This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
2017:groups:np:efttherror [2017/06/22 14:07] shankha.banerjee |
2017:groups:np:efttherror [2017/07/05 09:20] benjamin.fuks |
||
---|---|---|---|
Line 6: | Line 6: | ||
- | A question that often arises is wheter dimension-8 effects compromise present analysis testing dimension-6 ones. Normally this requires a discussion about the expected size of dimension-8 operators under given assumptions (see for instance "On the Validity of the Effective Field Theory Approach to SM Precision Tests" https://arxiv.org/pdf/1604.06444.pdf) | + | A question that often arises is whether dimension-8 effects compromise present analysis testing dimension-6 ones. Normally this requires a discussion about the expected size of dimension-8 operators under given assumptions (see for instance "On the Validity of the Effective Field Theory Approach to SM Precision Tests" https://arxiv.org/pdf/1604.06444.pdf) |
- | Here we want to compute a class of dimesnion-8 effects that arises after a change of basis, in such a way that their coefficient is uniquely related to the coefficients of dimension-6 operators. | + | Here we want to compute a class of dimension-8 effects that arises after a change of basis, in such a way that their coefficient is uniquely related to the coefficients of dimension-6 operators. |
The goal of this analysis will be to understand under what conditions we can trust the dimension-6 analysis in the rotated basis. | The goal of this analysis will be to understand under what conditions we can trust the dimension-6 analysis in the rotated basis. | ||
Line 37: | Line 37: | ||
2) comupte contribution to \psi\psi -> V_L V_L from O_1, O_2 and O_8 | 2) comupte contribution to \psi\psi -> V_L V_L from O_1, O_2 and O_8 | ||
Use Re-Weighting method to avoid statistical error in the various generation | Use Re-Weighting method to avoid statistical error in the various generation | ||
- | -> Model and param_card created by Ken + Ramona -> Run by **Olivier** | + | -> Model and param_card created by Ken + **Ramona** -> Run by **Olivier** |
3) Impose that the quadratic piece be bigger than the linear piece, and test in these conditions how big the dimension-8 contribution becomes | 3) Impose that the quadratic piece be bigger than the linear piece, and test in these conditions how big the dimension-8 contribution becomes | ||
Line 44: | Line 44: | ||
4) Understand wheter this behavior is the same in other processes | 4) Understand wheter this behavior is the same in other processes | ||
-> **Shankha**: O_W, O_B and O_WB and O_phi_1 (this one is strongly constrained by custodial symmetry, that's what I remember) (Eq. 2 in Ref. https://arxiv.org/pdf/1211.4580.pdf) which modify the ZWW/ gamma WW couplings as given in Eqs. 27 and 28. | -> **Shankha**: O_W, O_B and O_WB and O_phi_1 (this one is strongly constrained by custodial symmetry, that's what I remember) (Eq. 2 in Ref. https://arxiv.org/pdf/1211.4580.pdf) which modify the ZWW/ gamma WW couplings as given in Eqs. 27 and 28. | ||
- | -> **Ken** for generating the model, Shankha for the generation/comparaison | + | -> **Ken** and **Ramona** for generating the model, **Biplob** and **Shankha** for the generation/comparaison |
Line 53: | Line 53: | ||
1) generate the model with and without those contributions | 1) generate the model with and without those contributions | ||
-> **Benj** | -> **Benj** | ||
+ | |||
+ | * {{:2017:groups:np:hel.dim6.fullytruncated.tgz|Here}} is a model fully truncated at the dim 6 level. | ||
2) generate p p > W W (same process as above) and compare the various results. | 2) generate p p > W W (same process as above) and compare the various results. |