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Hydrodynamic description of d meson production in high-energy heavy-ion collisions

Chinese Physics C 2021年第7期45卷 205-213页

作者： Chi ding Wei-Yao Ke Long-Gang Pang Xin-Nian Wang Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Physics department University of CaliforniaBerkeleyCA 94720USA Nuclear Science division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

The large values and constituent-quark-number scaling of the elliptic flow of low-pT d mesons imply that charm quarks,initially produced through hard processes,might be partially thermalized through strong interactions with quark-gluon plasma(QGP)in high-energy heavy-ion *** quantify the degree of thermalization of low-pT charm quarks,we compare the d^(0)meson spectra and elliptic flow from a hydrodynamic model to experimental data as well as transport model *** use an effective charm chemical potential at the freeze-out temperature to account for the initial charm quark production from hard processes and assume that they are thermalized in the local comoving frame of the medium before freeze-out.d^(0)mesons are sampled statistically from the freeze-out hyper-surface of the expanding QGP as described by the event-by-event(3+1)d viscous hydrodynamic model *** the hydrodynamic and transport models can describe the elliptic flow of d^(0)mesons at pT~3 GeV/c as measured in Au+Au collisions at√SNN=200 *** the experimental data on d^(0)spectra are consistent with the hydrodynamic result at small pT~1 GeV/c,they deviate from the hydrodynamic model at high transverse momentum,pT~2 GeV/*** diffusion and parton energy loss mechanisms in the transport model can describe the measured spectra reasonably well within the theoretical *** comparative study indicates that charm quarks only approach local thermal equilibrium at small pT,even though they acquire sizable elliptic flow comparable to light-quark hadrons at both small and intermediate pT.

关键词： d meson relativistic hydrodynamics heavy ion collisions heavy flavor thermalization

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Looking for new physics via semi-leptonic and leptonic rare decays of d and ds

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Chinese Physics C 2017年第9期41卷 59-69页

作者：郭星导郝喜庆柯红卫赵明刚李学潜 School of Physics and Math Xuzhou University of Technology department of Physics Nankai University Physics department Henan Normal University School of Science Tianjin University

It is well recognized that looking for new physics at lower energy colliders is a path wnmn is complemen- tary to high energy machines such as the LHC. Using the large volume of data collected by BESIII, we may have a unique opportunity to tackle this. In this paper we calculate the branching ratios of the semi-leptonic processes d＋ → K＋e-e＋ and d＋ → K＋e-P-＋, and the leptonic processes d0→ e-e＋ and d0→ e-μ＋, in the frameworks of the U（1） model, 2HdM and unparticle model. It is found that both the U（1） model and 2HdM may influence the semi-leptonic decay rates, but only the U（1） model offers substantial contributions to the pure leptonic decays, and the resultant branching ratio of dO → e- μ＋ can be as large as 10-7 - 10-8. This might be observed at the future super τ-charm factory.

关键词： rare decay d meson LFV

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Pure annihilation type d→PP(V) decays in the perturbative QCd approach

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Chinese Physics C 2013年第9期37卷 1-5页

作者：邹芝田李承吕才典 Institute of High Energy Physics and Theoretical Physics Center for Science Facilities Chinese Academy of Sciences

The annihilation type diagrams are difficult to calculate in any kind of model or method. Encouraged by the successful calculation of pure annihilation type B decays in the perturbative QCd factorization approach, we calculate the pure annihilation type d→ PP（V） decays in the perturbative QCd approach based on the kw factorization. Although the expansion parameter 1lind is not very small, our leading order numerical results agree with the existing experimental data for most channels. We expect more accurate observation from experiments, which can help us learn about the dynamics of d meson weak decays.

关键词： d meson perturbative QCd annihilation

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Recent results from the KEdR detector

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Chinese Physics C 2010年第6期34卷 650-655页

作者： V.V.Anashin V.M.Aulchenko E.M.Baldin A.K.Barladyan A.Yu.Barnyakov M.Yu.Barnyakov S.E.Baru I.V.Bedny O.L.Beloborodova A.E.Blinov V.E.Blinov A.V.Bobrov V.S.Bobrovnikov A.V.Bogomyagkov A.E.Bondar A.R.Buzykaev S.I.Eidelman Yu.M.Glukhovchenko V.V.Gulevich d.V.Gusev S.E.Karnaev S.V.Karpov T.A.Kharlamova V.A.Kiselev S.A.Kononov K.Yu.Kotov E.A.Kravchenko V.F.Kulikov G.Ya.Kurkin E.A.Kuper E.B.Levichev d.A.Maksimov V.M.Malyshev A.L.Maslennikov A.S.Medvedko O.I.Meshkov S.I.Mishnev I.I.Morozov N.Yu.Muchnoi V.V.Neufeld S.A.Nikitin I.B.Nikolaev I.N.Okunev A.P.Onuchin S.B.Oreshkin I.O.Orlov A.A.Osipov S.V.Peleganchuk S.G.Pivovarov P.A.Piminov V.V.Petrov A.O.Poluektov I.N.Popkov V.G.Prisekin A.A.Ruban V.K.Sandyrev G.A.Savinov A.G.Shamov d.N.Shatilov B.A.Shwartz E.A.Simonov S.V.Sinyatkin Yu.I.Skovpen A.N.Skrinsky V.V.Smaluk A.V.Sokolov A.M.Sukharev E.V.Starostina A.A.Talyshev V.A.Tayursky V.I.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.M.Tumaikin Yu.V.Usov A.I.Vorobiov A.N.Yushkov V.N.Zhilich V.V.Zhulanov A.N.Zhuravlev Budker Institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University 20Karl Marx prospectNovosibirsk630092Russia

We report results of experiments performed with the KEdR detector at the VEPP-4M e^＋e^- collider. They include precise measurement of the d^0 and d^± meson masses, determination of the ψ（3770） resonance parameter... 详细信息

关键词： d meson ψ(3770) mass narrow resonances

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