1,725,949 research outputs found
The multiplicity in heavy-ion collisions
Get PDFIn a previous work we computed the thermally-averaged cross sections for the
production and absorption of the state in the hot hadron gas
formed in heavy ion collisions. In the present work we estimate the final yield
of this exotic state in these collisions. We use the coalescence model to fix
the initial multiplicities. The state is is treated as a wave bound state
of and also as a compact tetraquark. The Bjorken picture is
used to model the hydrodynamic expansion and cooling. Then, the kinetic
equation is solved to evaluate the time evolution of the
yield during the hot hadron gas phase. Since the decay width
is large it might decay inside the hadron gas. Therefore we also include the
decay and regeneration terms by means of an effective
coupling, estimated from the available data. The combined effects of hadronic
interactions and the decay have a strong impact on the final
yield. Also, predictions of the multiplicity as a function of
centrality and of the charged hadron multiplicity (measured at midrapidity) are
presented. Finally, we calculate the yield of a proposed wave molecular
state of , , characterized by a smaller
width and smaller coupling constant obtained from the Weinberg compositeness
condition.Comment: 7 pages, 5 figure
Probing an axial-vector tetraquark Z(s) via its semileptonic decay Z(s) -> X(4274)(I)over-bar nu(I)
No full textAzizi, Kazem (Dogus Author)The semileptonic decays of the open charm-bottom axial-vector tetraquark Z(s) = [cs][(b) over bar(s) over bar] to X(4274) (l) over bar nu(l) = e, mu, tau are explored by means of the QCD three-point sum rule method. Both Z(s) and X(4274) = [cs][(cs) over bar] are treated as color sextet diquark-antidiquark states. The full width of the decays Z(s) -> X(4274) (l) over bar nu(l) is found. Obtained predictions for Gamma(Z(s) -> X(4274)(l) over bar nu(l)) demonstrate that, as in the case of the conventional hadrons, the semileptonic transitions form a very small part of its full width
Exploring the resonances X(4140) and X(4274) through their decay channels
Get PDFAzizi, Kazem (Doğuş Author)Investigation of the resonances X(4140) and X(4274), which were recently confirmed by the LHCb Collaboration [1], is carried out by treating them as the color triplet and sextet [cs] [(c) over bar (s) over bar] diquark-antidiquark states with the spin-parity J(P) = 1(+), respectively. We calculate the masses and meson-current couplings of these tetraquarks in the context of the QCD two-point sum rule method by taking into account the quark, gluon, and mixed vacuum condensates up to eight dimensions. We also study the vertices X(4140)J/psi phi and X(4274)J/psi phi and evaluate corresponding strong couplings g(X(4140)J/psi phi) and g(X(4274)J/psi phi) by means of the QCD light-cone sum rule method and a technique of the soft-meson approximation. In turn, these couplings contain required information to determine the width of the X(4140) -> J/psi phi and X(4274) -> J/psi phi decay channels. We compare our results for the masses and decay widths of the X(4140) and X(4274) resonances with the LHCb data and alternative theoretical predictions
Block Card 4274 Miramar Drive
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: 4274 Miramar Drive (Toledo, Ohio) | Heatherwoods (Toledo, Ohio) | South Toledo Area (Toledo, Ohio) | Ranch houses | Dwellin
Interactions of the state with light mesons
Get PDFWe investigate the interactions of the state with light mesons in the hot hadron gas formed in heavy ion collisions. The vacuum and thermally-averaged cross sections of production of accompanied by light pseudoscalar and light vector mesons as well as the corresponding inverse processes are estimated within the context of an effective Lagrangian approach. The results suggest non-negligible thermal cross-sections, with larger magnitudes for most of the suppression reactions than those for production. This might be a relevant feature to be considered in the analysis of future data collected in heavy ion collisions.9 pages, 6 figure
How to understand the underlying structures of X(4140), X(4274), X(4500) and X(4700)
No full textWe investigate the possible rescattering effects which may contribute to the process B+→J/ψϕK+. It is shown that the ψ′ϕ rescattering via the ψ′K1 loop can simulate the structure of X(4700). The cusp effect due to the Ds⁎+Ds− rescattering may possibly simulate the X(4140) structure, but it depends on the cusp model parameters. If the quantum numbers of X(4274) (X(4500)) are 1++ (0++), it is hard to ascribe the observation of X(4274) and X(4500) to the P-wave threshold rescattering effects, which implies that X(4274) and X(4500) could be genuine resonances. We also suggest that X(4274) may be the conventional orbitally excited state χc1(3P)
Linked collectors and determiners for: Bryophyte collection of Porto Herbarium (PO).
No full textNatural history specimen data linked to collectors and determiners held within, "Bryophyte collection of Porto Herbarium (PO)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/677f03d8-8229-4274-9e6f-9f1078369c0b">https://bionomia.net/dataset/677f03d8-8229-4274-9e6f-9f1078369c0b</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/677f03d8-8229-4274-9e6f-9f1078369c0b">https://gbif.org/dataset/677f03d8-8229-4274-9e6f-9f1078369c0b</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: A synopsis of Meriania (Melastomataceae: Merianieae) in Peru.
No full textNatural history specimen data linked to collectors and determiners held within, "A synopsis of Meriania (Melastomataceae: Merianieae) in Peru". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/ffb8865d-6e03-4274-b709-21b7cb9f94d8">https://bionomia.net/dataset/ffb8865d-6e03-4274-b709-21b7cb9f94d8</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/ffb8865d-6e03-4274-b709-21b7cb9f94d8">https://gbif.org/dataset/ffb8865d-6e03-4274-b709-21b7cb9f94d8</a>. Formatted as a Frictionless Data package
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