2015:groups:sm:nloew
Differences
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 | ||
|
2015:groups:sm:nloew [2015/06/09 19:26] vitaliano.ciulli |
2015:groups:sm:nloew [2016/02/17 22:30] vitaliano.ciulli |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | Working plan: | + | ====== NLO EW technical comparisons ====== |
| + | |||
| + | //If you are interested in contributing please subscribe to the [[https://e-groups.cern.ch/e-groups/EgroupsSearch.do?searchValue=houches-2015-topics-xwg-ewk-corrections|mailing list]]. You will be asked to log in with your CERN account. If you don't have a CERN account, please fill [[https://account.cern.ch/account/Externals/RegisterAccount.aspx|this form]] to create a lightweight account.// | ||
| + | |||
| + | ===== Working plan: ===== | ||
| + | |||
| + | ==== 1) Summary of codes for EW automation ==== | ||
| - | 1) Summary of codes for EW automation | ||
| Contributions from GOSAM, MadGraph5_aMC@NLO, OPENLOOPS, Recola, ... | Contributions from GOSAM, MadGraph5_aMC@NLO, OPENLOOPS, Recola, ... | ||
| - | 2) Technical comparison of EW NLO cross sections | + | ==== 2) Technical comparison of EW NLO cross sections ==== |
| Processes: pp -> lljj arXiv:1411.0916, table 3 (and optionally table 4) | Processes: pp -> lljj arXiv:1411.0916, table 3 (and optionally table 4) | ||
| Line 27: | Line 33: | ||
| ... | ... | ||
| - | 3) Comparison of Sudakov approximation with EW NLO corrections for distributions | + | ==== 3) Comparison of Sudakov approximation with EW NLO corrections for distributions ==== |
| Processes: pp -> lljj arXiv:1411.0916, table 3 and/or 4 | Processes: pp -> lljj arXiv:1411.0916, table 3 and/or 4 | ||
| Line 43: | Line 50: | ||
| Sherpa (jennifer.thompson@durham.ac.uk) | Sherpa (jennifer.thompson@durham.ac.uk) | ||
| - | 4) Calculation of the ratio for sigma(pp -> Z/gamma*+jets)/sigma(pp -> gamma+jets) and comparison to data | + | ==== 4) Calculation of the ratio for sigma(pp -> Z/gamma*+jets)/sigma(pp -> gamma+jets) and comparison to data ==== |
| contributors (contact persons): | contributors (contact persons): | ||
| Line 52: | Line 59: | ||
| Sherpa (jennifer.thompson@durham.ac.uk) | Sherpa (jennifer.thompson@durham.ac.uk) | ||
| - | Parameters according to CMS paper [[http://arxiv.org/abs/1505.06520|arXiv.1505.06250]] | + | Parameters according to CMS paper [[http://arxiv.org/abs/1505.06520|arXiv.1505.06250]], now published [[http://dx.doi.org/10.1007/JHEP10(2015)128|JHEP 10 (2015) 128]] |
| + | **NEW!** Link to the Rivet analysis file and plots:{{:2015:groups:tools:cms_2015_i1372730.tar|}} | ||
| + | * There are three plugins: | ||
| + | * CMS_2015_I1372730_Z: Z only plots | ||
| + | * CMS_2015_I1372730_G: gamma only plots | ||
| + | * CMS_2015_I1372730: all plots including ratios | ||
| + | * the plugin with the ratio plots can only be run on a sample with both Z and gamma events with correct relative cross-section | ||
| + | * otherwise to get the ratio plots one should run the first two plugins and then make the ratio (will try to provide a script, but just send the plots to vitaliano.ciulli@cern.ch and I will do it) | ||
| + | |||
| Selection cuts for the ratio plots: | Selection cuts for the ratio plots: | ||
| * For $Z/\gamma^{*}$ plus jets events we select: | * For $Z/\gamma^{*}$ plus jets events we select: | ||
| - | * two same flavour opposite sign leptons with $p_{T} > 20$ GeV and $|\eta| < 1.4$ and $71 < M_{\ell\ell} < 121 $ GeV and $p_{T}^{\ell\ell} > 100$ GeV | + | * two same flavour opposite sign leptons with $p_{T} > 20$ GeV and $|\eta| < 2.4$ and $71 < M_{\ell\ell} < 111 $ GeV and $p_{T}^{\ell\ell} > 100$ GeV |
| * leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$ | * leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$ | ||
| * at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$, we remove jets within a radius of $\Delta R < 0.5$ with respect to the axes of each lepton | * at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$, we remove jets within a radius of $\Delta R < 0.5$ with respect to the axes of each lepton | ||
| + | * for the ratio plots a cut on Z rapidity |y|<1.4 is also applied | ||
| * For $\gamma$ plus jets events we select: | * For $\gamma$ plus jets events we select: | ||
| - | * at least a photon with $p_{T} > 100$ GeV and $|\eta| < 1.4$ | + | * at least a prompt photon with $p_{T} > 100$ GeV and $|\eta| < 1.4$ (in case there is more than one photon the leading one satisfying all cuts is used) |
| * the photon must be isolated, i.e. the scalar sum of the $p_T$ of all stable particle in a cone of radius $\Delta R = 0.4$ is less then 5 GeV | * the photon must be isolated, i.e. the scalar sum of the $p_T$ of all stable particle in a cone of radius $\Delta R = 0.4$ is less then 5 GeV | ||
| * at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$ , we remove jets within a radius of $\Delta R < 0.5$ with respect to the axis of the photon | * at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$ , we remove jets within a radius of $\Delta R < 0.5$ with respect to the axis of the photon | ||
| Line 82: | Line 98: | ||
| * are scale uncertainties correlated among the two processes? | * are scale uncertainties correlated among the two processes? | ||
| * is someone interested in having a Rivet routine which runs at parton level? | * is someone interested in having a Rivet routine which runs at parton level? | ||
| + | |||
| + | Comparison of LO + approx EWK (M. Chiesa et al) to CMS Z/gamma ratio: | ||
| + | * {{:2015:groups:sm:rzg1_alpgen.pdf|V +>= 1 jet}} | ||
| + | * {{:2015:groups:sm:rzg2_alpgen.pdf|V +>= 2 jet}} | ||
| + | * {{:2015:groups:sm:rzg3_alpgen.pdf|V +>= 3 jet}} | ||
| ===== Input parameters ===== | ===== Input parameters ===== | ||
| Line 89: | Line 110: | ||
| ^ Parameters etc. ^ lljj ^ lvjj ^ ttH ^ | ^ Parameters etc. ^ lljj ^ lvjj ^ ttH ^ | ||
| | order of LO contribution | all | all | O(alphas**2 alpha) and O(alphas alpha**2) | | | order of LO contribution | all | all | O(alphas**2 alpha) and O(alphas alpha**2) | | ||
| - | | order of NLO corrections | O(alpha**3 alphas**2)| O(alpha**3 alphas**2) | NLO EW O(alphas**2 alpha**2) and NLO QCD | | + | | order of NLO corrections | O(alpha**3 alphas**2)|O(alpha**2 alphas**3) and O(alpha**3 alphas**2) | NLO EW O(alphas**2 alpha**2) and NLO QCD | |
| | renormalisation scheme | G_mu scheme | G_mu scheme | alpha(MZ) | | | renormalisation scheme | G_mu scheme | G_mu scheme | alpha(MZ) | | ||
| | complex/real masses | complex-mass scheme | complex-mass scheme | real masses | | | complex/real masses | complex-mass scheme | complex-mass scheme | real masses | | ||
| Line 107: | Line 128: | ||
| | alpha | calculated from G_mu| calculated from G_mu | 1/128.93 | | | alpha | calculated from G_mu| calculated from G_mu | 1/128.93 | | ||
| | MZ_onshell | 91.1876 GeV | 91.1876 GeV | 91.188 GeV | | | MZ_onshell | 91.1876 GeV | 91.1876 GeV | 91.188 GeV | | ||
| - | | GZ_onshell | 2.4952 GeV | 2.4952 GeV | 0 GeV | | + | | GZ_onshell | 2.4952 GeV | 2.4955 GeV | 0 GeV | |
| - | | MZ_pole, GZ_pole | calculated | calculated | - | | + | | MZ_pole, GZ_pole | calculated | - | - | |
| | MW_onshell | 80.385 GeV | 80.385 GeV | 80.385 GeV | | | MW_onshell | 80.385 GeV | 80.385 GeV | 80.385 GeV | | ||
| - | | GW_onshell | 2.085 GeV | 2.085 GeV | 0 GeV | | + | | GW_onshell | 2.085 GeV | 2.0897 GeV | 0 GeV | |
| - | | MW_pole, GW_pole | calculated | calculated | - | | + | | MW_pole, GW_pole | calculated | - | - | |
| - | | complex masses | defined from pole masses | defined from pole masses | - | | + | | complex masses | defined from pole masses | defined from on-shell masses | - | |
| | mb | 0 GeV | 0 GeV | 0 GeV | | | mb | 0 GeV | 0 GeV | 0 GeV | | ||
| | mt | 173.2 GeV | 173.2 | 173.3 GeV | | | mt | 173.2 GeV | 173.2 | 173.3 GeV | | ||
| - | | Gamma_t | 0 GeV | | 0 GeV | | + | | Gamma_t | 0 GeV | 1.339 | 0 GeV | |
| - | | MH | 125 GeV | 126 GeV | 125 GeV | | + | | MH | 125 GeV | 125 GeV | 125 GeV | |
| - | | Gamma_H | 0 GeV | 4.21 MeV | 0 GeV | | + | | Gamma_H | 0 GeV | 4.07 MeV | 0 GeV | |
| | basic cuts | pt_j > 30 GeV | pt_j > 30 GeV | | | | basic cuts | pt_j > 30 GeV | pt_j > 30 GeV | | | ||
| - | | | abs(y_j) < 4.5 | abs(y_j) < 4.5 | | | + | | | abs(y_j) < 4.5 | abs(eta_j) < 4.5 | | |
| - | | | pt_l > 20 GeV | pt_l > 20 GeV | | | + | | | pt_l > 20 GeV | pt_l > 25 GeV | | |
| - | | | abs(y_l) < 2.5 | abs(y_l) < 2.5 | | | + | | | abs(y_l) < 2.5 | abs(eta_l) < 2.5 | | |
| - | | | dR_ll > 0.2 | dR_ll > 0.2 | | | + | | | dR_ll > 0.2 | dR_jl > 0.5 | | |
| - | | | dR_jl > 0.5 | dR_jl > 0.5 | | | + | | | dR_jl > 0.5 | M_TW > 40 GeV | | |
| - | | | 66 GeV < M_ll < 116 GeV| M_TW > 20 GeV | | | + | | | 66 GeV < M_ll < 116 GeV| missing_ET > 25 GeV | | |
| - | | | | missing_ET > 30 GeV | | | + | | | | | | |
| - | | cumulative histogram 1 | pT(j1) > 0.25,0.5,0.75,1 TeV| pT(j1) > 1 TeV | | | + | | cumulative histogram 1 | pT(j1) > 0.25,0.5,0.75,1 TeV| pT(j1) > 0.5, 1 TeV | pt(H) and pt(t) and pt(tbar) > 200 GeV | |
| - | | cumulative histogram 2 | M_jj > 0.50,1,2,4 TeV | missing_ET > 1 TeV | | | + | | cumulative histogram 2 | M_jj > 0.50,1,2,4 TeV | missing_ET > 0.5, 1 TeV | pt(H) and pt(t) and pt(tbar) > 400 GeV | |
| - | | cumulative histogram 3 | pT(l-) > 0.25,0.5,0.75,1 TeV| pT(l) > 1 TeV | | | + | | cumulative histogram 3 | pT(l-) > 0.25,0.5,0.75,1 TeV| pT(l) > 0.5, 1 TeV | pt(H) > 500 GeV | |
| - | | cumulative histogram 4 | pT(ll) > 0.25,0.5,0.75,1 TeV | | | | + | | cumulative histogram 4 | pT(ll) > 0.25,0.5,0.75,1 TeV | | abs( y(t) ) > 2.5 | |
| - | | cumulative histogram 5 | HT > 0.50,1,1.5,2 TeV | HT > 2 TeV | | | + | | cumulative histogram 5 | HT > 0.50,1,1.5,2 TeV | HT > 0.5,1,2 TeV | | |
| Alternative lljj analysis: same as above with M_ll cut replaced by the following VBF cuts: M_jj > 600 GeV; abs(y_j1-y_j2) < 4.5; y_j1 * y_j2 < 0; min(y_j1,y_j2) < y_l < max(y_j1,y_j2). | Alternative lljj analysis: same as above with M_ll cut replaced by the following VBF cuts: M_jj > 600 GeV; abs(y_j1-y_j2) < 4.5; y_j1 * y_j2 < 0; min(y_j1,y_j2) < y_l < max(y_j1,y_j2). | ||
2015/groups/sm/nloew.txt · Last modified: 2016/03/01 18:04 by vitaliano.ciulli
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: Public Domain
