This afternoon looks to be about colliders (at least for me).
2:00 pm: Overview of Dark Matter searches and status in run 2 at the CMS experiment, DongHee Kim
A review of non-SUSY DM searches, focusing I think on Mono-X searches. Discussion of EFT limitations. Cut-off must be greater than Λ/2π to be consistent.
Mono-jets from ISR. Z/W plus jets main background, plus QCD misidentification. Latter extracted from single top and multi-jet events. Comparatively easy search. As usual, wins at low mass (<10 GeV) and in spin-dependent scattering channels.
Mono-photons, pretty similar including similar (origin of) backgrounds. 630 events vs 614 ± 63 expected. Weaker constraints (EM vs QCD) but still wins over DD as above.
Mono-W (mono-lepton). Sensitive to isospin nature of couplings. In particular, interference possible and can have strong effect. Constraints not strongly sensitive to SD vs SI, dark matter mass; very sensitive to interference. When constructive interference, actually stronger than mono-jet constraints.
Mono-top. RPV SUSY or FC top couplings. CMS (ATLAS) used hadronic (leptonic) tops.
ttbar plus MET.
Mono-Z (dilepton plus MET). Newest results of this type; not published yet. Order 100 events expected & seen. Conservative limits removing events with high momentum flow (do not trust EFT).
Discussion of breakdown of EFT. Run2 efforts for going beyond EFT to more reliable description: Simplified Models. In simplest UV complete models run1 limits don't change much, especially at low mass; in some cases stronger!
2:35 pm: The ATLAS detector: status and performance in run 2, Steven Schramm
Review of improvements in ATLAS detector, triggering and operation. Replaced or upgraded a lot of electronics and improved hermeticity for muon trackers. New IBL: trackers only 3.3cm from interaction point.
New triggering architecture; can actually record data at 1kHz (3GB/s). Record all events with jet pT > 400 GeV.
Early data from this year used to update detector alignment & description/MC.
IBL gives factor of 2 improvement in tracking.
B-jet rejection of light flavour jets 4 times better.
New MET algorithm, less sensitive to pile up.
Already (85 ipb) statistical uncertainties on W/Z cross sections comparable to theory uncertainties.
2:50 pm: Overview of Dark Matter searches at the ATLAS experiment, Bernhard Meirose
Higgs invisible width.
Hadronic mono-W/Z.
2:00 pm: Overview of Dark Matter searches and status in run 2 at the CMS experiment, DongHee Kim
A review of non-SUSY DM searches, focusing I think on Mono-X searches. Discussion of EFT limitations. Cut-off must be greater than Λ/2π to be consistent.
Mono-jets from ISR. Z/W plus jets main background, plus QCD misidentification. Latter extracted from single top and multi-jet events. Comparatively easy search. As usual, wins at low mass (<10 GeV) and in spin-dependent scattering channels.
Mono-photons, pretty similar including similar (origin of) backgrounds. 630 events vs 614 ± 63 expected. Weaker constraints (EM vs QCD) but still wins over DD as above.
Mono-W (mono-lepton). Sensitive to isospin nature of couplings. In particular, interference possible and can have strong effect. Constraints not strongly sensitive to SD vs SI, dark matter mass; very sensitive to interference. When constructive interference, actually stronger than mono-jet constraints.
Mono-top. RPV SUSY or FC top couplings. CMS (ATLAS) used hadronic (leptonic) tops.
ttbar plus MET.
Mono-Z (dilepton plus MET). Newest results of this type; not published yet. Order 100 events expected & seen. Conservative limits removing events with high momentum flow (do not trust EFT).
Discussion of breakdown of EFT. Run2 efforts for going beyond EFT to more reliable description: Simplified Models. In simplest UV complete models run1 limits don't change much, especially at low mass; in some cases stronger!
2:35 pm: The ATLAS detector: status and performance in run 2, Steven Schramm
Review of improvements in ATLAS detector, triggering and operation. Replaced or upgraded a lot of electronics and improved hermeticity for muon trackers. New IBL: trackers only 3.3cm from interaction point.
New triggering architecture; can actually record data at 1kHz (3GB/s). Record all events with jet pT > 400 GeV.
Early data from this year used to update detector alignment & description/MC.
IBL gives factor of 2 improvement in tracking.
B-jet rejection of light flavour jets 4 times better.
New MET algorithm, less sensitive to pile up.
Already (85 ipb) statistical uncertainties on W/Z cross sections comparable to theory uncertainties.
2:50 pm: Overview of Dark Matter searches at the ATLAS experiment, Bernhard Meirose
Higgs invisible width.
Hadronic mono-W/Z.
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