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Nuclear Theory·nucl-th

Monday·February 20, 2017

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 17 Feb 2017] (cross-list from hep-ph)

    Azimuthal flow in hadron collisions from quark-gluon string repulsion

    Igor Altsybeev🇷🇺 · Grigory Feofilov🇷🇺

    Color flux tubes (quark-gluon strings), formed at early stages of hadron-hadron collisions, may overlap in case of sufficiently high densities and interact, producing long-range azimuthal correlations. In the hypothesis of repulsive interaction, each string may acquire, before the hadronization, the additional transverse boost, which is an efficient sum of all accounted string-string interactions. This modifies transverse momenta to the particles formed in string decay, leading to modification of event-wise observables, like azimuthal asymmetry of two-particle correlations, over a wide range of rapidity. In this article we discuss results of Monte Carlo model with string repulsion, where efficient string-string interaction radius is introduced. We show that the effect of string repulsion can be the main dynamic origin of the elliptic flow and of the higher harmonics, which are reflected in the complicated structures observed in two-particle long-range correlation topology in nucleus-nucleus collisions at RHIC and at LHC.

    Comments:
    9 pages, http://dx.doi.org/10.1051/epjconf/201612504011
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1702.05281 [pdf]
    EPJ Web Conf.(2016)·3 citations
  2. 05

    [Submitted on 17 Feb 2017] (cross-list from hep-ph)

    Tensor-polarized structure function in the standard convolution description of the deuteron

    W. Cosyn🇧🇪 · Yu-Bing Dong🇨🇳 · S. Kumano🇯🇵 · M. Sargsian🇺🇸

    Tensor-polarized structure functions of a spin-1 hadron are additional observables which do not exist for the spin-1/2 nucleon. They could probe novel aspects of the internal hadron structure. Twist-2 tensor-polarized structure functions are and , and they are related by the Callan-Gross-like relation in the Bjorken scaling limit. In this work, we theoretically calculate in the standard convolution description for the deuteron. Two different theoretical models, a basic convolution description and a virtual nucleon approximation, are used for calculating and their results are compared with the HERMES measurement. We found large differences between our theoretical results and the data. Although there is still room to improve by considering higher-twist effects and in the experimental extraction of from the spin asymmetry , there is a possibility that the large differences require physics beyond the standard deuteron model for their interpretation. Future studies could shed light on a new field of hadron physics. In particular, detailed experimental studies of will start soon at the Thomas Jefferson National Accelerator Facility. In addition, there are possibilities to investigate tensor-polarized parton distribution functions and at Fermi National Accelerator Laboratory and a future electron-ion collider. Therefore, further theoretical studies are needed for understanding the tensor structure of the spin-1 deuteron, including a new mechanism to explain the large differences between the current data and our theoretical results.

    Comments:
    12 pages, 7 eps figures, 3 style files, typos are corrected as published in Phys. Rev. D 95, 074036 (2017)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1702.05337 [pdf]
    PRD(2017)·48 citations
  3. 06

    [Submitted on 17 Feb 2017] (cross-list from hep-ph)

    Parton correlations in same-sign pair production via double parton scattering at the LHC

    Federico Alberto Ceccopieri🇮🇹 · Matteo Rinaldi🇪🇸 · Sergio Scopetta🇮🇹

    Same-sign boson pairs production is a promising channel to look for signatures of double parton interactions at the LHC. The corresponding cross section has been calculated by using double parton distribution functions, encoding two parton correlations, evaluated in a Light-Front quark model. The obtained result is in line with previous estimates which make use of an external parameter, the so called effective cross section, not necessary in our approach. The possibility to observe for the first time two-parton correlations, in the next LHC runs, has been established.

    Comments:
    5 pages, 3 figures, 3 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1702.05363 [pdf]
    PRD(2017)·46 citations
  4. 07

    [Submitted on 17 Feb 2017] (cross-list from nucl-ex)

    Study of the proton-proton collisions at 1683 MeV/c

    K.N. Ermakov🇷🇺 · V.A. Nikonov🇷🇺 · O.V. Rogachevsky🇷🇺 · A.V. Sarantsev🇷🇺 · V.V. Sarantsev🇷🇺 · S.G. Sherman🇷🇺

    The new data on the elastic and single pion production reaction taken at the incident proton momentum 1683 MeV/c are presented. The data on the reaction are compared with predictions from the OPE model. To extract contributions of the leading partial waves the single pion production data are analyzed in the framework of the event-by-event maximum likelihood method together with the data measured earlier. The analysis allows us to obtain the assessment with a better precision the contributions from different initial partial waves.

    Comments:
    7 pages, 6 figures. Some corrections are made
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1702.05385 [pdf]
    EPJA(2017)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE