Please use this identifier to cite or link to this item:

Application of perturbative quantum chromodynamics to processes with heavy quarks

File Description Size Format  
Biswas Sandip r.pdf Version for non-UH users. Copying/Printing is not permitted 718.87 kB Adobe PDF View/Open
Biswas Sandip uh.pdf Version for UH users 713.49 kB Adobe PDF View/Open

Item Summary Biswas, Sandip 2016-04-13T21:19:09Z 2016-04-13T21:19:09Z 2010-12
dc.description Ph.D. University of Hawaii at Manoa 2010.
dc.description Includes bibliographical references.
dc.description.abstract In this thesis we discuss application of perturbative QCD to processes involving bottom and top quarks. We begin by considering the semileptonic B-meson decay to charmed final states B → Xcℓνℓ. We calculate two-loop QCD corrections to the partonic contribution to this process, given by the free b-quark decay b → cℓνℓ. We consider cases where the charged lepton in the final state is massless (e) or massive (τ ). We review techniques used in the computation of O(α2s) corrections to inclusive semileptonic b → c transitions and present extensive numerical studies of the two-loop QCD effects in b → cℓ¯νℓ decays, for ℓ = e, τ . Next, we explore determination of the top quark mass at hadron colliders, by studying correlations between kinematics of top quark decay products and the top quark mass. Some of these observables are anticipated to yield one percent accuracy (or better) in the extracted value of the top quark mass mt. The residual uncertainties in mt are mostly theoretical; they are usually estimated using parton shower Monte Carlo programs whose reliability at this level of precision is difficult to assess. We employ perturbative QCD at next-to-leading order to describe these observables and estimate the uncertainties in the values of mt that are extracted from them. We contrast these estimates with the results obtained by means of traditional parton showers for a few observables, often discussed in the context of high-precision top quark mass measurements at the LHC. We find that the parton showers are good in estimating central values, but that perturbative QCD provides us with both accurate central values and a trustworthy estimate of the uncertainties in the extracted value of the top quark mass mt.
dc.language.iso eng
dc.publisher [Honolulu] : [University of Hawaii at Manoa], [December 2010]
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Physics.
dc.subject perturbative quantum chromodynamics
dc.subject heavy quarks
dc.title Application of perturbative quantum chromodynamics to processes with heavy quarks
dc.type Thesis
dc.type.dcmi Text
Appears in Collections: Ph.D. - Physics

Please email if you need this content in ADA-compliant format.

Items in ScholarSpace are protected by copyright, with all rights reserved, unless otherwise indicated.