4,020 research outputs found
More hidden heavy quarkonium molecules and their discovery decay modes
To validate the molecular description of the observed
and , it is valuable to investigate their counterparts,
denoted as in this work, and the corresponding decay modes.
In this work, we present an analysis of the using flavor
symmetry. We also use the effective Lagrangian based on the heavy quark
symmetry to explore the rescattering mechanism and calculate the partial widths
for the isospin conserved channels . The
predicted partial widths are of an order of MeV for ,
which correspond to branching ratios of the order of . For
, the partial widths are a few hundreds of keV and
the branching ratios are about . Future experimental measurements can
test our predictions on the partial widths and thus examine the molecule
description of heavy quarkoniumlike exotic states.Comment: 11 pages, 2 figures; accepted by Phys. Rev.
Strong decays of the states
Through the spin rearrangement scheme in the heavy quark limit, we have
performed a comprehensive investigation of the decay pattern and production
mechanism of the hidden beauty di-meson states, which are either composed of a
P-wave bottom meson and an S-wave bottom meson or two S-wave bottom mesons. We
further extend the corresponding formula to discuss the decay behavior of some
charmonium-like states by combining the experimental information with our
numerical results. The typical ratios presented in this work can be measured by
future experiments like BESIII, Belle, LHCb and the forthcoming BelleII, which
shall provide important clues to the inner structures of the exotic states.Comment: 21pages, 12table
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Precision QCD Event Shapes at Hadron Colliders: The Transverse Energy-Energy Correlator in the Back-to-Back Limit.
We present an operator-based factorization formula for the transverse energy-energy correlator (TEEC) hadron collider event shape in the back-to-back (dijet) limit. This factorization formula exhibits a remarkably symmetric form, being a projection onto a scattering plane of a more standard transverse momentum dependent factorization. Soft radiation is incorporated through a dijet soft function, which can be elegantly obtained to next-to-next-to-leading order (NNLO) due to the symmetries of the problem. We present numerical results for the TEEC resummed to next-to-next-to-leading logarithm (NNLL) matched to fixed order at the LHC. Our results constitute the first NNLL resummation for a dijet event shape observable at a hadron collider, and the first analytic result for a hadron collider dijet soft function at NNLO. We anticipate that the theoretical simplicity of the TEEC observable will make it indispensable for precision studies of QCD at the LHC, and as a playground for theoretical studies of factorization and its violation
Top quark pair production at small transverse momentum in hadronic collisions
We investigate the transverse momentum resummation for top quark pair
production at hadron colliders using the soft-collinear effective theory and
the heavy-quark effective theory. We derive the factorization formula for
production at small pair transverse momentum, and show in detail the
procedure for calculating the key ingredient of the factorization formula: the
next-to-leading order soft functions. We compare our numerical results with
experimental data and find that they are consistent within theoretical and
experimental uncertainties. To verify the correctness of our resummation
formula, we expand it to the next-to-leading order and the
next-to-next-to-leading order, and compare those expressions with the exact
fixed-order results numerically. Finally, using the results of transverse
momentum resummation, we discuss the transverse-momentum-dependent
forward-backward asymmetry at the Tevatron.Comment: 39 pages, 7 figures, 1 table; final version in PR
Toward Understanding Sellers\u27 Choice of Starting Price Strategies: An Experimental Approach
This paper seeks to explain the eBay-Yahoo! Auction phenomenon: while eBay charged sellers a listing fee and a percentage commission and Yahoo! Auction charged no fees at all, Yahoo! Auction, however, had a significantly lower sold-out rate than eBay, and eBay continued to dominate the C2C auction category. We combine three theoretical perspectives - the economic, the psychological and the marketing perspectives to develop our research framework and hypothesis for a fuller understanding of such a puzzle, and try to bridge the great gap between the real world and the theoretical world. A controlled experiment that took into account interactive effects of chances, payoffs, and costs was used to check subjects’ choice of the starting-price strategy in the simulated online auction market environment. We have three major findings. First, subjects generally gave more weight on transaction chance than listing fee and payoff. Second, at the website with high cost incurred, subjects could choose a median starting-price strategy, seeking a higher payoff. Third, subjects did not show strong preference to choose a high starting-price strategy at the website with no cost incurred
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