Inspired by the newly observed <math><mi>X</mi><mo>(</mo><mn>2085</mn><mo>)</mo></math> by the BESIII Collaboration, we study the strong decay behaviors of excited axial-vector strange mesons within the quark pair creation model. Our results indicate that the <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>1793</mn><mo>)</mo><mo>/</mo><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>1861</mn><mo>)</mo></math> can be regarded as the same <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>2</mn><mi>P</mi><mo>)</mo></math> state, and the <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>1911</mn><mo>)</mo></math> is assigned as the <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>2</mn><msup><mi>P</mi><mo>′</mo></msup><mo>)</mo></math> state. Considering the mass, spin-parity, and decay behaviors, we interpret the newly observed <math><mi>X</mi><mo>(</mo><mn>2085</mn><mo>)</mo></math> as the radially excited <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>3</mn><mi>P</mi><mo>)</mo></math> state, which mainly decays into the <math><msup><mi>K</mi><mo>*</mo></msup><mo>(</mo><mn>1410</mn><mo>)</mo><mi>π</mi></math>, <math><mi>ρ</mi><msup><mi>K</mi><mo>*</mo></msup></math>, <math><mi>ω</mi><mo>(</mo><mn>1420</mn><mo>)</mo><mi>K</mi></math>, <math><mi>ρ</mi><mo>(</mo><mn>1450</mn><mo>)</mo><mi>K</mi></math>, and <math><mi>ρ</mi><mi>K</mi></math> final states. Also, the width of the <math><msub><mi>K</mi><mn>1</mn></msub><mo>(</mo><mn>3</mn><msup><mi>P</mi><mo>′</mo></msup><mo>)</mo></math> state is predicted to be about 300 MeV, which can be searched for by future experiments. We expect that present calculations can help us to better understand the nature of the <math><mi>X</mi><mo>(</mo><mn>2085</mn><mo>)</mo></math> structure and near-threshold enhancements in the baryon-antibaryon invariant mass distributions.

China

Tian-Ge Li

Sheng-Chao Zhang

Guan-Ying Wang

Qi-Fang Lü

Canonical interpretation of the newly observed <math><msup><mi>J</mi><mi>P</mi></msup><mo>=</mo><msup><mn>1</mn><mo>+</mo></msup></math> structure <math><mi>X</mi><mo>(</mo><mn>2085</mn><mo>)</mo></math>

Recently, the Belle and LHCb Collaborations have measured the $$\Lambda ^+_c \rightarrow p K^- \pi ^+$$ decay and reported the $$K^- p$$ invariant mass distribution, which shows a clear cusp structure around the $$\eta \Lambda $$ threshold. In this work, we have analyzed this process by considering the triangle mechanism and the -wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach, which dynamically generates the $$\Lambda (1670)$$ . Our results are in good agreement with the Belle measurements, which implies that the cusp structure around $$\eta \Lambda $$ threshold could be associated with the $$\Lambda (1670)$$ with the molecular nature.

Spain

Man-Yu Duan

Wen-Tao Lyu

Jing-Yu Zhu

En Wang

Explore the properties of $$\Lambda (1670)$$ in the Cabibbo-favored process $$\Lambda ^+_c \rightarrow p K^- \pi ^+$$

We construct a new stellar compact object model in the regime of anisotropic pressure using the framework of gravitational decoupling via minimal geometric deformation, with the particularity that the seed solution used is the known Kohler–Chao–Tikekar cosmological solution. As an extra condition to close the Einstein’s field equations resulting for this construction, we use a generalised complexity factor for self-gravitating spheres to the well-known Wyman IIa solution. The resulting model fulfils the fundamental physical acceptability stellar conditions for a compactness factor of a pulsar SMC X-1. The stability of the model is also investigated.

Ecuador

B. Siza

J. Andrade

D. Santana

Pakistan

Azerbaijan

Tayyab Naseer

Anisotropic extension of the Kohler–Chao–Tikekar cosmological solution with like Wyman IIa complexity factor

This work explores the construction of spherically symmetric models of stellar interiors by incorporating the null complexity factor (CF) as an additional constraint. This supplementary condition helps us to close an array of stellar structure equations resulting from the process of gravitational decoupling. By making use of MGD-type gravitational decoupling we analyze the role of gravitational decoupling and its impact on the complexity of static, self-gravitational systems. We begin by considering an anisotropic seed solution described by the Kohler–Chao–Tikekar metric ansatz. We then apply the minimal geometric deformation technique to this seed solution, imposing the constraint that the effective anisotropic factor vanishes. This constraint leads to the generation of an isotropic stellar solution. Furthermore, we construct a second family of solutions in which the CF, remains the same for both the seed solution and its minimally deformed counterpart. Our analysis further investigated the influence of both the deformation parameter and the CF on the structural properties of the static and spherically symmetric stellar objects.

Saudi Arabia

Abeer Albalahi

Z. Yousaf

S. Khan

Akbar Ali

Anisotropic interior models with Kohler–Chao–Tikekar-like complexity factor

Motivated by the Belle measurements of the process <math><msubsup><mi>Λ</mi><mi>c</mi><mo>+</mo></msubsup><mo>→</mo><mi>η</mi><msup><mi>π</mi><mo>+</mo></msup><mi>Λ</mi></math>, we investigate this process by considering the contributions from the <math><mi>Λ</mi><mo>(</mo><mn>1670</mn><mo>)</mo></math>, <math><msub><mi>a</mi><mn>0</mn></msub><mo>(</mo><mn>980</mn><mo>)</mo></math>, and <math><mi>Σ</mi><mo>(</mo><mn>1385</mn><mo>)</mo></math>. In addition, we also consider the predicted low-lying baryon <math><msup><mi>Σ</mi><mo>*</mo></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup><mo>)</mo></math>. Our results involving the <math><msup><mi>Σ</mi><mo>*</mo></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup><mo>)</mo></math> are favored by fitting to the Belle data of the <math><mi>η</mi><mi>Λ</mi></math> and <math><msup><mi>π</mi><mo>+</mo></msup><mi>Λ</mi></math> invariant mass distributions. Furthermore, we predict the <math><mi>η</mi><msup><mi>π</mi><mo>+</mo></msup></math> invariant mass distribution and the angular distribution <math><mi>d</mi><mi>Γ</mi><mo>/</mo><mi>d</mi><mi>cos</mi><mi>θ</mi></math>, which are significantly different depending on whether or not the contribution from the <math><msup><mi>Σ</mi><mo>*</mo></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup><mo>)</mo></math> is considered. Finally, we show that, with the contribution from the <math><msup><mi>Σ</mi><mo>*</mo></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup><mo>)</mo></math>, the calculated Dalitz plot agrees with the Belle measurements. Future precise measurements of the process <math><msubsup><mi>Λ</mi><mi>c</mi><mo>+</mo></msubsup><mo>→</mo><mi>η</mi><msup><mi>π</mi><mo>+</mo></msup><mi>Λ</mi></math> could shed further light on the existence of the low-lying <math><msup><mi>Σ</mi><mo>*</mo></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup><mo>)</mo></math>.

Jia-Jun Wu

Li-Sheng Geng

Ju-Jun Xie

Evidence of the low-lying baryon <math><mrow><msup><mrow><mi>Σ</mi></mrow><mrow><mo>*</mo></mrow></msup><mo>(</mo><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow></math> in the process <math><msubsup><mi>Λ</mi><mi>c</mi><mo>+</mo></msubsup><mo>→</mo><mi>η</mi><msup><mi>π</mi><mo>+</mo></msup><mi>Λ</mi></math>

This paper is devoted to obtaining and studying two interior exact solutions of Einstein’s Field Equations (EFE) for spherical geometry in the context of gravitational decoupling (GD) through minimal geomentric deformation (MGD). We take the well-known Kohler–Chao–Tikekar cosmological solution as a seed in the framework of GD to first obtain an isotropic solution, which is decoupled again in order to obtain a second stellar anisotropic solution. Both resulting models turn out to be physically viable stellar models. Their stability is also being studied.

 Oswaldo-Villacrés

S. Carrera

Gravitational decoupled interior solutions from Kohler–Chao–Tikekar cosmological model

This work is devoted to transforming the known cosmological solution of Kohler–Chao–Tikekar into an anisotropic interior solution using the framework of Gravitational Decoupling by minimal geometric deformation. The resulting interior solution fulfils the fundamental physical acceptability stellar conditions for a specific set of compactness factors. The stability of the model is also investigated.

K. Ortega

W. Klínger

R. Copa

S. Medina

J. Cruz

Anisotropic extension of Kohler–Chao–Tikekar solution by minimal geometric deformation

It is believed that there are more fundamental gauge symmetries beyond those described by the Standard Model of particle physics. The scales of these new gauge symmetries are usually too high to be reachable by particle colliders. Considering that the phase transition (PT) relating to the spontaneous breaking of new gauge symmetries to the electroweak symmetry might be strongly first order, we propose considering the stochastic gravitational waves (GW) arising from this phase transition as an indirect way of detecting these new fundamental gauge symmetries. As an illustration, we explore the possibility of detecting the stochastic GW generated from the PT of 
					 in the space-based interferometer detectors. Our study demonstrates that the GW energy spectrum is reachable by the LISA, Tianqin, Taiji, BBO, and DECIGO experiments only for the case where the spontaneous breaking of 
					 is triggered by at least two electroweak singlet scalars.
				

Wei Chao

Wen-Feng Cui

Huai-Ke Guo

Jing Shu

Gravitational wave imprint of new symmetry breaking JS is Supported by the National Natural Science Foundation of China (11647601, 11690022, 11675243) and also Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB23030100). Wei Chao is Supported by the National Natural Science Foundation of China (11775025)

Relativistic millicharged particles (<math><msub><mi>χ</mi><mi>q</mi></msub></math>) have been proposed in various extensions to the standard model of particle physics. We consider the scenarios where they are produced at nuclear reactor core and via interactions of cosmic rays with the Earth’s atmosphere. Millicharged particles could also be candidates for dark matter and become relativistic through acceleration by supernova explosion shock waves. The atomic ionization cross section of <math><msub><mi>χ</mi><mi>q</mi></msub></math> with matter are derived with the equivalent photon approximation. Smoking-gun signatures with significant enhancement in the differential cross section are identified. New limits on the mass and charge of <math><msub><mi>χ</mi><mi>q</mi></msub></math> are derived, using data taken with a point-contact germanium detector with 500 g mass functioning at an energy threshold of 300 eV at the Kuo-Sheng Reactor Neutrino Laboratory.

Taiwan

India

L. Singh

United States

J. W. Chen

H. C. Chi

C.P. Liu

M. K. Pandey

H. T. Wong

C. P. Wu

Türkiye

M. Agartioglu

M. Deniz

H. B. Li

S. T. Lin

V. Sharma

M. K. Singh

V. Singh

Q. Yue

Constraints on millicharged particles with low-threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory

We present a systematic short time expansion for the generating function of the one point height probability distribution for the KPZ equation with droplet initial condition, which goes much beyond previous studies. The expansion is checked against a numerical evaluation of the known exact Fredholm determinant expression. We also obtain the next order term for the Brownian initial condition. Although initially devised for short time, a resummation of the series allows to obtain also the long time large deviation function, found to agree with previous works using completely different techniques. Unexpected similarities with stationary large deviations of TASEP with periodic and open boundaries are discussed. Two additional applications are given. (i) Our method is generalized to study the linear statistics of the Airy point process, i.e. of the GUE edge eigenvalues. We obtain the generating function of the cumulants of the empirical measure to a high order. The second cumulant is found to match the result in the bulk obtained from the Gaussian free field by Borodin and Ferrari [1,2], but we obtain systematic corrections to the Gaussian free field (higher cumulants, expansion towards the edge). This also extends a result of Basor and Widom [3] to a much higher order. We obtain large deviation functions for the Airy point process for a variety of linear statistics test functions. (ii) We obtain results for the counting statistics of trapped fermions at the edge of the Fermi gas in both the high and the low temperature limits.

France

Alexandre Krajenbrink

Pierre Le Doussal

Sylvain Prolhac

Systematic time expansion for the Kardar–Parisi–Zhang equation, linear statistics of the GUE at the edge and trapped fermions