PRS-Analysis & PTDR Vol 2

Albert De Roeck (CERN) 1

PRS-Analysis & PTDR Vol 2

Albert De RoeckCPT AR 20/6

Vol II


Analysis PRS Groups

Deliverables: PTDR & Tools

Vol 2.1 First run plans Physics up to 1 fb-1

Vol 2.2 Full analyses: from raw data to Physics /Detector PRS driven

Vol 2.3 The physics of the 10 and 30 fb-

and asymptotic 300 fb-1

Submit April 2006 (depending on Cosmic Challenge time schedule)

New group: Generator Tools


1. Standard Model

Precision measurements of Standard Model processes and parameters


General:- good progress since spring this year as DSTs became available- started to work on early measurements and first 1 fb-1 physics (topics for Vol. II.1) - Comparisons of FAMOS with detailed simulation/reconstruction

Most topics reasonably well covered by active people except- QCD & jet physics (action being taken to improve on this)- Also still room for specific topics such as

-tt+ (top quark charge)-Top decays into particles-W/Z production & derivation of PDFs, ZZ final states in TGC

Problems:- MC production: some analyses not yet started because of missing signal MC e.g. ttbar J/Psi +X, spin correlation in ttbar, ...- Data access of large SM samples (FNAL...) still not smooth

Standard Model GroupJ. Mnich


good

bad

After our LR selection

event NOT weighted with its purity

mt(GeV)

top mass

Optimized selelectionTop mass fits• simple fit on this spectrum(the full sample)• ideogram technique(event-by-event)

J. d‘Hondt et al.

Top Mass

Mt

(input 175 GeV)

With PU

With Radiation

(nominal)

No PU

With Radiation

With PU

No Radiation

No PU

No Radiation

‘simple’ 172.4 ± 0.5 169.4 ± 0.4 179.2 ± 0.6 -

‘ideogram’ OSCAR

175.0 ± 0.5 172.4 ± 0.4 177.0 ± 0.4 -

‘ideogram’ FAMOS

- 177.2 ± 0.3 - 178.1 ± 0.2

Mass differences Mreduced by factor 3with new method

Affects systematicsuncertainty~20% of M

Full systematics under study

~1.6 fb-1all these numbers are correlated, hence differences are significant


A. Kyriakis, A.Giammanc

Leads to a limit of 410-3 in 10 fb-1 (20 times better than LEP)Improvements in progress (ttbar rejection)FAMOS analysis for high luminosity reach ongoing

FCNC: tZq Decay


S. Chatterji, H. Heath

Probe of the gluon structure at lower x and higher Q2 than before

Direct Photons

Analysis under way!This is first days physics!!


V. Andreev

•Event selection establishedThen:•Muon PT w.r.t. the B tagged jet to extract b events fraction•Fit procedure•Increase statistics•Electrons

Inclusive b-productionNew: First study on inclusive b-production started (b)


K. Mackay et al, A. Oh, V. Brigljevice.g. status W analysis

signal MC

Background:

Di-Boson production and TGCs


Forward physics and Diffraction

CMS+TOTEM prepare a LOI on diffraction, due for the LHCC of Nov 06 Forward detectors used: region 5<|| <7 calo+ tracker and TOTEM roman pots

Physics topics - Hard (& soft) diffraction, QCD and EWSB (Higgs), New Physics - Low-x dynamics and proton structure - Two-photon physics: QCD and New Physics - Special exotics (centauro’s, DCC’s in the forward region) - Cosmic Rays…

Example: di-jets in Double Pomeron Exchange ( < 0.1, H1 structure function) LHC pt> 10 GeV pt> 100 GeV pt > 500 GeV 1.2 106 pb 0.9 pb 5 10-4 pb Tevatron 1.3 105 pb

DiffractiveW Exclusive

Higgsproduction


2. Higgs Physics

H HZZ

What is the origin of Electro-weak Symmetry Breaking? If Higgs field at least one new scalar particle should exist: The Higgs One of the main missions of CMS: discover the Higgs for mH< 1 TeV


A few key results since last review

• Publications – A. Nikitenko, R. Kinnunen. S. Lehti, F. Moortgat, M. Spira,

“Measurement of the H/A-> cross section and possible constraint on tan()” CMS Note 2004/027, hep-ph/0503075.

– D. Dominici, G. Dewhirst, S. Gennai, L. Fano, A. Nikitenko, “Search for radion decays into Higgs boson pairs”, CMS Note 2005/007

– R. Kinnunen, S. Lehti, A. Nikitenko and P. Salmi, “On the discovery potential of the lightest MSSM Higgs Boson at LHC”, J. Phys. G: Nucl. Part. Phys. 31 (2005) 71-88.

• Very successful participation and collaboration with theorists in Les Houches 2005 meeting 2-20 May– H->WW group. A.-S. Giolo, G. Davatz, M. Zanetti, A. Nikitenko– Higgs with b quarks group, A. Kalinowski, S. Lehti, A. Nikitenko – VBF Higgs group, A. Nikitenko + M. Takahashi – tth group, S. Gascon– V. Drollinger (b fragmentation), A. Drozdetski (H->ZZ->4)

A. Nikitenko


General flow of progress

• HiggsAnalysis subsystem in ORCA is enlarged to 10 packages corresponding to individual channels

• Most of the datasets for PTDR have been requested

• First usage of ME+PS with ALPGEN2 for mass production: Z+2(3)j as bkg. to VBF Higgs. In collab. with M. Mangano and F. Piccinini

• Experimental and theor. systematics, generator uncertainties issues are being addressed for “hottest” channels

• Higgs boson cross sections and Brs to be used for PTDR are fixed together with scale and pdf uncertainties (with M. Spira, A. Djouadi, S. Heinemeyer)

• All important analyses well covered except • Heavy Higgses e.g. Zll or ll jetjet


General flow of progress

• Intensive use of LO ME generators for PTDR (ALPGEN, MadGraph, CompHEP); no MC@NLO datasets for PTDR but intensive generator level studies, comparison with PYTHIA and HERWIG to be prepared for “post PTDR production”

• Good collaboration with det. PRS (esp. with JetMET) • Most advanced channels

– SM H->ZZ(*)->2e2 D. Futyan, D. Giordano– SM H->WW(*)->2l, A.-S. Giolo, G. Davatz, M. Zanetti– MSSM H+ in tt~ M. Hashemi– MSSM H+ in gb->tH+, R. Kinnunen– MSSM A/H->, G. Masetti– MSSM A/H->->ll, S. Lehti

• Request still a few small number of missing datasets • Prepare first PTDR analyses for approval on September CMS week


Higgs Example: H->ZZ(*)->2e2

Beforeoffline selection

Afteroffline selection

mH=130 GeV mH=200 GeV

= 0 ± stat ± syst ± lum ± B

cross section measurement accuracy

Systematics and background being evaluated

D. Futyan and D. Giordano


Examples of Ongoing Studies

Exploring Zll+X using as a benchmark for A

ggbbA, ABackground fitted outside the region

S. LehtiG. Masetti


3. Beyond the SM

Supersymmetry Extra dimensions

New physics expected around the TeV scale Stabelize Higgs mass, Hierarchy problem, Unification of gauge couplings, CDM,…

+…


• Considerable progress since last AR– Better coverage of physics topics– Many signal samples have been produced– Will need larger + improved (NLO) SM bkgd samples – …and improved data access

• Many new results forthcoming– All based on OSCAR/ORCA and FAMOS

• CMS Notes and approved analyses– CMS Note 2004/024, 2005-002, CMS AN 2004/003, 2005/003 – CMS IN 2004-037, 2004-056, 2005-XXX (UED)

• Span many search areas:– SUSY, Z’, ED, Little Higgs, Technicolour, …– Still some weakly covered in GMSB, RPV, Little Higgs,

Technicolour• See SUSY/BSM group web page for topics + groups involved more information/updates @SUSYBSM web and http://cmsdoc.cern.ch/cms/PRS/susybsm/

L. Pape, M. Spiropulu

SUSY/BSM updateSUSY/BSM Update


• Only few highlights are listed here– See also the topics on the web

• Inclusive SS analysis approved

– Reach m1/2 > 500 GeV with 10 fb-1

– Continuing to extend analysis to larger m0

• Common test points have been defined– Cover various signatures, – Primarily for exclusive analyses– Low mass (LM) early discovery– High mass (HM) ultimate reach– Currently concentrate on LM

points

New SUSY Results

21H

21Z


• Final states with di-leptons (LM1) 0

2 ~l l l l 01 from

cascades– Required e± clean-up– Now e-e and - eff. mass– Start combining with jets

reconstruct all masses

02 ±

1 to trileptons (LM9)

• Direct 3-body 02 l l 0

1

• Will also study cascades

New SUSY Results

Opposite sign-same flavourdilepton edge for variousbenchmark points


• Final states with di-taus (LM2) s are soft: small (M-M0

1)

– Use hadronic decays– Important for Dark Matter studies

• Final states with Z0 ll (LM4)– Efficient rejection of bkgd, signal

easy to see

– Significance for 02 Z0 0

1 is 22 for 10 fb-1

• GMSB with heavy stable stau– Previous analysis with TOF

from muon DT being redone– New: measure dE/dx with ECAL

(FAMOS)

Signal event (opposite sign tau’s)Signal event (same sign tau’s)lm2 bkg (opposite sign tau’s)lm2 bkg (same sign tau’s)

M()

New SUSY Results


• High mass resonances into ee – Saturation in ECAL– Example: reach in RS model– Approved analysis

• Also RS graviton to – Reach ~4 TeV for c=0.1 at 30 fb-1

• High mass resonances into – Example: reach for Z’ models– Also performed analysis of

angular distributions (on peak only)

– Approved analyses

Z’ Resonances and Extra Dimensions


• Other final final states– Example: reach for ADD models

for effective Planck scale

( ploted results from virtual exchange)

• But many other searches for high mass resonances are ongoing– See topics on web page

• Search for UED– Parton level study completed– Now started full sim analysis

Z’ Resonances and Extra Dimensions


• Little Higgs– T t Z0, W leptonically or

hadronically– But small number of events

• Technicolour T W Z 3l

• Reach depends on T mass

T T

• Clear T peak

• Need to reconstruct T

T

Other BSM Channels


4. Heavy Ions

The quark-gluon plasma and more…


Heavy Ions Analyses

• Two analyses selected for Physics TDR– Quarkonium cross section (Bedjidian, Kodolova)

• High statistics “fast” simulation almost complete. Preliminary “mass spectra” using full detector acceptance, updated efficiency and resolutions available

• Full simulation background estimate simulation in progress, first results expected this week

– Jets rates and jet modification (C.Roland, + students: Lopez-Mateos, Platt)

• Tuning of a new generator complete– Careful centrality-dependent multiplicity and hard-collision

generation– Correct accounting of all produced particles

• All previous HI software issues are resolved – Pilot jobs of 2k Central and 10k min. bias PbPb events have been

generated and successfully reconstructed– These samples are used for PTDR Vol 1 performance studies

• Currently the generators are fine tuned for large scale production to study physics performance


%

Point 1: Both muons have 3 GeV<p<5 GeVPoint 2: Both muons have 5 GeV<p<10 GeVPoint 3: Both muons have 10 GeV<p<15 GeVPoint 4: Both muons have 10 GeV<p<15 GeV Both muons are in ||<0.7

Muon pair

Muon pair from B

Muon pair from K

Muon pair from

%

%

%

1

1

1

1

2

2

2

2

3

3

3

3

4

4

4

4

efficiency

purity

Efficiency and purityfor the

Reconstruction efficiency of muon pairs for different originFull simulation, including trigger efficiency


Quarkonium mass plots in Pb+Pb, “fast simulation”

Acceptance= 1.3%

S/B= 0.45

~120000 J/ /month

Acceptance= 27%

S/B= 0.09

~20000 /month

ORCA/OSCAR resolution ~ 85 MeV


Jet Simulation• The goal is to study parton energy loss in nuclear matter

• Channels under investigation:1. Charged particle spectra vs. collisions centrality 2. Jet spectra3. Fragmentation functions and Jet profiles

• Example Studies have been completed on generator level• Will be repeated on the full detector simulation once it is

completed• While the simulation is running (~2 month) the analysis will be

further optimized to increase sensitivity

1) 3)2)

Tuning of a new generator complete (Lokhtin, Snigirev, Petrushanko)


5. Generator Tools


New Group: MC Generator Tools

Deliverables:• Interfacing generators and generator tools with CMS software

– Documentation– Example jobs

• Cross section tables for processes (generator manual)• Including GENSER (LCG AA project generator library)• Replacing CMKIN “CMKIN++”• Introducing HepMC as MC event structure• LHAPDF for the proton structure function + uncertainties• Generator tuning subproject (P. Bartalini)

– In particular tuning/study of the systematics of the underlying event.

F. Moortgat, S. Slabospitsky


Event Generators

S. Slabospitsky et al.in preparation

New generator group web page

http://cmsdoc.cern.ch/cms/PRS/gentools/

Web pages for the differentgenerators used in CMS


Generator Tools

Transition HEPEVT to HepMC: (Weng, Stavrianakou)• HepMCInterface in COBRA • HepMC output implemented in CMKIN++• reading of HepMC input implemented in OSCAR• reading of HepMC input in FAMOS ongoing• HepMC interface in EDM being implemented

CMKIN++ : the C++ successor of CMKIN (Cuevas, Naves)• prototype CMKINInterface in COBRA• using GENSER (LCG) generator libraries• several output formats implemented (a.o. POOL)• optimizing interface with new EDM

Collaboration with LCG Generator Project :

• common forum for LHC Physics Generator related issues • GENSER (LCG generator library): interface with CMKIN tested;full deployment waiting for SCRAMv1• collaboration for development of generator level production framework


Generator Tools

C++ generators : • providing feedback from the experimental community to the authorsof the next generation Monte Carlo generators that are now being developed, e.g. PYTHIA8

Interfaces between various generator tools: • validation of SUSY Les Houches Accord & feedback• requests for new tools needed by the PRS-Analysis groups• requests for more compatibility between tools e.g. Les Houches workshop 2005

Tuning of multiple interactions and underl. event: (Bartalini et al)

• study/tuning of the systematics of the underlying event• proposal being discussed

• modifications to CMKIN to ensure consistent parameter use• testing of new PYTHIA6.3 UE model


Generator Tools

Dedicated generation of complex final state samples: Consistency/coherence; usable by many analysis groups

multi-jet final states (W/Z+ N jets, Njets, … N<=6) using state-of-the-art ALPGEN and ME/PS matching with PYTHIA (Cucciarelli, Ambroglini)

• new ALPGEN2.0 has been interfaced to CMKIN

• generation of samples is ongoing (CPU-time consuming)

W+Njets, N=0,1,2,3,4,5,6+

Z+Njets, N=0,1,2,3,4,5,6+

Njets, N=4,5,6+

tt+Njets, N=0,1,2+

bb+Njets, N=0,1,2,3,4,5,6+

WW,WZ,ZZ+Njets, N=0,1,2,3,4+

Z/W bb + Njets, N=0,1,2,3,4+

Z+Mc+Njets, M=2, N=0,1,2

bbbb +Njets, N=0,1,2,3,4+


The Physics TDR


Vol 2.1: Startup and first physics Startup scenarios and physics with up to 1 fb-1 with the startup detector

Proposed outline of Vol 2.1 • The Startup Landscape * The LHC startup * The startup detector• The Cosmic Challenge * Description of detector components * Commissioning, operation and results• From Pilot Run to Physics Startup * Startup calibration, Allignment and Reconstruction * Trigger commissioning * Basic startup measurements• Physics reach with 1 fb-1

* Standard Model * Physics Beyond the Standard Model * The Early Higgs Boson Search

P. Janot


Vol2.2 Full analyses

• ECAL/egamma– H Photon id; ultimate ECAL resolution– HZZ(*) Electron reco: golden, silver, bronze…

• Muons– HZZ(*)4 Muon id: golden, silver, bronze– HWW(*) High-stats dimuons; jet veto– Z’ High-PT muons

• HCAL/JetMET– SUSY (0.5 TeV) Jets, missing Et; at the Tevatron limit– qqH Forward jets; triggering– Z’jet-jet High-pt jets; dijet mass

• Tracker/btau– ttH B tagging; top reconstruction…– A/Htau-tau Tau tagging; trigger; backgrounds/eff– BS J/ Vertexing; low-pt tracking

• Heavy Ions– Quarkonia – Jet quenching effects

CMS physics object driven (photons, electrons, muons, etc..) Imitate “real life” to the greatest possible extend (allignement/calibration)

P. Sphicas


Vol2.3: Physics Reach

Outline of vol2.3• Standard model chapters

– Physics of Strong Interactions: QCD, B-physics and diffraction– Physics of Top Quarks– Electroweak Physics

• Higgs chapters– Standard Model Higgs Bosons– MSSM Higgs Bosons– Search for Higgs bosons in non-SUSY models

• SUSYBSM chapters – Supersymmetry– Extra Dimensions and New Vector Boson High Mass States– Selection of other BSM signatures

Physics reach with 30 fb-1 (10/100/300 fb-1)

ADR


Vol-II Progress

• PTDR Vol2 layout committed to CVS repository

• Timeline (basically take PTDR Vol1 and add 4 months)– Version of the layout ready 15/6 presentation to CMS

during the June CMS week– First draft to the collaboration 21 October (Friday) – Present to the collaboration during November CPT

week– Final Draft for March 2006 CMS meeting (cosmic

challenge?)– Submit in April 2006

• Addendum to the PTDR for Heavy Ion program – Submit end of 2006


Ongoing Projects for the PTDR

• Common significance/confidence limits– Brainstorm meeting led proposal/being circulated (use “LEP” CL

technique) • Systematic uncertainties

– On PDFs: use CTEQ6 error band prescription– Common numbers from detectors (Energy scales, …) being prepared– B-fragmen., Initial/final state radiation, Higher orders, EW

constants…• Since December 2004, discussion among the physics groups to align

requests from the working groups (signal, background) to give these datasets wider use and publicity

» MC production master in place

• LHC startup scenario specification – CMS agreed upon interpretation being worked out


Some Observations

• FAMOS used more widely in the last few months – But it needs to be completed (e.g with pile-up, further tuning..)– PRS-analysis: take responsibilities/compare results full versus fast

• Reported Problems with the data file access using grid tools– Has improved since FNAL meeting but still a problem– We need to think of a replica strategy

• Production team does a great job, but sometimes production capacity gets saturated/long waits for “validating” new production chains– Delays in getting samples to users– Legalizing existing private samples/being investigated

• Most analysis for Vol 2 will be done with the present software– Maintenance/support must be guaranteed until at least TDR is out

• More work on Vol2.1 needed: – Starting in earnest now

• PRS-analysis contributors should also contribute to PRS detector or SW (e.g. analysis software). – Works to some level must still be improved


Summary• The Physics TDR is well under way• Plenty of activity in the PRS-analysis groups/significant progress

since last AR/ So far on track for the PTDR• Good training, uncovering of probs for the real thing starting in 2007• Still a lot of work to be done within the next 10 months

SUSY events (LM4 point: leptons, missing ET)

SUSY events (LM1 point: jets missing ET)

Micro-Black Hole

Documents

PRS-Analysis & PTDR Vol 2