Issues and Run-II Musings About the  +MET Analysis Osamu Jinnouchi (Tokyo Tech), Ryan Reece (SCIPP), Sheena Schier (SCIPP), Bruce Schumm (SCIPP) Prepared.

Slides:



Advertisements
Similar presentations
Searches for the Third Generation: SUSY with b-jets in ATLAS Searches for the Third Generation: SUSY with b-jets in ATLAS Monica D’Onofrio University of.
Advertisements

Search for Large Extra Dimensions at the Tevatron Bob Olivier, LPNHE Paris XXXVI ème Rencontre de Moriond Mars Search for Large Extra Dimensions.
Current limits (95% C.L.): LEP direct searches m H > GeV Global fit to precision EW data (excludes direct search results) m H < 157 GeV Latest Tevatron.
Search for Supersymmetry with early LHC data David Stuart, UC, Santa Barbara. May 12, 2010.
Update on the Diphoton + MET Analysis Basckground Bruce Schumm, Susan Fowler (Penn), Osamu Jinnouchi (Tokyo Tech), Khilesh Mistry (Penn), Tobias Orthen.
Recent Results on the Possibility of Observing a Standard Model Higgs Boson Decaying to WW (*) Majid Hashemi University of Antwerp, Belgium.
ESTIMATING THE FAKE LEPTON BACKGROUND IN A SEARCH FOR PAIR PRODUCED STOPS AT CMS David Kolchmeyer Advisor: Alberto Graziano.
Fourth Generation Leptons Linda Carpenter UC Irvine Dec 2010.
3.Phenomenology of Two Higgs Doublet Models. Charged Higgs Bosons.
1 Measurements at 8 TeV of TTbar events with additional particles in the final state Boris Mangano (ETH Zürich) on behalf of the CMS collaboration Boris.
1 Rutherford Appleton Laboratory The 13th Annual International Conference on Supersymmetry and Unification of the Fundamental Interactions Durham, 2005.
Physics with Photons and Missing Energy at ATLAS DOE Site Visit Wednesday July 27, 2011 Bangert *, Damiani, Kim, Kuhl, Litke, Mitrevski, Nielsen, Schumm.
Recent Electroweak Results from the Tevatron Weak Interactions and Neutrinos Workshop Delphi, Greece, 6-11 June, 2005 Dhiman Chakraborty Northern Illinois.
Basic Philosophy of SUSY Photons+MET Selection Bruce Schumm, SCIPP/UCSC SUSY 2011 Data Workshop 17 March 2011 n.b.: We are becoming a general photon +
LHC pp beam collision on March 13, 2011 Haijun Yang
Sept 30 th 2004Iacopo Vivarelli – INFN Pisa FTK meeting Z  bb measurement in ATLAS Iacopo Vivarelli, Alberto Annovi Scuola Normale Superiore,University.
Hasty Overview of Photon + MET Studies in the Context of GMSB Bruce Schumm Joint SUSY/UED Meeting 23 November 2010.
Update from the Photons + MET Group Bruce Schumm UC Santa Cruz / SCIPP 11 March 2010.
Motivations for a  +MET Trigger EGamma and (separately) MET Trigger Meetings 08 Feb 2011 Bruce Schumm, SCIPP/UCSC, For the SUSY Photon + MET Group.
W/Z + jets in ATLAS Pierre-Hugues Beauchemin University of Oxford
Snapshot of Photon + MET Trigger Studies Bruce Schumm, SCIPP/UCSC SUSY Trigger Meeting 14 December 2010.
Update from the Photons + MET Group Bruce Schumm UC Santa Cruz / SCIPP 26 August 2010 SUSY/MET Meeting.
DØ Higgs II Gordon Watts for the collaboration. 2 Gordon Watts (UW Seattle) WIN’ /07/2003 Outline Channels H  WW * H  H ++ H --  +  +  -
Jake Anderson, on behalf of CMS Fermilab Semi-leptonic VW production at CMS.
Heavy charged gauge boson, W’, search at Hadron Colliders YuChul Yang (Kyungpook National University) (PPP9, NCU, Taiwan, June 04, 2011) June04, 2011,
W properties AT CDF J. E. Garcia INFN Pisa. Outline Corfu Summer Institute Corfu Summer Institute September 10 th 2 1.CDF detector 2.W cross section measurements.
H → ZZ →  A promising new channel for high Higgs mass Sara Bolognesi – Torino INFN and University Higgs meeting 23 Sept – CMS Week.
Oxford ATLAS SUSY group
By Mengqing Wu XXXV Physics in Collision September 15-19, 2015 University of Warwick Dark matter searches with the ATLAS detector.
Z AND W PHYSICS AT CEPC Haijun Yang, Hengne Li, Qiang Li, Jun Guo, Manqi Ruan, Yusheng Wu, Zhijun Liang 1.
SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses Annecy DESY/University of Hamburg Liverpool University Tokyo.
C. K. MackayEPS 2003 Electroweak Physics and the Top Quark Mass at the LHC Kate Mackay University of Bristol On behalf of the Atlas & CMS Collaborations.
LHC France 2013, 3 rd April ATLAS results on inclusive top quark pair production cross section in dilepton channel Frédéric Derue, LPNHE Paris Rencontres.
QCD and Top backgrounds in W+jets and Rjets Alessandro Tricoli (CERN) on behalf of W+jets and Rjets groups 3 rd May 2013 W+jets and Rjets EB Meeting.
Update on the Diphoton + MET Analysis Basckground Bruce Schumm, Osamu Jinnouchi (Tokyo Tech), Ryan Reese (SCIPP), Sheena Schier (SCIPP) 26 August 2014.
Diphoton+MET 2015: Tasks and Timelines A living document… Bruce Schumm SCIPP.
Precision Cross section measurements at LHC (CMS) Some remarks from the Binn workshop André Holzner IPP ETH Zürich DIS 2004 Štrbské Pleso Štrbské Pleso.
December 3rd, 2009 Search for Gluinos and Squarks in events with missing transverse momentum DIS 2013: XXI. International workshop on Deep-Inelastic Scattering.
 DM Models & Signatures in CMS searches  Analyzing CMS data  MonoJet, MonoLepton, MonoPhoton, MonoTop, Top pairs  SUSY Searches  Perspectives for.
1 TOP MASS MEASUREMENT WITH ATLAS A.-I. Etienvre, for the ATLAS Collaboration.
Low scale gravity black holes at LHC Enikő Regős ( CERN )
Early LHC data preparations for SUSY searches at CMS Didar Dobur University of Florida Representing the CMS Collaboration ICHEP July 2010, Paris.
7/20/07Jiyeon Han (University of Rochester)1 d  /dy Distribution of Drell-Yan Dielectron Pairs at CDF in Run II Jiyeon Han (University of Rochester) For.
Diphoton + MET Analysis Update Bruce Schumm UC Santa Cruz / SCIPP 24 January 2014 Editorial Board Meeting.
Diphoton + MET Analysis Update Bruce Schumm UC Santa Cruz / SCIPP 03 July 2013 Editorial Board Meeting.
28/01/101 Zvv bkg, how to get an estimate with first data ? R. Brunelière Time schedule is tight. Goal : get an estimate by may/june if we get data from.
October 2011 David Toback, Texas A&M University Research Topics Seminar1 David Toback Texas A&M University For the CDF Collaboration CIPANP, June 2012.
1 Arnold Pompoš, SUSY03, Tucson, Arizona, June 5-10, 2003.
ATLAS Higgs Search Strategy and Sources of Systematic Uncertainty Jae Yu For the ATLAS Collaboration 23 June, 2010.
Update on the Diphoton + MET Analysis Basckground Bruce Schumm, Susan Fowler (Penn), Osamu Jinnouchi (Tokyo Tech), Khilesh Mistry (Penn), Tobias Orthen.
Randall- Sundrum Gravitons and Black Holes at the LHC Kevin Black Harvard University For the ATLAS and CMS Collaborations.
(Di-)Photon + MET Status and Plans for 5 fb -1 Analysis Who plans to contribute? DESY (Ehrenfeld, Wildt, Vankov) Annecy (Przysiezniak-Frey) Penn (Williams,
Costas Foudas, Imperial College, Jet Production at High Transverse Energies at HERA Underline: Costas Foudas Imperial College
Photon + MET Analysis Bruce Schumm UC Santa Cruz / SCIPP 05 August 2013 SUSY Review Talk.
Living Long At the LHC G. WATTS (UW/SEATTLE/MARSEILLE) WG3: EXOTIC HIGGS FERMILAB MAY 21, 2015.
1 UCSD Meeting Calibration of High Pt Hadronic W Haifeng Pi 10/16/2007 Outline Introduction High Pt Hadronic W in TTbar and Higgs events Reconstruction.
I'm concerned that the OS requirement for the signal is inefficient as the charge of the TeV scale leptons can be easily mis-assigned. As a result we do.
Photon Physics activities Higgs activities ATLAS LPNHE group meeting, 2011, Nov. 8th.
Physics with Photons and Missing Energy at ATLAS DOE Site Visit Thursday June 14, 2012 Damiani *, Kim, Kuhl, Litke, Mitrevski, Nielsen, Schumm (convener)
Diphoton+MET 2015: Overview of Path towards First Results A living document… Bruce Schumm SCIPP 18 May 2015.
Search for Pair Produced Stops Decaying to a Dileptonic Final State at CMS David Kolchmeyer.
Search for Standard Model Higgs in ZH  l + l  bb channel at DØ Shaohua Fu Fermilab For the DØ Collaboration DPF 2006, Oct. 29 – Nov. 3 Honolulu, Hawaii.
Upsilon production and μ-tagged jets in DØ Horst D. Wahl Florida State University (DØ collaboration) 29 April 2005 DIS April to 1 May 2005 Madison.
Update on the Diphoton + MET Analysis Bruce Schumm, channeling Ben Auerbach (Argonne), Osamu Jinnouchi (Tokyo Tech), Susan Fowler (Penn) UC Santa Cruz.
Royal Holloway Department of Physics Top quark pair cross section measurements in ATLAS Michele Faucci Giannelli On behalf of the ATLAS collaboration.
Fourth Generation Leptons Linda Carpenter April 2011.
Diphoton+X 2015: Overview of Plans and Goals
Photon(s)+X: Paper Draft Status
Diphoton+MET: Update on Plans and Progress
SUSY SEARCHES WITH ATLAS
Presentation transcript:

Issues and Run-II Musings About the  +MET Analysis Osamu Jinnouchi (Tokyo Tech), Ryan Reece (SCIPP), Sheena Schier (SCIPP), Bruce Schumm (SCIPP) Prepared for the Inclusive Strong Production Sept 2014 Oxford SUSY Workshop Live Page

September NOTE!!! This set of slides covers all the areas of the review within this single set. However, the sections are clearly separate out, and the background material provided by the other sections will likely help anyone reviewing them to understand what they are. Apologies…

September Conference Note public in early January 2014: Search for Supersymmetry in Diphoton Events with Large Missing Transverse Momentum in 8 TeV pp Collision Data with the ATLAS Detector ATLAS-CONF Final result in preparation

September Diphoton+MET Personnel (beginning of R2) Osamu Jinnouchi, Tokyo TechFaculty Ryan Reece, UCSC/SCIPPPost-doc Sheena Schier, UCSC/SCIPPPh.D. Graduate Student Bruce SchummFaculty XXX, Tokyo TechUnnamed Masters Student Possible additional contributors (encouragement welcome!) Khliesh Mistry, U. PennsylvaniaPh.D. Graduate Student Brig Williams, U. PennsylvaniaFaculty

September Summary of SRs SP (WP): Strong (Weak) production 1 (2): High- (low-) mass bino production MIS: Selection driven purely by expected background studies

September Summary of Backgrounds Data Driven Data- scaled MC Pure MC

September Opening Note: Diphoton+MET Triggers All Diphoton+MET SRs require two tight photons with E T > 75 GeV However, QCD control region makes use of a subset of [loose-tight] (as well as tight) photons with E T > 50 GeV The QCD control samples are statistically limited In RUNI, we used 2g40_loose trigger RUN2 proposal is medium photons of 35 and 25 GeV We have not had a chance to study the effect of the potential reduction in control sample sizes due to going from loose to medium.

September Section I: Data Driven Backgrounds Background A: QCD Define various control samples “t”  require 1 tight, iso photon “g” = pseudophoton (reverse two PID bits) “g” can be isolated or not QCDg QCDg+iso QCDtg QCDtg+iso  QCDtg+iso reproduces  MET dist well but limited statistics  QCDtg reproduces QCDtg+iso well at high MET, fair stats  QCDg provides high statistics but has higher tails

September Section I: Data Driven Backgrounds Background A: QCD Background estimated by applying all cuts save MET and then scaling control sample (QCDtg) to  distribution  Could work on quality of control sample agreement with  distribution (study effect of relaxing isolation requirement, etc.)  Could revisit contribution from true  background which does not have jet   fake and might have different MET distribution (but was seen to be small in prior versions of analysis)  Could think about new approach… ?

September Section I: Data Driven Backgrounds Background B: Electroweak Estimated via dedicated e  control sample scaled by measured e  fake rate (fairly standard) Studies show 25% of W/Z/t-  backgrounds do not have e  fake, but some of this expected to be incorporate in “QCD” background estimate  Adopt +-25% systematic uncertainty. Want to reduce with further study. M e  (converted photon) M e  (unconverted photon)

September Section I: Data Driven Backgrounds Background C: W  Irreducible Background Concern: very large K factor arises from elimination of a cancellation when gluon radiation included Associated with higher values of W  system recoil (p T,l  ) Our selection places all our W  background at high values of p T,l  Our MC model (Alpgen) not a full NLO model  Constrain W  contribution from data LO NLO

September Section I: Data Driven Backgrounds Background C: W  Irreducible Background Constrain W  K-factor for p T,l  > 100 Constrain K-factor with dedicated l  control sample W  contribution (white) includes x3 “enhancement factor” relative to Alpgen Actual analysis makes use of simultaneous fit to control and signal region, but in limit of 0 signal, W  floats up to about x3 in fit.

September Section I: Data Driven Backgrounds Background C: W  Irreducible Background However: *) Subsequent MC-based studies by Ben Kaplan showed good agreement between Alpgen and a full NLO calculation erial/slides/0.pdf *) A direct measurement (data!) of W  production in the SM Working Group, although in a slightly less restricted kinematic space (looser selection cuts) support the x3 enhancement factor at some level  Needs to be resolved Ben Kaplan  Can we use VBFNLO as a generator for our W  background samples?

September Section II: Direct Use of MC Use A: Direct Estimate of Z  Background Makes use of Sherpa for kinematic distributions Sherpa cross section corrected by ratio of Sherpa cross section to MadGraph NLO cross section calculation over same kinematic region Result used directly to estimate Z  backgrounds to both signal and l  control regions Scale uncertainty of 50% assumed – can this be reduced with further study?  Consider data-driven Z  study  Does SM group have corresponding analysis?

September Section II: Direct Use of MC Use B: Estimating Backgrounds to l  Con- trol Sample W , Z  Z  and ttbar-  backgrounds to the l  control sample are estimated directly from the MC All appropriate K-factors are used In the control region p T,l  they are small

September Section II: Direct Use of MC Potential Use C: Possible tt  Background At 13/14 TeV, might the tt  start to contribute at an appreciable level?  Need to explore this, perhaps even with new (?) dedicated MC sample.

September Section III: Signal Studies – Pointing vs. Non-Pointing Photons For prompt photon analyses (ours!), there is a tension between the bino decay length for low bino mass and direct decays of strongly produced states (gluinos, squarks) to gravitinos for high bino masses. Finessed by fine tuning of the coupling between SM and gravitational sectors – we have always felt this to be a bit unnatural Have talked for some time about making the bino lifetime a third dimension in the parameters space (e.g. a parameter space in the three dimensions of gluino mass, bino mass and bino lifetime) This would involve generating 3D grids and combining the prompt diphoton+MET and non-prompt-photon analyses Note that CMS already makes use of 3D parameter spaces – gluino mass, squark mass, bino mass – but the idea of having bino lifetime be a parameters in this manner would be both natural and unique to ATLAS.

September Section IV: Early Data Strategy Trigger Perspectives For Run 1 (8 TeV) we used 2g40_loose (two >40 GeV loose EM objects) Our offline SR selections made use of tight photons down to 75 GeV Our offline CR selections made use of tight and loose photons down to 50 GeV (lower E T needed to procure statistics  For our future analysis, we believe that the appropriate trigger will be 2gXX_loose where XX is as low as possible. It would be good to know ASAP what XX might be expected to be.

September Section IV: Early Data Strategy Follow-up on Run I Excess (?) Our WP2 selection identified 5 events over a background of 2.4  0.6  1.6 sigma excess May not warrant special attention but in the spirit of due diligence we point this out.