T. M. Aliev, S. Bilmis, M. Savci
We calculate the mass and residue of the newly observed $Ω_c(3000)$ and $Ω_c(3066)$ states with quantum numbers $J^P = \frac{1}{2}^{-}$ and $\frac{3}{2}^{-}$ within QCD sum rules. Our predictions on masses are in good agreement with the experimental results.
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Using the most general form of the interpolating current for the octet baryons, the magnetic moments of the negative-parity baryons are calculated within the light-cone sum rules. The contributions coming from diagonal transitions of the positive-parity baryons, and also from non-diagonal transition between positive and negative-parity baryons are eliminated by considering the combinations of different sum rules corresponding to the different Lorentz structures. A comparison of our results on magnetic moments of the negative-parity baryons with the other approaches existing in literature is pr…
Some aspects of two recent papers on parity doubling in the hadronic spectrum and its relation to restoration of linearly realized chiral symmetry are critically discussed.
The magnetic moments of the negative parity, spin-1/2 baryons containing single heavy quark are calculated. The pollution that occur from the transitions between positive and negative parity baryons are removed by constructing the sum rules from different Lorentz structures.
The strong coupling constants of the $π$ and $K$ mesons with negative parity octet baryons are estimated within the light cone QCD sum rules. It is observed that all strong coupling constants, similar to the case for the positive parity baryons, can be described in terms of three invariant functions, where two of them correspond to the well known $F$ and $D$ couplings in the $SU(3)_f$ symmetry, and the third function describes the $SU(3)_f$ symmetry violating effects. We compare our predictions on the strong coupling constants of pseudoscalar mesons of negative parity baryons with those corres…
Spin and Parity of $Ξ_{3/2}$ Exotic Baryon from Kaon Scattering
我们计算了在$\bar{K}N \to KΞ_{3/2}$反应中产生$Ξ_{3/2}(1862)$奇异重子的总截面，假定$Ξ_{3/2}$重子的自旋宇称为1/2+，1/2-，3/2+，3/2-.我们证明了反应总截面强烈地依赖于$Ξ_{3/2}$重子的自旋。
Spin and parity of a possible baryon antidecuplet
最近提出的重子反十重态存在的假设可以在强耦合理论中得到再现，在强耦合理论中，一个自旋为1/2的裸重子八重态与一个赝标介子八重态相互作用。当选择适当的F-和D-型Yukawa耦合的混合时，缀饰重子将自己组合成无限个SU（3）多重态，其中基态是自旋1/2重子八重态，第一激发态是自旋3/2重子十重态。然后是自旋为1/2的重子反十重态。光谱的所有状态都有正宇称。如果假设的重子反十重态与强耦合谱中的反十重态一致，则预言该多重态具有正宇称和自旋1/2。
The strong coupling constants of negative parity heavy baryons belonging to a sextet and antitriplet representations of $SU_f(3)$ with light $π$ and $K$ mesons are estimated within the light cone QCD sum rules. It is observed that each class of the sextet-sextet, sextet-antitriplet, and antitriplet-antitriplet transitions can be described by only one corresponding function. The pollutions arising from the positive to positive, positive to negative, and negative to positive parity baryons transitions are eliminated by constructing sum rules for different Lorentz structures. The obtained couplin…
We analyze the photo-production helicity amplitudes for the positive parity excited baryons in the context of the $1/N_c$ expansion of QCD. The results show that sub-leading corrections in $1/N_c$ are important and that, while 1-body effective operators are dominant, there is some evidence for the need of 2-body effects.
The transition form factors responsible for the radiative $Σ_Q \to Λ_Q γ$ and $Ξ_Q^\prime \to Ξγ$ decays of the negative parity baryons are examined within light cone QCD sum rules. The decay widths of the radiative transitions are calculated using the obtained results of the form factors.
The transition magnetic moments between negative parity, spin-1/2 heavy baryons are studied in framework of the light cone QCD sum rules. By constructing the sum rules for different Lorentz structures, the unwanted contributions coming from negative (positive) to positive (negative) parity transitions are removed. It is found that the magnetic moments between neutral negative parity heavy $Ξ_Q^{\prime 0}$ and $Ξ_Q^0$ baryons are very small. Magnetic moments of the $Σ_Q \to Λ_Q$ and $ Ξ_Q^{\prime \pm} \to Ξ_Q^\pm$ transitions are quite large and can be measured in further experiments.
In the framework of diquark model for production we discuss the yields and observation prospects for excited states of doubly heavy baryons at LHC kinematic conditions.
Experiments with $Ω^{\pm}$ baryons moving in a crystal at LHC in addition to EDM measurement open possibility to study electric quadrupole moment, to observe birefringence effect (spin oscillations and spin dichroism) for $Ω^{\pm}$ baryons and to get information about constants describing P-odd, T-odd effects at $Ω^{\pm}$ baryon interactions with electrons and nuclei
The decays of non-strange positive parity excited baryons via emission of a pseudo-scalar meson are studied in the framework of the 1/Nc expansion to order 1/Nc. In particular, the pionic decays of the l=0 Roper baryons and of the l=2 baryons in the mass interval 1680-1950 MeV are analyzed using the available partial decay widths. Decay widths by emission of an eta meson are shown to be suppressed by a factor 1/Nc^2 with respect to the pionic ones.
Protecting the Baryon Asymmetry in Theories with R-parity Violation
我们提出了一个隐藏原始重子不对称性的机制，从相互作用，可以洗出来。它需要引入一个携带重子数的单线态，这个单线态在早期宇宙中处于平衡状态，并且与任何现有的重子不对称性相同。在消除不对称性所需的所有相互作用达到平衡（$T \simeq 10$ TeV）之前，它从标准模型粒子中分裂出来，并在电弱相变之后，但在核合成之前衰变。这种机制可以在模型中保持重子的不对称性：（a）具有$B-L = 0$的模型，例如许多$SU(5)$大统一理论，或（b）具有破坏热平衡相互作用的$B-L$的模型，例如具有破缺的$R$ -宇称的超对称模型。因此，对$R$ -宇称违背算子的宇宙学约束被大大放宽。
We study the evidence for and possible origins of parity doubling among the baryons. First we explore the experimental evidence, finding a significant signal for parity doubling in the non-strange baryons, but little evidence among strange baryons. Next we discuss potential explanations for this phenomenon. Possibilities include suppression of the violation of the flavor singlet axial symmetry ($U(1)_{A}$) of QCD, which is broken by the triangle anomaly and by quark masses. A conventional Wigner-Weyl realization of the $SU(2)_{L}\times SU(2)_{R}$ chiral symmetry would also result in parity dou…
Pentaquarks and Radially Excited Baryons
在这次演讲中，我报告的计算的奇异五夸克和径向激发的低位${1/2}^+$和${3/2}^+$重子的手征孤子模型。
We investigate possibilities for dynamical P-parity violation in dense baryon matter in the framework of effective quark models. Dynamical P-parity violation can appear in models with at least two scalar and two pseudoscalar fields, where both scalar fields are condensed at normal conditions. At special configurations of coupling constants, one of pseudoscalar fields can then also condense at some value of baryon density, the phenomenon results in mixing of the scalar and pseudoscalar physical degrees of freedom, hence, giving rise to P-parity violation. We discuss the implications and possibl…
The strong coupling form factors related to the strong vertices of the positive and negative parity nucleons with the heavy $Λ_{b[c]}[Σ_{b[c]}]$ baryons and heavy $B^*[D^*]$ vector mesons are calculated using a three-point correlation function. Using the values of the form factors at $Q^2=-m^2_{meson}$ we compute the strong coupling constants among the participating particles.
Excited $Λ_Q$ Baryons in the Large $N_c$ Limit
在$N_c$大极限下考虑了受激$Λ_Q$型重子的能谱。在大$N_c$极限下计算了$Λ_b$半轻子衰变到激发态粲重子的普适形状因子。我们发现，Bjorken求和规则（Isgur-Wise函数的斜率）和Voloshin求和规则（光的自由度的质量）是饱和的激发态$Λ_Q$的第一对。
The yield of doubly charmed baryons with excited heavy diquark in $S$ wave and $P$ wave states has been estimated at LHC energies. The observation possibility of such baryons is discussed.
An approach to baryons in the framework of the microscopic Generalized Nambu-Jona-Lasinio chiral potential quark model is considered and quite general arguments are given in favor of effective restoration of chiral symmetry in excited baryons.
Excited Heavy Baryon Spectrum in Large N_c Heavy Quark Effective Theory
用重夸克展开和大N_c展开分析了L=1激发重子质量。在重夸克极限下，质量用Λ-bar参数化，并通过自旋-味破缺算符进一步展开到零阶1/N_c。膨胀系数将在不久的将来由更多的激发态重子数据来确定。
We study the photoproduction helicity amplitudes of negative parity baryons in the context of the $1/N_c$ expansion of QCD. A complete analysis to next-to-leading order is carried out. The results show sub-leading effects to be within the magnitude expected from the $1/N_c$ power counting. They also show significant deviations from the quark model, in particular the need for 2-body effects.
B-physics constraints on baryon number violating couplings: grand unification or R-parity violation
本文研究了重子数破坏相互作用在$B$唯象学中的作用。在各种大统一理论、具有R宇称破坏的超对称理论和复合模型中，双夸克态可能非常轻。利用B衰变和$B - {\bar B}$混合的数据，我们发现这种轻双夸克态与标准模型夸克的耦合受到很强的约束。
Supersymmetric scenarios with R-parity conservation are becoming very constrained due to the lack of missing energy signals, thus motivating those scenarios with R-parity violation. In view of this, we consider a supersymmetric model with R-parity violation and extended by an anomalous horizontal $U(1)_H$ symmetry, where a self-consistent framework with baryon-number violation is achieved along with a proper supression for lepton number violating dimension-5 operators in order to keep a proton decay safe. With the introduction of right-handed neutrinos both Dirac and Majorana masses can be acc…
Diagonal and transition magnetic moments of the negative parity, spin-1/2 heavy baryons are studied in framework of the light cone QCD sum rules. By constructing the sum rules for different Lorentz structures, the unwanted contributions coming from negative (positive) to positive (negative) parity transitions are removed. It is obtained that the magnetic moments of all baryons, except $Λ_b^0$, $Σ_c^+$ and $Ξ_c^{\prime +}$, are quite large. It is also found that the transition magnetic moments between neutral negative parity heavy $Ξ_Q^{\prime 0}$ and $Ξ_Q^0$ baryons are very small. Magnetic mo…
We briefly discuss the large Nc picture for excited baryons, present a new method for the calculation of matrix elements and illustrate it by computing the strong decays of heavy exotic states.
We investigate the possibility of obtaining sizeable R-parity breaking interactions violating baryon number but not lepton number within supersymmetric grand unified theories. Such a possibility allows to ameliorate the naturalness status of supersymmetry while maintaining successful gauge coupling unification, one of its main phenomenological motivations. We show that this can be achieved without fine-tuning or the need of large representations in simple SO(10) models.
Large N_c Limit of Spin-Flavor Breaking in Excited Baryon Levels
在1/ $N_c$展开中，研究了激发态重子能级的自旋味对称性破缺。这种破坏发生在零阶。对于单夸克激发的非奇异重子，在一阶微扰理论中，破缺由一个1-体算符（自旋-轨道）和3个2-体算符给出，它们都涉及激发夸克的轨道角动量。高阶算子可以简化为这组算子。作为例子，我们简要地讨论了p波重子。
Phenomenological Study of Excited Baryons
我们研究了夸克禁闭和手征对称性破缺的重子激发态。第一部分讨论了空间形变重子激发。作为变形的信号，我们研究质量和电磁跃迁。这种空间结构的研究有望提供夸克束缚机制的信息，从而夸克禁闭。第二部分考虑了重子的手征对称性，研究了正宇称重子和负宇称重子。我们证明了重子的手征对称性有两种不同的表示。我们调查的线性西格玛模型的唯象后果。
We review results for the mass spectrum of orbitally excited baryons obtained in the $1/N_c$ expansion. We show the dependence of various contributions to the mass operator as a function of the excitation energy.
A Bjorken sum rule for semileptonic $Ω_b$ decays to ground and excited charmed baryon states
在重夸克极限下，我们导出了半轻子$Ω_b$衰变到基态和低位负宇称激发粲重子态的Bjorken求和规则。我们讨论了这种求和规则对形状因子的限制，并与一些模型进行了比较。
The Strong Coupling Constants of Excited Positive Parity Heavy Mesons in Light Cone QCD
在光锥QCD求和规则的框架下，我们计算了强耦合常数g_（P^（**）P^（*）π），其中P^（**）（D^（**），B^（**））是1^+ p波态，并利用g_（P^（**）P^（*）π计算了D^（**）-> D^* pi和B^（**）-> B^* pi的强子衰变宽度.
Determination of the parity of the pentaquark baryons : Theta^+ and Xi_5
本文研究了五夸克态重子宇称的两种确定方法。首先，我们研究了通过vec{p} vec{p} -> Sigma^+ Theta^+反应过程产生Theta^+，该反应过程被提出来明确地确定Theta^+的宇称。我们观察到明显的差异，在总截面和自旋可观察的A_{xx}。对于棒{K} N -> KXi_5反应过程中的Xi_5，由于巨大的相消干涉，正宇称态的总截面比负宇称态的大约一百倍。
Do parity doublets in the baryon spectrum reflect restoration of chiral symmetry?
讨论了高激发态核子和$Δ^*$共振态的质量谱。该光谱显示出宇称二重态，即总角动量J相同但宇称相反的共振对。宇称二重态是在重子激发能较大时手征对称性恢复的证据。我们比较这个猜想的可能性，即高质量的状态被组织成$(L,S)$ -多重带定义的内禀夸克自旋和轨道角动量。事实上，后一种解释可以更好地描述数据。然而，数据有一个小的统计学上不太显著的趋势，这可能表明手征对称性尚未恢复，但确实影响了高激发态的质量。
Parity doubling is observed in hadron states around 1.5 GeV - and the estimated energy density is found to be high. When a large excitation energy is available and the pions decouple from the quarks, the QCD interaction is still not perturbative. And signature of such a system can exist in the form of small ratio of the shear viscosity to entropy density. This is true for an equation of state which is applicable to the surface of strange star. We indicate the correspondence of parity doubling with the apparently disconnected model calculation of compactness of some pulsars.
We argue that there should exist the large combined fluctuations of chiral and diquark condensates along the phase boundary of QCD at moderately high density and relatively low temperature. Such fluctuations might lead to anomalous production of nucleons and its parity partner, which we propose to detect at NICA.
Excited heavy baryon masses in HQET QCD sum rules
在重夸克有效理论（HQET）框架下，我们构造了14个p波激发的重子的内插流。在1/m_Q展开式的首阶，这些插值电流不会将具有相同J^P的不同态相互混合。本文用QCD求和规则计算了m_Q~ ∞极限下p波激发的J=1/2自旋二重态重子的质量。我们讨论了我们的结果的一些影响。
QCD sum rules for positive and negative parity heavy baryons at next-to-leading order in $α_s$-expansion
本研究构建重夸克极限下正负宇称重重子的QCD求和规则，纳入α_s展开次领头阶修正，发现修正可降低质量预测值、提升Borel参数稳定性，且手征奇凝聚态对负宇称态无贡献。
The magnetic moments of the low lying, negative parity, spin-3/2 baryons are calculated within the light cone QCD sum rules method. The contributions coming from the positive parity, spin-3/2 baryons, as well as from the positive and negative parity spin-1/2 baryons are eliminated by constructing combinations of various invariant amplitudes corresponding to the coefficients of the different Lorentz structures.
We show that in an SU(3)_c\times [SU(2)_L\times U(1)_Y]\times [SU(2)'_R\times U(1)'_Y] framework, the parity symmetry motivated by solving the strong CP problem without resorting to an axion can predict a dark matter particle with a mass around 302 GeV. This dark matter candidate can be directly detected in the presence of a U(1)_Y\times U(1)'_Y kinetic mixing. Furthermore, our model can accommodate a natural way to simultaneously realize an inverse-linear seesaw for neutrino masses and a resonant leptogenesis for baryon asymmetry.
$1/N_c$ Expansion for Excited Baryons
我们推导出的一致性条件约束的激发重子的π介子的强耦合的可能形式。一致性条件是从π介子激发的重子散射振幅满足大N_c Witten计数规则出发的，类似于Dashen，Jenkins和Manohar等人对s波重子的一致性条件。明确地解决了相容性条件，给出了大N_c极限下激发态重子强顶点的最一般允许形式。我们证明了大N_c一致性条件的解与非相对论性夸克模型对这些态的预言相一致，推广了以前对s波重子的结果.在具有任意颜色数N_c的夸克模型中研究了对这些预言的1/N_c修正。
The masses of experimentally known highly excited baryons of negative parity supposed to belong to the $[{\bf 70},\ell^-]$ multiplets ($\ell$ = 1,2,3) of the $N = 3$ band are calculated in the $1/N_c$ expansion method to order $1/N_c$ by using a procedure which allows to considerably reduce the number of linearly independent operators entering the mass formula. The numerical fits to present data show that the coefficients encoding the QCD dynamics have large, comparable values, for the flavor and spin operators. It implies that these operators contribute dominantly to the flavor-spin SU(6) sym…
We argue that three-quark excited states naturally group into quartets, split into two parity doublets, and that the mass splittings between these parity partners decrease higher up in the baryon spectrum. This decreasing mass difference can be used to probe the running quark mass in the mid-infrared power-law regime. A measurement of masses of high-partial wave Delta* resonances should be sufficient to unambiguously establish the approximate degeneracy. We test this concept with the first computation of excited high-j baryon masses in a chirally invariant quark model.
In a bent crystal the $P$-odd effect of short-lived baryon spin rotation could imitate spin rotation caused by assumed EDM. Use of different behavior of $P$-odd and $T$-odd spin rotations at crystal turning around the direction of particle momentum makes it possible to exclude $P$-odd rotation contribution, when measuring short-lived baryons EDM. Subtraction of the measurement results for angle ranges $φ$ and $φ+ π$ from each other enables measuring $T$-odd rotation at scattering of negatively charged beauty and neutral baryons by axes of unbent crystal.
Excited states of heavy baryons in the Skyrme model
通过将精确解出的重介子束缚态量子化为Skyrme孤子，得到了含一个重夸克的重子激发态的能谱。结果与最近的实验观测和夸克模型预言相当，并与重夸克自旋对称性相一致。然而，有些大的依赖性的结果上的重夸克的质量强烈要求将孤子反冲效应。
Magnetic moments of $S_{11}(1535)$ and $S_{11}(1650)$ baryons are studied in the framework of the relativistic three-quark Hamiltonian derived in the Field Correlation Method. The baryon magnetic moments are expressed via the average current quark energies which are defined by the fundamental QCD parameters: the string tension $σ$, the quark masses, and the strong coupling constant $α_s$. For the $J^P=1/2^+$ baryon octet the approach was shown to give a good first approximation to the experimental moments. Resulting magnetic moments for the $J^P=1/2^-$ nucleons are compared both to model calcu…
The relativistic three-quark equations of the ${\bf (70,1^-)}$ baryons are found in the framework of the dispersion relation technique. The approximate solutions of these equations using the method based on the extraction of leading singularities of the amplitude are obtained. The calculated mass values of the ${\bf (70,1^-)}$ multiplet are in good agreement with the experimental ones.
Excited Baryons in Large $N_c$ QCD
这个演讲回顾了最近在使用大$N_c$ QCD描述重子共振方面的进展。重点是该方法的模型独立性。讨论的关键问题包括出现在大$N_c$和散射观测值的直接使用的自旋味对称性。强调了与夸克模型方法的联系。
Decays of 1/2^- Baryons in Chiral Effective Theory
我们构造了一个包含宇称对重子场的$SU(3)_L \times SU(3)_R$对称手征有效模型。假设宇称对中的正宇称重子和负宇称重子具有相反的手征变换性质。利用这个模型，我们研究了负宇称重子的强衰变，直到单圈修正的量级。在$π$和$K$通道中，结果与实验定性一致。我们研究了如何从衰变宽度确定模型参数，并研究了它们的物理意义。讨论了建立其它模型的可能性以及与关联函数分析的关系。
We apply the method of the QCD sum rule, in which positive- and negative-parity baryons couple with each other, to the flavor-octet hyperons and investigate the parity splittings. We also reexamine the nucleon in the method, which was studied in our previous paper, by carefully choosing the Borel weight. Both in the nucleon and hyperon channels the obtained sum rules turn out to have a very good Borel stability and also have a Borel window, an energy region in which the OPE converges and the pole contribution dominates over the continuum contribution. The predicted masses of the positive- and …
Light cone QCD sum rules for the electromagnetic transition form factors among positive and negative parity octet baryons are derived. The unwanted contributions of the diagonal transitions among positive parity octet baryons are eliminated by combining the sum rules derived from different Lorentz structures. The $Q^2$ dependence for the transversal and longitudinal helicity amplitudes are studied.
Excited heavy baryon masses to order Lambda_{QCD}/m_Q from QCD sum rules
在重夸克有效理论的框架下，用QCD求和规则方法计算了p波激发的重子的质量，达到了Lambda_{QCD} /m_Q量级.给出了动能和色磁相互作用的数值结果。给出了自旋为1/2和3/2的二重态之间的分裂，计算结果与实验符合较好。
Excited Heavy Baryon Masses from the 1/N_c Expansion of HQET
在重夸克有效理论框架下，用$1/N_c$展开方法研究了自旋味对称和混合表示下L=1轨道激发的轻夸克重子的质量谱.还考虑了两种表象中重子的混合效应。预测了光谱的一般模式，这将在不久的将来被实验所验证。
$Λ_s (1405)$ and Negative Parity Baryon States
在简要介绍了$\Ls$的历史背景之后，我们回顾了25年来关于$\Ls$是$qqq$（L=1）三夸克态还是$\K$准虚束缚态的争论. Isgur最近提出的在重夸克有效理论HQET中把夸克作为重夸克处理的建议，对本工作起到了推动作用。我们重新审视的经验证据之间的最小混合的单重态和八重态在负宇称重子状态，在非弹性阈值通道的开放可能的动力学起源。最后，我们认为$\Ls$属于一类同时被描述为$qqq$或$q \bar{q}$态和强子束缚态的强子。
Excited Charmed Baryon Decays and Their Implications for Fragmentation Parameters
研究了激发态粲重子二重态$Λ_c^*$的碎裂产生。在重强子手征微扰理论的框架内，随后的强子衰变的二重态的分析产生的衰变产物的角分布和极化的末态重子在各种非微扰碎裂参数的表达式。该系统的未来实验研究将确定这些参数。此外，最近的实验结果表明，固定的重强子手征拉格朗日的参数之一。
Extracting the Flavour Structure of a Baryon-Number R-parity Violating Coupling at the LHC
研究了在一个重子数破坏耦合占主导地位的情况下，由R宇称破坏的中性伴子衰变产生的喷注味含量的探测。在大型强子对撞机上对ATLAS实验进行了模拟，除了lambda”_tjk，因为通过这些耦合的中性伴子衰变被抑制得很厉害。次级顶点分布和重夸克（b-和c-）喷流产生的μ子允许LSP衰变模式之间的歧视。在几乎所有情况下，主导耦合都可以在3.5 σ以上被识别，唯一剩下的模糊性是由于无法区分奇夸克和下夸克。
We study baryon resonances with heavy flavor in a molecular approach, thus as dynamically generated by baryon-meson scattering. This is accomplished by using a unitary coupled-channel model taking, as bare interaction, the extension of the Weinberg-Tomozawa SU(3) Lagrangian. A special attention is payed to the inclusion of heavy-quark spin symmetry and to the study of the generated baryon resonances that complete the heavy-quark spin multiplets. Our model reproduces the Λ_b(5912) and Λ_b(5920) baryons, which were recently observed by the LHCb collaboration. According to our analysis, these two…
Predictions for Decays of Radially Excited Baryons
我们考虑了最低层径向激发重子的强衰变，用SU（6）语言来说，它包括第一激发56重态。假设一个单夸克衰变近似，和可忽略的配置混合，我们的部分衰变宽度与一个单一的介子的最终状态的模型无关的预测。用大N_c QCD的结果预言了未观测态的质量，并通过拟合观测到的衰变，唯象地确定了单体衰变振幅的动量依赖性，从而不需要假设重子空间波函数.我们指出，这些预测与实验的比较可能揭示了罗珀共振是否可以被一致地解释为一个三夸克态。
We review a recently proposed approach to study the lowest negative parity baryons within the $1/N_c$ expansion. The method is based on the derivation of the matrix elements of SU(2N$_f$) generators for mixed symmetric $[N_c-1,1]$ flavor-spin states. Presently it is applied to the N = 1 band and a comparison is made with a former method based on the decoupling of the system into a symmetric core of $N_c-1$ quarks and an excited one. We prove that the decoupling is not necessary and moreover, it misses some important physical consequences.
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