Physics Letters B最新文献

英文中文

The gallium solar neutrino capture cross section revisited

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.2025.139259

W.C. Haxton , Evan Rule

Solar neutrino flux constraints from the legacy GALLEX/GNO and SAGE experiments continue to influence contemporary global analyses of neutrino properties. The constraints depend on the neutrino absorption cross sections for various solar sources. Following recent work updating the ⁵¹Cr and ³⁷Ar neutrino source cross sections, we reevaluate the ⁷¹Ga solar neutrino cross sections, focusing on contributions from transitions to ⁷¹Ge excited states, but also revising the ground-state transition to take into account new ⁷¹Ge electron-capture lifetime measurements and various theory corrections. The excited-state contributions have been traditionally taken from forward-angle

(p, n)

cross sections. Here we correct this procedure for the

\approx 10 %

–20% tensor operator contribution that alters the relationship between Gamow-Teller and

(p, n)

transition strengths. Using state-of-the-art nuclear shell-model calculations to evaluate this correction, we find that it lowers the ⁸B and hep neutrino cross sections. However, the addition of other corrections, including contributions from near-threshold continuum states that radiatively decay, leads to an overall increase in the ⁸B and hep cross sections of

\approx 10 %

relative to the values recommended by Bahcall. Uncertainties are propagated using Monte Carlo simulations.

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引用次数: 0

On constraints of the (β-deformed) partition functions with W-representations

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.2025.139286

Yu-Sen Zhu , Ren Cuo Ji , Min-Li Li , Rui Wang

We investigate the constraints of the (β-deformed) partition functions with W-representations in the literature, which can be realized by the interpolating two-matrix models (two β-ensembles). For the non-deformed partition functions, we construct their Virasoro and higher order constraints using the total derivative operators. For the β-deformed partition functions, we derive their Virasoro constraints in terms of the constructed Virasoro operators. Meanwhile, we obtain a new realization of the Virasoro algebra in terms of the Dunkl operators and the conserved quantities in the rational Calogero model.

引用次数: 0

Measurement of inclusive and differential cross sections for W+W− production in proton-proton collisions at s=13.6 TeV TeV下质子-质子碰撞W+W−产生的包含截面和微分截面的测量

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.2024.139231

Measurements at

\sqrt{s} = 13.6 TeV

of the opposite-sign W boson pair production cross section in proton-proton collisions are presented. The data used in this study were collected with the CMS detector at the CERN LHC in 2022, and correspond to an integrated luminosity of 34.8

{fb}^{- 1}

. Events are selected by requiring one electron and one muon of opposite charge. A maximum likelihood fit is performed on signal- and background-enriched data categories defined by the flavor and charge of the leptons, the number of jets, and number of jets originating from b quarks. The overall sensitivity is significantly better than that of previous results with a similar integrated luminosity. The improvement comes from a more refined control of experimental uncertainties and an improved fit strategy. An inclusive

W^{+} W^{-}

production cross section of

125.7 \pm 5.6

pb is measured, in agreement with standard model predictions. Cross sections are also reported in a fiducial region close to that of the detector acceptance, both inclusively and differentially, as a function of the jet multiplicity in the event. For the first time in proton-proton collisions,

W W

events with zero, one, and at least two jets are studied simultaneously and compared with recent theoretical predictions.

给出了质子-质子碰撞中反符号W玻色子对产生截面在s=13.6TeV下的测量结果。本研究使用的数据是在CERN大型强子对撞机的CMS探测器于2022年收集的，对应的综合光度为34.8fb−1。事件的选择需要一个电子和一个带相反电荷的介子。对由轻子的味道和电荷、喷流数量和源自b夸克的喷流数量定义的信号和背景丰富的数据类别进行了最大似然拟合。综合光度相近的情况下，整体灵敏度明显优于以往的结果。改进来自对实验不确定性的更精细的控制和改进的拟合策略。测量到的W+W−生产截面为125.7±5.6 pb，与标准模型预测一致。作为事件中射流多重性的函数，在接近探测器接收范围的基准区域也报告了横截面，包括和差分。第一次在质子-质子碰撞中，同时研究了零、一和至少两个喷流的WW事件，并与最近的理论预测进行了比较。

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引用次数: 0

Polarization of thermal dilepton radiation

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.2025.139267

Florian Seck , Bengt Friman , Tetyana Galatyuk , Hendrik van Hees , Ralf Rapp , Enrico Speranza , Jochen Wambach

The invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium electromagnetic spectral function, we predict polarization observables and compare them to experiment. This allows, for the first time, independent tests of the longitudinal and transverse components of the virtual photon's selfenergy. While the low- and high-mass regions exhibit the expected limits of transverse and unpolarized photons, respectively, baryon-driven medium effects in the ρ-meson mass region create a marked longitudinal polarization that transits into a largely unpolarized emission from the quark-gluon plasma, thus providing a sensitive test of microscopic emission processes in QCD matter. Applications to available data from the HADES and NA60 experiments at SIS and SPS energies, respectively, are consistent with our predictions and set the stage for quantitative polarization studies at FAIR and collider energies.

{"title":"Polarization of thermal dilepton radiation","authors":"Florian Seck , Bengt Friman , Tetyana Galatyuk , Hendrik van Hees , Ralf Rapp , Enrico Speranza , Jochen Wambach","doi":"10.1016/j.physletb.2025.139267","DOIUrl":"10.1016/j.physletb.2025.139267","url":null,"abstract":"<div><div>The invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium electromagnetic spectral function, we predict polarization observables and compare them to experiment. This allows, for the first time, independent tests of the longitudinal and transverse components of the virtual photon's selfenergy. While the low- and high-mass regions exhibit the expected limits of transverse and unpolarized photons, respectively, baryon-driven medium effects in the <em>ρ</em>-meson mass region create a marked longitudinal polarization that transits into a largely unpolarized emission from the quark-gluon plasma, thus providing a sensitive test of microscopic emission processes in QCD matter. Applications to available data from the HADES and NA60 experiments at SIS and SPS energies, respectively, are consistent with our predictions and set the stage for quantitative polarization studies at FAIR and collider energies.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139267"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A simple parametrisation of the pion form factor

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.2025.139266

Matthew Kirk , Bastian Kubis , Méril Reboud , Danny van Dyk

We discuss a novel and simple parametrisation of the pion vector form factor that transparently connects spacelike and timelike regions of the momentum transfer

q^{2}

. Our parametrisation employs the framework of conformal mapping and respects the known analyticity properties of the form factor, accounting explicitly for the

ρ (770)

-meson pole. The parametrisation manifestly fulfils the normalisation condition at

q^{2} = 0

as well as further restrictions at the pion production threshold and in the limit

| q^{2} | \to \infty

. In contrast to the widely used Omnès parametrisation, our approach does not use the pion–pion scattering phase shift as input. We confront the parametrisation with experimental data from πH scattering and

τ^{-} \to π^{-} π^{0} ν

decay. We already find a good description of the data with only five free parameters, which include the pole mass and decay width of the

ρ (770)

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引用次数: 0

Unitarization of the one-loop graviton-graviton scattering amplitudes and study of the graviball

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.2025.139275

J.A. Oller , Marcela Peláez

From the graviton-graviton scattering amplitudes calculated perturbatively in quantum gravity to the one-loop order, we develop further a formalism that allows one to calculate infrared-finite partial-wave amplitudes fulfilling perturbative unitarity. As a result of this process a parameter dubbed

\ln a

emerges that separate between infrared and typical external momenta. The resulting partial-wave amplitudes are next unitarized by employing the Inverse Amplitude Method and the algebraic-

N / D

method. Then, the graviball resonance, with a similar pole position, is confirmed in the S-wave partial-wave amplitude for all unitarization methods, also with respect to the unitarization of only the leading-order amplitude. Although the spectrum of the theory is independent of the specific value of

\ln a

, the requirement for a well-behaved unitarized effective field theory of gravity identifies the optimal range of

\ln a

for our next-to-leading-order calculations as

0.5 ≲ \ln a ≲ 1.7

. Briefly, we discuss the D-wave scattering that is weaker than the S-wave scattering, repulsive and non-resonant for

\ln a \approx 1

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引用次数: 0

Right-handed interactions in puzzling B-decays

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.2025.139285

Damir Bečirević , Svjetlana Fajfer , Nejc Košnik , Lovre Pavičić

We explain the difference between the measured decay widths of

b \to c τ ν

processes and of

B \to K ν \bar{ν}

and their values predicted in the Standard Model by introducing the right-handed interactions both to quarks and to leptons. At low energy scales, in addition to the Standard Model particles, we assume the presence of an additional neutral lepton (right-handed neutrino). We then show a specific realization of such a scenario in a model with a single scalar leptoquark (

S_{1}

), and discuss the corresponding phenomenology.

引用次数: 0

Connecting quasi-normal modes with causality in Lovelock theories of gravity 洛夫洛克引力理论中准正模与因果关系的联系

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.2024.139219

Avijit Chowdhury , Akash K. Mishra , Sumanta Chakraborty

The eikonal correspondence between the quasi-normal modes (QNMs) of asymptotically flat static spherically symmetric black holes and the properties of unstable null circular geodesics is studied in the case of higher dimensional Lovelock black holes (BHs). It is known that such correspondence does not generically hold for gravitational QNMs associated with BHs in Lovelock theories. In the present work, we revisit this correspondence and establish the relationship between the eikonal QNMs and the causal properties of the gravitational field equations in Lovelock theories of gravity.

研究了高维Lovelock黑洞的渐近平坦静态球对称黑洞的准正态模（QNMs）与不稳定零圆测地线的对角对应关系。众所周知，在洛夫洛克理论中，这种对应关系并不普遍适用于与黑洞相关的引力QNMs。在目前的工作中，我们重新审视了这种对应关系，并在洛夫洛克引力理论中建立了eikonal QNMs与引力场方程的因果性质之间的关系。

引用次数: 0

Evolution of interior entropy of a loop quantum-corrected black hole pierced by a cosmic string 被宇宙弦穿透的环形量子修正黑洞内部熵的演化

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.2024.139237

Wei Zhang

The concept of interior entropy of black hole provides a possible way to deal with information problem. We derive evolution relation between interior entropy and Bekenstein-Hawking entropy for a loop quantum-corrected black hole with large mass pierced by an infinitely straight cosmic string during Hawking radiation. We find that the present cosmic string can influence the evolution relation between these two types of entropy under black hole evaporation and the second law of thermodynamics is satisfied for the total variation of these two types of entropy.

黑洞内部熵的概念为处理信息问题提供了一种可能的途径。我们推导了在霍金辐射作用下被无限直宇宙弦刺穿的大质量环量子修正黑洞的内部熵与贝肯斯坦-霍金熵的演化关系。我们发现，现在的宇宙弦可以影响黑洞蒸发下这两类熵之间的演化关系，并且这两类熵的总变化满足热力学第二定律。

引用次数: 0

On the realization of infinite (continuous) spin field representations in AdS4 space AdS4空间中无限（连续）自旋场表示的实现

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.2024.139226

I.L. Buchbinder , S.A. Fedoruk , A.P. Isaev , M.A. Podoinitsyn

We study the symmetry properties of infinite spin fields in

Ad S_{4}

space which are involved in the Lagrangian model proposed in arXiv:2403.14446 [hep-th] where the main role is played by operator constraints. It is shown that the conditions defining infinite spin states in

Ad S_{4}

space are

SO (2, 3)

-invariant. It is found that in the model under consideration the Casimir operators are completely fixed by the constraint operators and only one of the Casimir operators is independent. It is shown that in this model, infinite spin fields in

Ad S_{4}

space are described by the most degenerate representations of the

SO (2, 3)

group.

在arXiv:2403.14446 [help -th]中提出的拉格朗日模型中，我们研究了AdS4空间中无限自旋场的对称性，其中算子约束起主要作用。证明了AdS4空间中定义无限自旋态的条件是SO（2,3）不变的。在考虑的模型中，卡西米尔算子完全被约束算子固定，只有一个卡西米尔算子是独立的。结果表明，在该模型中，AdS4空间中的无限自旋场由SO（2,3）群的最简并表示来描述。

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