Gluon pdf constraints from the ratio of forward heavy. The scale m mh is generally the lowest scale where the heavy quark pdf is typically used. On measuring the kinetic energy of the heavy quark inside b mesons. Pdf dijet conical correlations associated with heavy. We investigate the impact of displaced heavy quark matching scales in a global fit. Following this logic, one might argue that its contribution in the action is. Violations of local duality in the heavy quark sector. Quark solutions automate the process with reusable smart content components, dynamically. In contrast, in the variable flavor number scheme vfns, the heavy quark is included as a parton in the pdf at scales above the m m matching scale. In the heavyquark sector the most natural ones to exploit are the.
Aspects of heavy quark theory connecting repositories. Heavy quark effective field theory harvard university. Remarks on the heavyquark flavour symmetry for doubly heavy. In principle, one could go to lower scales, but the heavy quark pdfs become negative in this region and one must be careful about delicate. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. A softly interacting heavy quark is nearly onshell. Heavy quark spectroscopy at lhcb daniel craik university of edinburgh 23rd august, 2016 on behalf of the lhcb collaboration. A logical next step would be to use the d0 track and the track of the d. Gluon pdf constraints from the ratio of forward heavyquark production at the lhc at s 7 and tev.
Quark model hadrons isospin, strangeness quark model 3 flavours u, d, s mesons pseudoscalar and vector mesons baryons decuplet, octet hadron masses spinspin coupling heavy quarks charm, bottom, heavy quark mesons top quark motivation for quark model particle zoo proliferates the finder of a new particle used to be rewarded. Quark develops a content automation platform that helps organizations streamline the creation, management, publishing and delivery of businesscritical content. While the top quark is the heaviest known quark, the stop squark is actually often the lightest squark in many supersymmetry models overview. In particular the production of open beauty and j in hadronic collisions at x ed target energies is discussed. In such a picture the heavy quark acts as an active quark in the qcd evolution.
Pdf violations of local duality in the heavy quark sector. Gluon pdf constraints from the ratio of forward heavy quark production at the lhc at v s 7andtev matteo cacciari1,2,3,4,a, michelangelo l. We study the variation of the matching scales, and their. The operator product expansion ope for heavy light quark pseudoscalar mesons dmesons and bmesons in medium is determined, both for a moving meson with respect to the surrounding medium as. An introduction to the quark model garth huber prairie universities physics seminar series, november, 2009. Our main result is that higherorder corrections lead to an enhanced suppression for heavy quark jets relative to the leading bdmpsz result, corresponding to the quenching of a single parton. Appli cations to inclusive semileptonic decays and to interactions with light mesons. Realistic fragmentation functions 9 exhibit a partonmodelmotivated maximum at hereafter m is the heavy quark mass 1. Introductory lectures on heavy quarks and heavy quark effective field theory. In the picture of dipole scattering the cross section for heavy quark antiquark.
Heavyquark e ective theory matthias neubert theory division, cern, ch1211 geneva 23, switzerland abstract we give an introduction to the heavyquark e ective theory and the 1m qexpansion, which provide the modern framework for a systematic, modelindependent description of the properties and decays of hadrons containing a heavy quark. Due to a phenomenon known as color confinement, quarks are never directly observed or found in isolation. The heavy quark theory in qcd was nally formalized in refs. The most logical choice would be to use gluon longitudinal.
A logical model of homology for comparative biology. George street toronto, ontario canada m5s1a7 email. The parton density functions pdf evolve on the factorisation scale 2. Heavy quark physics in heavy ion collisions ect, trento, italy 1620 march, 2015 quarkonia and open heavy flavor results from cms. The second moment of the heavy quark vector correlator at o. January 26, 2005 charm and bottom quark rescattering in a quark gluon plasma qgp is investigated with the objective of assessing the approach toward thermalization. Presentation mode open print download current view. Pdf we examine the origin of possible failures of the quark hadron local duality. The next logical step was the observation of the heavy quark symmetry 4, 5, 6. The diffusion of heavy quarks in qcd matter at not too high. Using heavy quark fragmentation into heavy hadrons to.
Heavy quark photoproduction in ultraperipheral heavy ion. Pdf inmedium operator product expansion for heavylight. Heavy quark physics cambridge monographs on particle. Muoncontribution to the electrons magnetic moment heavy sea quark contribution to the protons magnetic moment implications for the physical strange quark. The stop squark is a key ingredient of a wide range of susy. Remarks on the heavyquark flavour symmetry for doubly.
Pdf the present status of the heavyquark production theory is critically. There is almost no difference between current quark mass and constituent quark mass for the heavy quarks c,b,t. Qq in contrast, in the variable flavor number scheme vfns, the heavy quark is included as a parton in the pdf at scales above the m m matching scale. Master thesis beauty of the quark gluon plasma prospect for b0.
Techniques for heavy quarks hqet heavy quark e ective theory. We study the variation of the matching scales, and their impact on a global pdf fit of the. The current quark mass is a logical consequence of the mathematical. Heavy quarks q, for present purposes will be c,b,t with masses mq. Pdf the second moment of the heavy quark vector correlator at o. Introduction in these lectures i hope to giveyouan introduction to. Hqet, as we will see, is an expansion of the qcd action in inverse powers of the heavy quark mass. This heavy quark symmetry leads to similar predictions than chi ral symmetry. Heavyquark parton distribution functions and their. Heavy quark physics provides an exciting introduction to this new area of high energy physics. The current quark mass means the mass of the constituent quark mass reduced by the mass of the respective constituent quark covering. Higherorder corrections to heavyquark jet quenching. Impact of the heavyquark matching scales in pdf fits. Pdf on measuring the kinetic energy of the heavy quark.
Thermalization of heavy quarks in the quarkgluon plasma. Pdf we analyze the largedistance behaviour of static quark anti quark pair correlations in qcd. Sea quark contribution to the protons magnetic moment light and heavy quark limits warmup. It is a sfermion, which means it is a spin0 boson scalar boson.
Other parameters such as the heavy quark mass, or, when it comes to the complete prediction of realistic final states, fragmentation fractions to. In quantum chromodynamics, heavy quark effective theory hqet is an effective field theory describing the physics of heavy that is, of mass far greater than the qcd scale quarks. It is used in studying the properties of hadrons containing a single charm or bottom quark. Extraction of heavyflavor transport coefficients in qcd matter. A quark k w r k, k w r k is a type of elementary particle and a fundamental constituent of matter. Are technicolor models compatible with a very heavy top quark. Yenjie lee mit heavy quark physics in heavy ion collisions 2 trying to answer two fundamental questions in the high density qcd. We can describe the full kinematic range from low to high this is the essence of the acot renormalization scheme dis production of heavy quarks acot, prd 50, 3102. An introduction to the quark model university of regina. Therefore, the next logical level means considering. As a logical consequence, also the y correlation is more narrow. Heavy quark production in this chapter a brief overview of the theoretical and experimental knowledge of heavy quark production is given. Pdf the second physical moment of the heavy quark vector.
Heavy quark production in photonnucleon and photonphoton. This includes the interactions that bind the heavy quark with other light partons inside heavy mesons and baryons. A higher order perturbative parton evolution toolkit hoppet. Heavy quark photoproduction in ultraperipheral heavy ion collisions. Bottom quark physics and the heavy quark expansion michael luke department of physics university of toronto 60 st.
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