Couplings of pions with heavy baryons from light-cone QCD sum rules in the leading order of HQET
TL;DR: In this paper, the couplings of pions with heavy baryons were studied with light-cone QCD sum rules in the leading order of heavy quark effective theory, and the results are g(2)= 1.56+/-0.3, g(3) = 0.94 +/- 0.2.
About: This article is published in Physics Letters B.The article was published on 1998-06-11 and is currently open access. It has received 6 citations till now. The article focuses on the topics: QCD sum rules & Pion.
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TL;DR: In this article, the exclusive semileptonic heavy baryon decay was investigated using light-cone sum rule method in both full QCD and HQET and the decay width and differential distribution were predicted.
Abstract: The exclusive semileptonic heavy baryon decay \Lambda_b\to p l\bar
u is investigated using light-cone sum rule method in both full QCD and HQET. The form factors describing the decay are calculated and used to predict the decay width and differential distribution. The total decay width obtained from full QCD is in agreement with the previous theoretical predictions while the HQET result are typically one order smaller. Both results are consistent with the experimental upper limit and can be compared to the refined experimental data in the future.
38 citations
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TL;DR: In this paper, the effects of relativistic effects in the parameters of the quark-quark potentials of mesons with one and two heavy quarks have been investigated.
Abstract: This thesis has been devoted to the study of different properties of hadrons with one and two heavy quarks $c$ and/or $b$ All calculations have been done in the framework of a nonrelativistic constituent quark model In order to check the sensitivity of our results to the inter--quark interaction we have used five different quark--quark potentials The spread in results gives an estimation of theoretical uncertainties and so has been quoted
Most observables studied change only at the level of a few per cent when changing the interaction potential
Another source of theoretical uncertainty is the use of nonrelativistic kinematics in the evaluation of the orbital wave functions and the construction of our nonrelativistic states, although we think that a good part of these relativistic effects are contained in an effective way in the parameters of the quark-quark potentials, which were adjusted in the original works to reproduce the experimental spectra of mesons Mesons wave functions have been evaluated using a Numerov algorithm, while for baryons the three body problem has been solved using a variational approach with ansatz wave functions that include simplifications that arise from HQS and HQSS To compute hadron decays we have relied on the impulse approximation, which induces small axial and vector current conservation violations due to binding effects These binding effects, though they affect some of the weak form factors analyzed, have little influence on the decay widths
16 citations
TL;DR: In this article, the strong coupling constants among members of the heavy spin-3/2 baryons containing single heavy quark with light pseudoscalar mesons are calculated in the framework of the light cone QCD sum rules.
12 citations
TL;DR: In this paper, the coupling constants between the D-wave heavy meson doublets (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 28, 30, 31, 32, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56
Abstract: We calculate the {pi}, {rho}, {omega}, and {gamma} coupling constants between the heavy meson doublets (1{sup -},2{sup -}) and (0{sup -},1{sup -})/(0{sup +},1{sup +}) within the framework of the light-cone QCD sum rule at the leading order of heavy quark effective theory. Most of the sum rules are stable with the variations of the Borel parameter and the continuum threshold. Then we calculate the strong and electromagnetic decay widths of the (1{sup -},2{sup -}) D-wave heavy mesons. Their total widths are around several tens of MeV, which is helpful in the future experimental search.
4 citations
TL;DR: In this paper, the lightcone QCD sum rules are employed to calculate the pi NN(1535) coupling g pi nN*, and the two-point correlation function of two nucleon currents sandwiched between the vacuum and the pion state.
Abstract: The lightcone QCD sum rules are employed to calculate the pi NN(1535) coupling g pi NN*. We study the two-point correlation function of two nucleon currents sandwiched between the vacuum and the pion state. The contribution from the excited states and the continuum is subtracted from the double Borel transform with respect to the nucleon and N(1535) momenta, p(1)(2), p(2)(2) = (p - q)(2). Our calculation shows that the pi NN(1535) coupling is strongly suppressed.
3 citations
References
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TL;DR: In this article, the effects of the heavy hadrons with light octet Goldstone bosons are studied in a framework which represents a synthesis of chiral perturbation theory and the heavy quark effective theory.
81 citations
TL;DR: Two methods are used to compute the strong coupling constant of the hadronic widths of the positive parity B and D states and to the chiral loop contribution to the ratio.
Abstract: We compute the strong coupling constant ${\mathit{G}}_{\mathit{B}}^{\mathrm{*}\mathrm{*}}$B\ensuremath{\pi} (${\mathit{G}}_{\mathit{D}}^{\mathrm{*}\mathrm{*}}$D\ensuremath{\pi}), where ${\mathit{B}}^{\mathrm{*}\mathrm{*}}$ (${\mathit{D}}^{\mathrm{*}\mathrm{*}}$) is the ${0}^{+}$ P-wave bq\ifmmode\bar\else\textasciimacron\fi{} (cq\ifmmode\bar\else\textasciimacron\fi{}) state, by QCD sum rules and by light-cone sum rules. The two methods give compatible results in the limit ${\mathit{m}}_{\mathit{Q}}$\ensuremath{\rightarrow}\ensuremath{\infty}, with a rather large value of the coupling constant. We apply the results to the calculation of the hadronic widths of the positive parity B and D states and to the chiral loop contribution to the ratio ${\mathit{f}}_{\mathit{D}\mathit{s}}$/${\mathit{f}}_{\mathit{D}}$.
62 citations
TL;DR: In this paper, the strong coupling constant gP∗Pπ with pseudoscalar and vector heavy mesons was computed using the QCD sum rules approach, based on the evaluation of the time ordered product of currents between the vacuum and the soft pion state.
59 citations
TL;DR: In this article, the couplings and interactions of baryons containing a heavy quark are related by light quark spin-flavor symmetry in the large N limit, and the single pion coupling constant which determines all heavy quarks baryon-pion couplings is equal to the pion coupled constant for light quarks.
55 citations
TL;DR: In this article, the properties of baryons containing one heavy quark are studied in the Skyrme model, where they are treated as bound states of a heavy meson with an SU(2) chiral soliton.
47 citations