Southern Methodist University February 13-15, 2017 Introduction - PowerPoint PPT Presentation

Santa Fe Jets and Heavy Flavor Workshop Vector boson production in pPb and PbPb collisions at the LHC and its impact on nCTEQ15 PDFs arxiv: 1610.02925 Florian Lyonnet with A. Kusina, D.B. Clark, E. Godat, T. Jezo, K. Kovarik, F.I. Olness, I. Schienbein, J.Y. Yu Southern Methodist University February 13-15, 2017

Introduction W/Z@LHC Reweighting Conclusion Methodology: Parametrization: ◮ e.g. xg p/A ( x, Q 2 ) = c 0 x c 1 (1 − x ) c 2 e c 3 x (1 + e c 4 x ) c 5 ◮ c k → c k, 0 + c k, 1 (1 − A − c k, 2 ) 3 10 NMC EMC Global fit to various SLAC BCDMS experimental data 2 10 Hermes FNAL E665 DY: FNAL ◮ DIS Q 2 [GeV 2 ] 1 10 ◮ DY ◮ Pion production 0 10 -1 10 -4 -3 -2 -1 0 10 10 10 10 10 x 10 − 2 ≤ x ≤ 0 . 7 Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 2 / 20

Introduction W/Z@LHC Reweighting Conclusion Methodology: Parametrization: ◮ e.g. xg p/A ( x, Q 2 ) = c 0 x c 1 (1 − x ) c 2 e c 3 x (1 + e c 4 x ) c 5 ◮ c k → c k, 0 + c k, 1 (1 − A − c k, 2 ) 2.5 DIS DIS 8 π 0 DIS DIS DIS DY DIS DY DIS & & 2.0 DY DY 1.5 χ 2 / dof 1.0 47 28 28 12 2 9 7 32 14 26 33 3 111 14 11 28 27 21 3 0.5 3 14 3 2 14 32 7 0.0 Fe/D Fe/Be Fe/C He/D Li/D Be/D C/D N/D Al/D Ca/D Cu/D Kr/D Ag/D Sn/D Xe/D W/D Au/D Pb/D C/Li Ca/Li W/Be Be/C Al/C Ca/C Sn/C Pb/C DAu/pp Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 2 / 20

Introduction W/Z@LHC Reweighting Conclusion Methodology: Parametrization: ◮ e.g. xg p/A ( x, Q 2 ) = c 0 x c 1 (1 − x ) c 2 e c 3 x (1 + e c 4 x ) c 5 ◮ c k → c k, 0 + c k, 1 (1 − A − c k, 2 ) nCTEQ15 A total of 740 points after kinematical cuts ◮ χ 2 = 587 . 4 ⇒ χ 2 /d.o.f = 0 . 81 Error analysis via the Hessian method ◮ 32 Eigenvalues Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 2 / 20

Introduction W/Z@LHC Reweighting Conclusion 16 0.7 A=1 14 g s 0.6 A=4 A=9 12 A=12 0.5 A=27 10 A=40 0.4 xf p/A xf p/A A=56 8 A=84 0.3 A=119 6 A=131 0.2 A=197 4 A=208 0.1 2 0 0.0 -1 -1 10 -3 10 -2 10 1 10 -3 10 -2 10 1 x x 0.6 0.35 u v d v 0.30 0.5 0.25 0.4 0.20 xf p/A xf p/A 0.3 0.15 0.2 0.10 0.1 0.05 0.0 0.00 -3 -2 -1 -3 -2 -1 10 10 10 1 10 10 10 1 x x 0.9 0.9 0.8 u 0.8 d 0.7 0.7 0.6 0.6 xf p/A 0.5 xf p/A 0.5 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 -3 -2 10 -1 -3 -2 10 -1 10 10 1 10 10 1 x x 0.8 0.8 ¯ ¯ 0.7 u 0.7 d 0.6 0.6 0.5 0.5 xf p/A xf p/A 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 10 -3 10 -2 10 -1 1 10 -3 10 -2 10 -1 1 x x Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 3 / 20

Introduction W/Z@LHC Reweighting Conclusion Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 4 / 20

Introduction W/Z@LHC Reweighting Conclusion To go further: Include LHC data on pP b (and possibly P b P b ) collisions ◮ LHCb: σ ( Z → ℓ + ℓ − ) ◮ ALICE: σ ( W +( − ) → ℓ +( − ) ν (¯ ν )) ◮ ATLAS: dσ ( Z → ℓ + ℓ − ) /dy , dσ ( W +( − ) → ℓ +( − ) ν (¯ ν )) /dy, A ℓ ◮ CMS: dσ ( Z → ℓ + ℓ − ) /dy , dσ ( W +( − ) → ℓ +( − ) ν (¯ ν )) /dy, A ℓ , A FB √ s pp = 7 TeV ⇒ � s P b P b = 2 . 76 TeV √ s pp = 8 TeV ⇒ � s pP b = 5 . 02 TeV Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 5 / 20

Introduction W/Z@LHC Reweighting Conclusion To go further: Include LHC data on pP b (and possibly P b P b ) collisions ◮ LHCb: σ ( Z → ℓ + ℓ − ) ◮ ALICE: σ ( W +( − ) → ℓ +( − ) ν (¯ ν )) ◮ ATLAS: dσ ( Z → ℓ + ℓ − ) /dy , dσ ( W +( − ) → ℓ +( − ) ν (¯ ν )) /dy, A ℓ ◮ CMS: dσ ( Z → ℓ + ℓ − ) /dy , dσ ( W +( − ) → ℓ +( − ) ν (¯ ν )) /dy, A ℓ , A FB √ s pp = 7 TeV ⇒ � s P b P b = 2 . 76 TeV √ s pp = 8 TeV ⇒ � s pP b = 5 . 02 TeV ⇒ Vector boson production in pP b and P b P b collisions at the LHC Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 5 / 20

Introduction W/Z@LHC Reweighting Conclusion I) Introduction II) LHC pP b and P b P b data III) Impact on the nCTEQ15 fit - Reweighting Analysis IV) Conclusion Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 6 / 20

Introduction W/Z@LHC Reweighting Conclusion Kinematics x 2 is the momentum fraction in the Lead nucleus p S 5 2 = . . 0 7 8 2 6 T T T e e e V V V 1 4 − = y 3 − 10 − 1 = y 2 − = y 1 − = 10 − 2 y x 2 0 = y 1 = y 10 − 3 Z W ± 2 = y Z 3 = W ± y Z 10 − 4 4 W ± = y 10 − 4 10 − 3 10 − 2 10 − 1 1 x 1 Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 7 / 20

Introduction W/Z@LHC Reweighting Conclusion Kinematics x 2 is the momentum fraction in the Lead nucleus 4 ATLAS CMS LHCb ALICE 3 2 1 0 y 1 2 3 W ± Z A W A Z 4 ℓ FB A W FB 5 10 -4 10 -3 10 -2 10 -1 10 0 x 2 Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 7 / 20

Introduction W/Z@LHC Reweighting Conclusion Kinematics x 2 is the momentum fraction in the Lead nucleus 4 ATLAS CMS LHCb ALICE 3 2 1 0 y 1 2 3 W ± Z A W A Z 4 ℓ FB A W FB 5 10 -4 10 -3 10 -2 10 -1 10 0 x 2 All predictions @NLO using custom FEWZ Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 7 / 20

Introduction W/Z@LHC Reweighting Conclusion P b P b 0.7 0.6 0.5 0.4 dσ dy Z σ tot 0.3 1 0.2 p s =2 . 76 TeV CMS Z → µµ PbPb , 0.1 nCTEQ15 CT10 0.0 0.0 0.5 1.0 1.5 2.0 1.4 1.2 R 1.0 0.8 0.6 0.0 0.5 1.0 1.5 2.0 y Z CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 8 / 20

Introduction W/Z@LHC Reweighting Conclusion P b P b 0.30 0.25 0.20 dy Z dσ σ tot 1 0.15 p s = 2 . 76 TeV 0.10 ATLAS Z PbPb nCTEQ15 CT10 0.05 3 2 1 0 1 2 3 1.4 1.2 R 1.0 0.8 0.6 3 2 1 0 1 2 3 y Z CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 8 / 20

Introduction W/Z@LHC Reweighting Conclusion P b P b 0.4 0.3 0.2 0.1 A l 0.0 0.1 0.2 p s = 2 . 76 TeV ATLAS PbPb , W char . asym . 0.3 nCTEQ15 CT10 0.4 0.0 0.5 1.0 1.5 2.0 2.5 3 2 1 R 0 1 2 0.0 0.5 1.0 1.5 2.0 2.5 | y l | CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 8 / 20

Introduction W/Z@LHC Reweighting Conclusion P b P b 0.4 0.3 0.2 0.1 A l 0.0 0.1 0.2 p s = 2 . 76 TeV CMS PbPb , W char . asym . 0.3 nCTEQ15 CT10 0.4 0.0 0.5 1.0 1.5 2.0 6 4 2 R 0 2 4 6 0.0 0.5 1.0 1.5 2.0 | y l | CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 8 / 20

Introduction W/Z@LHC Reweighting Conclusion P b P b Comments Not really sensitive to nuclear corrections Uncertainties too large to bring constraints on nPDFs Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 8 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : Z 35 30 dσ ( Z → ll ) /dy Z [nb] 25 20 15 10 p s = 5 . 02 TeV ATLAS pPb nCTEQ15 Data 5 CT10 0 3 2 1 0 1 2 3 1.50 1.25 R 1.00 0.75 0.50 3 2 1 0 1 2 3 y Z CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 9 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : Z 25 dσ ( Z → ll ) /dy Z [nb] 20 15 10 p s = 5 . 02 TeV CMS pPb 5 nCTEQ15 Data CT10 0 2 1 0 1 2 1.4 1.2 R 1.0 0.8 0.6 2 1 0 1 2 y Z CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 9 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : W + 100 dσ ( W + → l + ν ) /dy l + [nb] 80 60 40 p s = 5 . 02 TeV ATLAS pPb 20 nCTEQ15 Data CT10 0 2 1 0 1 2 1.4 1.2 R 1.0 0.8 0.6 2 1 0 1 2 y l + CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 10 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : W + 120 dσ ( W + → l + ν ) /dy l + [nb] 100 80 60 40 p s = 5 . 02 TeV CMS pPb 20 nCTEQ15 Data CT10 0 2 1 0 1 2 1.4 1.2 R 1.0 0.8 0.6 2 1 0 1 2 y l + CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 10 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : W − 120 ν ) /dy l − [nb] 100 80 dσ ( W − → l − ¯ 60 40 p s = 5 . 02 TeV CMS pPb 20 nCTEQ15 Data CT10 0 2 1 0 1 2 1.4 1.2 R 1.0 0.8 0.6 2 1 0 1 2 y l − CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 10 / 20

Introduction W/Z@LHC Reweighting Conclusion pP b : W − 100 ν ) /dy l − [nb] 80 60 dσ ( W − → l − ¯ 40 p s = 5 . 02 TeV ATLAS pPb 20 nCTEQ15 Data CT10 0 2 1 0 1 2 1.4 1.2 R 1.0 0.8 0.6 2 1 0 1 2 y l − CT10: Lead nucleus made of CT10 protons Florian LYONNET Santa Fe Jets and Heavy Flavor Workshop February 13-15, 2017 10 / 20