Search for Pair Production of Scalar Leptoquarks with the CMS Experimen t
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Transcript of S. MuanzaMoriond QCD 2007 20 March 2007 Non SUSY Searches at the TEVATRON Run II OUTLINE I....
S. Muanza Moriond QCD 2007 20 March 2007
Non SUSY Searches at the TEVATRON Run II
OUTLINEI. INTRODUCTION II. FERMION SUB-STRUCTURE
• Search for Leptoquarks• Search for Leptons or Quarks Compositeness
III. EXTENDED GAUGE SYMMETRIES• Search for W’• Search for Z’
IV. EXTENDED NUMBER OF SPACE DIMENSIONS• Search for Randall-Sundrum gravitons• Search for Large Extra Dimensions
V. CONCLUSIONSVI. PROSPECTS FOR THE RUN II B
Steve MuanzaIPN Lyon, CNRS-IN2P3
on Behalf of the D0 & CDF Collaborations
S. Muanza Moriond QCD 2007 20 March 2007
NOTICE
• This talk is a NON EXHAUSTIVE overview of the numeroussearches for Exotic extensions of the SM at the TEVATRON Run II
• Each analysis status:• Prel.: preliminary• Acc.: accepted for publication• Pub.: already published
is mentioned in the last column of the tables. All exclusion limits are at the 95% CL
Not covered:• Technicolor• Littel Higgs• Model independent searches• CHAMPS• Monopoles,…
S. Muanza Moriond QCD 2007 20 March 2007
Extra D
SUSY
The Standard Model:• Gauge group: SU(3)c x SU(2)L x U(1)Y
• EWSB: the Higgs mechanism• Flavor symmetry: 3 generations of q & l• Space-Time symmetry: Poincaré group• Number of space D: 3
GUT
M-TheoryS-Strings
Compositeness
Technicolor
Little Higgs
4th generation fermions,excited fermions,LQ,…
techniparticles
SU(5), SO(10), E6, E8, …LQ, Z’, W’, …
Large, warped, TeV-1, UED,…
Higgs bosonssparticles
I. INTRODUCTION
Extending the SM
RGauginos / fermions TC
condensation
(3+1)-D [SU(2)L x U(1)Y
]N
N SU(2)L x U(1)Y
along the 4th space D
T, H triplet, W/Z/A,…
S. Muanza Moriond QCD 2007 20 March 2007
II. FERMIONS SUB-STRUCTURE
DECAY MODES:
Main search channels at the TEVATRON:
(0<i<4: generation index)
)( qLQBR
1)( qLQBR
iiiiii qqLQLQpp
iiiiii qqLQLQpp
iiiiii qqLQLQpp
PRODUCTION @ HADRON COLLIDERS:
• q+qbar LQ+LQbar• g+g LQ+LQbar• q+g LQ+l (smaller )
• independent of for SLQ (except for single LQ)=> (S,MSLQ)
• depends on 2 parameters G and G for VLQ
=> SVLQGG
SMGUT Compositeness
1. Search for LeptoQuarks
2
)1(2
2)1(
S. Muanza Moriond QCD 2007 20 March 2007
1. Search for LeptoQuarks
D0 CDF
• most results concern scalar LQ (simply denoted LQ) • just one result concerns vector LQ (denoted VLQ)
II. FERMIONS SUB-STRUCTURE
Channel Lint (pb-1) Status
VLQ3 pairs2+2b 322 06 Prel.
LQ2 pairs 2+2j 198 04 Pub
LQ2 pairs +2j 198 04 Pub
LQ1 pairs e+2j 200 04 Pub
LQ1 pairs e++2j 200 04 Pub
LQ1 pairs 2+2q 191 03 Pub
Scalar LQ1 pairs : comb. 3 analyses above
~200 05 Pub.
Scalar LQ2 pairs : comb. 2 analyses above
~200 06 Pub.
Channel Lint (pb-1) Status
LQ2 pairs ++2q 1050 07 Prel.
LQ3 pairs 2+2b 310 06 Prel.
LQ2 pairs 2+2q
LQ2+ 2+q
300 06 Acc.
LQ pairs 2+2q 370 06 Pub.
LQ2 pairs 2+2q 290 06 Pub.
LQ1 pairs 2e+2q
LQ1 pairs e++2q
252 04 Pub.
DetailedNote
S. Muanza Moriond QCD 2007 20 March 2007
Search for SLQ2
• D0: • Analysis: LQ2 pairsjets
• Triggers: single • Data sample: 1050 pb-1
• Instr. background: QCD from data• Event selection:
• exactly 1 hard & isolated • 2 hard jets and large mET
• large mT(, mET) and large HT
• Main BKGD: W()+jets• Uncert.: int. L, ), B norm., …
• Results: • Hyp:=0.5• Signal window: |mLQ +/-100 GeV|• Nobs= 6• Nexp(B)=6.4+/-0.7 +/-0.8• (S)=7.9+/-0.1+/-0.7 (mSLQ2 =200 GeV)mSLQ2>214 GeV
Reco’d mSLQ2
S. Muanza Moriond QCD 2007 20 March 2007
Searches for VLQ3 pairs
• CDF: • Analysis:
VLQ3 pairs 2+2b1 had., 1 e/
• Data sample: 322 pb-1
• Triggers: • lepton+tracks• +1 hard e/• +1 -had
• Event selection:• very large HT:pT(h+pT(l)+pT(b)+pT(b)+mET
• Uncert.: ISR, FSR, -ID, isolation,…
• Results: Hyp: Y-M coulings & =100%
e+had +had
Channel Nobs Nexp(B)
e+had+2b 0 0.25+0.22-0.08
+had+2b 0 0.24+0.23-0.07
mLQ3>251 GeV (Min. couplings)
mLQ3>317 GeV (Y-M couplings)
S. Muanza Moriond QCD 2007 20 March 2007
II. FERMIONS SUB-STRUCTURE
2. Search for Leptons & Quarks Compositeness
SM
Compositeness
Gauge Mediation O(1%)
• Parameters: • : comp. Scale• m(f*): mass of excited fermion• L: factors of left-handed currents
•Modifications of the */Z cross section:
42*
2
cos
CIf
dMd
dSM
jj
gCI 2
2
2L
Contact Interaction O(99%)
hceBY
gfWfgE
LR
]
2''
2[
2
L
• Parameters:• compositeness scale • f and f’ that depend on the composite dynamics• Me*
)(
**''**'
RLhc
ffffffj LLLLLLLLL
Ref.: U. Baur et al, Phys. Rev. D42 (1990) 815-824
O. Cakir et al., Eur. Phys. JC32S2 (2004) 1
S. Muanza Moriond QCD 2007 20 March 2007
II. FERMIONS SUB-STRUCTURE
2. Search for Leptons & Quarks Compositeness
D0
Channel Lint (pb-1) Status
e* e+ 1000 07 Prel.
q*q+Z(ee) 370 06 Pub.
*+ 380 06 Pub.
qqbarC 400 05 Prel.
qqbaree (CI) 271 04 Prel.
QCD Incl. Jet 800 06 Prel.
Channel Lint (pb-1) Status
*+ 371 06 Pub.
QCD Incl. Jet 1040 06 Prel.
CDF
Detailed
S. Muanza Moriond QCD 2007 20 March 2007
Search for Excited
• D0: • Analysis: qqbar
• Data sample: 380 pb-1
• Triggers: di-muons• Event selection:
• 2 hard (at least 1 isolated)• +1 hard & isolated
• Uncert.: trigger reco & ID,…
• Results:• m(*)>618 GeV for =1 TeV
m
m(GeV)
(TeV)
CI
S. Muanza Moriond QCD 2007 20 March 2007
Search for Excited e
• D0: • Analysis: qqbar e*e ee
• Data sample: 1 fb-1
• Triggers: single e & di-e• Event selection:
• at least 2 hard & isolated e• +1 hard & isolated CC or EC)• optimization: m(e) and R(e2,)
• Uncert.: QCD estimation, fake rate, PDF, …
• Results:• m(e*)>756 GeV for =1 TeV (CI)• m(e*)>793 GeV for =m(e*) (CI)
me
S. Muanza Moriond QCD 2007 20 March 2007
Inclusive Jet Cross Section
• CDF: • Analysis: QCD d/dydpT
• Data sample: 1.04 fb-1
• Triggers: j20, j50, j70, j100• Samples processing:
• Theory: NLO from EKS• Data:
• particle lvl corr. + unfolding• parton lvl corr.
• Event reconstruction:• midpoint 0.7 cone jets
• Event selection:•|y|<2.1• low mET significance•|zPV|<60 cm
• Uncert.: PDF, scale, UE & fragm.,…• Results:
• no explicit limit on comp. scale or m(q*)• yet, no excess at the highest pT ever probed
S. Muanza Moriond QCD 2007 20 March 2007
III. EXTENDED GAUGE SYMMETRIES
1. Search for W’
• Larger gauge group (E6, SO(10),…)• Hypotheses:
• No gauge mixing• Same CKM as in SM• DK into light
• WW
WW m
m '
' 3
4
SMGUT
L. Higgs
Ext. TC
Extra-D2. Search for Z’
• Larger gauge group: E6
• Z’cosZsin• suppose SM-like couplings
zz
zzm
m '
'
)1()1()5()1()10(6 UUSUUSOE
YLC USUSUSU )1()2()3()5(
S. Muanza Moriond QCD 2007 20 March 2007
III. EXTENDED GAUGE SYMMETRIES
1. Search for W’
2. Search for Z’
Channel Lint (pb-1) Status
W’e 205 06 Pub.
CDF
Channel Lint (pb-1) Status
W’e 900 06 Prel.
D0
Channel Lint (pb-1) Status
Z’ee 200 04 Prel.
Z’ 250 04 Prel.
Channel Lint (pb-1) Status
Z’ee 1288 07 Prel.
Z’ 200 04 Prel.
Z’ 195 04 Prel.
Detailed
S. Muanza Moriond QCD 2007 20 March 2007
Search for W’
• D0: • Analysis: W’e
• Triggers: single e• Data sample: 900 pb-1
• Instr. background: QCD from data• Event selection:
• at least 1 central, hard and isolated ew/ track match (but no E/p)• large mET significance
• Uncert.: norm., corr., PDF, EM scale, QCD scaling,…
• Results: • shape of mT tail above 150 GeV• Nobs= 630• Nexp(B)=622.93+/-17.91+82.65
-72.25
• Nexp(S)=16.64+/-0.39+6.86-6.06
(mW’= 900 GeV)mW’>965 GeV
S. Muanza Moriond QCD 2007 20 March 2007
Search for Z’
• CDF: • Analysis: Z’ee (G2• Triggers: di-EM• Data sample: 1288 pb-1
• MC:• Signal (Pythia):
• E6 (S=1) • and separately RS (S=2)
• Physics BKGD (Pythia)• Main BKGD:*/Zee
• Event selection: • 2 hard & isolated e (CC-CC or CC-EC)• track match for CC e
• Uncert.: lumi, PDF, ISR, (e ID),…
• Results: Mee tail above 150 GeV
S. Muanza Moriond QCD 2007 20 March 2007
Comb ee+
m(Z’)>923 GeV SM-like
m(G)>807 GeV (0.1)m(G)>889 GeV (0.1)
S. Muanza Moriond QCD 2007 20 March 2007
IV. EXTENDED NUMBEROF SPACE DIMENSIONS
2. Search for Randall-Sundrum Gravitons
1. Search for Large Extra-Dimensions
SM
Extra-D
ADD• 2 to 7 large (sub mm) EDs• gravity propagates freely in the bulk• KK excitations cannot be resolved• parameter: G =F/MS
4 (GRW: F=1)
RS • one 5th (infinite) ED with warped geometry• gravity is localized on a brane other than the SM brane• KK excitations have spacings of order TeV• parameters:
• M1: mass of the 1st KK excitation• 0.01 < )1/2/MPl < 0.1
GKK
gq
q GKK
gg
g
V
V
GKKGKK
f
ff
f
monojets
2int
*)(cos
2
GKKfGfSMfdMd
d
S. Muanza Moriond QCD 2007 20 March 2007
IV. EXTENDED NUMBEROF SPACE DIMENSIONS
1. Search for Large Extra-Dimensions
Channel Lint (pb-1) Date
qqbarG+g 85 04 Prel.
Gee/ 200 04 Prel.
Channel Lint (pb-1) Date
qqbarG+g 1100 06 Prel.
2. Search for Randall-Sundrum Gravitons
Channel Lint (pb-1) Date
Gee (see Z’) 1288 07 Prel.
G(see Z’) 200 04 Prel.
G 1200 06 Prel.
CDFD0
Channel Lint (pb-1) Date
Gee/ 1000 06 Prel.
Detailed
S. Muanza Moriond QCD 2007 20 March 2007
Search for LED
• CDF: • Analysis: qqbar/g+g G+g, q+g G+q
• Triggers: j100• Data sample: 1100 pb-1
• Event selection: • remove events from:beam halo, cosmics • 1 very hihg pT jet: CC, track confirmed• pT(j2)<60 GeV
• Main BKGD: Z()+jets• Uncert.: PDF, ISR/FSR, JES,…
• Results: • Nobs= 779
• Nexp(B)=819+/-71
S. Muanza Moriond QCD 2007 20 March 2007
VII. CONCLUSIONS
• Many topologies have been covered
• Many analyses have been (or are being) updated to the full Run IIA dataset…
• Yet no evidence of New Physics…
Exclusion Limits
S. Muanza Moriond QCD 2007 20 March 2007
Search for LeptoQuarksSummary
D0 CDF
Channel Lint (pb-1) Limits (GeV)
VLQ3 pairs2+2b 322 317294 (=1) Y-M couplings
251223 (=1) Min. couplings
LQ1 pairs : comb. ~200
/channel
236 (=1)
205 (=0.5)
126 (=0)
LQ2 pairs : comb. ~200
/channel
226 (=1)
208 (=0.5)
125 (=0)
Channel Lint (pb-1) Limits (GeV)
LQ2 pairs ++2q 1050 214 (=0.5)
LQ3 pairs 2+2b 310 219 (=0)
LQ2 pairs 2+2q
LQ2+ 2+q
300 274 (=1)
226 (=0.5)
(=1)
LQ pairs 2+2q 370 136 (=0)
LQ2 pairs 2+2q 290 251 (=1)
204 (=0.5)
LQ1 pairs 2e+2q
LQ1 pairs e++2q
252 241, 256 (=1)
218, 234 (=0.5)
Comb
.
Comb. w/ Run IRun II Alone
Th. Uncert. signal
S. Muanza Moriond QCD 2007 20 March 2007
Search for Leptons & Quarks Compositeness Summary
D0
Channel Lint (pb-1) Limits (GeV)
q*q+Z(ee) 370 510
*+ 380 618
=1 TeV
qqbarC 400 >4.2 TeV ()
>9.8 TeV ()
qqbaree (CI) 271 >3.6 TeV ()
>9.1 TeV ()
QCD Incl. Jet 800 No excess
Channel Lint (pb-1) Limits (GeV)
*+ 371 ~800
=1 TeV
QCD Incl. Jet 1040 No excess
CDF
Search for W’Summary
Channel Lint (pb-1) Limit (GeV)
W’e 205 788
Channel Lint (pb-1) Limit (GeV)
W’e 900 965
S. Muanza Moriond QCD 2007 20 March 2007
Search for Z’Summary CDFD0
Channel Lint (pb-1) Limit (GeV)
Z’ee 200 780 (SM-like)
Z’ 250 680 (SM-like)
Channel Lint (pb-1) Limit (GeV)
Z’ee 1288 923 (SM-like)
Z’ee/Comb.
200 815 (SM-like)
Z’ 195 400 (SM-like)
Channel Lint (pb-1) M1 Limit (GeV)
Gee/
1000 865 (0.1)
240 (0.01)
k()1/2/MPl
Channel Lint (pb-1) M1 Limit (GeV)
Gee/Comb.
~1288 889 (0.1)
267 (0.01)
Gee/Comb.
200 700 (0.1)
200 (0.01)
E6 Z’
R-S
S. Muanza Moriond QCD 2007 20 March 2007
Search for Z’Summary CDFD0
Channel Lint (pb-1) MS Limit (TeV)
Gee/ 200 1.36 (Run IIA)
1.43 (Run I+IIA)
N=2
qqbar G+g 85 0.68 (N=4)
0.67 (N=5)
0.66 (N=6)
0.68 (N=7)
GRW Conventions
LED
Channel Lint (pb-1) MS Limit (TeV)
R (mm)
<
qqbar G+g 1000 1.33 (N=2)
1.09 (N=3)
0.99 (N=4)
0.92 (N=5)
0.88 (N=6)
0.27
3.1x10-6
9.9x10-9
3.2x10-10
3.1x10-11
S. Muanza Moriond QCD 2007 20 March 2007
VI. PROSPECTSFOR THE RUN II B
Z’
LEDCDF
D0
As of sept. 05 (P5)
1, fbLdt
Run II B… or LHC?
S. Muanza Moriond QCD 2007 20 March 2007
Run(TeV) (fb-1)
I1992-1996
1.8 0.1
II A2001-2006
1.96 1.0
II B2006-2009
1.96 3.0-7.0
s Ldt
s5.3
Xt
ns396
ns396
The TEVATRON
This talk
Now
S. Muanza Moriond QCD 2007 20 March 2007
New @ Run IIa (tracking in B-field)
Silicon detectorFiber tracker, preshowers
Upgraded @ Run IIa Muon system, CAL
Electronics DAQ, (track) trigger
system Displaced-vtx trigger
p
Electronics
Tracker Solenoid Magnet
3 LayerMuon System
Preshowers
p
The D0 Detector
S. Muanza Moriond QCD 2007 20 March 2007
The CDF Detector
Addition or Improvments for the Run IIA• Si tracker• Central drift chamber• TOF• Secondary vertex trigger
Addition or Improvments for the Run IIA
• Forward calorimeters: "plugs" (1<||<3)
• Extended coverage
S. Muanza Moriond QCD 2007 20 March 2007
Run II A
<DAQ> ~ 80-85%
This talk:200-1300 pb-1
The TEVATRON Performances
I. INTRODUCTION
S. Muanza Moriond QCD 2007 20 March 2007
Searches for SLQ1/2 pairs
•D0: • Analysis: LQ pairs 2+2q
• Triggers: jets+mET
• Data sample: 310 pb-1
• Instr. background: QCD estimated from data • Event selection:
• at least 2 hard and acoplanar jets• no flavor tagging• large mET & HT
• Uncert.: Syst(B) ~ Stat(B) (JES),…
• Results: • Nobs=86
• Nexp(B)=75.2+14.6-15.5
• Nexp(S)=51.8+5.9-4.9
(mLQ =140 GeV)mLQ>136 GeV (95% CL)
S. Muanza Moriond QCD 2007 20 March 2007
Searches for SLQ1/2 pairs
• CDF Combination: • Analyses:
• 3 topologies 2l+jets, l+jets+mET, jets+mET
• for both LQ1 and LQ2 pair production• Bayesian combined likelihood
• Data samples: each ~200 pb-1
• Results: LQ1
LQ2
Channel Nobs Nexp(B) Main BKGD
2e+2q 4 6.24+/-2.16 ttbar
Z+jets
e+2q 4 5.4+/-1.2 ttbar
2+2q 2 2.87+/-1.0 Z+jets
+2q 3 3.74+/-0.62 ttbar
+2q 124 118.5+/-14.5 Z+jets
mLQ =160 GeV
mLQ =160 GeV
S. Muanza Moriond QCD 2007 20 March 2007
Searches for SLQ3 pairs
• D0: • Analysis: SLQ3 pairs 2+2b
• Data sample: 310 pb-1
• Triggers: jets+mET & +jets• Instr. background: QCD from data• Event selection:
• at least 2 hard acoplanar jets• large mET & HT
• reject isolated EM-clusters & isolated • 2 jets b-tagged
• Uncert.: BKGD , (b-tag), JES,…
• Results:
Nobs=1
Nexp(B)=3.47+/-0.24
Nexp(S)=8.8+/-0.2, =10.6% (mLQ =200 GeV)
QCD
Presel. mET
Final mET
mLQ3>213 GeV
S. Muanza Moriond QCD 2007 20 March 2007
Search for Excited • CDF:
• Analysis: qqbar *
• Data sample: 371 pb-1
• Triggers: incl. • Event selection:
• 2 hard & isolated • +1 hard & isolated
• Uncert.: and ID, PDF, trigger ,…
• Results:
• Hyp: CI BR(*) same as in GM • m(*)>853 GeV for =m(*in CI• m(*)>237 GeV for =m(*) in GM
• Comparison wrt D0:• Hyp: BR(includesCI• CDF: m*696 GeV for m* • D0: m(*)>688 GeV for =m(*)
m
S. Muanza Moriond QCD 2007 20 March 2007
Search for W’• CDF:
• Analysis: W’e
• Triggers: incl. e• Data sample: 205 pb-1
• Instr. background: QCD from data• Event selection:
• 1 hard & isolated e• large mET
• cut on pT(e)/mET
• Uncert.: PDF, e E-scale & resolution, ISR,…
• Results:• shape of mT tail above 200 GeV
S. Muanza Moriond QCD 2007 20 March 2007
Search for LED
Very nice CDF monojet candidatepT (j)=384 GeV & mET =390 GeVRun 155313, Event 273486
S. Muanza Moriond QCD 2007 20 March 2007
Large ED Searches at Colliders
4107.9
36.3
248.0
1102.1
1
12
12
nm
nnm
nmm
nm
R
TeVM D
Eöt-Wash Experiment Test Newton’s Law downto
Ref: Adelberger et al, PRL 86 (2001))200( mO
ED Nbers and Radii
nSS
Pln MM
MR
1)(
8
1 2