V. Chekelian, A. Glazov, S.Habib, A. Nikiforov, R ...zhang/paper/hiq2Final/t0110915.pdf · Zhiqing...

T0, Physics Plenary 15/09/2011 1/45 Zhiqing Zhang

V. Chekelian, A. Glazov, S.Habib, A. Nikiforov,

R. Plačakytė, V. Radescu, E. Rizvi, S. Shushkevich,

T.H.Tran, Z.Zhang

1st part given by Eram on July 18th

https://www-h1.desy.de/iminutes/thursday/2011/07.18/Rizvi.pdf


1. NC cross section reported in 1st part - few minor changes cross section hardly affected

2. Final CC cross sections

3. HERA-I+II data combination

4. Combined QCD-EW fits

5. Paper draft


- HERAPDF1.0 is used instead of H1 PDF 2010

- MC stat uncertainty is added to uncorrelated error

-  QED rad. cor. uncertainty applied differently (shift method)

Little effects on the previously reported cross sections


-  Lumi & Polarisation -  Breakthrough on PSCC samples -  All efficiencies (trigger, vtx, bkg finders) reevaluated -  Dependence on hadronisation models -  Comparison of two analyses -  Final cross sections


Polarisation [%] -60 -40 -20 0 20 40 60

] -1Lu

min

osity

[nb

0

2000

4000

6000

8000

10000p-e

Polarisation [%] -60 -40 -20 0 20 40 60

] -1Lu

min

osity

[nb

0

2000

4000

6000

8000

10000 p+e

2009 Compton based lumi. corr.  To be updated

No update on polarisation since 2007


Observations: Large discrepancy observed between PSCC data and CC MC and/or PSCC MC

Breakthrough: Bug on missing FST hits/vertex in PSCC data found by Sasha & Ringaile, fixed by Sergey

Before

After


Based on PSCC samples Evaluated period-by-period Here an example for 0607 R (after reweighting using track multiplicity distribution)

Quoted syst. Uncertainties:

3% 1.5%


Using subtriggers: 66 (Etmiss>2) 67 (Electron1) 77 (Etmiss>1)

Based on PSCC data

Applied to CC MC -either in x-Q2 bins -or parameterized in PT-γh

Difference covered mostly by quoted uncertainty: 15%(1-ε) + 0.2%


Ex. 0607 R

Quoted uncertainty: 2% (y<0.08), 1% (y>0.08)


γp: Dominant ep background

Vap/Vp: efficient cut variable

Syst. uncertainty: ± 0.02 around the nominal value

γp background normalisation checked to be within ±30% with -  Vap/Vp distribution (before cut) & -  Tagged sample in e-tagger


2 = 300 GeV2Q 2 = 300 GeV2Q 2 = 300 GeV2Q 2 = 500 GeV2Q 2 = 500 GeV2Q 2 = 500 GeV2Q 2 = 1000 GeV2Q 2 = 1000 GeV2Q 2 = 1000 GeV2Q


2 = 8000 GeV2Q 2 = 8000 GeV2Q 2 = 8000 GeV2Q 2 = 15000 GeV2Q 2 = 15000 GeV2Q 2 = 15000 GeV2Q

LH Data+0304-0607eHERAPDF10

CC

0

0.2

0.4

0.6

0.8

CC

0

0.2

0.4

0.6

0.8

CC

0

0.2

0.4

0.6

0.8x

-210 -110

x-210 -110

x-210 -110

Example with L, e+

No extra uncertainty for CDM/MEPS, covered by Vap/Vp variation


Largest syst. among the 4 data samples


x

Example for 0607 L

Shown are for - ratio of ds2/dxdQ2 [left] - comparison of ds/dQ2 [bottom]

Two analyses differ mainly in background rejection cuts with different finders/ optimisation


Method: Sasha’s combination method as used in previous publications

Data samples: - HERA-I: all published high Q2 NC, CC cross section data - HERA-II: merge L, R data samples and correct for small residual Pe

Applications: - xF3 extraction (double differential NC e+/e- cross sections) - “Universality” plot (single differential NC, CC, e+/e- cross sections)


-  Fit Strategy

-  Input data sets

-  Correlation across the data sets

-  Comparison/validation of two fitting programmes

-  Heavy flavour mass scheme, PDF para. optimisation

-  Results


Following the strategy of previous publication in 2005 (based on HERA-I data):

Fit EW parameters and PDFs simultaneously

Expect additional sensitivity from HERA-II - polarised beam - higher stat data samples


Table 4 in the paper draft


δpol

+P1

-P1

+P2

-P2

Table 5 in the paper draft


0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

QCDFIT

H1fitter(10p,old 2)

H1

68% CL

Standard Model

au

v u

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

-1 -0.8 -0.6 -0.4 -0.2 0 0.2

QCDFIT

H1fitter(10p,old 2)

H1

68% CL

Standard Model

adv d

Both use HERAPDF1.0 parametrisation and zero mass HF scheme

Very similar contours Difference contour size still to be understood


To be added or Refer to Voica’s presentation for pre-t0 talk


Table 8, to be updated with final fit results


Version 0.7 sent to referees on 6th early morning

Version 0.7 sent to referees on 6th early morning

The paper contains - 8 sections, > 30 tables, >25 figures


θtrack-θclus vs. θclus compared between Data/MC Error band: ± 1mrad

]o [clus

20 40 60 80 100 120 140

[mra

d]cl

us

tr

ack

-4

-2

0

2

4

6

8 H1 Collaboration

HER

A-II

p+H1 NC eMC

1 mrad± clusMC,

]o [clus

20 40 60 80 100 120 140

[mra

d]cl

us

tr

ack

-4

-2

0

2

4

6

8 H1 Collaboration

HER

A-II

pH1 NC eMC

1 mrad± clusMC,


PT and y balance plots vs. PT,e and γhad shown for combined e+, e- data & MC Error band: ± 1% variation

]o [had20 40 60 80 100 120 140 160 180

DA

/yha

dy

0.9

0.92

0.94

0.96

0.98

1

1.02

1.04

1.06

1.081.1

H1 Data NCNC MC

1%±NC MC

H1 Collaboration

HER

A-II

[GeV]elecTP

10 20 30 40 50 60 70 80 90 100

elec

T /

Pha

dTP

0.94

0.96

0.98

1

1.02

1.04

1.06

H1 Data NCNC MC

1%±NC MC

H1 Collaboration

HER

A-II


[GeV]zE-P30 40 50 60 70 80 90

eve

nts

310

0

10

20

30

40

50

60

[GeV]eE’0 5 10 15 20 25 30 35 40 45 50

eve

nts

310

0

5

10

15

20

25

30

35

]o [e

0 20 40 60 80 100 120 140 160

Even

ts

1

10

210

310

410

510

610 pH1 NC Data eNC MC + Bkg MCBkg MC

H1 Collaboration

HER

A-II

[GeV]zE-P30 40 50 60 70 80 90

eve

nts

310

0

10

20

30

40

50

60

70

[GeV]eE’0 5 10 15 20 25 30 35 40 45 50

eve

nts

310

0

5

10

15

20

25

30

35

40

]o [e

0 20 40 60 80 100 120 140 160

Even

ts

1

10

210

310

410

510

610 p+H1 NC Data eNC MC + Bkg MCBkg MC

H1 Collaboration

HER

A-II

MC reweighted to HERAPDF1.0


Jet based PT balance, jet angle and E-pz distributions shown for e+, e- & MC


Ee, θe, E-pz distributions shown for e+, e- & MC


MC reweighted to HERAPDF1.0

[GeV]T,hP0 10 20 30 40 50 60 70 80 90 100

Even

ts

200

400

600

800

1000

H1 Collaborationp CC Data+H1 e

MC (CC + Bkg)MC (Bkg)

MEPSMCCDMMC

[GeV]zE-P0 10 20 30 40 50 60

Even

ts

100

200

300

400

500

600

p/VapV0.00 0.05 0.10 0.15 0.20 0.25 0.30

Even

ts

-110

1

10

210

310

410

510

HER

A II

[GeV]T,hP0 10 20 30 40 50 60 70 80 90 100

#Eve

nts

200

400

600

800

1000

1200

H1 Collaborationp CC Data+H1 e

MC (CC + Bkg)MC (Bkg)

MEPSMCCDMMC

[GeV]zE-P0 10 20 30 40 50 60

#Eve

nts

100

200

300

400

500

600

700

800

900

p/VapV0.00 0.05 0.10 0.15 0.20 0.25 0.30

#Eve

nts

-110

1

10

210

310

410

510

HER

A II


]2 [GeV2Q

310 410

]2 [p

b/G

eV2

/dQ

d

-710

-610

-510

-410

-310

-210

-110

1

10

210

310

Y<0.9

H1 Collaboration

HER

A-II

p NC, P = -37.6%+H1 e

p NC, P = 32.5%+H1 e

HERAPDF 1.0, P = -37.6%

HERAPDF 1.0, P = 32.5%

]2 [GeV2Q

310 410

]2 [p

b/G

eV2

/dQ

d

-710

-610

-510

-410

-310

-210

-110

1

10

210

310

Y<0.9

H1 Collaboration

HER

A-II

p NC, P = -26.0%H1 e

p NC, P = 36.9%H1 e

HERAPDF 1.0, P = -26.0%

HERAPDF 1.0, P = 36.9%

]2 [GeV2Q310 410

(HER

APD

F 1.

0)2

/dQ

/d2/d

Qd 0.6

0.8

1

1.2

1.4

1.6

1.8

Y<0.9

H1 Collaboration

HER

A-II

p NC, P = -26.0%_ H1 e

p NC, P = 36.9%_ H1 e

HERAPDF 1.0 Uncert

310

0.90.95

11.05

1.1

]2 [GeV2Q310 410

(HER

APD

F 1.

0)2

/dQ

/d2/d

Qd 0.6

0.8

1

1.2

1.4

1.6

1.8

Y<0.9

H1 Collaboration

HER

A-II

p NC, P = -37.6%+H1 ep NC, P = 32.5%+H1 e

HERAPDF 1.0 Uncert

310

0.90.95

11.05

1.1

Lumi uncertainty unshown, no fitted normalisation shift applied


Direct evidence of parity violation in DIS NC with minimal sensitivity to PDFs

A =2

PR − PL

σ±(PR)− σ±(PL)σ±(PR) + σ±(PL)

� ∓κaeF γZ

2

F2


]2 [GeV2Q

310 410

]2 [p

b/G

eV2

/dQ

d

-610

-510

-410

-310

-210

-110

1

Y<0.9

H1 Collaboration

HER

A-II

= -37.6%ep CC, P+H1 e

= 32.5%ep CC, P+H1 e

= -37.6%eHERAPDF 1.0, P

= 32.5%eHERAPDF 1.0, P

]2 [GeV2Q

310 410

]2 [p

b/G

eV2

/dQ

d

-610

-510

-410

-310

-210

-110

1

Y<0.9

H1 Collaboration

HER

A-II

= -26.0%ep CC, P_ H1 e

= 36.9%ep CC, P_ H1 e

= -26.0%eHERAPDF 1.0, P

= 36.9%eHERAPDF 1.0, P

]2 [GeV2Q310 410

(HER

APD

F 1.

0)2

/dQ

/d2/d

Qd

0.4

0.6

0.8

1

1.2

1.4

1.6

Y<0.9

H1 Collaboration

HER

A-II

p CC, P = -37.6%+H1 e

p CC, P = 32.5%+H1 e

HERAPDF 1.0 Uncert

]2 [GeV2Q310 410

(HER

APD

F 1.

0)2

/dQ

/d2/d

Qd

0.4

0.6

0.8

1

1.2

1.4

1.6

Y<0.9

H1 Collaboration

HER

A-II

p CC, P = -26.0%_ H1 e

p CC, P = 36.9%_ H1 e

HERAPDF 1.0 Uncert

Lumi uncertainty unshown, no fitted normalisation shift applied


]2 [p

b/G

eV2

/dQ

d

-710

-510

-310

-110

10

]2 [GeV2Q310 410

p CC+H1 e

p CC-H1 e

p CC (HERAPDF 1.0)+SM e

p CC (HERAPDF 1.0)-SM e

p NC+H1 ep NC-H1 e

p NC (HERAPDF 1.0)+SM ep NC (HERAPDF 1.0)-SM e

y < 0.9 = 0eP

Beautiful demonstration of unification of electromagnetic & weak forces in DIS

Text book plot


At low Q2, γ-exchange dominant  Little polarisation effect

At high Q2, Z, γ-Z contribute  Parity violation effect visible

H1 CollaborationNC

HER

A-II

X X

p, P = -26.0%_ H1 NC e

p, P = 36.9%_ H1 NC e

p, P = -_ HERAPDF 1.0, e

p, P = 3_ HERAPDF 1.0, e

-210 -110 1

2 = 30000 GeV2Q

-210 -110 1

2 = 20000 GeV2Q

-210 -110 1

0.5

1

1.5 2 = 12000 GeV2Q

2 = 8000 GeV2Q2 = 5000 GeV2Q2 = 3000 GeV2Q

0.5

1

1.5 2 = 2000 GeV2Q

2 = 1500 GeV2Q2 = 1200 GeV2Q2 = 1000 GeV2Q

0.5

1

1.5 2 = 800 GeV2Q

2 = 650 GeV2Q2 = 500 GeV2Q2 = 400 GeV2Q

0.5

1

1.5 2 = 300 GeV2Q

2 = 250 GeV2Q2 = 200 GeV2Q2 = 150 GeV2Q

0.5

1

1.5 2 = 120 GeV2Q


H1 CollaborationNC

HER

A-II

X X

p, P = -37.6%+H1 NC e

p, P = 32.5%+H1 NC e

HERAPDF 1.0, P = -37.6%

HERAPDF 1.0, P = 32.5%

-210 -110 1

2 = 30000 GeV2Q

-210 -110 1

2 = 20000 GeV2Q

-210 -110 1

0.5

1

1.5 2 = 12000 GeV2Q

2 = 8000 GeV2Q2 = 5000 GeV2Q2 = 3000 GeV2Q

0.5

1

1.5 2 = 2000 GeV2Q

2 = 1500 GeV2Q2 = 1200 GeV2Q2 = 1000 GeV2Q

0.5

1

1.5 2 = 800 GeV2Q

2 = 650 GeV2Q2 = 500 GeV2Q2 = 400 GeV2Q

0.5

1

1.5 2 = 300 GeV2Q

2 = 250 GeV2Q2 = 200 GeV2Q2 = 150 GeV2Q

0.5

1

1.5 2 = 120 GeV2Q

At low Q2, γ-exchange dominant  Little polarisation effect

At high Q2, Z, γ-Z contribute  Parity violation effect visible


H1 CollaborationCC

HER

A-II

X X X-210 -110 -210 -110 -210 -110

1

2

2 = 300 GeV2Q 2 = 500 GeV2Q 2 = 1000 GeV2Q

0.5

1

1.5

2 = 2000 GeV2Q 2 = 3000 GeV2Q 2 = 5000 GeV2Q

0

0.5

1

2 = 8000 GeV2Q 2 = 15000 GeV2Q = -26.0%

ep, P_ H1 CC e

= 36.9%e

p, P_ H1 CC e = -26.

ep, P_ HERAPDF 1.0, e

= 36.9e

p, P_ HERAPDF 1.0, e

H1 CollaborationCC

HER

A-II

X X X-210 -110 -210 -110 -210 -110

1

2

2 = 300 GeV2Q 2 = 500 GeV2Q 2 = 1000 GeV2Q

0.5

1

1.5

2 = 2000 GeV2Q 2 = 3000 GeV2Q 2 = 5000 GeV2Q

0

0.1

0.2

0.3

0.42 = 8000 GeV2Q 2 = 15000 GeV2Q

= -37.6%ep, P+H1 CC e = 32.5%ep, P+H1 CC e

= -37.6%eP+ HERAPDF 1.0, e = 32.5%eP+ HERAPDF 1.0, e

W exchange Maximal parity violation effect Large difference in L & R CC cross sections


Little sensitivity to Pe  L & R samples combined

Future FL measurement when Ep=460, 575GeV will be ready

[GeV]2Q

210 3100.8

0.9

1

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

p+H1 NC epH1 NC e

p+HERAPDF 1.0, epHERAPDF 1.0, e

H1 Collaboration

Y<0.9 = 0eP

NC

HER

A-II


H1 CollaborationNC

HER

A-I+

II

X X

= 0ep, P_ H1 NC e

= 0e

p, P+ H1 NC e

= 0ep, P_ HERAPDF 1.0, e

= 0e

p, P+ HERAPDF 1.0, e

-210 -110 1

2 = 30000 GeV2Q

-210 -110 1

0.2

0.4

0.6

2 = 20000 GeV2Q

2 = 12000 GeV2Q2 = 8000 GeV2Q2 = 5000 GeV2Q

0.5

1

1.5 2 = 3000 GeV2Q

2 = 2000 GeV2Q2 = 1500 GeV2Q2 = 1200 GeV2Q

0.5

1

1.5 2 = 1000 GeV2Q

2 = 800 GeV2Q2 = 650 GeV2Q2 = 500 GeV2Q

0.5

1

1.5 2 = 400 GeV2Q

2 = 300 GeV2Q2 = 250 GeV2Q2 = 200 GeV2Q

0.5

1

1.5 2 = 150 GeV2Q

Improved precision

γ dominance et low Q2   σ(e+) ~ σ(e-)

γZ increases as Q2   σ(e+) ≠ σ(e-)


1 10 210 310 410 510 610-310

-210

-110

1

10

210

310

410

510

610x = 0.00005, i = 21

x = 0.00008, i = 20x = 0.00013, i = 19

x = 0.00020, i = 18x = 0.00032, i = 17

x = 0.0005, i = 16x = 0.0008, i = 15

x = 0.0013, i = 14x = 0.0020, i = 13

x = 0.0032, i = 12x = 0.005, i = 11

x = 0.008, i = 10x = 0.013, i = 9

x = 0.02, i = 8x = 0.032, i = 7

x = 0.05, i = 6

x = 0.08, i = 5

x = 0.13, i = 4x = 0.18, i = 3x = 0.25, i = 2

x = 0.40, i = 1

x = 0.65, i = 0

p+ H1 NC ep_ H1 NC e2H1 Low Q

Fixed TargetH1PDF 2009

p+ HERAPDF 1.0, ep_ HERAPDF 1.0, e

HER

A I +

II

H1 Collaboration

]2 [GeV2Q

i) x

22

(x,Q

NC

±

Scaling variation vs. Q2 Shown for fixed x shown





H1 CC eHERAPDF 1.0x(u+c)

0

1

2

3

0

0.5

1

1.5

0

0.5

1

X-210 -110

X-210 -110

X-210 -110

H1 Collaboration

HERA

I +

II

cc



2 = 8000 GeV2Q 2 = 8000 GeV2Q 2 = 8000 GeV2Q 2 = 15000 GeV2Q 2 = 15000 GeV2Q 2 = 15000 GeV2Q+H1 CC e

HERAPDF 1.0x(d+s)2(1-y)

0

0.5

1

1.5

2

0

0.2

0.4

0.6

0.8

0

0.1

0.2

0.3 X-210 -110

X-210 -110

X-210 -110

H1 Collaboration

HERA

I +

II

cc

CC cross sections fluctuation much reduced with combined HERA-I+II data Unique data sets to separate d/u quark flavours


To be updated with combined HERA-I+II data


[%]eP-100 -50 0 50 100

[pb]

CC

tot

0

20

40

60

80

100

120XpeH1 HERA-IH1 HERA-II

Xp+eH1 HERA-IH1 HERA-II

HERAPDF 1.0

Linear Fit

H1 Collaboration

Y<0.92>400 GeV2Q

Linear fit results:

e-p data: σ(Pe=+1)=-0.94 ± 2.44 ± 1.67 ± 2.65 (pb) (exp) (lumi) (pol) e+p data: σ(Pe=-1)=-1.44 ± 1.33 ± 0.68 ± 0.85 (pb)

95%CL Feldman-Cousins limits on right handed current: σ(Pe=+1) < 7.0 pb (e-p) σ(Pe=-1) < 2.1 pb (e+p)

95%CL lower mass limits on MWR assuming SM couplings & light right handed neutrinos:

MWR>194 GeV (e-p) 208 GeV (e+p)


To be added when the fit is finalized


Precision competitive with D0 & LEPWW To be updated with final results from H1fitter

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

vu-au-vd-ad-PDF

vu-au-PDF

H1

68% CL

Standard Model

LEP EWWG

D0 (4-D)D0 (2-D)

au

v u

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

-1 -0.8 -0.6 -0.4 -0.2 0 0.2

vu-au-vd-ad-PDF

vd-ad-PDF

H1

68% CL

Standard Model

LEP EWWGD0 (4-D)D0 (2-D)

ad

v d


- NC & CC cross sections now final

-  HERA-I+II combination performed

-  Combined QCD-EW fit being finalised

V. Chekelian, A. Glazov, S.Habib, A. Nikiforov, R ...zhang/paper/hiq2Final/t0110915.pdf · Zhiqing...

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