Upload
others
View
0
Download
0
Embed Size (px)
Citation preview
1 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
André SchöningETH Zürich
H1 Collaboration
General Analysis of HERA II Data
27.5 GeV electron – 920 GeV proton
EPS Conference, HEP 200719-25 July, Manchester, UK
HERA
2 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
HERA
City of HamburgAirport
H1ZEUS
“Hadron-Electron Ring Anlage”
protons: 920 (820) GeVelectrons/positrons: 27.5 GeV
→ cms = 318 (300) GeV
3 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
HERA I+II Running
HERA I: 1994-2000● e+p data ~ 100 pb-1
● e- p data ~ 15 pb-1
HERA II: 2003-2007● more than three times more lumi than at HERA I● large e-p data sample● longitudinally polarised leptons
new Preliminary analysis:expectedexpected
e+p data~ 60 pb-1
e- p data ~ 160 pb-1
e+p data ~ 120 pb-1
HERA II: 2003-2007● e+p data ~ 178 pb-1
● e- p data ~ 159 pb-1
previous published analysis (PLB602,p14 2004):
4 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
HERA Kinematics + SM Processes
● Dominant processes at high pT:
NC DIS: ep → eX CC DIS: ep → νX photoproduction: γp → jj
e
p X
e e
p p
e
X
ν e
γ
X
j
jQ2 Q2
Q2
γ,Z W
ej - topology eν - topology jj - topology
5 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
General Search HERA I
● study of ALL high p T final states
in a single coherent analysis
● model independent: → search for deviations from the SM
objects: e, μ, γ, jet ,ν
pT > 20 GeV
10º < Θ < 140º→ define classes
● investigate differential distributions
H1 Collab., Phys Lett B602 (2004)14
● peform a global statistical inter- pretation → check SM consistency
6 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
General Search HERA IH1 Collab., Phys Lett B602 (2004)14
in general: good agreement with the SM!
7 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
General Search HERA IH1 Collab., Phys Lett B602 (2004)14
pTmiss
latest HERA results → talk by D. South
( )
8 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
New HERA II Results: e- p
very good agreement with the SM expectation !
9 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
New HERA II Results: e+ p
again: very good agreement with the SM expectation !
10 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Statistical Interpretation of General Search
11 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Statistical Interpretation of General Search
12 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Statistical Interpretation of General Search
calculate from excess/deficit:
pregion
determine from MC experiments
probablility P for finding:
p < pregion
^
-log10
P=1.7^
pregion
~ 0.0025
13 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Statistical Interpretation of General Search
14 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Systematic Uncertainties
15 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Class Probabilities HERA II
μjν class(HERA I: 2.9)
e-p
e+p μjν class(HERA I: 2.1)
eee class ejj class
16 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Anomalous Top Prod. SensitivityH1 Collab., Phys Lett B602 (2004)14
decay: t → W b → jjb, lνbFCNC: eu → et
17 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Summary
general analysis of all classes containing at least two objects with p
T>20 GeV:
electronphotonjet muonneutrinos (missing momentum)
model-independent search for deviations from the SM
new 2003-2007 HERA II data investigated (completing previous HERA I analysis)
total event yields and differential distributions studied
very good agreement with the SM found for both e+p / e-p
18 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
HERA Last Fill (30.06.2007)
19 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Backup
20 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Distributions e+p Mall
21 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Distributions e-p Σ PT
22 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Isolated Lepton Events
● Topology:
pT
X
pT
ν
pT
l
● SM Process:W-production (p
T
X small)
ep → eX W↳ l ν
● BSM Process:➔ anomalous single top production➔ RPV SUSY: stop
predict high pT
X !
H1 Collab., Phys. Lett. B561 (2003) 241; ZEUS Collab. Phys. Lett. B559 (2003) 153
μ
jet jet
latest HERA results → talk by D. South
23 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
Class Probabilities HERA I H1 Collab., Phys Lett B602 (2004)14
24 André Schöning, ETH Zurich EPS2007, BSM Session, 19-25 July 2007, Manchester, UK
General Search HERA IH1 Collab., Phys Lett B602 (2004)14
● total invariant mass Mall = 262 GeV
● SM exp. from higher order QCD is
~ 0.02 events
● Other (rare SM/BSM) explanations:➔ (anomalous) top quark production
➔ WW production, Higgs ?