The main subject of the habilitation thesis is study of jets produced in high-energy
proton-proton (p+p) and nucleus-nucleus (A+A) collisions at the colliders RHIC at
BNL and the LHC at CERN, respectively. Jets produced in p+p collisions serve not
only to test predictions of quantum chromodynamics (QCD) in perturbative regime,
but they are also an important reference measurement for A+A collisions in which
conditions suitable for creation of a new state of QCD matter, the quark-gluon plasma
(QGP), are expected to occur. Jets, collimated showers of particles, are created in
hadronization of partons originating from hard scattering in the initial phase of the
collision and are thus an ideal tool to peform tomography of QGP. Direct reconstruction
of jets in large and fluctuating background of particles created in the heavy-ion collision
is challenging and other methods such as studies of inclusive particle production with
large transverse momentum or di-hadron correlations are explored as well.
The habilitation thesis summarizes in three main chapters results achieved in stud ies of inclusive jet spectra, fragmentation functions and other jet properties in p+p
collisions in the ALICE experiment. Next, results on di-hadron correlations including
long-range correlations in pseudorapidity (the so called ridge) in A+A collisions in the
ALICE and STAR experiments are discussed. Finally, results of inclusive jet spectra
and their nuclear modification factors, jet radial profile, hadron+jet correlations, and
baryon/meson ratios of strange particles in jets in A+A collisions in the ALICE and
STAR experiments are presented. Wherever possible the results are compared with
suitable theoretical models and other experiments.
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en
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ČVUT. Fakulta jaderná a fyzikálně inženýrská.
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dc.subject
QCD
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jets
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quark-gluon plasma
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jet quenching
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jety
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kvarkovo-gluonové plazma
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zhášení jetů
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dc.title
Production of Jets at RHIC and LHC
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habilitation thesis
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habilitační práce
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theses.degree.grantor
České vysoké učení technické v Praze. Fakulta jaderná a fyzikálně inženýrská.
dc.description.abstract-translated
Hlavn´ım t´ematem habilitaˇcn´ı pr´ace je studium jet˚u produkovan´ych ve vysokoener getick´ych proton-protonov´ych (p+p) a j´adro-jadern´ych (A+A) sr´aˇzk´ach na urychlovaˇci
RHIC v laboratoˇri BNL a urychlovaˇci LHC v laboratoˇri CERN. Jety produkovan´e v
p+p sr´aˇzk´ach slouˇz´ı nejenom k testov´an´ı predikc´ı kvantov´e chromodynamiky (QCD) v
poruchov´em reˇzimu, ale jsou tak´e d˚uleˇzit´ym referenˇcn´ım mˇeˇren´ım pro A+A sr´aˇzky,
ve kter´ych se oˇcek´av´a nastolen´ı podm´ınek pro vznik nov´eho stavu jadern´e hmoty,
tzv. kvarkovo-gluonov´eho plazmatu (QGP). Jety, kolimovan´e sprˇsky ˇc´astic, vznikaj´ı
hadronizac´ı parton˚u poch´azej´ıc´ıch z tvrd´eho rozptylu v poˇc´ateˇcn´ı f´azi sr´aˇzky a jsou tak
ide´aln´ım n´astrojem pro tomografii QGP. Jejich pˇr´ım´a rekonstrukce na velk´em a silnˇe
fluktuuj´ıc´ım pozad´ı ostatn´ıch ˇc´astic vznikaj´ıc´ıch ve sr´aˇzce je vˇsak n´aroˇcn´a a proto jsou
pouˇz´ıv´any i jin´e metody jako je studium inkluzivn´ıch spekter ˇc´astic s vysokou pˇr´ıˇcnou
hybnost´ı nebo dihadronov´e korelace.
Habilitaˇcn´ı pr´ace shrnuje ve tˇrech hlavn´ıch kapitol´ach v´ysledky dosaˇzen´e ve studiu
inkluzivn´ıch spekter jet˚u, fragmentaˇcn´ıch funkc´ı a dalˇs´ıch vlastnost´ı jet˚u v p+p sr´aˇzk´ach
v experimentu ALICE. D´ale jsou diskutov´any v´ysledky dosaˇzen´e v oblasti v´yzkumu di hadronov´ych korelac´ı vˇcetnˇe korelac´ı s dlouh´ym dosahem v pseudorapiditˇe (tzv. ridge)
v A+A sr´aˇzk´ach v experimentech ALICE a STAR. V neposledn´ı ˇradˇe jsou diskutov´any
v´ysledky inkluzivn´ıch spekter jet˚u a jejich jadern´e modifikaˇcn´ı faktory, radi´aln´ı pro fil jet˚u, hadron+jet korelace a baryon/mezonov´e pomˇery podivn´ych ˇc´astic v jetech v
A+A sr´aˇzk´ach v experimentech ALICE a STAR. Tam, kde je to moˇzn´e, jsou v´ysledky
tak´e porovn´any s dostupn´ymi teoretick´ymi modely a jin´ymi experimenty.
