1,4) / 1,-1, 0, 1/
DATA (NHEL(I, 3),I=1,4) / 1, 1, 0,-1/
DATA (NHEL(I, 4),I=1,4) / 1, 1, 0, 1/
DATA (NHEL(I, 5),I=1,4) /-1,-1, 0,-1/
DATA (NHEL(I, 6),I=1,4) /-1,-1, 0, 1/
DATA (NHEL(I, 7),I=1,4) /-1, 1, 0,-1/
DATA (NHEL(I, 8),I=1,4) /-1, 1, 0, 1/
DATA IDEN/96/
Could you please help me have a look at it? Thanks a lot.
Best wishes,
Da Liu
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