on behalf of the d0 collaboration
DESCRIPTION
Photon + jets events at Tevatron. N.Skachkov (JINR, Dubna). On behalf of the D0 Collaboration. (all quark/anti-quark subprocesses). Direct Photon Production. direct photons emerge unaltered from the hard subprocess direct probe of the hard scattering dynamics - PowerPoint PPT PresentationTRANSCRIPT
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On behalf of the D0 Collaboration
N.Skachkov (JINR, Dubna)
Photon + jets events at Tevatron
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2
(all quark/anti-quarksubprocesses)
direct photons emerge unaltered from the hard subprocess direct probe of the hard scattering dynamics
sensitivity to PDFs (gluon!)
also fragmentation contributions:
suppress by isolation criterion observable: isolated photons
Direct Photon Production
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In D0 2006 publication on the prompt photons production the deviations from the corresponding pQCD predictions, previously founded in RunI data, are observed in a more wide kinematical region and with higher statistics. This result was confirmed by CDF measurement in 2009 (DIS09, Madrid).
D0 (2006) ratio data / QCD_NLO CDF (2009) ratio data / QCD_NLO
Phys. Lett. B 639, 151 (2006)
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Inclusive isolated photon production
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pT (GeV)
6
L = 1 fbL = 1 fb-1-1
measure more differential:• tag photon and jet
reconstruct full event kinematics
• measure in 4 regions of y/yjet
- photon: central - jet: central / forward - same side / opposite side
• different PDF sensitivity in different y/yjet regions
Phys. Rev. Lett. 102, 192002 (2009) Phys. Rev. Lett. 102, 192002 (2009)
Inclusive Isolated Photon + Jet
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Difference between data and QCD predictions for cross sections (left) and their ratios (right) in 4 different rapidity (y) regions
Inclusive Isolated Photon + Jet
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Difference between data and QCD predictions for cross sections (left) and their ratios (right) in 4 different rapidity (y) regions
Inclusive Isolated Photon + Jet
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. Double Parton Scattering
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. Double Parton Scattering
as the background for Higgs
Signal DP background
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In the first 3 experiments [AFS, UA2, CDF(1993)] the events with 4 jets in the final state were considered. In the CDF(1997) “γ” = γ/π⁰ , and 5 ≤ pT^jet ≤ 7 GeV (misprint in the Table)
In the first 3 experiments [AFS, UA2, CDF(1993)] the events with 4 jets in the final state were considered. In the CDF(1997) “γ” = γ/π⁰ , and 5 ≤ pT^jet ≤ 7 GeV (misprint in the Table)
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[11] D0 Collab., V.M. Abazov et al., “Azimuthal decorrelations and multiple parton interactions in photon + 2jet and photon + 3jet events in the p-bar{p} collisions at sqrt(s) = 1.96 GeV” . Phys.Rev. D, 83 052008 (2011); arXiv : 1101.1509 [hep-ex] (2011).
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For new application of DP see:
E.L. Berger, C.B. Jackson and G. Shaughnessy, Phys. Rev. D81 (2010) 014014, arXiv: 0911.5348 [ hep-ph ]
J.R. Gaunt and W.J. Stirling, JHEP 1003:005 (2010) , arXiv:0910.4347;
D.Bandurin, G.Golovanov, N.S., arXiv:1011.2186 [ hep-ph ] JHEP Published (April 2011).
[33] I.M. Dremin and V.A. Nechitailo, “Independent pair parton interactions model of hadron interactions.” Phys.Rev. D 70 (2004) 034005; arXiv : hep-ph/ 0402286 ;
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1. Substitution of one jet by one γ/π⁰ gives one order of magnitude improvement in the ratio of DP/SP.2. New technique for extracting σ_{eff} is independent of
theoretical input and its uncertainties. It is named as “two-data-set” technique.
3. To differentiate between the DP and SP processes in data six distinguishing variables are introduced.
4. CDF(97): σ_{eff} =14.5±1.7+1.7/-2.3; f_DP=(52.6 ±2.5)%
We use the CDF (1997) methods
Classical CDF Phys.Rev.D56(1997)3811 asa new approach for DP measurements
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Double parton cross sections, CDF Phys.Rev.D56, 3811 (1997)
N_2coll –number of beam crossings with 2 hard collisions
N_2coll –number of beam crossings with 2 hard collisions
N_1coll –number of beam crossings with 1 hard collision N_1coll –number of beam crossings with 1 hard collision
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Phys. Rev. D, 81, 052012 (2010)
Phys. Rev. D, 81, 052012 (2010)
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D0 used photons with calibrated energy D0 used photons with calibrated energy
Phys. Rev. D, 81, 052012 (2010)
Phys. Rev. D, 81, 052012 (2010)
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Double parton cross sections, D0
4. In the CDF(1997) jets were not corrected for energy losses; D0 used jets with calibrated energy . (JES calibration is important at high PT)
4. In the CDF(1997) jets were not corrected for energy losses; D0 used jets with calibrated energy . (JES calibration is important at high PT)
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photon+3jets & photon+2jets
3 observable configurations yielding a “photon + 3jets” event 3 observable configurations yielding a “photon + 3jets” event
I. γ +1jet system over- laid with dijet system
I. γ +1jet system over- laid with dijet system
II. γ +2jet system (1j=gl) overlaid with 1jet from dijet system (1 lost)
II. γ +2jet system (1j=gl) overlaid with 1jet from dijet system (1 lost)
III. jet from dijet sys- tem substitute 1st jet
III. jet from dijet sys- tem substitute 1st jet
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Calculated for the pair that gives the minimum value of S:
Double parton events selection, D0
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In SP events two radiated (gluons) jets emitted closer to the leading jet (recoiling against the photon directed in φ )
In SP events two radiated (gluons) jets emitted closer to the leading jet (recoiling against the photon directed in φ )
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Double parton cross sections, D0
Phys. Rev. D 81, 052012 (2010) Phys. Rev. D 81, 052012 (2010)
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Conclusion: D0 measured )
1. The fraction of DP f_DP
2. The scale parameter σ_{eff}
in 3 PT (2-nd jet) intervals: 15< pT <20 GeV, 20< pT <25 GeV, 25< pT <30 GeV
Conclusion: D0 measured )
1. The fraction of DP f_DP
2. The scale parameter σ_{eff}
in 3 PT (2-nd jet) intervals: 15< pT <20 GeV, 20< pT <25 GeV, 25< pT <30 GeV
Phys. Rev. D 81, 052012 (2010) Phys. Rev. D 81, 052012 (2010)
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Differential Cross sections of photon+3(2) jets events
Phys.Rev. D, 83 052008 (2011); arXiv : 1101.1509 [hep-ex] (2011). Phys.Rev. D, 83 052008 (2011); arXiv : 1101.1509 [hep-ex] (2011).
The ΔS & Δφ cross section and then the DP fraction in the “γ + 3(2) jet” events are measured in 3 bins : 15< pT_j2 <20, 20< pT_j2 <25 and 25< pT_j2 < 30 GeV . The ΔЅ cross section is measured in the “γ + 3 jet” events in a single interval 15 –30 GeV.
The ΔS & Δφ cross section and then the DP fraction in the “γ + 3(2) jet” events are measured in 3 bins : 15< pT_j2 <20, 20< pT_j2 <25 and 25< pT_j2 < 30 GeV . The ΔЅ cross section is measured in the “γ + 3 jet” events in a single interval 15 –30 GeV.
50 < PT^{γ} < 90 GeV
PT ^{jet1} > 30 GeV
PT ^{jet2} , PT ^{jet3} > 15 GeV
50 < PT^{γ} < 90 GeV
PT ^{jet1} > 30 GeV
PT ^{jet2} , PT ^{jet3} > 15 GeV
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Differential Cross sections of photon+2(3) jets events
Phys.Rev. D, 83 052008 (2011); arXiv: 1101.1509 [hep-ex] Phys.Rev. D, 83 052008 (2011); arXiv: 1101.1509 [hep-ex]
The 3-rd jet of DP dijet is either not reconstructed or below the pT threshold in event selection
The 3-rd jet of DP dijet is either not reconstructed or below the pT threshold in event selection
CDF Phys. Rev.D 57(1998) 67 CDF Phys. Rev.D 57(1998) 67
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Differential Cross sections of photon+3(2) jets events
γ +1jet system overlaid with dijet system
γ +1jet system overlaid with dijet system
γ +1jet system overlaid with 1jet from dijet system
γ +1jet system overlaid with 1jet from dijet system
Phys.Rev. D, 83 052008(2011)
Phys.Rev. D, 83 052008(2011)
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-- Most preferable MPI models
P0 –the default model in Perugia family, CTEQ5L PDF P_nocr – excludes color reconnections in final state.
P0 –the default model in Perugia family, CTEQ5L PDF P_nocr – excludes color reconnections in final state.
P_hard hard ISR/FSR effects in P0 P-6, P-X based on CTEQ6L1, MRST LO * PDFs
P_hard hard ISR/FSR effects in P0 P-6, P-X based on CTEQ6L1, MRST LO * PDFs
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Triple Parton Fractions
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Summary: DP in gamma+ 2(3)jet events
1. The Δφ cross section and then the DP fraction in the “ γ + 2 jet” events are measured in 3 pT (jet 2) bins : 15< pT <20, 20< pT <25 and 25< pT <30 GeV . 2. The ΔЅ cross section is measured in the “γ + 3 jet” events in a single pT (jet 2) interval 15 –30 GeV. 3. The measurement in these intervals allows good sensitivity to the DP contribution and allows one to differentiate between various MPI models quite well. 4. Data favor new PYTHIA MPI models, Perugia tunes P0, P-hard, P-nocr, P-6, P-X tunes, while old MPI models with tunes A and W, are disfavored.
1. The Δφ cross section and then the DP fraction in the “ γ + 2 jet” events are measured in 3 pT (jet 2) bins : 15< pT <20, 20< pT <25 and 25< pT <30 GeV . 2. The ΔЅ cross section is measured in the “γ + 3 jet” events in a single pT (jet 2) interval 15 –30 GeV. 3. The measurement in these intervals allows good sensitivity to the DP contribution and allows one to differentiate between various MPI models quite well. 4. Data favor new PYTHIA MPI models, Perugia tunes P0, P-hard, P-nocr, P-6, P-X tunes, while old MPI models with tunes A and W, are disfavored.
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.
Photons test theory
fixed order: NLO resummation
PDFs
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(all quark/anti-quarksubprocesses)
direct photons emerge unaltered from the hard subprocess direct probe of the hard scattering dynamics
sensitivity to PDFs (gluon!) …but only if theory works
also fragmentation contributions:
suppress by isolation criterion observable: isolated photons
Direct Photon Production
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photon+b: agreement over full pT range: 30-150 GeV no PDF sensitivity
photon+c: - agree only at pT<50GeV - disagreement increases with photon pT
- using PDF including intrinsic charm (IC) improves the theory pT dependence
pT (GeV)
L = 1 fbL = 1 fb-1-1
Isolated Photon + HF Jet
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Phys. Rev. D, 81, 052012 (2010) Phys. Rev. D, 81, 052012 (2010)
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Double parton cross sections, D0
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Double parton cross sections, D0
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Double parton cross sections, CDF (1997)
N_2coll –number of beam crossings with 2 hard collisions
N_2coll –number of beam crossings with 2 hard collisions
N_1coll –number of beam crossings with 1 hard collision N_1coll –number of beam crossings with 1 hard collision
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photon+3jets
3 observable configurations yielding a photon + 3jets 3 observable configurations yielding a photon + 3jets
I. γ +1jet system over- laid with dijet system
I. γ +1jet system over- laid with dijet system
II. γ +2jet system (1j=gl) overlaid with 1jet from dijet system (1 lost)
II. γ +2jet system (1j=gl) overlaid with 1jet from dijet system (1 lost)
III. jet from dijet sys- tem substitute 1st jet
III. jet from dijet sys- tem substitute 1st jet
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Double parton cross sections, CDF (1997)
Nc(2) –number of beam crossings with 2 hard collisions
Nc(2) –number of beam crossings with 2 hard collisions
Nc(1) –number of beam crossings with 1 hard collision
Nc(1) –number of beam crossings with 1 hard collision
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photon+3jets & photon+2jets
2 observable configurations yielding a photon + 3jets 2 observable configurations yielding a photon + 3jets
γ +1jet system overlaid with dijet system
γ +1jet system overlaid with dijet system
γ +2jet system overlaid with 1jet from dijet system
γ +2jet system overlaid with 1jet from dijet system
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Differential Cross sections of photon+3(2) jets events
2 observable configurations yielding a photon + 3jets 2 observable configurations yielding a photon + 3jets
γ +1jet system overlaid with dijet system
γ +1jet system overlaid with dijet system
γ +2jet system overlaid with 1jet from dijet system
γ +2jet system overlaid with 1jet from dijet system
D0 arXiv: 1101.1509 [hep-ex], accepted by PRD D0 arXiv: 1101.1509 [hep-ex], accepted by PRD
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Summary: DP in gamma+ 3jet events
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Isolated Photon + Jet
pT (GeV)
quark-gluon subprocess fraction indifferent rapidity regions versus pT
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Differential Cross sections of photon+3(2) jets events
2 observable configurations yielding a photon + 3jets 2 observable configurations yielding a photon + 3jets
γ +1jet system overlaid with dijet system
γ +1jet system overlaid with dijet system
γ +2jet system overlaid with 1jet from dijet system
γ +2jet system overlaid with 1jet from dijet system
D0 arXiv: 1101.1509 [hep-ex], accepted by PRD D0 arXiv: 1101.1509 [hep-ex], accepted by PRD
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Dubna QCD group at D0 (JHEP, 1104:054 (2011)
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Backup
%d0%a4%d0%93%d0%9e%d0%a1%203 %20%d0%9b%d0%b5%d1%87%d0%b5%d0%b1%d0%bd%d0%be%d0%b5%20%d0%b4%d0%b5%d0%b
%d0%9d%d0%b0%d0%b2%d1%87%d0%b0%d0%bb%d1%8c%d0%bd%d0%be %d0%bc%d0%b5%d1%82%d0%be%d0%b4%d0%b8%d1%87%d0
%d0%9f%d0%be%d0%bb%d0%be%d0%b6%d0%b5%d0%bd%d0%b8%d0%b5 %d0%9f%d0%be%d1%81%d0%bb%d1%8b%20%d0%9f%d0%be