# Changes between Version 1 and Version 2 of MissETPlusJets

Ignore:
Timestamp:
04/06/12 16:33:02 (8 years ago)
Comment:

--

Unmodified
Removed
Modified
• ## MissETPlusJets

 v1 ===== II. Goal ===== To check if one could identify models from a specific signature. Imagine the LHC confirms the following signal:

p p > missing ET + jets To check if one could identify models from a specific signature. Imagine the LHC confirms the following signal:[[br]][[br]]p p > missing ET + jets What could one say from this? We know there would be many different models that would fit into this signature. Therefore, there are a few questions we would like to answer: * What could we affirm for the invisible particles from thes observables? (For example, the number of particle? The spin? If it is massive or massless?) To sumarize, the idea is to go from the signature -----> models, and not the usual other way around! To sumarize, the idea is to go from the signature -----> models, and not the usual other way around! ===== III. Strategy ===== First, we separe the production of invisible particles into 2 classes: production and decay. '''Production''': Pn => p p > X1 X2 .. Xn + jets (n from the number of invisibles) '''Production''': Pn => p p > X1 X2 .. Xn + jets (n from the number of invisibles) '''Decay''': Dn => p p > Y1 Y2 ... > X1 X2 .. Xn + jets '''Decay''': Dn => p p > Y1 Y2 ... > X1 X2 .. Xn + jets being X the invisible particles, and Y the parent particle which will generate the invisible particles. ===== V. Organization of the project: models separated into classes ===== ||

'''Model'''

||

'''Signature'''

||

'''Class'''

||

'''Mass'''

||

'''Spin'''

|| ||

RS

MGM

||

graviton + jets

||

Pn

P1

P1

||

massive

massive

massless

||

2

2

2

|| ||

Normal

SUSY

||

(squark > neutralino + jet)(squark > neutralino + jet)

(squark > neutralino + jets) neutralino

||

2*D1

P1.D1

|| || 1/2 || ||

SUSY GMSB

||

(gluino> gravitino+jet) (gluino > gravitino+jet)

(gluino> gravitino+jet) gravitino

(squark > neutralino+jet) (R-parity violating)

squark > (gluino > gravitino+jet) + jet (R-parity violating)

neutralino + jets (?)

||

2*D1

P1.D1

D1

D1

P1

||

||

3/2

3/2

1/2

3/2

1/2

|| ||

V` SM-like

||

V` + jet

||

P1

||

||

1

|| || '''Model'''

||

'''Signature'''

||

'''Class'''

||

'''Mass'''

||

'''Spin'''

|| || DD

RS

MGM

||

graviton + jets

||

Pn

P1

P1

||

massive

massive

massless

||

2

2

2

|| ||

Normal

SUSY

||

(squark > neutralino + jet)(squark > neutralino + jet)

(squark > neutralino + jets) neutralino

||

2*D1

P1.D1

|| || 1/2 || || USY GMSB

||

(gluino> gravitino+jet) (gluino > gravitino+jet)

(gluino> gravitino+jet) gravitino

(squark > neutralino+jet) (R-parity violating)

squark > (gluino > gravitino+jet) + jet (R-parity violating)

neutralino + jets (?)

||

2*D1

P1.D1

D1

D1

P1

||

||

3/2

3/2

1/2

3/2

1/2

|| || ` SM-like

||

V` + jet

||

P1

||

||

1

|| || 4F interaction || F + jet || P1 || || 1/2 || || S || S + jet || P1 || || 0 || ||

SM

||

Z > v vbar + jets

||

D2

||

||

1/2

|| || 4F + Dark || g q > chi chibar jet || P2 || || 1/2 || || M

||

Z > v vbar + jets

||

D2

||

||

1/2

|| || 4F + Dark || g q > chi chibar jet || P2 || || 1/2 || * We should take into account the possibility that the accompanying jets are either b's or coming from a top decay (like in the monotop paper). ===== VI. Summary of the discussions ===== ******** 04/11/2011 ****************** 04/11/2011 **g>********** The idea is to start by Johan's paper (ref [2]), doing the same analysis that they did (as an example) with each of the classes of models given above. They have separated into 4 searches: monojet + missET, dijet + missET, 3jets + missET and >4jets + missET. They have plotted the differential cross section as a function of two varibles: missET and HT. Finally they have summarized their differential cross section results in a grid formed by both variables. The idea is to start by Johan's paper (ref [2]), doing the same analysis that they did (as an example) with each of the classes of models given above. They have separated into 4 searches: monojet + missET, dijet + missET, 3jets + missET and >4jets + missET. They have plotted the differential cross section as a function of two varibles: missET and HT. Finally they have summarized their differential cross section results in a grid formed by both variables. (1) The choice of variables