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Threshold Resummation for Electroweak Gauge Boson Pair at the LHC

Threshold Resummation for Electroweak Gauge Boson Pair at the LHC. Yan Wang Institute of Theoretical Physics, PKU In collaboration with Chong Sheng Li, Ze Long Liu, Ding Yu Shao. 2014 Sun Yat-sen University 2014-05-16. Background for the Higgs boson. arXiv:1310.3687 ( hep -ex).

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Threshold Resummation for Electroweak Gauge Boson Pair at the LHC

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  1. Threshold Resummation for Electroweak Gauge Boson Pair at the LHC Yan Wang Institute of Theoretical Physics, PKU In collaboration with Chong Sheng Li, Ze Long Liu, Ding Yu Shao 2014 Sun Yat-sen University 2014-05-16

  2. BackgroundfortheHiggsboson arXiv:1310.3687 (hep-ex)

  3. AnomalousTripleGaugecouplings aTGC in effective Lagrangian

  4. AnomalousTripleGaugecouplings In SM no neutral TGC vertex. Forbidden Charged TGC vertex

  5. AnomalousTripleGaugecouplings At interesting region aTGCeffects: increase cross sections at high invariant mass () and its proxies: Loops contribute: Some New physics :

  6. DibosonExperimentsvsNLOpredictions

  7. T. Gehrmann, L. Tancredi And E. Weihs, JHEP 1308 (2013) 070 J. M. Henn, K. Melnikov And V. A. Smirnov, Arxiv:1402.7078 T. Gehrmann, A. Von Manteuffel, L. Tancredi And E. Weihs, Arxiv:1404.4853 F. Caola, J. M. Henn, K. Melnikov And V. A. Smirnov, Arxiv:1404.5590 Master integral ZZ NNLO F. Cascioli, T. Gehrmann, M. Grazzini, Et.Al. Arxiv:1405.2219

  8. Whyresummation Generic observable in hadron collisions at energy : Partonluminosity. For the parton cross section , it can be expanded as

  9. Whyresummation When s is close to , since is also close to 1. The perturbative expansion is unreliable in this region. The effect of soft-gluon resummationcan be relevant even relatively far from the hadronicthreshold. T. Becher, M. Neubert and G. Xu, JHEP 0807 (2008) 030 [arXiv:0710.0680 [hep-ph]]

  10. Factorizationformulas Define Expansion of the Hard function.

  11. Determine soft scale Soft & Hard scale dependence

  12. Factorizationformulas Including the nonsingular terms

  13. Factorization scale dependence

  14. effects Compare with POWHEG Distribution at the LHC K-factor for resummation

  15. Compare with Experiments

  16. CONCLUSION • Presenting NLO + NNLL thersholdresummation for gauge boson pair productions. • Improve NLO cross section about 8% for ZZ and 12% for WZ • Agree with POWHEG and experimental data very well.

  17. THANKYOU

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