soft qcd at cms and atlas - institut national de physique...
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Soft QCD at CMS and ATLAS
Pavel Starovoitov
on behalf of the ATLAS and CMS Collaborations
Kirchhoff-Institut fur Physik, Heidelberg, Deutschland
March 22, 2018
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 1 / 16
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Introduction
Hadron-hadron collision eventhas very complicated structure
I Underlying eventI Multiple parton interactionI Soft radiationI Hadronisation
Soft QCD measurementsI Test our understanding of
physics at low-xI Improve modelling of hadron
collisionsI Crucial for LHC Run-2-3 and
HL-LHC R&D as well as forfuture colliders
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 2 / 16
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Inelastic cross-section @ 13 TeV(CMS)
2015√
s = 13TeV datasetlow pileup runsLint = 40.8µb−1 : B=3.8 TLint = 28.0µb−1 : B=0 T“zero bias” trigger(single/empty bunch triggersfor backgrounds)Event counts are corrected fordetector noise and pileupMeasurements are unfolded toparticle level
Runs Ncor/(NZB FZB) λ FiducialB = 3.8 T (%) cross section ( mb)
ξ > 10−6
254989 98.5 0.52 67.35 ± 0.05255019 99.9 0.54 67.66 ± 0.04255029 99.3 0.54 67.50 ± 0.04
Runs Ncor/(NZB FZB) λ FiducialB = 0 T (%) cross section ( mb)
ξX > 10−7 or ξY > 10−6
247324 98.5 0.05 68.88 ± 0.49247920 98.9 0.34 68.63 ± 0.08247934 98.8 0.32 68.63 ± 0.09
Summary of systematicuncertainties
σ(ξ > 10−6) σ(ξX > 10−7 or ξY > 10−6)( mb) ( mb)
Model dependence 0.68 0.39HF energy scale uncertainty 0.35 0.14CASTOR energy scale uncertainty — 0.04Run-to-run variation 0.15 0.14
Total 0.78 0.45
Integrated luminosity uncertainty 1.55 1.58
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 3 / 16
ξ = M2/s, M - inv. mass of diss. syst.
arXiv:1802.02613
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Inelastic cross-section @ 13 TeV(CMS)
-6 > 10ξ -6 > 10Y
ξ or -7 > 10X
ξ
[mb]
σ
65
70
75
80
85CMS ATLAS
EPOS LHC QGSJETII-04
PYTHIA6 Z2* (SS) PYTHIA8 CUETP8M1 (SS)
PYTHIA8 Monash (DL) PYTHIA8 MBR
13 TeVCMS
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 4 / 16
arXiv:1802.02613
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Diffractive processes contribution to forward photons
3h run in 12-13 June 2015stable pp
√s = 13 TeV
Lint = 0.19± 0.04 nb−1
µ ∼ 0.01,σinel = 78.1± 2.9 mb
one photon with Eγ > 200 GeVin LHCfno tracks in ATLASrejects non-diffract.contribution
I < 2% contributionI diffract. events purity ∼ 99%
Measurements are correctedfor photon and trackefficiencies and presented atthe particle level
First joint ATLAS and LHCfanalysis
trackN0 5 10 15 20 25 30 35 40 45 50
/LH
Cf t
rigge
rtr
ack
N
3−10
2−10
1−10
1PYTHIA8212DLATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs
DataMC folded (total)MC folded (diff.)MC folded (SD)
trackN0 1 2 3 4 5
/LH
Cf t
rigge
rtr
ack
N
0.00
0.05
0.10
0.15
0.20
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 5 / 16
ATLAS-CONF-2017-075
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Diffractive processes contribution to forward photons
region A : 10.94 < η; ∆φ < 180o
Photon Energy [GeV]
1000 2000 3000 4000 5000 6000
]-1
[GeV
γ/d
Eγ
dN
inel
1/N
11−10
10−10
9−10
8−10
7−10
6−10
5−10ATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs
°=180φ∆>10.94, η
Data LHCf-Arm1, arXiv:1703.07678
=0, ATLAS-CONF-2017-075chData N
Syst. + Stat. Unc. LHCf-Arm1
=0ch
Syst. + Stat. Unc. N
EPOS-LHC
QGSJET-II-04
SIBYLL2.3
PYTHIA8212DL
=0chEPOS-LHC N
=0chQGSJET-II-04 N
=0chSIBYLL2.3 N
=0chPYTHIA8212DL N
region B :8.81 < η < 8.99; ∆φ < 20o
Photon Energy [GeV]
1000 2000 3000 4000 5000 6000
]-1
[GeV
γ/d
Eγ
dN
inel
1/N
11−10
10−10
9−10
8−10
7−10
6−10
5−10ATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs
°=20φ∆<8.99, η8.81<
Data LHCf-Arm1, arXiv:1703.07678
=0, ATLAS-CONF-2017-075chData N
Syst. + Stat. Unc. LHCf-Arm1
=0ch
Syst. + Stat. Unc. N
EPOS-LHC
QGSJET-II-04
SIBYLL2.3
PYTHIA8212DL
=0chEPOS-LHC N
=0chQGSJET-II-04 N
=0chSIBYLL2.3 N
=0chPYTHIA8212DL N
photon spectrum with Nch = 0 requirement and inclusive Eγ (for comparison)
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 6 / 16
ATLAS-CONF-2017-075
−135o < φ < 45o
80o < φ < 100o
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Diffractive processes contribution to forward photons
region A :10.94 < η; ∆φ < 180o
Photon Energy [GeV]1000 2000 3000 4000 5000 6000
] γ/d
Eγ
=0)
] / [d
Nch
(N γ/d
Eγ
[dN
0
0.2
0.4
0.6
0.8
1ATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs°=180φ∆>10.94, η
Data LHCf-Arm1Syst. + Stat. Unc.EPOS-LHCQGSJET-II-04SIBYLL2.3PYTHIA8212DL
Pythia is too high. SYBILL 2.3 istoo low.
region B :8.81 < η < 8.99; ∆φ < 20o
Photon Energy [GeV]1000 2000 3000 4000 5000 6000
] γ/d
Eγ
=0)
] / [d
Nch
(N γ/d
Eγ
[dN
0
0.2
0.4
0.6
0.8
1ATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs°=20φ∆<8.99, η8.81<
Data LHCf-Arm1Syst. + Stat. Unc.EPOS-LHCQGSJET-II-04SIBYLL2.3PYTHIA8212DL
SYBILL 2.3 is too low. EPOS andPythia are in good agreement withdata
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 7 / 16
ATLAS-CONF-2017-075
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Dijet events with a large rapidity gap (CMS)
jet
jet
GAP
p
p
tracksN0 5 10 15 20 25 30 35
Eve
nts
40−
20−
0
20
40
60
80
100
120 CMS
= 100-200 GeV jet2
Tp (7 TeV)-18 pb
Data - background (NBD fit)
HERWIG 6 (normalized, no MPI)
2010 dataset√
s = 7 TeV
Lint = 8 pb−1
primary vertices Npr. vert. < 2two anti-kt R=0.5 jets:pT > 40 GeV; 1.5 < |ηjet| < 4.7ηjet1ηjet2 < 0Ntracks < 2(3) in |η| < 1 forpjet2
T < 100(200) GeVSource 40–60 GeV 60–100 GeV 100–200 GeVJet energy scale (up) −2.7 −3.8 −0.6Jet energy scale (down) +7.5 −9.6 +3.5Track pT threshold +5.9 +7.4 −1.7Tracks quality +0.5 −2.6 −0.8Background subtraction ±14.1 ±0.9 ±1.9
Total systematic −14.4,+17.1 −10.7,+7.5 −2.8,+4.0Statistical ±23 ±22 ±15
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 8 / 16
arXiv:1710.02586
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Dijet events with a large rapidity gap (CMS)pjet2
T range (GeV) 〈pjet2T 〉 (GeV) fCSE (%)
40–60 46.6 0.57± 0.13+0.09−0.08
60–100 71.2 0.54± 0.12+0.04−0.06
100–200 120.1 0.97± 0.15+0.04−0.03
(GeV)T
jet2p0 20 40 60 80 100 120 140 160 180
CS
E f
ract
ion
(%
)
0
0.2
0.4
0.6
0.8
1
1.2
Data| = 0.7%)2EEI (|S
| = 1.5%)2EEI (MPI, |S| from SCI)2EEI (MPI, |S
MT
< 1 ηGap region -1 < < 0 jet2η * jet1η
CMS
(7 TeV)-18 pb
jjη∆
3 3.5 4 4.5 5 5.5 6 6.5 7
CS
E f
ract
ion
(%
)0
0.5
1
1.5
2
2.5
Data| = 0.7%)2EEI (|S
| = 1.5%)2EEI (MPI, |S| from SCI)2EEI (MPI, |S
MT
< 1 ηGap region -1 < < 0 jet2η * jet1η
CMS
(7 TeV)-1 0.8 pb = 40-60 GeV jet2
Tp
pjet2T (GeV) 40–60 60–100 100–200
∆ηjj range 〈∆ηjj〉 fCSE (%) 〈∆ηjj〉 fCSE (%) 〈∆ηjj〉 fCSE (%)3–4 3.63 0.25± 0.20+0.15
−0.05 3.62 0.47± 0.19+0.09−0.02 3.61 0.78± 0.21+0.07
−0.124–5 4.46 0.41± 0.16+0.19
−0.13 4.45 0.47± 0.16+0.06−0.14 4.41 0.99± 0.23+0.11
−0.055–7 5.60 1.24± 0.32+0.11
−0.12 5.49 0.91± 0.32+0.07−0.30 5.37 1.95± 0.69+0.66
−0.29
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 9 / 16
MT= Mueller-TangEEI = Ekstedt-Enberg-Ingelman
arXiv:1710.02586
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Exclusive γγ → µ+µ− production (ATLAS)p
pp
p p
p p p
p'X
X
+
−
γ
γ
γ
γ
γ
γ
X'
''
µ
µ
+
−
µ
µ
+
−
µ
µ
p
p'
X
γ
γ
X
''
+
−
µ
µX
2015√
s = 13 TeV
two OS muons
I 12 GeV < mµµ < 70 GeVI pµT > 6 GeV in
12 GeV < mµµ < 30 GeVI pµT > 10 GeV in
30 GeV < mµµ
I pµµT < 2 GeVMuon track impact parameter(× sin θ) wrt event vertex< 0.5 mmVeto on additional chargedparticles activity
acoplanarity-µ+µ0 0.01 0.02 0.03 0.04 0.05 0.06
Eve
nts
/ 0.0
02500
1000
1500
2000
2500
ATLAS-1 = 13 TeV, 3.2 fbs
< 70 GeV-µ+µ12 GeV < m
Data
(post-fit)-µ+µ→γγExclusive
(post-fit)-µ+µ→γγS-diss -µ+µ→*γ + Z/-µ+µ→γγD-diss
acoplanarity-µ+µ0 0.01 0.02 0.03 0.04 0.05 0.06
Dat
a / M
C
0.81
1.2
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 10 / 16
Phys. Lett. B 777 (2018) 303
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Exclusive γγ → µ+µ− production (ATLAS)
Total cross sectionσexcl. fid.γγ→µµ = 3.12± 0.07(stat.)± 0.14(syst.) pb
σEPAγγ→µµ = 3.56± 0.05 pb σEPA, corr.
γγ→µµ = 3.06± 0.05 pbσ
SuperChic2γγ→µµ = 3.45± 0.05 pb
Differential cross section
[GeV]-µ+µm0 10 20 30 40 50 60 70
[pb/
GeV
]- µ
+ µ /
dmσd
0.05
0.1
0.15
0.2
0.25
0.3
-1 = 13 TeV, 3.2 fbsATLAS
DataStat. uncertainty
syst. uncertainty⊕Stat.
EPASuperChic2EPA + finite-size correctionTheory uncertainty
[GeV]-µ+µm0 10 20 30 40 50 60 70T
heo.
/ Dat
a
0.91
1.11.2
s> / -µ+µ<m
-310 -310×2 -310×3 -210
EP
Aσ
/ m
eas.
σ
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
ATLAS
< 70 GeV-µ+µ = 13 TeV, 12 < msATLAS
> 11.5 GeV-µ+µ = 7 TeV, msCMS
> 20 GeV-µ+µ = 7 TeV, msATLAS
> 45 GeV-µ+µ = 8 TeV, msATLAS
EPA + finite-size correctionSuperChic2
Stat. uncertainty syst. uncertainty⊕Stat.
Theo. uncertainty
-310×5
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 11 / 16
Phys. Lett. B 777 (2018) 303
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Constraints on the double parton scattering fromsame-sign WW production (CMS)
2012√
s = 8 TeV
Lint = 19.7 fb−1
same-sign µµ and eµ pairs (ee is notconsidered due to charge misID)
Dimuon channel Electron-muon channelPair of same-sign leptons
Leading lepton pT > 20 GeVSubleading lepton pT > 10 GeV
No third isolated and identified lepton with pT > 10 GeVpmiss
T > 20 GeVm`` > 20 GeV
m`` /∈ [75, 105] GeV —|pTµ1
|+ |pTµ2| > 45 GeV —
— No b-tagged jet with pT > 30 GeV and |η| < 2.1
Background evaluationRegion 1 Region 2Only one loose lepton with pT > 10 GeV Only one loose lepton with pT > 10 GeVmT(`, pmiss
T ) < 20 GeV mT(`, pmissT ) < 20 GeV
pmissT < 20 GeV pmiss
T < 20 GeV— At least one b-tagged jet with pT > 30 GeV
and |η| < 2.1
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 12 / 16
JHEP 02 (2018) 032
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Constraints on the double parton scattering fromsame-sign WW production (CMS)
Multivariate analysis
BDT output0.8− 0.6− 0.4− 0.2− 0
Dat
a/M
C
00.5
1
1.52
BDT
0.8− 0.6− 0.4− 0.2− 0
Eve
nts/
bin
2−10
1−10
1
10
210
310
410
510
610
710 prompt-misid. WW DPS Datamisid-misid. WW SPS Syst⊕Stat WZ/ZZ *γW
±µ±µ
CMS (8 TeV)-119.7 fb
σeff >σ2
W + +σ2W−
2σDPSW±W±
= 12.2mb
compatible with othermeasurements
[pb]DPS±W±W
σ95% CL Limit on 0 0.5 1 1.5 2 2.5 3
Combined
µe
µµ
Observed LimitExpected Limit
1 s.d.±Expected 2 s.d.±Expected
PYTHIA 8 predictionFactorization approach
CMS (8 TeV)-119.7 fb
95% CL Dimuon Electron-muon CombinedExpected 0.67 pb 0.78 pb 0.48 pbExpected ±1σ [0.46, 1.00] pb [0.52, 1.16] pb [0.33, 0.72] pbExpected ±2σ [0.34, 1.45] pb [0.37, 1.71] pb [0.24, 1.04] pb
Observed 0.72 pb 0.64 pb 0.32 pb
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 13 / 16
JHEP 02 (2018) 032
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Ordered hadronic chains (ATLAS)
2010√
s = 7 TeV
Lint = 190 µb−1
Prim. vert. with Ntr > 2 . Noother prim. vert. with Ntr > 3track impact param < 1.5 mmvrt prim. vert.→ 10 mio events with 200 miotracks
correlation functions:
∆(Q) = 1Nch
[N(Q)OS − N(Q)LS
] Q [GeV]
-110 1(Q
)6
0
0.002
0.004
0.006 -1bµ= 7 TeV, 190 sData,
inclusive6
< 0.59 GeV3h, m3h6
region of adjustment
ATLAS
∆3h(Q) = 1Nch
Nev∑k=1
nkch∑
i,j=1,i 6=jωi
{12δ(Q −Q i
01) + 12δ(Q −Q i
12)− δ(Q −Q i02)}
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 14 / 16
Phys. Rev. D 96 (2017) 092008
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Ordered hadronic chains (ATLAS)
CS = −∫
∆<0 ∆(Q)dQCCS
(mcut
3h
)= −
∫∆3h<0 ∆3h(Q)dQ
Parameter mcut3h (input)
[MeV] 580 590 600 interpolationCCS/CS ±σ(stat) 0.88 ± 0.02 0.99 ± 0.02 1.09 ± 0.02 1.00 ± 0.02 (stat) ± 0.07 (syst)mcut
3h adjusted 591 ± 2 (stat) ± 7 (syst)
Q [GeV]0.2 0.4 0.6 0.8 1
(Q)
6
0
0.002
0.004
0.006
DataHerwig++ PYTHIA8 PYTHIA8, rank diff < 2
-1bµ= 7 TeV, 190sATLAS
Q [GeV]0.1 0.2 0.3
(Q)
3h6
-0.001
0
0.001
DataHerwig++PYTHIA8
ATLAS
-1bµ = 7 TeV, 190 s
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 15 / 16
Phys. Rev. D 96 (2017) 092008
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Summary
Measurements in soft QCD play an important role in validatingtheory predictions and tuning model parametersThis talk presents recent ATLAS and CMS results on
I Inelastic cross sectionI Double parton scatteringI Diffractive processesI Exclusive productionI Hadronisation
More resultsI https://cms-results.web.cern.ch/cms-results/public-
results/publications/FSQ/index.htmlI https://twiki.cern.ch/twiki/bin/view/AtlasPublic/StandardModelPublicResults
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 16 / 16
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Back-up
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 17 / 16
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Diffractive processes contribution to forward photons
trackN0 5 10 15 20 25 30 35 40 45 50
/LH
Cf t
rigge
rtr
ack
N
3−10
2−10
1−10
1EPOS-LHCATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs
Data
MC folded (total)
MC folded (diff.)
MC folded (SD)
trackN0 1 2 3 4 5
/LH
Cf t
rigge
rtr
ack
N
0.00
0.05
0.10
0.15
0.20
trackN0 5 10 15 20 25 30 35 40 45 50
/LH
Cf t
rigge
rtr
ack
N3−10
2−10
1−10
1QGSJET-II-04ATLAS-LHCf Preliminary
-1 = 13 TeV, 0.191 nbs
DataMC folded (total)MC folded (diff.)MC folded (SD)
trackN0 1 2 3 4 5
/LH
Cf t
rigge
rtr
ack
N
0.00
0.05
0.10
0.15
0.20
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 18 / 16
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Dijet events with large rapidity gap
tracksN0 10 20 30 40 50 60 70 80
Eve
nts
1
10
210
310CMS
(7 TeV)-10.05 pb = 40-60 GeV jet2
Tp
Data
> 3)tracks
PYTHIA 6 (normalized for N
= 0)tracks
HERWIG 6 (normalized at N
tracksN0 10 20 30 40 50 60 70 80
Dat
a/(H
ER
WIG
6+P
YT
HIA
6)
0
0.5
1
1.5
2
tracksN0 10 20 30 40 50 60 70 80
Eve
nts
1
10
210
310CMS
(7 TeV)-10.41 pb = 60-100 GeV jet2
Tp
Data
> 3)tracks
PYTHIA 6 (normalized for N
= 0)tracks
HERWIG 6 (normalized at N
tracksN0 10 20 30 40 50 60 70 80
Dat
a/(H
ER
WIG
6+P
YT
HIA
6)
0
0.5
1
1.5
2
tracksN0 10 20 30 40 50 60 70 80
Eve
nts
1
10
210
310CMS
(7 TeV)-18 pb = 100-200 GeV jet2
Tp
Data
> 3)tracks
PYTHIA 6 (normalized for N
= 0)tracks
HERWIG 6 (normalized at N
tracksN0 10 20 30 40 50 60 70 80
Dat
a/(H
ER
WIG
6+P
YT
HIA
6)
0
0.5
1
1.5
2
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 19 / 16
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Dijet events with large rapidity gap
(GeV)T
jet1p40 60 80 100 120 140 160 180 200 220
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30
= 0)tracks
Data (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 40-60 GeV jet2
Tp (7 TeV)-10.05 pb
(GeV)T
jet2p40 60 80 100 120 140 160 180 200
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30
= 0)tracks
Data (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 40-60 GeV jet2
Tp (7 TeV)-10.05 pb
(GeV)T
jet1p40 60 80 100 120 140 160 180 200 220
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30
= 0)tracks
Data (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 60-100 GeV jet2
Tp (7 TeV)-10.41 pb
(GeV)T
jet2p40 60 80 100 120 140 160 180 200
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30
= 0)tracks
Data (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 60-100 GeV jet2
Tp (7 TeV)-10.41 pb
(GeV)T
jet1p40 60 80 100 120 140 160 180 200 220
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30 = 0)tracks
Data (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 100-200 GeV jet2
Tp (7 TeV)-18 pb
(GeV)T
jet2p40 60 80 100 120 140 160 180 200
Eve
nts
/ 10
GeV
0
5
10
15
20
25
30 = 0)
tracksData (N
PYTHIA 6 (normalized)
HERWIG 6 (normalized)
CMS
= 100-200 GeV jet2
Tp (7 TeV)-18 pb
(GeV)T
jet2p0 20 40 60 80 100 120 140 160 180
CS
E f
ract
ion
(%
)0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
< 1 ηGap region -1 < < 0 jet2η * jet1η = 7 TeV)sCMS (pp,
(R = 0.5)t
| < 4.7, anti-kjet1,2η1.5 < |
= 1.8 TeV)s, pD0 (p
| < 4.1, Cone (R = 0.7)jet1,2η1.9 < |
= 1.8 TeV)s, pCDF (p
| < 3.5, Cone (R = 0.7)jet1,2η1.8 < |
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 20 / 16
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
Exclusive muon pair production
p
pp
p p
p p p
p'X
X
+
−
γ
γ
γ
γ
γ
γ
X'
''
µ
µ
+
−
µ
µ
+
−
µ
µ
p
p'
X
γ
γ
X
''
+
−
µ
µX
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 21 / 16
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
Exclusive muon pair production
Tracks associated with dimuon vertex10
Eve
nts
1
10
210
310
410
510
610
710
810 ATLAS-1 = 13 TeV, 3.2 fbs
Baseline selection
< 105 GeV-µ+µ70 GeV < m
Data model. uncertaintychDY N
-µ+µ→*γZ/Multijet
-τ+τ→*γZ/tt
-µ+µ→γγD-diss (post-fit)-µ+µ→γγS-diss
(post-fit)-µ+µ→γγExclusive
Tracks associated with dimuon vertex2 3 4 5 6 7 8 910 20 30 40
Dat
a / M
C
0.8
1
1.2 Tracks associated with dimuon vertex10
Eve
nts
1
10
210
310
410
510
610
710
810 ATLAS-1 = 13 TeV, 3.2 fbs
Baseline selection
> 105 GeV-µ+µor m
< 70 GeV-µ+µ12 GeV < m
Data model. uncertaintychDY N
-µ+µ→*γZ/Multijet
-τ+τ→*γZ/tt
-µ+µ→γγD-diss (post-fit)-µ+µ→γγS-diss
(post-fit)-µ+µ→γγExclusive
Tracks associated with dimuon vertex2 3 4 5 6 7 8 910 20 30 40
Dat
a / M
C
0.8
1
1.2
[GeV]-µ+µm0 20 40 60 80 100 120 140 160 180
Eve
nts
/ 5 G
eV
1
10
210
310
410
510
610 ATLAS-1 = 13 TeV, 3.2 fbs
+ 1 mm vertex isolationBaseline selection
Data model. uncertaintychDY N
-µ+µ→*γZ/Multijet
-τ+τ→*γZ/tt
-µ+µ→γγD-diss (post-fit)-µ+µ→γγS-diss
(post-fit)-µ+µ→γγExclusive
[GeV]-µ+µm0 20 40 60 80 100 120 140 160 180
Dat
a / M
C
0.8
1
1.2 [GeV]
-µ+µT
p0 5 10 15 20 25 30
Eve
nts
/ 0.7
5 G
eV
1
10
210
310
410
510
610 ATLAS
-1 = 13 TeV, 3.2 fbs
< 70 GeV-µ+µ+ 12 GeV < m+ 1 mm vertex isolationBaseline selection
Data model. uncertaintychDY N
-µ+µ→*γZ/Multijet
-τ+τ→*γZ/tt
-µ+µ→γγD-diss (post-fit)-µ+µ→γγS-diss
(post-fit)-µ+µ→γγExclusive
[GeV]-µ+µ
Tp
0 5 10 15 20 25 30
Dat
a / M
C
0.8
1
1.2
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 22 / 16
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
Hadronic chains
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 23 / 16
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
Hadronic chains
Q [GeV]
-110 1
(Q)
6
0
0.001
0.002
0.003
0.004-1bµ190 = 7 TeV sUncorrected data,
(inclusive) 6
< 0.54 GeV3h
, m3h6
< 0.59 GeV3h
, m3h6
< 0.64 GeV3h
, m3h6
ATLAS
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 24 / 16
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
.
Pavel Starovoitov (KIP HD) Soft QCD at CMS and ATLAS Moriond QCD 16 / 16