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Photons + MET Group: Gauge-Mediation Grid Strategy. Bruce Schumm UC Santa Cruz / SCIPP 29 August 2012 SUSY EtMiss Meeting. Gauge Mediation Grids for 7 TeV Analysis. squark/bino grid. gluino/bino grid. Nominal approach: More of same for 8 TeV; expect limits of (?) M gluino ~ 1400 GeV

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Photons met group gauge mediation grid strategy

Photons + MET Group: Gauge-Mediation Grid Strategy

Bruce Schumm

UC Santa Cruz / SCIPP

29 August 2012 SUSY EtMiss Meeting


Gauge Mediation Grids for 7 TeV Analysis

squark/bino grid

gluino/bino grid

Nominal approach:

More of same for 8 TeV; expect limits of (?)

Mgluino ~ 1400 GeV

Msquark ~ 1200 GeV

GM ~ 250 TeV

But perhaps one or two things to think about…

“SPS8” Trajectory


Impact of X(126) discovery on Gauge Mediation

  • Discussion with David Shih, Weds 22 Aug 2012

  • Rumors that Gauge Mediation would be scuttled by a Higgs at 126 GeV are exagerated

  • Higgs mass can be accommodated by modified “A terms”; this can make c appreciable, although c  mgluino-5

  • These can be radiatively generated (see http://www.umich.edu/~mctp/SciPrgPgs/events/2012/higgs/talks/Shih.pdf

  • Flavor universality in SUSY still an issue; still addressed by GM

  • Sensitivity to Mbino ~ Msquark/gluino a plus for ATLAS analysis (no jets required) but no physical motivation for focusing there.


mbino ~ mgluino Limit: Pushing GGM

  • From Helenka Przysiezniak-Frey (channeling Dan Damiani)

  • As mbino  m_gluino,

  • decay lengths get long

  • gluion  gluno + gravitino channel opens up (rather than bino + gravitino)

  • Control with gravitino mass, decoupling mass (everything but gluiono, bino)

  • here are some numbers for mdecouple = 2.5 TeV for    

  • mgluino = 800 GeV     mbino = 790 GeV

  • Mgravitino(GeV) Gam(gluino)(dec len) Gam(Neutralino1)   BF(gluino->gravitino+gl) 1.31877E-09    2.16920E-07 (GOOD)    1.99664E-07    9.99996E-01 (BAD) 1.31877E-07    2.24728E-11 (GOOD)    1.99664E-11     9.65250E-01 (BAD) 2.64510E-07     6.17294E-12 (GOOD)    4.96312E-12    8.73493E-01 (BAD) 4.43170E-07     2.70177E-12 (70 m)    1.76806E-12    7.10961E-01 (BAD) 8.85390E-07     1.26216E-12 (150 m)    4.42966E-13    3.81286E-01 (OK) 1.31877E-06    9.97837E-13 (190 m)    1.99664E-13    2.17389E-01 (BETTER) 6.59003E-06    7.89605E-13 (240 m)    7.99585E-15    1.10014E-02 (BEST)

  • My thinking: Stay with prompt analysis. Ignore theoretical tension and do whatever necessary to have prompt lifetime and tractable (small) direct gluonic decay rate.

  • 14 TeV data: 3D grids with c as third parameter?


The “Electroweak” Grid

  • Discussion with David Shih, 4 May 2012

  • Exploration of SPS8 trajectory should be

  • continued, but should also be generalized.

  • SPS8 cross section dominated by

  • weak production 101 and 1+1-

  • Scale of EW-production limits for

  • photonic decays in unclear!

  • Address with Wino/Bino grid:

  • MB / MW where B = bino ( 10 ); W = degenerate wino ( 1, 20)

  • Optimization will probably involve two SRs (low/high Bino mass)

  • Will start by assessing EW-only sensitivity with =250 TeV SPS8 point.


Current Grid Requests

  • In order to optimize, have requested of order 15 points with highest priority:

  • Full set of bino masses for mgluino = 1300 GeV

  • Full set of bino masses for msquark = 1100 GeV

  • SPS8 with  = 250 TeV

  • Will use this to optimize the gluino and squark grids, and to get first feel of EW sensitivity in preparation for definition of an “electroweak” wino/bino grid.

  • Will probably request high-priority generation of ~5 points with fixed wino mass, range of bino masses for optimization.

  • Will request full gluino, squark, wino grids sometime in future (deadlines?)


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