Measurements of event properties and multi-differential jet cross sections and impact of CMS measurements on Proton Structure and QCD parameters

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1 Measurements of event properties and multi-differential cross sections and impact of measurements on Proton Structure and QCD parameters Anterpreet Kaur Panjab University, Chandigarh (India On behalf of the Collaboration XLVII International Symposium on Multiparticle Dynamics (ISMD 7 September -, 7, laxcala, Mexico

2 Introduction Particle s : produced abundantly in the collisions of protons at the Large Hadron Collider (LHC provide an excellent opportunity for testing the predictions of perturbative Quantum Chromodynamics (pqcd at high energies important backgrounds for many new physics models Inclusive cross section measurement : gives important information about the strong coupling constant α S σ i- = σ(pp i s + X α i S provides a deep insight to understand the proton structure by deriving constraints on the parton distribution functions (PDFs Jet properties such as shapes, mass, charge etc. : key ingredients of Standard Model (SM physics measurements and for beyond SM physics searches σ (nb proton - (antiproton cross sections σ (E > s/ σ Z σ (E > GeV M H = GeV WJS { σ tot σ b σ W σ WW σ σ t ZZ σ ggh σ WH σ VBF evatron LHC. s (ev HE LHC events / sec for L = cm - s - Anterpreet Kaur (PU ISMD 7 September, 7 / 7

3 QCD multi production Anterpreet Kaur (PU ISMD 7 September, 7 / 7

4 Inclusive production pb GeV σ dy d dp y <. (. < y <. (. < y <. (. < y <. (. < y <. (. < y <. (. < y <.7 ( - Open: L =. pb int - Filled: L int = 9.7 fb C NLO NP C NLO NP 8 ev EWK Jet p [GeV] Measurement at 8 ev : Double-differential cross-section in p and y : d σ dp dy = N s ɛ L int,eff p ( y /heory ev /heory(c NLO NP EWK /heory(c NLO NP heory unc. Uncorrelated JES unc. Correlated JES unc. otal exp. sys. unc. - y <. Open: L =. pb int. - anti-k t (R =.7 Filled: L int = 9.7 fb Jet p (GeV (8 ev dy σ d (.7 ev / dy σ d dp dp /NP C heo. prediction C PDF uncertainty NNPDF. ABM HERAPDF. 8 anti-k t R =.7 < p < 7 GeV, upto y =.7 (L =. pb 7 < p < GeV, upto y =. (L = 9.7 fb Comparison to NLO parton-level calculations, including electroweak (EWK and non-perturbative (NP corrections Constraints on PDFs together with the fit of α S [Slide no., ] Ratios between different energies.7/8 and 7/8 : partial reduction of uncertainties y <. MMH Jet p (GeV JHEP (7 Anterpreet Kaur (PU ISMD 7 September, 7 / 7

5 Inclusive production dy (pb/gev σ / dp d Double-differential cross-section in p and y : d σ dp dy = N s ɛ L int,eff p y NLOJet++ C Anti-k t R =.7 - < 7 pb ( ev y <. (x. < y <. (x. < y <. (x. < y <. (x. < y <. (x. < y <. (x. < y <.7 (x Jet p (GeV Ratio to PH+P8 CUEM Ratio to PH+P8 CUEM Anti-k t R =.7 y <. Anti-k t R = y <. - 7 pb ( ev PH+P8 CUES-CEQL PH+P8 CUES-HERAPDF P8 CUEM Hpp CUES Exp. uncert. Jet p (GeV - 7 pb ( ev PH+P8 CUES-CEQL PH+P8 CUES-HERAPDF P8 CUEM Hpp CUES Exp. uncert. Jet p (GeV Measurement at ev : anti-k t R = and R =.7 p < ev; y < (L = 7 pb,. < y <.7 (L = pb P8+CUEM (LO agrees in shape in y <. Hpp+CUES (LO agrees in shape in all rapidity bins PH+P8 (NLO shows good agreement Ratio to PH+P8 CUEM Ratio to PH+P8 CUEM Anti-k t R =.7. < y <.7 - pb ( ev PH+P8 CUES-CEQL PH+P8 CUES-HERAPDF P8 CUEM Hpp CUES Exp. uncert. 8 Jet p (GeV Anti-k t R =. < y <.7 - pb ( ev PH+P8 CUES-CEQL PH+P8 CUES-HERAPDF P8 CUEM Hpp CUES Exp. uncert. 8 Jet p (GeV EPJC 7 ( Anterpreet Kaur (PU ISMD 7 September, 7 / 7

6 riple differential cross-section : d σ N dp,avg dy dy b = ɛ L int,eff p,avg y y b Measurement at 8 ev : anti-k t R =.7 (L = 9.7 fb Cross section as a function of the : average transverse momentum, p,avg = (p, + p, half the rapidity separation, y = y y boost of the two leading s, y b = y + y are well described in most of the phase spaces but some differences at high p,avg and y b Best suited to constrain PDFs and extract α S [Slide no., ] riple-differential dis y y y = Opposite side events Same side events d dp, avgdybdy * [pb/gev] yb = y + y Ratio to NNPDF. NLO EW NP yb < y * < Experimental uncertainty heoretical uncertainty C NLO EW NP MMH NLO EW NP ABM NLO EW NP 9.7fb (8 ev p, avg [GeV] Ratio to NNPDF. NLO EW NP yb < y * < Experimental uncertainty heoretical uncertainty C NLO EW NP MMH NLO EW NP ABM NLO EW NP arxiv:7.8 (Submitted to EPJC 9.7fb (8 ev yb < y * < ( yb < y * < ( yb < y * < ( yb < y * < ( yb < y * < ( yb < y * < ( NLOJE++ (NLO EW NP NNPDF. = p, e.y* anti kt R =.7 p, avg [GeV] 9.7fb (8 ev p, avg [GeV] Anterpreet Kaur (PU ISMD 7 September, 7 / 7

7 j j Inclusive multis Differential cross-section in H, / : dσ d(h, / = ( N event ɛ L int,eff H, / Measurement at 8 ev : anti-k t R =.7 (L = 9.7 fb - and - event cross sections as a function of H, / = (p, + p, are well described by theory predictions within uncertainty. EWK corrections explains the increasing excess of the - data w.r.t. theory ( ev - to - cross section ratio R : many uncertainties cancel and sensitive to α S [Slide no. ] / (pb/gev, dσ/d(h Ratios to NLO (C Preliminary 9.7 fb (8 ev anti-k t R =.7 y <. - n C NP EWK n C NP - H, / (GeV - Preliminary 9.7 fb (8 ev anti-k t R =.7 y <. n j /NP MSW8 NNPDF. Exp. Uncertainty heory Uncertainty. 8 H, / (GeV Ratios to NLO (C R Preliminary 9.7 fb (8 ev anti-k t R =.7 y <. n j /(NP EWK MSW8 NNPDF. Exp. Uncertainty heory Uncertainty H, / (GeV - Preliminary 9.7 fb (8 ev anti-k t R =.7 y <. R /NP C α s (M =. - Min. Value z C α s (M =.8 z C α s (M =.7 - Max. Value z. 8 H, / (GeV -PAS-SMP--8 Anterpreet Kaur (PU ISMD 7 September, 7 7 / 7

8 8 7 σ, Normalized differential cross-section in φ : dσ, d φ, (-, Measurement at ev : σj min anti-k t R = (L =.9 fb dσj min d φ min j Azimuthal correlations (- and - Normalized cross sections as a function of the : azimuthal angular separation between the two highest leading p s (-, - and - minimum azimuthal angular separation between any two of the three or four leading p s (- and - Spectrum gets flatter and become more sensitive to parton shower on moving from - to - to - Best agreement is given by Herwig7 POWHEG-J gives better results when matched with Pythia8 than Herwig++ POWHEG-J+Pythia8 is generally lower than POWHEG-J+Pythia8 An interesting tool to test the theoretical predictions of multi production processes -PAS-SMP-- dσ, - (rad, d φ σ, Preliminary p < p 8 < p 7 < p < p < p < p < p < p > GeV (x < GeV (x < GeV (x < 8 GeV (x < 7 GeV (x < GeV (x < GeV (x < GeV (x < GeV njets Anti-k t -.9 fb ( ev PH-J + Pythia8 CUEP8M - π / π/ π/ π Ratio to data R = φ (rad, - Preliminary.9 fb ( ev.8 p > GeV njets. Anti-k t R =. Exp. uncertainty. PH-J + Pythia8 CUEP8M PH-J + Herwig++ CUEHppS.8 PH-J + Pythia8 CUEP8M Herwig7 UE-MMH.8 8 < p < GeV < p < GeV < p < 7 GeV 7 < p < 8 GeV < p < GeV < p < GeV < p < GeV...8 π / π/ π/ π φ (rad, < p < GeV π / π/ π/ π φ (rad, Anterpreet Kaur (PU ISMD 7 September, 7 8 / 7

9 Azimuthal correlations -.9 fb ( ev -.9 fb ( ev - (rad dσ min j min d φ j min σ j 9 8 Preliminary p 8 < p 7 < p < p < p < p < p < p 7 > GeV (x < GeV (x < 8 GeV (x < 7 GeV (x < GeV (x < GeV (x < GeV (x < GeV njets Anti-k t R = PH-J + Pythia8 CUEP8M - (rad dσ min j min d φ j min σ j 9 8 Preliminary p 8 < p 7 < p < p < p < p < p < p 7 > GeV (x < GeV (x < 8 GeV (x < 7 GeV (x < GeV (x < GeV (x < GeV (x < GeV njets Anti-k t R = PH-J + Pythia8 CUEP8M π / π / π / π/ min φ (rad j π / π / π/ min φ (rad j Pythia8 (LO exhibits small deviations from the φ, and fails to describe φ min j Herwig++ exhibits the largest deviations from the φ, but provides a reasonable description of the φ min j MADGRAPH+Pythia8 provides a good overall description of the measurements except for φ min j in - case -PAS-SMP-- Anterpreet Kaur (PU ISMD 7 September, 7 9 / 7

10 Jet charge Measurement at 8 ev : anti-k t R =. (L = 9.7 fb p -weighted sum of the electric charges of the particles in a : Q κ = (p Q i (p κ i κ i QL κ = Q i (p i κ ( / p i κ i i Q κ = Q i (p i κ ( / p i κ i i Differentiate statistically s from quarks of different electric charge, or between gluon or quark s hree values of κ =., and., provide different sensitivities to the softer and harder particles in the Broader charge distribution on disabling the simulation of FSR in Pythia8 [/e] /N dn/dq [/e] /N dn/dq..8. p > GeV η < fb (8 ev Gluon Up quark Down quark.... κ= Leading- Q [e]...8. p > GeV η <. PH + P8 PH + P8 (No ISR PH + P8 (No FSR PH + P8 (No MPI PH (LO + P8.... κ= Leading- Q [e] fb (8 ev arxiv:7.88 (Submitted to JHEP MC MC Anterpreet Kaur (PU ISMD 7 September, 7 / 7

11 Normalized cross section Measurement at ev : anti-k t R =.8 (L =. fb 8 Di mass Double-differential cross section as a function of the mass and p : -PAS-SMP-- Soft drop (SD grooming algorithm removes low energetic constituents For ungroomed s : MC generators predictions agree with data within uncertainities for intermediate regions (. < m/p <. For groomed s : the mass peak is suppressed and the precision in the low and intermediate regions improves Sensitive to QCD parton showering; used in searches for new physics ( boosted objects - Preliminary. fb ( ev - GeV - GeV 7-9 GeV 9 - GeV - GeV - GeV 7 9- GeV - GeV PYHIA8 - GeV -7 GeV 8 - GeV Normalized cross section 8 Jet mass(gev - Preliminary. fb ( ev - GeV - GeV 7-9 GeV 9 - GeV - GeV - GeV 7 9- GeV - GeV PYHIA8 - GeV -7 GeV 8 - GeV Groomed mass(gev Normalized cross section heory Normalized cross section heory Preliminary. fb ( ev < p < GeV Stat. + Syst. Unc. Stat. Unc. Pythia8 HERWIG++ POWHEG + PYHIA8 Jet mass (GeV - Preliminary. fb ( ev < p < GeV. Stat. + Syst. Unc.. Stat. Unc. Pythia8 HERWIG++ POWHEG + PYHIA8 Frye et al Marzani et al Groomed mass (GeV Anterpreet Kaur (PU ISMD 7 September, 7 / 7

12 Electroweak production Anterpreet Kaur (PU ISMD 7 September, 7 / 7

13 Measurement at 8 ev : anti-k t R =. (L = 9. fb p (l > GeV, y(l <., 7 < M(ll < GeV; l = e, µ p (j > GeV, y(j <. Z + s Differential cross sections as functions of the H, p and y Double differential cross sections as a function of y and p, for the leading A large number of final-state partons should be included in the matrix element calculations in order to correctly describe the kinematics of the leading s Measurement at ev : anti-k t R = (L =. fb p (l > GeV, y(l <., 7 < M(ll < GeV; l = µ p (j > GeV, y(j <. Differential cross sections as a function of multiplicity, p and y for different multiplicities (upto s Good agreement with NLO and NNLO calculations JHEP (7 -PAS-SMP-- [pb/gev] dy(j (j σ/dp d fb (8 ev [pb/gev] (j dσ/dp Preliminary -. fb ( ev anti-k (R = Jets p > GeV, y <. Z/γ* µµ channel p.< y(j <. (.< y(j <. (.< y(j <. (.< y(j <. (.< y(j <. (.< y(j <. (.< y(j <.7 ( MG + PY ( SHERPA ( (ns MG_aMC + PY8 ( j LO + PS j NLO,,j LO + PS j NLO + PS amc@nlo + PY8 ( j NLO + PS (j [GeV] p (j [GeV] Anterpreet Kaur (PU ISMD 7 September, 7 / 7 amc@nlo/.. Stat. unc. (gen p (j [GeV]

14 7 8 9 p (j [GeV] p (j [GeV] PRD 9 (7 Measurement at 8 ev : anti-k t R =. (L = 9. fb Differential cross sections as functions of the multiplicity, H, and p for different multiplicities Very good agreement with NLO,, s FxFx and NNLO Important background for other measurements [pb / GeV] (j dσ / dp MG/ heory/ SHERPA/ fb (8 ev anti-k (R =. Jets p > GeV, η <. W ( µν + ( Stat (and syst uncert Stat and syst uncert Stat uncert MG + PY ( j LO + PS MG_aMC + PY8 ( j NLO + PS BLACKHA + SHERPA (NLO N ti NNLO SHERPA ( j NLO,j LO + PS W µν + s Measurement at ev : anti-k t R = (L =. fb Differential cross sections as a function of multiplicity, p, y and H for different multiplicities (upto at least s Good agreement with NLO and NNLO calculations [pb/gev] (j dσ/dp MG_aMC/ MG/ fb ( ev Preliminary anti-k p (R = Jets > GeV, y <. W µν channel Syst. + Stat. unc. (gen Stat. unc. (gen MG_aMC + PY8 ( j NLO + PS MG + PY8 ( j LO + PS N ti NNLO p (j [GeV] p (j [GeV] p (j [GeV] p (j [GeV] p (j [GeV] Anterpreet Kaur (PU ISMD 7 September, 7 / 7 NNLO/.. Syst. + Stat. unc. (gen -SMP-- (Submitted to PRD

15 V + b(b production Z l + b at 8 ev : anti-k t R =. (L = 9.8 fb b tagging : combined secondary vertex (CSV algorithm Differential cross sections as a function of p and η of the highest-p b, Z boson p, H, and φ Zb Ratios of the differential cross sections for Z(b and Z+s Z( b low-p region not well described, Z(bb generally agree with predictions W l + b at 8 ev : anti-k t R =. (L = 9.8 fb Exactly one l with p (l > GeV, η l <., Exactly two b s with p (j > GeV, η j <. Cross-section in agreement with Standard Model predictions σ W(lν+b b = ±.(stat ±.(syst ±.(theo ±.(lumi arxiv:.7 (Accepted in EPJC j [dσ(z+b / dp b ] / [dσ(z+j / dp ] (% / heory Z/γ*( ll + at least b anti-k (R =. s p > GeV, η < fb MadGraph FS + Pythia MadGraph FS + Pythia MadGraph-aMC@NLO + Pythia8 Powheg MINLO + Pythia8 MadGraph FS + Pythia, normalized to σ NNLO, stat. uncertainty only MadGraph FS + Pythia, normalized to σ NLO, stat. uncertainty only (8 ev MadGraph-aMC@NLO + Pythia8, normalized to σ NLO, stat. + syst. uncertainties only Powheg MINLO + Pythia8, normalized to σ NLO, stat. +syst. uncertainties only Leading (b/j p (GeV (pb/gev dσ b / dp / heory Z/γ*( ll + at least b s anti-k (R =. s p > GeV, η < fb MadGraph FS + Pythia MadGraph FS + Pythia MadGraph-aMC@NLO + Pythia8 Powheg MINLO + Pythia8 (8 ev 8 8 MadGraph FS + Pythia, normalized to σ NNLO, stat. uncertainty only MadGraph FS + Pythia, normalized to σ NLO, stat. uncertainty only MadGraph-aMC@NLO + Pythia8, normalized to σ NLO, stat. + syst. uncertainties only Powheg MINLO + Pythia8, normalized to σ NLO, stat. +syst. uncertainties only 8 8 Leading b p (GeV otal uncertainty PDF uncertainty DPI uncertainty MCFM (x Hadronization. ±. PDF ±. DPI pb MadGraph + Pythia F. ±. PDF pb MadGraph + Pythia F 9 ±. PDF ±. DPI pb MadGraph + Pythia8 F. ±. PDF ±. DPI pb EPJC 77 ( fb ±. (stat ±. (syst ±. (theo ±. (lumi pb (8 ev. σ(w(lν+bb [pb] Anterpreet Kaur (PU ISMD 7 September, 7 / 7

16 ] Measurement at 8 ev : anti-k t R =. (L = 9.7 fb Z ( e or µ + c Cross section σ(pp Z + c + X, σ(pp Z + c + X Cross section ratio σ(pp Z + b + X, inclusively and differentially as a function p of Z boson and with heavy flavour content Measurements are in agreement with the LO predictions from MADGRAPH and NLO predictions from MG amc Predictions from the MCFM program are lower than the measured σ(z + c, both inclusive and differentially Better description in terms of the Z + c/z + b cross sections ratio σ(pp Z + c + X = 8. ±.(stat ±.7(syst pb σ(pp Z + c + X/σ(pp Z + b + X =. ±.(stat ±.(syst pb -PAS-SMP--9 [pb] dσ(z+c/dp Preliminary 9.7 fb ( s = 8 ev... MADGRAPH MG_aMC MCFM (MSW8 MCFM (C MCFM (NNPDFIC Stat. uncertainty otal uncertainty [GeV] - p [GeV] p Anterpreet Kaur (PU ISMD 7 September, 7 / 7 ]/[dσ(z+b/dp [dσ(z+c/dp Preliminary fb ( s = 8 ev MADGRAPH MG_aMC MCFM (MSW8 MCFM (C MCFM (NNPDFIC Stat. uncertainty otal uncertainty

17 op Physics Anterpreet Kaur (PU ISMD 7 September, 7 7 / 7

18 Differential t t production cross section, l + s Measurement at 8 ev : ] - [GeV σ(tt d anti-k t R =. (L = 9.7 fb Dilepton e ± µ final state Normalized double-differential cross section as a function of six different pairs of kinematic variables : [p (t,y(t], [y(t,m(t t], [y(t t,m(t t], [ η(t, t,m(t t], [p (t t,m(t t], [ φ(t, t,m(t t] Significant improvement of g at high x as a function of M(t t-y(t t [Slide no. ] (tdy(t dp σ(tt fb (8 ev < y(t <.7.7 < y(t <.8.8 < y(t <.. < y(t <. O(α s [MNR] C µ C µ + PDF HERAPDF. Appr. O(α s [Diffop] C NNLO Measurement at ev : anti-k t R = (L =. fb l+s decay channels with a single µ or e in the final state Differential and Double-differential cross sections as a function of multiplicity and of kinematic variables of the t and t t system Measured p (t softer than expected except for Herwig++ MCs, as predicted by the NNLO and the NLO+NNLL QCD calculation ] - [pb GeV dσ h (t dp e/µ+s parton level -. fb ( ev Sys stat Stat POWHEG P8 POWHEG H++ MG P8 MG H++ MG P8 [FxFx] MG P8 [MLM] - Ratio to C EPJC 77 (7 9 p (t [GeV] heory..8 p (t [GeV] h 7 8 p (t [GeV] h PRD 9 (7 9 Anterpreet Kaur (PU ISMD 7 September, 7 8 / 7

19 t-channel single top quark production Measurement at ev : anti-k t R = (L =. fb Exactly one muon and at least two s with one b-tagged Separation between signal and background processes by a MVA technique Fit to the distribution of the discriminating variable yields a total cross section : σ(t-ch., t+ t= 8 ± (stat ± 9(syst pb A ratio of top quark and top antiquark production : R t-ch. =.8 ±.8(stat ±.(syst Absolute value of the CKM matrix element V tb :. ±.7(exp ±.(theo All results are in agreement with the Standard Model predictions. arxiv:.78 (Accepted in PLB t-channel total cross section (pb -. fb ( ev.8 ± C ABM ABM MMH HERAPDF. NNPDF..8 (stat ±. (syst....8 R t-ch. = σ t-ch.,t / σ t-ch.,t NLO+NNLL QCD ± (scale PDF Kidonakis, Phys. Rev. D 8 ( 9 - evatron.9 ev (L 9.7 fb Phys. Rev. Lett. ( - 7 ev (L =.7/. fb JHEP ( - 8 ev (L = 9.7 fb JHEP ( 9 - ev (L =. fb 8 s (ev Anterpreet Kaur (PU ISMD 7 September, 7 9 / 7

20 Measurement at 8 ev : Cambridge-Aachen R =. (L = 9.7 fb Vetoed > s with p > GeV Highly boosted t t events : Semileptonic decay : t bw with W lν l where l = e or µ Fully hadronic decay : t bw with W q q op mass Differential cross section as a function of mass (m : Slight overestimation of cross section in simulation. Normalized differential cross section as a function of mass (m : Consistent with other cross section measurements in boosted events. Peak position in the m distribution is sensitive to the top quark mass m t m t = 7.8 ± 9. GeV fb GeV d σ dm fb MADGRAPH+PYHIA MC@NLO+HERWIG POWHEG+PYHIA (8 ev Leading- m [GeV] EPJC 77 (7 7 Leading- m [GeV] Anterpreet Kaur (PU ISMD 7 September, 7 / 7 - GeV d σ dm σ fb m t =78. GeV m t =7. GeV m t =. GeV (8 ev

21 x g (x, Q f Fract. uncert Inclusive : D cross sections vs of p and rapidity Probes hadronic parton-parton interaction over a wide range of x and Q Constraints on PDFs : QCD analysis of data together with HERA DIS measurements, at NLO using HERAFfitter Significant impact on the gluon distribution in a new kinematic regime NLO HERA I+II DIS HERAPDF Method (Hessian Q = GeV HERA I+II DIS + s 8 ev JHEP ( Parton Distribution Functions determination x riple differential dis : D cross sections vs of average p, rapidity separation and boost xg(x, Q Rel. uncert. Use di cross section in the QCD analysis in addition to HERA data Change in the gluon shape similar as observed in the case of inclusive data Significant reduction of the uncertainty in g(x at high x 8 HERAPDF method (Hessian HERA I+II DIS HERA I+II DIS + dis Q = GeV arxiv: x Double-differential cross sections for top quark pair production : d-differential t t cross sections QCD analysis of data along with HERA inclusive DIS data and W asymmetry, using XFitter.. Best improvement comes from M(t t-y(t t Recommend to use both data sets for further improvement of g(x at high x f ref / xg(x, µ xg(x, µ xg(x µ = GeV NLO f ± HERA + W 8 ev HERA + s 8 ev ± HERA + W 8 ev + [y(tt, M(tt] 8 ev EPJC 77 ( x Anterpreet Kaur (PU ISMD 7 September, 7 / 7

22 he strong coupling constant α S Inclusive [JHEP (7 ] : Least square minimization on p (y spectrum using NLO parton level predictions Using the C NLO PDF set α S (M Z = (exp.9 (PDF ±. (NP.8 (scale χ 9 9 JHEP (7-9.7 fb (8eV χ [α S (M ] Z Polynomial Fit +.9 α S (M = Z -. (µ /µ, µ /µ = (, R F χ /N min Bins = 8./8 Multis [-PAS-SMP--8] : - to - cross section ratio, R α S Insensitive to many theoretical and experimental systematics Using the MSW8 PDF set α S (M Z =. ±. (exp ±. (PDF ±. (NP +.. (scale α S (Q...8 Preliminary α (M +..8 R preliminary, s = 8eV, α S (M =. z -. R preliminary, s = 8eV Incl.Jet, s = 8eV R, s = 7eV Incl.Jet, s = 7eV tt, s = 7eV -Jet Mass, ALAS EEC, D Incl.Jet s s = 7eV = 7 ev D Angular Correlation H ZEUS World Avg α S (M =.8 ± z. riple differential dis [arxiv:7.8] : Precise α S extraction together with PDF fit α S (M Z =.99 ±. (exp ±. (mod (par.9 (scale Q (GeV α PDG S =.8±. Anterpreet Kaur (PU ISMD 7 September, 7 / 7

23 Summary Jet production in pp collisions is one of the main phenomenological predictions of pqcd. Measurements of characteristics of events with s, from -charge over investigations of shapes to mass distributions are presented. Compared to theoretical predictions including those matched to parton shower and hadronization. Multi-differential cross-sections over a wide range in transverse momenta from inclusive s to multi- final states are measured. Impact on the determination of the strong coupling constant α S as well as on parton density functions (PDFs Electroweak boson production : inclusive or associated with charm or beauty quarks give insight into the flavour separation of the proton sea. Measurements of cross sections of and top-quark pair production are in particular sensitive to the gluon distribution in the proton and α S. HANKS!! Anterpreet Kaur (PU ISMD 7 September, 7 / 7

24 Back-Up Slides Anterpreet Kaur (PU ISMD 7 September, 7 / 7

25 riple-differential dis gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev.. yb < y * < p, avg [GeV].. yb < y * < p, avg [GeV].. yb < y * < p, avg [GeV] gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev gg s gq s (xg < xq gq s (xg > xq.8 Subprocess fraction. qiqi s qiqj s qiqi s qiqj s 8 ev.. yb < y * < p, avg [GeV].. yb < y * < p, avg [GeV].. yb < y * < p, avg [GeV] arxiv:7.8 Anterpreet Kaur (PU ISMD 7 September, 7 / 7

26 Jet charge [/e] /N dn/dq L p > GeV η < fb (8 ev PH + P8 PH + P8 (No ISR PH + P8 (No FSR PH + P8 (No MPI PH (LO + P κ= Leading- Q [e] L. [/e] /N dn/dq p > GeV η < fb (8 ev PH + P8 PH + P8 (No ISR PH + P8 (No FSR PH + P8 (No MPI PH (LO + P κ= Leading- Q [e]. MC MC MC MC Anterpreet Kaur (PU ISMD 7 September, 7 / 7

27 f Parton Distribution Functions determination Rel. uncert. f xg(x, Q 9 HERAPDF method (Hessian 8 HERA I+II DIS + dis HERA I+II DIS + inc. s 7 Q = GeV arxiv: x ref / xg(x, µ δxg(x, µ xg(x µ = GeV f ± HERA + W + y(tt 8 ev + [y(tt, M(tt] 8 ev EPJC 77 (7 9 - NLO 8 ev - x Anterpreet Kaur (PU ISMD 7 September, 7 7 / 7