Gg initial states (Higgs, with NLM Higgs)

From Wiki Les Houches 09

(Difference between revisions)
Jump to: navigation, search
(Parameters/plots of the study number 1: Inclusive Higgs)
Current revision (15:17, 27 January 2010) (view source)
(Parameters/plots of the study number 2: Higgs + dijet)
 
(4 intermediate revisions not shown.)
Line 20: Line 20:
* jet-algorithm : kt with D=0.7, E-scheme (fastjet implementation from [http://www.lpthe.jussieu.fr/~salam/fastjet/ here])
* jet-algorithm : kt with D=0.7, E-scheme (fastjet implementation from [http://www.lpthe.jussieu.fr/~salam/fastjet/ here])
* Matched samples plots to be done after showering/before hadronization
* Matched samples plots to be done after showering/before hadronization
 +
* For the Higgs-effective coupling let's use the notation of [[http://cp3wks05.fynu.ucl.ac.be/twiki/bin/view/Software/HiggsEffective]] with tau=0, with a fixed value of alpha_S=0.120. NB: this is not compulsory as in some codes it is difficult to set this. Please quote what value you use in your datafile.
 +
Plots:
Plots:
-
* For the Higgs-effective coupling let's use the notation of [[http://cp3wks05.fynu.ucl.ac.be/twiki/bin/view/Software/HiggsEffective]] with tau=0, with a fixed value of alpha_S=0.120
 
 +
Jets are restricted to p_T>20, |eta|<4.5
0. Format : x y dy  (dy is just a placeholder for some kind of uncertainty.zero content bins should be dropped).
0. Format : x y dy  (dy is just a placeholder for some kind of uncertainty.zero content bins should be dropped).
-
1. Jet rates (from zero jets to 4 or 5 jets) (Pt>20, |eta|<4.5).
+
1. Jet rates (from zero jets to 5 jets)
2. Pt (pt) and and rapidity (y) of the Higgs:
2. Pt (pt) and and rapidity (y) of the Higgs:
Line 47: Line 49:
== Parameters/plots of the study number 2: Higgs + dijet ==
== Parameters/plots of the study number 2: Higgs + dijet ==
-
Jeppe and Stefan to fill this.  
+
Jeppe, Stefan and John to fill this.  
-
[FM: I want to mention that it would
 
-
be probably interesting to have also MCFM numbers here for H+2jet at NLO.
 
-
Maybe we should ask Giulia....
 
-
 
-
Jeppe: It certainly would be, but is currently not possible. hjj@NLO was never implemented in MCFM since the virtual corrections were evaluated using a (semi-)numerical method, which turned out to be too slow. John Campbell is currently working on implementing the recently calculated analytic form for the virtual currections]
 
  PDF: MSTW2008NLO
  PDF: MSTW2008NLO
Line 62: Line 59:
1. Average number of hard jets and tagjet azimuthal decorrelation vs. rapidity span
1. Average number of hard jets and tagjet azimuthal decorrelation vs. rapidity span
(Delta y_{ja jb} is rapidity difference between the most forward/backward hard jet)
(Delta y_{ja jb} is rapidity difference between the most forward/backward hard jet)
-
   <N_jet> vs Delta y_{ja jb} [0:8] in bins of 0.2 units of rapidity
+
   <N_jet> vs Delta y_{ja jb} [0:8] in bins of 0.25 units of rapidity
-
   <cos(Pi-DeltaPhi)> vs Delta y_{ja jb} [0:8] in bins of 0.2
+
   <cos(Pi-DeltaPhi)> vs Delta y_{ja jb} [0:8] in bins of 0.25
 +
 
 +
2. Distribution of rapidity difference between most forward/backward hard jet (and of hardest (in pt) and next-to-hardest jet). bin width of .25 units of rapidity, range 0-9.
The remaining studies require also  
The remaining studies require also  
  Delta y_{ja jb}>4., where jb is the backward and ja is the forward hard jet
  Delta y_{ja jb}>4., where jb is the backward and ja is the forward hard jet
-
 
-
2. Rapidity distribution of most forward/backward hard jet, and of hardest (in pt) and next-to-hardest jet.
 
3. Transverse momentum distribution for the Higgs boson
3. Transverse momentum distribution for the Higgs boson

Current revision

gg> H + jets study

People so far :

  • P. Skands,
  • F. Maltoni,
  • M. Mangano, Alpgen matched with PS
  • S. de Visscher, MG/ME matched with PS
  • J. Andersen, HE approach
  • C. Oleari, MC@NLO+POWHEG+HNNLO
  • J. Winter, S. Hoeche, SHERPA
  • K. Hamilton, HERWIG++ (+POWHEG)

Parameters/plots of the study number 1: Inclusive Higgs

  • CTEQ6M for NLO and NNLO results
  • CTEQ6L1 for LO results
  • 5 Flavours in the initial state
  • pp @ LHC10, mh=120
  • jet-algorithm : kt with D=0.7, E-scheme (fastjet implementation from here)
  • Matched samples plots to be done after showering/before hadronization
  • For the Higgs-effective coupling let's use the notation of [[1]] with tau=0, with a fixed value of alpha_S=0.120. NB: this is not compulsory as in some codes it is difficult to set this. Please quote what value you use in your datafile.

Plots:

Jets are restricted to p_T>20, |eta|<4.5

0. Format : x y dy (dy is just a placeholder for some kind of uncertainty.zero content bins should be dropped).

1. Jet rates (from zero jets to 5 jets)

2. Pt (pt) and and rapidity (y) of the Higgs:

      pt in [0:250] GeV bins of 10  GeV
      pt in [0:50] GeV bins of 2  GeV
      y in [-5.25 : 5.25] bins of 0.5 

3. pt jets and eta of jets and deltaR(i,j):

      1st  j pt [0:250] GeV  bins of 10 GeV
      2nd  j pt [0:150] GeV  bins of 10 GeV
      3rd  j pt [0:100] GeV  bins of 10 GeV
      4rd  j pt [0:100] GeV  bins of 10 GeV
      nth  j eta [-5.25:5.25] in bins of 0.5
      Delta12,23,34 in [0,5] in bins of 0.2

1. Ht_red and Ht

     a. Sum of pt_jets (no higgs) in [0:500] bins of 10 GeV
     b. Sum of pt_jets + pt higgs in [0:500] bins of 10 GeV

Parameters/plots of the study number 2: Higgs + dijet

Jeppe, Stefan and John to fill this.


PDF: MSTW2008NLO
Jet-algo: kt with D=0.7, min jet pt:40GeV, |y_j|<4.5
Require at least two jets
Higgs: |y_h|<4.5

1. Average number of hard jets and tagjet azimuthal decorrelation vs. rapidity span (Delta y_{ja jb} is rapidity difference between the most forward/backward hard jet)

  <N_jet> vs Delta y_{ja jb} [0:8] in bins of 0.25 units of rapidity
  <cos(Pi-DeltaPhi)> vs Delta y_{ja jb} [0:8] in bins of 0.25

2. Distribution of rapidity difference between most forward/backward hard jet (and of hardest (in pt) and next-to-hardest jet). bin width of .25 units of rapidity, range 0-9.

The remaining studies require also

Delta y_{ja jb}>4., where jb is the backward and ja is the forward hard jet

3. Transverse momentum distribution for the Higgs boson

  pt in [0:250] GeV bins of 10  GeV

4. Effects of central rapidity jet veto (a la Fig. 23 in arXiv:0808.3696, same binning i.e. [0:4] in 0.1 in y_c)

Personal tools