sergei shmatov, prospects of heavy di-muons physics at high luminosity lhc, rdms2011, alushta, 26...

Sergei Shmatov, Prospects of Heavy Di-muons Physics at High Luminosity LHC, RDMS2011, Alushta, 26 May 2011 1

Prospects of Heavy Dimuons Prospects of Heavy Dimuons Physics at High Luminosity LHCPhysics at High Luminosity LHC

Sergei ShmatovJoint Institute for Nuclear Research, Dubna

What do we learn with dimuons? Recent CMS Results Motivations for HL LHC HL LHC Requirements for Detectors HL LHC Discovery Potential

EGM, ADD, RS1, TeV-1

Summary

What Do We Learn with Dimuons?

Standard Model benchmark channel x-sections in new energy region

PDF constrains

forward-backward asymmetry and sin2W

Searching for New Physics Extended gauge models (many models inspired by GUT’s and left-

right symmetric models)

Extra Dimensions Large flat Extra-Dimensions (ADD model): multiple light graviton

states Randall-Sundrum with two branes in curved bulk space: heavy resonance states GKK TeV-1 Extra dimension Model with fermions are localized at the same (opposite) orbifold point: KK resonance states of Z-bosons

Compositeness

Standard Model benchmark channel x-sections in new energy region

PDF constrains

forward-backward asymmetry and sin2W

Searching for New Physics Extended gauge models (many models inspired by GUT’s and left-

right symmetric models)

Extra Dimensions Large flat Extra-Dimensions (ADD model): multiple light graviton

states Randall-Sundrum with two branes in curved bulk space: heavy resonance states GKK TeV-1 Extra dimension Model with fermions are localized at the same (opposite) orbifold point: KK resonance states of Z-bosons

Compositeness


Recent CMS Performance To Measure Dimuons and Results

(details were discussed in talk by Alexander Lanyov)


Muon Trigger and Reconstruction Performance

L1_SingleMu7 HLT_Mu15

CMS AN-10-317CMS AN-10-317

Cosmic-ray muon data

Trigger paths for 2x1032 Hz/cm2:Trigger paths for 2x1032 Hz/cm2:


CMS CR-2011/060 (2010 data)CMS CR-2011/060 (2010 data)

Re-Discovery of Standard Models in Dimuons

105 Drell-Yan candidates with M > 50 GeV

For M > 800 GeV expectation from Drell-Yan MC is 0.7 events.

CMS detected 1 event in μ+μ− channel — compatible with SM expectations.

105 Drell-Yan candidates with M > 50 GeV

For M > 800 GeV expectation from Drell-Yan MC is 0.7 events.

CMS detected 1 event in μ+μ− channel — compatible with SM expectations.

~ TeV


2011 data2011 data

New Limits for New Physics

Mass limits with 95 % CL

arXiv:1103.0981 ; CMS-EXO-10-013arXiv:1103.0981 ; CMS-EXO-10-013


High Luminosity LHC Expectations


LHC Luminosity Scenario

2020-2030 – High Lumi LHC

(High Luminosity (HL-LHC) Chamonix 2011)

• need to be able to integrate ~300 fb-1 per year (1 fb-1 per day) peak lumi of 1035 Hz/cm2

• the goal is to achieve 3000/fb in phase 2

2020-2030 – High Lumi LHC

(High Luminosity (HL-LHC) Chamonix 2011)

• need to be able to integrate ~300 fb-1 per year (1 fb-1 per day) peak lumi of 1035 Hz/cm2

• the goal is to achieve 3000/fb in phase 2

Mike Lamont,LHCC upgrade session, 16/02/10

1 fb-1 has to be delivered for June-July 2011

3x1033 Hz/cm2 at 7 TeV

Phase 2

~300 fb-1


HL LHC Motivations for Di-muons

Assume discovery of new phenomena at the LHC : study of some properties measured at LHC increase precision of resonance masses, partial width, spin and

coupling constants more precisely measurements of forward-backward asymmetry

to distinguish different models

Extend the reach for physics beyond the Standard Model:

Z’, q*, KK modes of graviton and gauge bosons non-resonance signals from ADD and compositeness

Assume discovery of new phenomena at the LHC : study of some properties measured at LHC increase precision of resonance masses, partial width, spin and

coupling constants more precisely measurements of forward-backward asymmetry

to distinguish different models

Extend the reach for physics beyond the Standard Model:

Z’, q*, KK modes of graviton and gauge bosons non-resonance signals from ADD and compositeness


General Detector Requirements

TeV muon in CMS muon stations

• new algorithms (or improvements)• new trigger paths for high energy

particles and higher PU (isolation!!!)• better understanding systematic effects

• new algorithms (or improvements)• new trigger paths for high energy

particles and higher PU (isolation!!!)• better understanding systematic effects


tracker is a crucial point punch-trough, bremsstrahlung and

EM showering lead to increasing of contaminated events in muon stations higher occupancy problems with isolation

tracker is a crucial point punch-trough, bremsstrahlung and

EM showering lead to increasing of contaminated events in muon stations higher occupancy problems with isolation

We need to keep detector performance for high-luminosity similar to present ones to maintain momentum resolution and efficiencyWe need to keep detector performance for high-luminosity similar to present ones to maintain momentum resolution and efficiency

Drell-Yan Measurements

Available masses ~ 3-3.5 TeV

Detector systematic effects are small wrt. to statistics at 300 fb-1

need more data !!!

AFB stat.

syst.

CMS PhTDR, V.II

CMS AN 2007/003


see Ilya Gorbunov’s talk on Tuesday

Spin-1 Neutral Resonances : Extended Gauge Models

LHC

SLHC

HL LHC Mass reach:~ 6.5 TeV/c2

CMS PhTDR, V.II

10 fb-1

models can be distinguished with AFB from each for resonances with up masses ~ 1 TeV

400 fb-1

Z’ models can be distinguished up to Z’ masses between 2.0-2.7

10 fb-1

models can be distinguished with AFB from each for resonances with up masses ~ 1 TeV

400 fb-1

Z’ models can be distinguished up to Z’ masses between 2.0-2.7

Mass reach for the LHC case (100 fb-1 /year):not better 4.9 TeV/c2 for most optimistic model

Mass reach for the HL LHC case(above 300 fb-1 /year:~ up to 6 TeV/c2 ,

Mass reach for the LHC case (100 fb-1 /year):not better 4.9 TeV/c2 for most optimistic model

Mass reach for the HL LHC case(above 300 fb-1 /year:~ up to 6 TeV/c2 ,

CMS NOTE 2005/022


Spin-1 Neutral Resonances: TeV-1 Extra Dimensions

5 discovery limit ofZKK Production

(M1 model)

LHC

LHC Mass reach:~ 6.0 TeV/c2

3000 fb-1

HL LHC Mass reach:~ 7.7 TeV/c2

S/(√B)>5 for Mll>Mcut

CMS PhTDR, V.II


TeV scale ED’s:KK excitations of the Z

Spin-2 Neutral Resonances: RS1 Discovery LimitDi-muon states

GG11μμ++μμ--

c=0.1100 fb-1

c=0.01100 fb-1

5D curve space with ADS metric: 3(brane)+1(extra)+time!

14

10 fb-1

1000 fb-1

HL LHC vs LHC, 95% CL


LHC HL LHC: Increase in reach up to 1.4 TeV

CMS PhTDR, V.II

Spin-1/Spin-2 Discrimination

Z vs RS1-graviton


CMS PhTDR, V.II

1 fb-1: 3.9-5.5 ТеV for n=6..310 fb-1: 4.8-7.2 ТеV for n=6..3100 fb-1: 5.7-8.3 ТеV for n=6..3300 fb-1: 5.9-8.8 ТеV for n=6..3

Confidence limits for LHC

Virtual graviton production

Confidence limits for HL LHC (3000 fb-1): 7 – 12 TeV

ADD Discovery Limit


CMS PhTDR, V.II

CMS shows good reconstruction performance measurements of dimuons: Data vs MC, efficiency, resolution

Expected dimuon physics within and beyond the SM for LHC Phase (up to 300 fb-1) is a very promising: discovery potential of CMS allows to test predictions of different models (SM, RS1, ADD, Z’) in the wide range of the model parameters

High Luminosity LHC (1035 Hz/cm2) can allow to study in details properties of new physics objects (masses, partial

width, spin, coupling constants) if they will be discovered to extend the reach for New Physics – gain in reach (for 1000 fb-1:

• up to 2 TeV for mass of resonances (~25-50% )• up to 4 TeV for MD (~ 50 % )

To exploit fully CMS potential the tracker and muon trigger must be changed/hardened/upgraded to maintain performances similar to present ones


Summary

Backup slides

Detectors: General Considerations


Summary of Physics Reach

17 Oct 200317 Oct 2003 Lankford – Trigger & Data AcquisitionLankford – Trigger & Data Acquisition

Inclusive Triggers: samples & ratesInclusive Triggers: samples & rates

LHC SLHC

Selection Threshold Rate Threshold Rate

(GeV) (kHz) (GeV) (kHz)

inclusive single muon 20 4 30 25

inclusive, isolated e/gamma 30 22 55 20†

muon pair 6 1 20 few

isolated e/gamma pair 20 5 30 5

inclusive jet 290 0.2 35 1

jet + missing ET 100+100 0.5 150+80 1-2

inclusive ET 150 <1

multi-jet triggers various 0.4 various low

Note that inclusive e/γ trigger dominates rate. (†Added degradation from pile-up not included above)

Sergei Shmatov, Prospects of Heavy Di-muons Physics at high luminosity, RDMS2011, Alushta, 26 May 2011 23

Physics Objects: Di-muons @ 7 TeV

TeV-1 Extra Dimension Model I. Antoniadis, PLB246 377 (1990)

Multi-dimensional space with orbifolding (5D in the simplest case, n=1)

The fundamental scale is not planckian: MD ~ TeV, EWPT MD > 4TeV

Fundamental fermions can be localized at the same (M1) or opposite (M2) points of orbifold destructive or constructive interference with SM model

I. Antoniadis, PLB246 377 (1990)

Multi-dimensional space with orbifolding (5D in the simplest case, n=1)

The fundamental scale is not planckian: MD ~ TeV, EWPT MD > 4TeV

Fundamental fermions can be localized at the same (M1) or opposite (M2) points of orbifold destructive or constructive interference with SM model

G. Azuelos, G. Polesello EPJ Direct 10.1140 (2004)

two electrons in the final state Bckg: Drell-Yan/ZZ/WW/ ZW/ttabr PYTHIA/PHOTOS with CTEQ61M LO + K=1.30 for signals, LO + K-factors for bckg. Full (GEANT-4) simulation/reco L1 + HLT(riger) cuts Theoretical uncert. Low luminosities pile-up

Non-resonant signals: ADD Model

N.Arkani-Hamed, S.Dimopoulos, G.Dvali (ADD scenario),Phys.Lett. B429(1998), Nuc.Phys.B544(1999)

The real World is multi-dimensional: n flat - Euclidian - extra spatial dimensions, the maximal

total number of dimensions is 3(our) + 6(extra)=9

The fundamental scale is not planckian: MD ~ TeV

We (all of SM forces) live on 3D brane (there is another “parallel” hidden World) Only gravitons are multi-dimensional

N.Arkani-Hamed, S.Dimopoulos, G.Dvali (ADD scenario),Phys.Lett. B429(1998), Nuc.Phys.B544(1999)

The real World is multi-dimensional: n flat - Euclidian - extra spatial dimensions, the maximal

total number of dimensions is 3(our) + 6(extra)=9

The fundamental scale is not planckian: MD ~ TeV

We (all of SM forces) live on 3D brane (there is another “parallel” hidden World) Only gravitons are multi-dimensional

A “Parallel” World

Our WorldExcess above di-lepton continuum!

Graviton contributions to SM processes: llqq llgg

d=2d=2

d=4d=4

SMSM

sm 1010~~ 17322

1

n

n

Pl

M

MMR

25Sergei Shmatov, Study of Heavy Di-muons with CMS, RDMS2010, Varna, 09 September 2010

from measurements of the gravitational potential n = 1 excluded by solar system (verification of the Newton’s law up to R < 0.19

mm) from supernova SN1987 (graviton emission speeds up the supernova

cooling): MD > 30 TeV (n = 2) , 4 TeV (n = 3)

from energy spectrum of the diffuse gamma-ray background (CDG) due to GKK γγ: MD > 110 TeV (n = 2) , 5 TeV (n = 3)

http://www-cdf.fnal.gov/physics/exotic/r2a/20071213.gammamet/LonelyPhotons/photonmet.html http://www-cdf.fnal.gov/physics/exotic/r2a/20071213.gammamet/LonelyPhotons/photonmet.html

PRL 101:181602 (2008) PRL 101:181602 (2008) PRL 97:171802 (2006) PRL 97:171802 (2006)

ADD Model: experimental exclusions


http://www-cdf.fnal.gov/physics/exotic/r2a/20071213.gammamet/LonelyPhotons/photonmet.html

http://www-cdf.fnal.gov/physics/exotic/r2a/20071213.gammamet/LonelyPhotons/photonmet.html

New resonances: RS1/TeV-1 ModelsL.Randall, R.Sundrum (RS1 scenario), PRL83 3370 (1999)

L.Randall, R.Sundrum (RS1 scenario), PRL83 3370 (1999)

5D curve space with AdS5 slice: two 3(brane)+1(extra)+time!

Signals:

Narrow, high-mass resonance states in di-lepton, di-jet, di-photon events:

Signals:

Narrow, high-mass resonance states in di-lepton, di-jet, di-photon events:

jetjet,,,eeGgg,qq KK

I. Antoniadis, PLB246 377 (1990): TeV-1

Multi-dimensional space with orbifolding

(5D in the simplest case, n=1)

The fundamental scale is not planckian:

MD ~ TeV

Gauge bosons can travel in the bulk

I. Antoniadis, PLB246 377 (1990): TeV-1

Multi-dimensional space with orbifolding

(5D in the simplest case, n=1)

The fundamental scale is not planckian:

MD ~ TeV

Gauge bosons can travel in the bulk

jetjeteeZqq KK ,,


CDF: PRL 102, 091805 (2009)CDF: PRL 102, 091805 (2009)

http://www-cdf.fnal.gov/physics/exotic/r2a/20081021.dimuon_resonance/ http://www-cdf.fnal.gov/physics/exotic/r2a/20081021.dimuon_resonance/

2.3 fb−12.3 fb−1

D0: D0note 5195-CONFD0: D0note 5195-CONF

1.1 fb−11.1 fb−1

New resonances: experimental exclusions


http://www-cdf.fnal.gov/physics/exotic/r2a/20081021.dimuon_resonance/

http://www-cdf.fnal.gov/physics/exotic/r2a/20081021.dimuon_resonance/

Features of high energy muons

Features of a muon of high energy (a few hundred GeV - TeV) low curvature of muon trajectory limited pT estimation precision bremsstrahlung and EM showering contaminated events, problems with isolation precision is sensitive extremally to detector misalignment

Features of a muon of high energy (a few hundred GeV - TeV) low curvature of muon trajectory limited pT estimation precision bremsstrahlung and EM showering contaminated events, problems with isolation precision is sensitive extremally to detector misalignment

TeV muon in CMS muon stations

new algorithms (or improvements), new trigger paths for high energy particles (no calorimeter isolation), better understanding systematic effects, tested with MC data and experimental data (cosmic muons and SPS beam)

new algorithms (or improvements), new trigger paths for high energy particles (no calorimeter isolation), better understanding systematic effects, tested with MC data and experimental data (cosmic muons and SPS beam)


SW Validation (GEANT-4)

SPS muon and pion beams (from 3 GeV up to 300 GeV) Tests of CMS simulation software (GEANT4-based) used for simulation of CMS detector response

2004 Beam test on -beams2004 Beam test on -beams

GEANT4-based SW is described experimental data well enough

Electromagnetic secondaries Punch-through


After selection cuts Drell-Yan dominates over other processes dijets, Wjets, ttbar, WW, WZ, ZZ

Theory:• QCD and EW high-order corrections (K factors)• Parton Distribution Functions (PDF)• QCD scale (Q2)

Detector• Misalignment • B-filed • Pile-up • Trigger and reconstruction• Shape of background

DYDY

Expected Uncertainties: Drell-Yan Example

smearing (long-term data)

smearing (long-term data)

Statistical errors are higher thandetector onesStatistical errors are higher thandetector ones

SM background is also computed for each integrated luminosity scenarios in dependence of physics tasks. Studies of BG processes assume:• Estimates of rates and optimization S/B-ratio by selection criteria• Estimates of theory- and detector-related uncertainties

SM background is also computed for each integrated luminosity scenarios in dependence of physics tasks. Studies of BG processes assume:• Estimates of rates and optimization S/B-ratio by selection criteria• Estimates of theory- and detector-related uncertainties

Drell-Yan

Theory-related uncertainties are dominant!!!

Need to be improved!!!


Muon Propagation

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