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XLII Rencontres de Moriond QCD and High Energy Hadronic Interactions March 2007 Experimental Summary Gigi Rolandi CERN PH [email protected]. Logged 710 fb-1. Logged 410 fb-1. Colliders&Colliders. HERA. TEVATRON. BES@BEPC. CLEO@CESR. KLOE@DAPHNE. RHIC. SPS. BABAR@PEP-II. - PowerPoint PPT Presentation
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XLII Rencontres de MoriondQCD and High Energy Hadronic Interactions
March 2007
Experimental Summary
Gigi RolandiCERN PH
Moriond QCD 2007Experimental Summary
2Gigi Rolandi / CERN PH
Colliders&Colliders
Logged 710 fb-1
Logged 410 fb-1
TEVATRON
BABAR@PEP-IIBELLE@KEKb
HERA
CLEO@CESR
BES@BEPC
KLOE@DAPHNE
RHIC
SPS
Moriond QCD 2007Experimental Summary
3Gigi Rolandi / CERN PH
Many many beautiful talks !
Moriond QCD 2007Experimental Summary
4Gigi Rolandi / CERN PH
• …… Impossible to make a “summary” ( less than 1 min/talk !)
• Choice of the topics based on my ignorance and my taste
•Personal bias
•Electroweak
•Higgs and single top
•Unitarity triangle
•D0-D0bar Mixing
•Extras
•No names will be mentioned …. Only Collaborations
Moriond QCD 2007Experimental Summary
5Gigi Rolandi / CERN PH
Angular Correlation of charm pairs
B0 7000 Signal events S/B 8.3 at the peak
BsK+-
CDF SVT Trigger
Bs Direct CP Asymmetry
Moriond QCD 2007Experimental Summary
6Gigi Rolandi / CERN PH
CLEO
M(D0) reduced 0.2*PDG
Q=340MeV
Measure yelds of double tag and single tag events . BRs extracted in a global 2 fit.
26 M (2s)
c0 --> KK
Moriond QCD 2007Experimental Summary
7Gigi Rolandi / CERN PH
Diffraction and pQDC@NLO
Large gluon content
Diffractive PDFs are not universal Factorization broken at Tevatron
x=xip*
Moriond QCD 2007Experimental Summary
8Gigi Rolandi / CERN PH
DIS is well described by pQCD@NLO
+ jet
CDF
Dijet
(ep--> D*X)
ep-->bbX
ep-->ccX
Dijet b-bbar
e(±)p scattering
Moriond QCD 2007Experimental Summary
9Gigi Rolandi / CERN PH
Gluon content of the proton
Are the PDFs usable in the LHC kinematic range (1 > x > 10-6) ?
Higher-order terms are important at low Q2, low x
Will LHC see saturation at very forward rapidities : x ~ 10-6 ?
Moriond QCD 2007Experimental Summary
10Gigi Rolandi / CERN PH
Heavy Ions @ RHICPseudo Rapidity dependence
Elli
ptic
flo
w
STAR, Phys Rev Lett 91, 072304
Jet quenching in Central Collisions
Moriond QCD 2007Experimental Summary
11Gigi Rolandi / CERN PH
Precise Measurements of W mass and Top
Which top mass are we measuring ?
Moriond QCD 2007Experimental Summary
12Gigi Rolandi / CERN PH
Electroweak Fit
• Preferred value: mH = 76 GeV at minimum
• Upper limit: mH < 144 GeV
NEW! March 2007, LEP EW WG
Moriond QCD 2007Experimental Summary
13Gigi Rolandi / CERN PH
Evolution of EW FIT
Evolution on MH from EW Fit
0
50
100
150
200
250
300
2000 2001 2002 2003 2004 2005 2006 2007 2008
Year
MH (GeV)
MH Central valueMH 95% upper limit
Evolution on MH from EW Fit
0
50
100
150
200
250
300
2000 2001 2002 2003 2004 2005 2006 2007 2008
Year
MH (GeV)
MH Central valueMH 95% upper limit
Moriond QCD 2007Experimental Summary
14Gigi Rolandi / CERN PH
Evolution of Mtop and MWEvolution of Mtop and Dmtop
0.00%0.50%1.00%1.50%2.00%2.50%3.00%3.50%4.00%4.50%
2000 2002 2004 2006 2008Year
Mtop/170.9-1
DMtop/Mtop
Evolution of MW and DMW
-0.02%-0.01%0.00%0.01%0.02%0.03%0.04%0.05%0.06%0.07%0.08%
2000 2002 2004 2006 2008Year
MW/80.398 -1
DMW/80.398
Moriond QCD 2007Experimental Summary
15Gigi Rolandi / CERN PH
Mw-Mtop and MSSM
George Weiglein
Moriond QCD 2007Experimental Summary
16Gigi Rolandi / CERN PH
SM Higgs Production X-section TeV/LHC
SM Higgs Production at LHC
Te
vatr
on
Moriond QCD 2007Experimental Summary
17Gigi Rolandi / CERN PH
Channels in Higgs Search
Very small rate : concentrate on channels with high Higgs Br
TevatronATLAS CMS
Large Rate: signals with smaller BR
Atlas : qqH--> qqWW, qq
Atlas: H-->ZZ,WW,
CMS: H--> , ZZ, WW
CMS: qqH--> qq,qq
Significance 30 fb-1
Moriond QCD 2007Experimental Summary
18Gigi Rolandi / CERN PH
Number of Events in 1 fb-1
Produced Selected BackgroundZH-->llbb 5 1 100ZH--> ννbb 15 2 300
-->WH l νbb 30 3 500--> -->H WW ll νν 20 4 300
Tevatron
LHC
Produced Selected BackgroundH(135)--> 86 30 300 CMS
(140)--> *-->H ZZ llll 13 3 500 CMS
(160)--> -->H WW llnn 2300 45 30 CMS
(160)--> -->qqH qqWW qqllnn 280 4 1 ATLASCMS
Moriond QCD 2007Experimental Summary
19Gigi Rolandi / CERN PH
SM Higgs at the Tevatron
not included in the plot
How To Extrapolate to 8 fb-1 ? Watch at the excess
Moriond QCD 2007Experimental Summary
20Gigi Rolandi / CERN PH
First Evidence of Single Top
D0Bayesian NN Matrix Element Decision Trees
Exp. Obs. Exp. Obs. Exp. Obs.
(tb+tqb)[pb] 3.2 +2.0-1.8 5.0 ± 1.9 3.0 +1.8
-1.5 4.6 +1.8-1.5 2.7 +1.6
-1.4 4.9 ± 1.4
Significanc 1.3 2.4 1.8 2.9 2.1 3.4
CDFMatrix Element Neural Network Likelihood ratio
2.3 excess No evidence. No evidence.
(tb+tqb)[pb] 2.7 +1.5 -1.3 < 2.6 < 2.7
….seen by D0. CDF has no evidence.
Situation pretty complex but not unusual for first evidence.
(D0) = 1.5+/- 0.4 (SM) also this not unusual
Preliminary
Moriond QCD 2007Experimental Summary
21Gigi Rolandi / CERN PH
Single Top and Higgs Search
D0 Single Top
CDF ZZ--> llνν
In 1 fb-1
Produced Selected Backgroundt--> Wb-->l ν b 650 36 600
--> ( +ZZ ll ll νν) 20 9 23
Produced Selected BackgroundZH-->llbb 5 1 100ZH--> ννbb 15 2 300
-->WH l νbb 30 3 500--> -->H WW ll νν 20 4 300
Moriond QCD 2007Experimental Summary
22Gigi Rolandi / CERN PH
Higgs in MSSM
Amplitude is ~tan, hence the cross section is enhanced as tan2CDF search in h-->ejet D0 see a deficit in the same mass region
CDF search in double leptonic channel not conclusive
Moriond QCD 2007Experimental Summary
23Gigi Rolandi / CERN PH
Exclusive di-jet x-section at Tevatron
Calibrate scale of predictions
Relevant for pp-->ppH
Moriond QCD 2007Experimental Summary
24Gigi Rolandi / CERN PH
Diffractive Higgs @ LHC
The diffractive production of the Higgs pp-->pHp opens the possibility to measure its quantum numbers and its mass with high precision exploiting the measurement of the outgoing protons momenta in the roman pots.
100 fb-1
• X-sections O(1fb) --> Large Luminosities
• Pile up in coincidence with di-jet production is an overwhelming source of background
•To resolve different interactions in the same bunch crossing one needs a time coincidence between the two protons at the level of 3mm i.e. 10 ps
Moriond QCD 2007Experimental Summary
25Gigi Rolandi / CERN PH
B
+other charmonium
radiative decays Xs,Xd, Xsll
B DK
+from Penguins
Charm Physics(Dalitz)
?
theo. clean
HF Physics:Unitarity Triangle
Moriond QCD 2007Experimental Summary
26Gigi Rolandi / CERN PH
New Measurements of sin2
d d
sb
W
B0d
t s
s
K0
g
sb b s
~
~ ~
New Physics contribution (2-3 families)
( )LRd
23δ
b
d
c
csd
J/
K0
B0d
Moriond QCD 2007Experimental Summary
27Gigi Rolandi / CERN PH
Precise Measurement of ms
After LEP and D0…..
With Neural Net Selection and same side tagging
md --> 1% - ms --> 0.7% - 68
Moriond QCD 2007Experimental Summary
28Gigi Rolandi / CERN PH
Progress on Vub
Inclusive : stability in extrapolation to full phase space
B Xu l ν B l ν
Exclusive :measurement of form factors
Moriond QCD 2007Experimental Summary
29Gigi Rolandi / CERN PH
IS THIS CONSISTENT ?
sin2 =0.76± 0.04from indirect determination
(all included but sin2)
sin2 =0.76± 0.04from indirect determination
(all included but sin2)
sin2=0.68±0.03From direct measurement
b--> ccs
sin2=0.68±0.03From direct measurement
b--> ccs
sin2=0.53±0.05From direct measurement
Naïve averageb--> qqs
sin2=0.53±0.05From direct measurement
Naïve averageb--> qqs
ms
Moriond QCD 2007Experimental Summary
30Gigi Rolandi / CERN PH
IS THIS CONSISTENT ?
sin2 =0.76± 0.04from indirect determination
(all included but sin2)
sin2 =0.76± 0.04from indirect determination
(all included but sin2)
sin2=0.68±0.03From direct measurement
b--> ccs
sin2=0.68±0.03From direct measurement
b--> ccs
sin2=0.53±0.05From direct measurement
Naïve averageb--> qqs
sin2=0.53±0.05From direct measurement
Naïve averageb--> qqs
Robust: Dominated by Vub, SM tree level, non dependent on NP
Experimentally robust, but measures 2(SM+NP)
Naïve average of measurement affected by penguins in a different way….
Moriond QCD 2007Experimental Summary
31Gigi Rolandi / CERN PH
Mixing in D0 -D0bar system Observed
BaBar
DCS decays
Interference “Oscillations”
ΓΓ
=Γ
=2
, ym
xδδ cossin' yxy +−=
δδ sincos' yxx += Strong phase
No mixing 2=24 -
Mixing+resolution from likelihood fit 2=1.5
3.9
3' (9.7 4.4 3.1) 10y −= ± ± ×'2 3( 0.22 0.30 0.20) 10x −= − ± ± ×
Moriond QCD 2007Experimental Summary
32Gigi Rolandi / CERN PH
Evidence for D0 -D0bar Mixing
Belle
Time dependent analysis of Dalitz plot
Lifetime difference
Moriond QCD 2007Experimental Summary
33Gigi Rolandi / CERN PH
D0 -D0bar Mixing: Comparison
δδ cossin' yxy +−=
δδ sincos' yxx +=
Belle 2 statistical
BaBar 2BaBar 3
BaBar 1
(0,0)
stat. only
y’ /10-2
x’2/10-2
Ciuchini et al hep-ph/0703204
δ=-38o±46o
Moriond QCD 2007Experimental Summary
34Gigi Rolandi / CERN PH
Is Bayesian approach biasing ?
AristotelePlatone
Moriond QCD 2007Experimental Summary
35Gigi Rolandi / CERN PH
Is Bayesian approach biasing ?
Bayesian Frequentist
My cent: use frequentist approach if you can. It is correct. In many cases it is not-practical…. Then use Bayesian approach and common sense . And show the relevance of the assumptions on the Prior Probability.
hep-ph/0701204 hep-ph/0607246
Moriond QCD 2007Experimental Summary
36Gigi Rolandi / CERN PH
Conclusions
• Very large samples of data are available allowing precise measurements and studies of rare phenomena
•I have been impressed by the quality (and the complexity) of the analyses that have been presented
•The steady progress in the field is marked by discoveries of new expected phenomena that have been recently seen: DDbar mixing, Single top, ZZ
•QCD is - generally speaking - in good shape and describes well the hadron production at high and low Q2
•This accurate description requires a monumental effort both on theory and experimentation and is needed for the searches of new physics at hadron colliders and at lower energy
•Everybody is waiting for the start of LHC. It is close. At Moriond XLIV we will see the first presentations with data, but it will take time to understand the detectors
•In the mean time watch the Tevatron, the Triangle and the rest…. The devil is in the details of experiments and theory
Moriond QCD 2007Experimental Summary
37Gigi Rolandi / CERN PH
Thanks
• To Tran for the 42 Moriond that he invented for us
• To the organizers for a well organized conference
• To all the speakers for their very good talks