Physics Letters B最新文献

英文中文

Girth and groomed radius of jets recoiling against isolated photons in lead-lead and proton-proton collisions at sNN=5.02 TeV 在铅-铅和质子-质子碰撞中对孤立光子反冲的射流的周长和修饰半径[公式省略]

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2024.139088

This Letter presents the first measurements of the groomed jet radius

R_{g}

and the jet girth g in events with an isolated photon recoiling against a jet in lead-lead (PbPb) and proton-proton (pp) collisions at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The observables

R_{g}

and g provide a quantitative measure of how narrow or broad a jet is. The analysis uses PbPb and pp data samples with integrated luminosities of

1.7 {nb}^{- 1}

and

301 {pb}^{- 1}

, respectively, collected with the CMS experiment in 2018 and 2017. Events are required to have a photon with transverse momentum

p_{T}^{γ} > 100 GeV

and at least one jet back-to-back in azimuth with respect to the photon and with transverse momentum

p_{T}^{jet}

such that

p_{T}^{jet} / p_{T}^{γ} > 0.4

. The measured

R_{g}

and g distributions are unfolded to the particle level, which facilitates the comparison between the PbPb and pp results and with theoretical predictions. It is found that jets with

p_{T}^{jet} / p_{T}^{γ} > 0.8

, i.e., those that closely balance the photon

p_{T}^{γ}

, are narrower in PbPb than in pp collisions. Relaxing the selection to include jets with

p_{T}^{jet} / p_{T}^{γ} > 0.4

reduces the narrowing of the angular structure of jets in PbPb relative to the pp reference. This shows that selection bias effects associated with jet energy loss play an important role in the interpretation of jet substructure measurements.

本文首次测量了在大型强子对撞机的铅-铅（PbPb）和质子-质子（pp）碰撞中，在核子-核子质心能量为5.02 TeV的情况下，一个孤立光子反冲到一个喷流上的整理射流半径Rg和喷流周长g。可观测的Rg和g提供了喷流有多窄或多宽的定量测量。分析使用2018年和2017年CMS实验采集的综合光度分别为1.7 nb - 1和301 pb - 1的PbPb和pp数据样本。事件要求光子具有横向动量pTγ>；100 GeV，并且至少有一个相对于光子的方位背对背的射流，并且具有横向动量pTjet，使得pTjet/pTγ>；0.4。测量的Rg和g分布被展开到粒子水平，这有利于PbPb和pp结果之间的比较，并与理论预测。研究发现，pTjet/pTγ>；0.8的喷流，即与光子pTγ接近平衡的喷流，在PbPb中比在pp碰撞中更窄。将选择范围放宽至pTjet/pTγ>；0.4的射流可以减少PbPb中相对于pp参考的射流角结构的变窄。这表明与射流能量损失相关的选择偏置效应在射流子结构测量的解释中起着重要作用。

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引用次数: 0

Quantum entanglement in nuclear fission 核裂变中的量子纠缠

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139248

Yu Qiang , Junchen Pei , Kyle Godbey

Nuclear fission presents a unique example of quantum entanglement in strongly interacting many-body systems. A heavy nucleus can split into hundreds of combinations of two complementary fragments in the fission process. The entanglement of fragment wave functions is persistent even after separation and impacts the partition of particles and energies between fragments. Based on microscopic dynamical calculations of the fission of ²⁴⁰Pu, this work finds that dynamical quantum entanglement is indispensable in the appearance of sawtooth distributions of average excitation energies of fragments and thus neutron multiplicities, but not in average neutron excess of fragments. Both sawtooth slopes from particle-number projections are found to be steep – a feature which can be alleviated by random fluctuations. The persistent entanglement is mainly due to non-adiabatic dynamics since the final splitting is so fast that the non-localization of wave functions is kept during the separation. These findings may impact the understanding of quantum entanglement more broadly in mesoscopic systems.

核裂变是强相互作用多体系统中量子纠缠的一个独特例子。在裂变过程中，重核可以分裂成数百种由两个互补碎片组成的组合。碎片波函数的纠缠态在分离后仍然存在，影响了碎片间粒子和能量的分配。基于240Pu裂变的微观动力学计算，本工作发现动态量子纠缠在碎片平均激发能的锯齿状分布和中子多重度的出现中是必不可少的，但在碎片的平均中子过剩中却不是。粒子数投影的两种锯齿状斜率都是陡峭的，这一特征可以通过随机波动来缓解。持续纠缠主要是由非绝热动力学引起的，因为最终分裂非常快，在分离过程中保持了波函数的非局域性。这些发现可能会更广泛地影响对介观系统中量子纠缠的理解。

引用次数: 0

Curtright-Zachos supersymmetric deformations of the Virasoro algebra in quantum superspace and Bloch electron systems 量子超空间和Bloch电子系统中Virasoro代数的Curtright-Zachos超对称变形

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139255

Haru-Tada Sato

We introduce supersymmetric extensions of the Hom-Lie deformation of the Virasoro algebra, as realized in the GL(1,1) quantum superspace, for Bloch electron systems under Zeeman effects. The construction is achieved by defining generators through magnetic translations and spin matrix bases, specifically for the

N = 1

and

N = 2

supersymmetric deformed algebras. This approach reveals a structural parallel between the deformed algebra in quantum superspace and its manifestation in Bloch electron systems.

本文介绍了Zeeman效应下Bloch电子系统在GL（1,1）量子超空间中实现的Virasoro代数的homlie变形的超对称扩展。该构造是通过定义磁平移和自旋矩阵基来实现的，特别是对于N=1和N=2超对称变形代数。这种方法揭示了量子超空间中变形代数与其在布洛赫电子系统中的表现之间的结构平行性。

引用次数: 0

Corrigendum to “Search for a common baryon source in high-multiplicity pp collisions at the LHC” [Phys. Lett. B 811 (2020) 135849] “在大型强子对撞机的高多重pp碰撞中寻找共同重子源”的勘误表[物理学杂志]。列托人。B 811 (2020) 135849]

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2024.139233

引用次数: 0

Prospective analysis of CKM element |Vcd| and D+-meson decay constant from leptonic decays D+ → ℓ+ν CKM元素|Vcd|和D+-介子衰变常数从轻子衰变D+ →

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2024.139240

Ya-Xiong Wang , Hai-Jiang Tian , Yin-Long Yang , Tao Zhong , Hai-Bing Fu

<div><div>The leptonic decay of <math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math>-meson has attracted significant interest due to its unique characteristics. In this paper, we carry out an investigation into the <math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math>-meson leptonic decays <math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>ℓ</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>ℓ</mi></mrow></msub></math> with <math><mi>ℓ</mi><mo>=</mo><mo>(</mo><mi>e</mi><mo>,</mo><mi>μ</mi><mo>,</mo><mi>τ</mi><mo>)</mo></math> by employing the QCD sum rules approach. In which the <math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math>-meson decay constant <math><msub><mrow><mi>f</mi></mrow><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub></math> is an important input parameter in the process. To enhance the accuracy of our calculations for <math><msub><mrow><mi>f</mi></mrow><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub></math>, we consider the quark propagator and vertex up to dimension-six within the framework of background field theory. Consequently, we obtain the QCD sum rule expression for <math><msub><mrow><mi>f</mi></mrow><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub></math> up to dimension-six condensates, yielding <math><msub><mrow><mi>f</mi></mrow><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub><mo>=</mo><mn>203.0</mn><mo>±</mo><mn>1.5</mn><mspace></mspace><mrow><mi>MeV</mi></mrow></math>. Our result is in good agreement with BESIII measurements and theoretical predictions. We also present the integrated decay widths for the <math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math>-meson in three channels <math><mi>Γ</mi><mo>(</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub><mo>)</mo><mo>=</mo><mo>(</mo><msubsup><mrow><mn>5.263</mn></mrow><mrow><mo>−</mo><mn>0.075</mn></mrow><mrow><mo>+</mo><mn>0.076</mn></mrow></msubsup><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>21</mn></mrow></msup><mspace></mspace><mrow><mi>GeV</mi></mrow></math>, <math><mi>Γ</mi><mo>(</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>)</mo><mo>=</mo><mo>(</mo><msubsup><mrow><mn>2.236</mn></mrow><mrow><mo>−</mo><mn>0.032</mn></mrow><mrow><mo>+</mo><mn>0.032</mn></mrow></msubsup><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>16</m

D+介子的轻子衰变以其独特的特性引起了人们的广泛关注。本文用QCD求和规则方法研究了当r =(e,μ,τ)时D+-介子轻子衰变D+→r +ν r。其中D+介子衰变常数fD+是该过程的重要输入参数。为了提高fD+计算的准确性，我们在背景场论的框架内考虑了夸克传播子和六维顶点。由此，我们得到了fD+至六维凝析物的QCD求和规则表达式，得到fD+=203.0±1.5MeV。我们的结果与BESIII测量和理论预测很好地吻合。我们还给出了三个通道中D+-介子的积分衰减宽度Γ（D+→e+νe）=(5.263−0.075+0.076)×10−21GeV， Γ（D+→μ+νμ）=(2.236−0.032+0.032)×10−16GeV和Γ（D+→τ+ντ）=(5.958−0.085+0.086)×10−16GeV。据此，我们计算了电子、介子和tau通道的分支分数B(D+→→r +νe)=(8.260−0.118+0.119)×10−9，B(D+→μ+νμ)=(3.508−0.050+0.051)×10−4和B(D+→τ+ντ)=(0.935−0.013+0.013)×10−3。此外，我们利用BESIII协作得到的分支分数B（D+→μ+νμ）对CKM矩阵元素|Vcd|进行了预测，得到|Vcd|=0.227−0.001+0.002。

引用次数: 0

Coalescence formation of muonic atoms at RHIC RHIC中介子原子的聚结形成

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139242

Xiaofeng Wang , Frank Geurts , Zebo Tang , Kefeng Xin , Zhangbu Xu , Yifei Zhang , Long Zhou

The discovery of exotic muonic atoms, including antimatter hydrogen muonic atoms and kaon muonic atoms, constitutes a milestone in our ability to make and study new forms of matter. Relativistic heavy-ion collisions provide the only likely condition for production and detection of these exotic atoms. Taking Coulomb correlations into account from the time of the fireball freeze-out, which refers to the cessation of hadronic interactions in the high-temperature, high-density region formed after the collision, until the formation of a stable atom has dramatic consequences on the expected yields of these atoms. When the coalescence model with the assumption of quantum wave function localization is applied to the formation of muonic atoms, we find that the atom yields are about two orders of magnitude higher than previously predicted.

奇异介子原子的发现，包括反物质氢介子原子和介子原子，是我们制造和研究新物质形式能力的一个里程碑。相对论性重离子碰撞为产生和探测这些外来原子提供了唯一可能的条件。考虑到库仑相关性，从火球冻结到碰撞后形成的高温高密度区域的强子相互作用停止，直到形成一个稳定的原子，对这些原子的预期产率产生了巨大的影响。当将具有量子波函数局域化假设的聚结模型应用于子原子的形成时，我们发现原子产率比先前预测的要高两个数量级。

引用次数: 0

Z′-mediated dark matter freeze-in at stronger coupling

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139268

Giorgio Arcadi , David Cabo-Almeida , Oleg Lebedev

We study freeze-in production of fermionic dark matter mediated by a

Z^{'}

gauge boson. In particular, we explore the regime of Boltzmann-suppressed production, when the Standard Model (SM) thermal bath temperature never exceeds the dark matter mass. The corresponding gauge coupling is then required to be significant, up to order one. As a result, this class of freeze-in models can be probed by the current and future direct dark matter detection experiments.

引用次数: 0

Early matter domination at colliders: Long live the glueball!

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139292

Fady Bishara , Filippo Sala , Kai Schmidt-Hoberg

We prove that collider searches for long-lived particles (LLPs) can test the dynamics responsible for matter domination in the early universe. In this letter we concentrate on the specific example of glueballs from a GeV-scale confining dark sector and compute the dilution of cosmological relics induced by their decay. We then show that searches for long-lived glueballs from Higgs decays test increasing values of dilution at ATLAS and CMS, CODEX-b, ANUBIS and MATHUSLA. We identify the general features that make models of early matter domination discoverable via LLPs at colliders. Our study provides a quantitative physics motivation to test longer lifetimes.

引用次数: 0

Testing quantum gravity with dilute dipolar Bose gases

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139291

Asma Tahar Taiba , Abdelâali Boudjemâa

We systematically investigate the effects of quantum gravity on the ground-state properties of dilute homogeneous dipolar Bose gases using the Hartree-Fock-Bogoliubov theory based on the generalized uncertainty principle. We calculate quantum gravity corrections to the condensed fraction, the equation of state, the critical temperature and the superfluid fraction. Improved upper bounds on the generalized uncertainty principle parameters are found. We compare our predictions with previous experimental and theoretical results.

引用次数: 0

Pseudorapidity distributions of charged hadrons in lead-lead collisions at sNN=5.36TeV

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B

Pub Date : 2025-02-01 DOI: 10.1016/j.physletb.2025.139279

The pseudorapidity (η) distributions of charged hadrons are measured using data collected at the highest ever nucleon-nucleon center-of-mass energy of

\sqrt{s_{_{NN}}} = 5.36 TeV

for collisions of lead-lead ions. The data were recorded by the CMS experiment at the LHC in 2022 and correspond to an integrated luminosity of

0.30 \pm 0.03 {μ b}^{- 1}

. Using the CMS silicon pixel detector, the yields of primary charged hadrons produced in the range

| η | < 2.6

are reported. The evolution of the midrapidity particle density as a function of collision centrality is also reported. In the 5% most central collisions, the charged-hadron η density in the range

| η | < 0.5

is found to be

2032 \pm 91 (syst)

, with negligible statistical uncertainty. This result is consistent with an extrapolation from nucleus-nucleus collision data at lower center-of-mass energies. Comparisons are made to various Monte Carlo event generators and to previous measurements of lead-lead and xenon-xenon collisions at similar collision energies. These new data detail the dependence of particle production on the collision energy, initial collision geometry, and the size of the colliding nuclei.

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Physics Letters B

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