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@PHDTHESIS{Gangal:275847,
      author       = {Gangal, Shireen},
      title        = {{P}recision {P}redictions of {E}xclusive {J}et {C}ross
                      {S}ections at the {LHC}},
      issn         = {1435-8085},
      school       = {Universität Hamburg},
      type         = {Dr.},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2015-04278, DESY-THESIS-2015-042},
      series       = {DESY-THESIS},
      pages        = {159},
      year         = {2015},
      note         = {Universität Hamburg, Diss., 2015},
      abstract     = {With the discovery of the Higgs boson, a central objective
                      of the LHC Higgs program is to study its properties in
                      detail by exploring different production and decay channels.
                      This requires precise theoretical predictions of inclusive
                      cross sections as well as differential and exclusive cross
                      sections. In this thesis, we study perturbative
                      uncertainties in the fixed-order (FO) predictions of
                      exclusive jet cross sections and obtain resummed predictions
                      for a new class of rapidity-dependent jet veto observables,
                      focusing on Higgs production via gluon gluon fusion (ggF) at
                      the LHC. Experimental analyses at the LHC often use jet
                      binning and jet selection cuts to distinguish between
                      different Higgs production mechanisms and to separate signal
                      from backgrounds. Such jet vetoes and jet selection cuts
                      induce Sudakov logarithms of the ratio of the veto scale and
                      the hard scale in the process. In the limit of very tight
                      jet vetoes, these logarithms can become large and introduce
                      large uncertainties in the FO predictions of cross sections.
                      By resumming these large logarithms to all orders, the
                      perturbative uncertainties can be considerably reduced.
                      Whether in FO or resummed predictions, a consistent
                      treatment of uncertainties in different jet bins is
                      required. In the first part of the thesis, we studied in
                      detail the perturbative uncertainties in the NLO predictions
                      for pp -> H+2-jets via ggF for the vector boson fusion (VBF)
                      selection cuts used by ATLAS and CMS in their H ->
                      $\gamma\gamma$ analyses. Our study shows that, while
                      applying strong restrictions on additional emissions is
                      expected to increase the sensitivity to the VBF signal and
                      reduce the ggF contribution, it is not necessarily
                      beneficial for distinguishing the VBF and ggF production
                      modes because of the quickly increasing ggF uncertainties.
                      In the second part of the thesis, we introduce
                      rapidity-dependent jet veto observables for which the
                      transverse momentum of a jet is weighted by a smooth
                      function of the jet rapidity. These jet-based observables
                      provide natural and clean ways to veto central jets and can
                      yield valuable complementary information in the exclusive
                      jet bins. Using Soft Collinear Effective Theory (SCET), we
                      study the factorization and resummation properties of these
                      rapidity-dependent observables and obtain predictions for
                      the resummed H+0-jet cross section at NLL$^\prime$ with a
                      veto on these observables. Because the experimentally
                      relevant region is an intermediate one, where both the
                      resummed and the FO contributions are important, we
                      calculate the FO corrections at NLO and combine them with
                      our resummed predictions to obtain the full NLL$^\prime$ +
                      NLO result for the H+0-jet cross section. We compare our
                      numerical predictions with the differential cross section
                      measurement by ATLAS in the H-> $\gamma \gamma$ channel and
                      find good agreement. At $O(\alpha_s^2)$, these jet-based
                      observables have a non trivial dependence on the
                      jet-algorithm due to clustering effects. In the final part,
                      we consider the corrections due to clustering of two
                      collinear or soft particles into a single jet which are an
                      important input for predicting the cross section at
                      NNLL$^\prime$ + NNLO. These corrections are numerically
                      significant for the jet radii currently used in
                      experiments.},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/DESY-THESIS-2015-042},
      url          = {https://bib-pubdb1.desy.de/record/275847},
}