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Nuclear Theory·nucl-th

Tuesday·September 20, 2016

13 papers—9 primary·4 cross-listed

All13Primary9Cross-lists4
  1. 10

    [Submitted on 18 Sept 2016] (cross-list from hep-ph)

    Theory of hard probes in PbPb collisions

    Yang-Ting Chien🇺🇸

    The jet quenching phenomenon in heavy ion collisions provides a strong evidence of the modification of parton shower in the quark-gluon plasma. This contribution focuses on the hard probes of QGP using jets and summarizes the new theoretical progress of jet substructure modification studies using effective field theory techniques. We emphasize the important role of jet substructure observables as they probe various aspects of the jet formation mechanism and allow us to study the medium properties in great details. The precise calculations require the systematic resummation and consistently including medium modifications. Specifically, we discuss the calculations of jet shapes and cross sections in proton-proton and lead-lead collisions at the LHC using soft-collinear effective theory, with Glauber gluon interactions in the medium. In the end we present the comparison between our calculations and the recent measurements at the LHC with very good agreement. We conclude that precise jet modification studies in heavy ion collisions has been initiated.

    Comments:
    10 pages, 8 figures. Talk presented at Fourth Annual Large Hadron Collider Physics conference (LHCP2016), 13-18 June 2016, Lund, Sweden
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1609.05441 [pdf]
    PoS(2016)·0 citations
  2. 11

    [Submitted on 19 Sept 2016] (cross-list from hep-ph)

    Mini-Proceedings, 18th meeting of the Working Group on Radiative Corrections and MC Generators for Low Energies

    H. Czyż · S. Eidelman · F. Ignatov · A. Keshavarzi · A. Kupsc · V. E. Lyubovitskij · P. Masjuan · A. Nyffeler · G. Pancheri · E. Tomasi-Gustafsson · G. Venanzoni

    The mini-proceedings of the 18 Meeting of the "Working Group on Radiative Corrections and MonteCarlo Generators for Low Energies" held in Frascati, 19 - 20 May, are presented. These meetings, started in 2006, have as aim to bring together experimentalists and theoreticians working in the fields of meson transition form factors, hadronic contributions to the anomalous magnetic moment of the leptons, and the effective fine structure constant. The development of MonteCarlo generators and Radiative Corrections for precision and -lepton physics are also covered, with emphasis on meson production. At this workshop, a documentary entitled {\it Bruno Touschek with AdA in Orsay} commemorating the first observation of electron-positron collisions in a laboratory was also presented. With this edition, the working group reaches 10 years of continuous activities.

    Comments:
    27 pages, 10 contributions. Editors: H. Czyz, P. Masjuan, and G. Venanzoni
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1609.05651 [pdf]
    0 citations
  3. 12

    [Submitted on 19 Sept 2016] (cross-list from hep-ph)

    Properties of vector mesons in four pseudoscalars electroproduction

    G. Toledo Sanchez🇲🇽

    Vector mesons and the gauge boson share some common features, such as the spin and a very short lifetime. The electromagnetic properties of the are linked to its gauge nature and thus a big effort has been devoted to measure them, while accounting for its instability. In this work, we elaborate on how these ideas can be translated to study vector mesons. We focus in the unstable property of such states and the restrictions from electromagnetic gauge invariance, describing the differences and similarities. Then, we describe the four pseudoscalars electroproduction as an analog to the process, used to study the electromagnetic properties of the boson. We point out that the current experimental capabilities are reaching the possibility to measure the magnetic dipole moment of light vector mesons.

    Comments:
    To be published in Journal of Physics Conference Series (IOP). Joint Proceedings of the XV Mexican Workshop on Particles and Fields & the XXX Annual Meeting of the Division of Particles and Fields of the Mexican Physical Society
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1609.05746 [pdf]
    J.Phys.Conf.Ser.(2016)·0 citations
  4. 13

    [Submitted on 19 Sept 2016] (cross-list from hep-ph)

    Angular Structure of Jet Quenching Within a Hybrid Strong/Weak Coupling Model

    Jorge Casalderrey-Solana🇬🇧 · Doga Gulhan🇨🇭 · Guilherme Milhano🇵🇹 · Daniel Pablos🇪🇸 · Krishna Rajagopal🇺🇸

    Within the context of a hybrid strong/weak coupling model of jet quenching, we study the modification of the angular distribution of the energy within jets in heavy ion collisions, as partons within jet showers lose energy and get kicked as they traverse the strongly coupled plasma produced in the collision. To describe the dynamics transverse to the jet axis, we add the effects of transverse momentum broadening into our hybrid construction, introducing a parameter that governs its magnitude. We show that, because of the quenching of the energy of partons within a jet, even when the jets that survive with some specified energy in the final state are narrower than jets with that energy in proton-proton collisions. For this reason, many standard observables are rather insensitive to . We propose a new differential jet shape ratio observable in which the effects of transverse momentum broadening are apparent. We also analyze the response of the medium to the passage of the jet through it, noting that the momentum lost by the jet appears as the momentum of a wake in the medium. After freezeout this wake becomes soft particles with a broad angular distribution but with net momentum in the jet direction. We show that the particles coming from the response of the medium to the momentum and energy deposited in it leads to a correlation between the momentum of soft particles well separated from the jet in angle with the direction of the jet momentum, and find qualitative but not quantitative agreement with experimental data on observables designed to extract such a correlation. By confronting the results that we obtain upon introducing transverse momentum broadening and the response of the medium to the jet with available jet data, we highlight the importance of these processes for understanding the internal, soft, angular structure of high energy jets.

    Comments:
    62 pages, 14 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1609.05842 [pdf]
    JHEP(2017)·203 citations

Affiliations

first authorsco-authorsvia INSPIRE