H1: status and prospectssschmitt/talks/prc_oct_2003.pdf · PRC meeting, October 30, 2003 Stefan Schmitt, University of Zürich Data taking, background conditions INTEGRATED LUMINOSITY

Stefan Schmitt, University of ZürichPRC meeting, October 30, 2003

H1: status and prospects

� H1 detector status

� Recent H1 physics results

� Summary and conclusions


H1 detector status

Detector performance after the 2003 shutdown� Data taking, background conditions� First Data

Status of repaired/new components� CIP (Central Inner Prop. Chamber)� VFPS (Very Forward Proton Spectrometer)� FTT (Fast Track Trigger)


H1 high Q2 events

Charged current with 2 jets

Neutral current

First HERA data at high Q2 with polarized positron beam

ZR

Q2=6000 GeV2PT=50 GeV

ZR

PT(e)=95 GeVQ2=14000 GeV2


Data taking, background conditionsINTEGRATED LUMINOSITY (12.10.03−25.10.03)

Produced byHERA Drift Chamber

Central

On

0

50

100

150

0 5 10 15 20 25 30 35 40

ep fill 24.10.2003. Ip = 58 mA.Ie [mA]

CJC

2 [µ

A]

ep fill 24.10.2003. Ip = 58 mA.

10.5 mAe+ only

58 mAprotons

lostRamp up HV

trips

tolerable230x60 mA

� Data taking has started

� Background similar to Feb 2003

� Vaccum conditioning worked� Background is dominated by p-beamgas

� Present limit: 30x60 mA2

� Extrapolate CJC currents: factor 3 improved vacuum needed to run at HERA II design currents


First data

J/ψ from e+e- and µ+µ-

Entries 397

/ ndf 2χ 19.91 / 25

U_n 19.54± 297

U_exp 0.211± 0.6171

U_sqr 53.78± 0.01108 µ 0.0002477± 0.1458 σ 0.0003996± 0.001008

N(D*) 11.56± 45.58

m in GeV∆0.135 0.14 0.145 0.15 0.155 0.16 0.165 0.17

num

ber

of D

* ca

ndid

ates

0

5

10

15

20

25

Entries 397

/ ndf 2χ 19.91 / 25

U_n 19.54± 297

U_exp 0.211± 0.6171

U_sqr 53.78± 0.01108 µ 0.0002477± 0.1458 σ 0.0003996± 0.001008

N(D*) 11.56± 45.58

+ c.c.s+π+π− K→s

+π0D→+D*

D* reconstruction

electron (NC)2Q0 2000 4000 6000 8000 100001200014000

Eve

nts

10-1

1

10

102

103

104

NC high Q2 data,SM predition

LAr calorimeter

Tracking detectors

SpaCal

H1 Detector iswell prepared for HERA II data

8000

6000

2000

4000

15 25 30 45403520E [GeV]

Kinematic peak

M(l+l−) [GeV]

4

8

12

16

20

2 4 6 8Silicon detectors S/N

BST: 34CST: 20FST: 32


CIP: status after shutdownReconstruct vertex position for L1 trigger,

seperate ep collisions from background

Chamber and readout (optical links, FPGA based trigger) working well, hit efficiency close to 100%

CIP vertex trigger is used to trigger ep events and to veto non-ep events from collimators C5a, C5b

Repair was a success — CIP has become a vital part of the H1 trigger −200 −150 −100 −50 0 50 100 150 2000

20

40

60

80

100

120

140

160

CIP vetoed backgroundAll events

C5AC5B

ep events

z−vertex position seen by CJC

novertex

CIP chamber

pad readoutfive layers

Bin 4 Bin 3 Bin 2 Bin 1z−vertex histogram

Bin 0

fast track finding for L1 triggerpointing geometry enables


VFPS installationVery Forward Proton Spectrometer installed in HERA tunnel (at 220 m).Build for precise measurements of diffractive reactionsData taking started last week. Commissioning with proton beam ongoing.


Fast Track Trigger

FTT: reconstruct tracks from 12 layers of CJC wires

FTT hardware installed, readout working

Trigger programming (FPGA, DSP) ongoing

Provide Trigger information on

� L1 (2�s): coarse tracks

� L2 (20�s): vertex-fitted tracks

� L3 (100�s): invariant masses

CJC track withFTT hits in all layers


Recent H1 physics results

� �p -> �Y at high |t|

� DVCS

� Beauty in photoproduction

� NLO treatment of diffractive final states

� Event Shapes in DIS

� Squarks in R-parity violating SUSY

� Generic Search for new physics

� Search for superlight gravitino

� Search for Contact Interactions

� Diffractive J/� Production at high |t|

� Multi-electron production

� Search for Single Top

� Dijets and azimuthal decorrelations at low x

� Multi-muon production

53 papers sent to EPS 2003 — HERA I data still providing many new results

New results and publications since the last PRC


Beauty in photoproduction

B-identification based on pT

rel and lifetime information (CST).

Progress: precision, differential distributions

H1 and ZEUS in agreement. Data 1.8� above NLO.

20

40

60

-1 0 1 2

H1 Data

ZEUS Data

NLO QCD ⊗ Had

dσ/dηµ (ep → ebb−X → ejjµX)

Q2 < 1 GeV2

0.2 < y < 0.8pµ

t > 2.5 GeV

pjett > 7(6) GeV

|ηjet| < 2.5

ηµ

dσ/d

η µ[pb

]

0

2

4

4 6 8 10

H1 (Prel.)

ZEUS (Prel.)

-0.55 < ηµ < 1.1

-1.6 < ηµ < 2.3

NLO QCD ⊗ Had

ep → ebb−X → ejjµX

Beauty Production

pµt [GeV]

Dat

a/Th

eory

Q2 < 1 GeV2; 0.2 < y < 0.8

pjet1(2)t > 7(6) GeV; |ηjet| < 2.5


Diffraction and NLO QCD in DIS

Diffractive PDFs extracted from F2D assuming factorisation + NLO QCD

Does it describe diffractive dijet and charm production?

0

0.1

0.2

0.2 0.4 0.6 0.8 1

0

1

0.2 0.4 0.6 0.8 1

0

0.1

0.2

0.2 0.4 0.6 0.8 1

0

1

0.2 0.4 0.6 0.8 1

0

0.1

0.2

0.2 0.4 0.6 0.8 10

1

0.2 0.4 0.6 0.8 1

H1 2002 σrD NLO QCD Fit

z Σ(

z,Q

2 )

z g(

z,Q

2 ) Q2

[GeV2]

6.5

15

z z

90

Singlet Gluon

H1 preliminary

H1 2002 σrD NLO QCD Fit

(exp. error)(exp.+theor. error)

H1 2002 σrD LO QCD Fit

g

pp

c,jet

jetc,

γ

z

x

Q

IP

IP

2

diffractivePDF frominclusive data

NLO QCDcalculation


Diffraction and NLO QCD in DIS

10-1

1

10

20 40 60 800

0.5

1

1.5

2

2.5

100 150 200 250

1

10

10 2

-2.5 -2.25 -2 -1.75 -1.5

H1 Diffractive Dijets (prel.)

Q2 [GeV2]

dσ /

dQ2 [p

b/G

eV2 ]

H1 Data pT,1(2)>5(4) GeVDDISENT NLO *(1+δhad.)DDISENT NLODDISENT LO

H1 fit 2002, µr2=pT

2, µf2=40 GeV2

W [GeV]

dσ /

dW [p

b/G

eV]

log10xIP

dσ /

d lo

g 10x IP

[pb]

<η>jets

lab

dσ /

d<η>

jets

lab [p

b]

0

50

100

150

200

-1 -0.5 0 0.5 1 1.5

0

200

400

600

800

1000

1200

0 0.2 0.4 0.6 0.8 1zIP

dσ /

dzIP

[pb]

H1 DataDHVQDIS NLODHVQDIS LO

H1 fit 2002, µ2=Q2+4mc2

H1 Diffractive D* (prel.)

Data described by NLO QCD + diffractive PDFs

QCD factorisation worksin DIS (and �p)


Event shapes in DIS

τ0.0 0.5 1.0

τ/d

σ d

σ1/

10-4

10-3

10-2

10-1

1

10

102

103

<Q>= 15 GeV

<Q>= 18 GeV

<Q>= 24 GeV

<Q>= 37 GeV

<Q>= 58 GeV

<Q>= 81 GeV

<Q>=116 GeV

H1 preliminary

)+NLL+PC2sαNLO(

τH1 EVENT SHAPES:

Sensitive to �S and hadronisation effects �

0

Example: � = (1-thrust)

H1 analysis: fit differental distributions with

NLO + NLL + PC

pQCD

powercorrections


Event shapes in DISFit differential event-shapes to

NLO + NLL + PC

Fit result:

PC parameter �0

strong coupling constant �S

Good agreement for different event shapes.

)+NLL+PC Fits2sαNLO(

H1 preliminary

stat. and exp. syst. errors

Q >20GeV

world average

cτ

τ

B

0ρ

C

)0Z(msα0.11 0.12 0.13

=2 G

eV)

Iµ( 0α

0.40

0.45

0.50

0.55

0.60


RP violating SUSY — squark search

Coupling of em strength: exclude squark up to 275 GeV.

All e+p and e–p data at CM-energy 320 GeV included.

New: perform scan in tan(�) for mSUGRA model

Searches for squarks in RP viol. SUSY

10-2

10-1

1

100 120 140 160 180 200 220 240 260 280

10-2

10-1

1

100 120 140 160 180 200 220 240 260 280

Unconstrained MSSM, j=3

tan β = 6-300 < µ < 300 GeV70 < M2 < 350 GeV

MLSP > 30 GeV imposed

H1 preliminary

EXCLUDED

EXCLUDED IN PART OF

PARAM. SPACE

e+ + d → t

∼ (APV)

Msquark (GeV)

λ, 131

80

100

120

140

160

180

5 10 15 20 25 30 35 40 45 50

Searches for squarks in RP viol. SUSY

b∼ (λ

, 113=0.3)

d∼, s

∼ (λ, 11k=0.3, k=1,2)

u∼, c

∼ (λ, 1j1=0.3, j=1,2)

t∼ (λ, 131=0.3)

m0= m1/2= M, µ < 0, A0= 0

not a

llowe

d

H1 preliminary 95% CL

mSUGRA

tan β

M (G

eV)

80

100

120

140

160

180

5 10 15 20 25 30 35 40 45 50

Squark

RP violating

coupling �'q

e

Squark production


Generic search for new physicsReconstruct high-p

T objects (e, , ,� � �,jet)

pT>20 GeV, 10 <˚ �<140˚

Scan invariant mass and sum of transverse momenta, find “most interesting” region

Model-independent search confirms excess in �-�-jet channel studied in other analyses.

j − je − j

− jµνj − νe −

e − eµe − µ − µγj − γe − γ − νγ − γ

j − j − je − j − j

νj − j − e − e − j

νe − j − ν − j − µγj − j − γe − j − γ − νj −

e − j − j − jνj − j − j −

j − j − j − je − j − j − j −j

Events−110 1 10 210 310 410

H1 General Search

j − je − j

− jµνj − νe −

e − eµe − µ − µγj − γe − γ − νγ −

H1 Data (prelim.)

SM

γj − j − j

e − j − jνj − j −

e − e − jνe − j − ν − j − µγj − j − γe − j − γ − νj −

e − j − j − jνj − j − j −

j − j − j − je − j − j − j −j

Events

(GeV)T PΣ0 50 100 150 200 250 300

Eve

nts

10-2

10-1

1H1 Data (prelim.)SMRegion

(GeV)T PΣ0 50 100 150 200 250 300

Eve

nts

10-2

10-1

1

ν - j - µUse full HERA I luminosity: 115 pb-1 Overall goodagreement with SMin 25 search channels


Summary and Conclusions� Detector working well – first data looks good

Congratulations to HERA for the promising startup� HERA I data still is a rich source for new analyses

(e.g. QCD tests, searches for new physics)� Exciting physics program has started with HERA II:

� New detector components � High luminosity and polarisation

� Goal: exceed HERA I luminosity before next big shutdown

� Long-term goal: collect 1 fb-1 of data + low energy run


H1 CJC currents history

10-1

1

10

100 200 300 400 500 600days from 1.1.2002

CJC

2 cu

rren

t / S

ep ‘0

2 pa

ram

eter

izat

ion

10-1

1

10

IeIp < 150 mA2

IeIp < 500 mA2

IeIp > 500 mA2

IeIp > 1000 mA2

Documents

H1: status and prospectssschmitt/talks/prc_oct_2003.pdf · PRC meeting, October 30, 2003 Stefan Schmitt, University of Zürich Data taking, background conditions INTEGRATED LUMINOSITY