1,738,557 research outputs found
D (sJ) (2317) meson production at RHIC
No full textWe study the production of D (sJ) (2317) mesons in relativistic heavy ion collisions using the quark coalescence model. The predicted D (sJ) (2317) abundance depends sensitively on the quark structure of the D (sJ) (2317) meson. We have also evaluated the absorption cross sections of the D (sJ) (2317) meson by pi, rho, kaon and K* in a phenomenological hadronic model. We find that the final yield of D (sJ) (2317) mesons remains sensitive to its initial number produced from the quark-gluon plasma, providing thus the possibility of studying the quark structure of the D (sJ) (2317) meson and its production mechanism in relativistic heavy ion collisions
New York Central (NYC) 2317
No full textA photograph print showing the New York Central (NYC) 2317, 2-8-2 (class H-10A), Dayton, OH
BIT 2317 Fundamentals of Computer Security Exam
No full textBIT 2317 Fundamentals of Computer Security Exa
Measurements of B D D*+s0(2317) decay rates and a search for isospin partners of the D*+s0(2317)
No full textWe report improved measurements of the product branching fractions and , where the first errors are statistical, the second are systematic and the third are from and branching fractions. In addition, we report negative results from a search for hypothesized neutral () and doubly charged () isospin partners of the and provide upper limits on the product branching fractions and that are more than an order of magnitude smaller than theoretical expectations for the hypotheses that the is a member of an isospin triplet. The analysis uses a 711 data sample containing 772 million -meson pairs collected at the resonance in the Belle detector at the KEKB collider
Measurements of B -> (D)over-barDs0*(+)(2317) decay rates and a search for isospin partners of the Ds0*(+)(2317)
No full textWe report improved measurements of the product branching fractions B(B+ --> (D) over bar D-0(s0)*(+)(2317)) x B(D-s0*(+)(2317) --> D-s(+) pi(0)) (8.0(-1.2)(+1.3) +/- 1.1 +/- 0.4) x 10(-4) and B(B-0 --> D-Ds0*(+)(2317)) x B(D-s0*(+)(2317)) --> D-s(+) pi(0)) = (10.2(-1.2)(+1.3) +/- 1.0 +/- 0.4) x 10(-4) where the first errors are statistical, the second are systematic and the third are from D and D-s(+) branching fractions. In addition, we report negative results from a search for hypothesized neutral (z(0)) and doubly charged (z(++)) isospin partners of the D-s0*(+)(2317) and provide upper limits on the product branching fractions B(B-0 --> D(0)z(0)) x B(z(0) --> D-s(+)pi(-)) and B(B+ --> D(0)z(++) ) x B(z(++) --> D-s(+)pi(+)) that are more than an order of magnitude smaller than theoretical expectations for the hypotheses that the D-s0(*+)(2317) is a member of an isospin triplet. The analysis uses a 711 fb(-1) data sample containing 772 million B (B) over bar -meson pairs collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider.9711Nsciescopu
DsJ+(2317)→Ds+π0 decay width
No full textAbstractWe use the QCD sum rules to analize the hadronic decay DsJ+(2317)→Ds+π0, in the hypothesis that the DsJ+(2317) can be identified as a four-quark state. We use a diquark–antidiquark current and work to the order of ms in full QCD, without relying on 1/mc expansion. We find that the partial decay width of the hadronic isospin violating mode is proportional to the isovector quark condensate, 〈0|d¯d−u¯u|0〉. The estimated partial decay width is of the order of 6 keV
Subleading contributions to the width of the D*(s0)(2317)
Get PDFWe construct the effective chiral Lagrangian involving the D-mesons and Goldstone bosons at next-to-leading order taking into account strong as well as electromagnetic interactions. This allows us to disentangle-to leading order in isospin violation-the electromagnetic and the strong contribution to the D-meson mass differences. In addition, we also apply the interaction to the decay D-s0*(2317) -> D-s pi(0) under the assumption that the D-s0* (2317) is a hadronic molecule. We find (180 +/- 110) keV for the decay width Gamma(D-s0*(2317) -> D-s pi(0))-consistent with currently existing experimental constraints as well as previous theoretical investigations. The result provides further evidence that this decay width can serve as a criterion for testing the nature of the D-s0*(2317). (C) 2008 Elsevier B.V. All rights reserved
Observation of the radiative decay
No full textWe observe the radiative decay for the first time, with a significance exceeding standard deviations. The signal is found in the continuum process with the combined data samples of 980.4~ and 427.9~ collected by the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy colliders, respectively. The branching fraction ratio is measured to be . This result provides significant new experimental input for the determination of the quark structure of the , which remains unknown
Contribution of constituent quark model cs¯ states to the dynamics of the Ds0∗(2317) and Ds1(2460) resonances
No full textAbstract The masses of the Ds0∗(2317) and Ds1(2460) resonances lie below the DK and D∗K thresholds respectively, which contradicts the predictions of naive quark models and points out to non-negligible effects of the D(∗)K loops in the dynamics of the even-parity scalar ( Jπ=0+ ) and axial-vector ( Jπ=1+ ) cs¯ systems. Recent lattice QCD studies, incorporating the effects of the D(∗)K channels, analyzed these spin-parity sectors and correctly described the Ds0∗(2317)-Ds1(2460) mass splitting. Motivated by such works, we study the structure of the Ds0∗(2317) and Ds1(2460) resonances in the framework of an effective field theory consistent with heavy quark spin symmetry, and that incorporates the interplay between D(∗)K meson–meson degrees of freedom and bare P-wave cs¯ states predicted by constituent quark models. We extend the scheme to finite volumes and fit the strength of the coupling between both types of degrees of freedom to the available lattice levels, which we successfully describe. We finally estimate the size of the D(∗)K two-meson components in the Ds0∗(2317) and Ds1(2460) resonances, and we conclude that these states have a predominantly hadronic-molecular structure, and that it should not be tried to accommodate these mesons within cs¯ constituent quark model patterns
Understanding DsJ(2317)
No full textAbstractWe analyze the hadronic and radiative decay modes of the recently observed DsJ(2317) meson, in the hypothesis that it can be identified with the scalar sℓP=12+ state of cs̄ spectrum (Ds0). The method is based on heavy quark symmetries and vector meson dominance ansatz. We find that the hadronic isospin violating mode Ds0→Dsπ0 is enhanced with respect to the radiative mode Ds0→Ds∗γ. The estimated width of the meson is Γ(Ds0)≃7 keV
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