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Nuclear Theory·nucl-th

Wednesday·December 14, 2016

13 papers—10 primary·3 cross-listed

All13Primary10Cross-lists3
  1. 11

    [Submitted on 12 Dec 2016] (cross-list from hep-ph)

    An improvement from right-handed currents

    V. Cirigliano🇺🇸 · W. Dekens🇺🇸 · J. de Vries🇳🇱 · E. Mereghetti🇺🇸

    Recent lattice QCD calculations of direct CP violation in decays indicate tension with the experimental results. Assuming this tension to be real, we investigate a possible beyond-the-Standard Model explanation via right-handed charged currents. By using chiral perturbation theory in combination with lattice QCD results, we accurately calculate the modification of induced by right-handed charged currents and extract values of the couplings that are necessary to explain the discrepancy, pointing to a scale around TeV. We find that couplings of this size are not in conflict with constraints from other precision experiments, but next-generation hadronic electric dipole moment searches (such as neutron and Ra) can falsify this scenario. We work out in detail a direct link, based on chiral perturbation theory, between CP violation in the kaon sector and electric dipole moments induced by right-handed currents which can be used in future analyses of left-right symmetric models.

    Comments:
    17 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1612.03914 [pdf]
    PLB(2017)·56 citations
  2. 12

    [Submitted on 13 Dec 2016] (cross-list from hep-ph)

    Dijet Asymmetry in the Resummation Improved Perturbative QCD Approach

    Lin Chen🇨🇳 · Guang-You Qin🇨🇳 · Shu-Yi Wei🇨🇳 · Bo-Wen Xiao🇨🇳 · Han-Zhong Zhang🇨🇳

    We develop the first systematic theoretical approach to dijet asymmetries in hadron-hadron collisions based on the perturbative QCD (pQCD) expansion and the Sudakov resummation formalism. We find that the pQCD calculation at next-to-leading order is indispensable to describe the experimental data, while the Sudakov resummation formalism is vital near the end points where the pQCD expansion fails to converge due to the appearance of large Sudakov logarithms. Utilizing our resummation improved pQCD approach, we obtain good agreement with the most up-to-date fully corrected ATLAS data on dijet asymmetry in collisions. Combining with the BDMPS jet energy loss formalism, we extract the value of jet transport coefficient - for the quark-gluon-plasma created in collisions at 2.76A TeV. This work paves the way for a more complete and deeper understanding of the properties of strongly-coupled QCD medium via the studies of dijet asymmetries in relativistic heavy-ion collisions.

    Comments:
    5 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1612.04202 [pdf]
    PLB(2018)·52 citations
  3. 13

    [Submitted on 13 Dec 2016] (cross-list from hep-ph)

    An equation-of-state-meter of QCD transition from deep learning

    Long-Gang Pang🇩🇪 · Kai Zhou🇩🇪 · Nan Su🇩🇪 · Hannah Petersen🇩🇪 · Horst Stöcker🇩🇪 · Xin-Nian Wang🇺🇸

    Supervised learning with a deep convolutional neural network is used to identify the QCD equation of state (EoS) employed in relativistic hydrodynamic simulations of heavy-ion collisions from the simulated final-state particle spectra . High-level correlations of learned by the neural network act as an effective "EoS-meter" in detecting the nature of the QCD transition. The EoS-meter is model independent and insensitive to other simulation inputs, especially the initial conditions. Thus it provides a powerful direct-connection of heavy-ion collision observables with the bulk properties of QCD.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Machine Learning (cs.LG); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Machine Learning (stat.ML)
    arXiv:
    1612.04262 [pdf]
    Nature Commun.(2018)·191 citations

Affiliations

first authorsco-authorsvia INSPIRE