Probing the internal organization of hidden-charm pentaquarks—including the spin-color correlations that distinguish compact diquark-diquark-antiquark configurations from loosely bound hadronic molecules—requires observables that go beyond mass spectroscopy. We argue that multicurrent QCD light-cone sum rules provide a diagnostic framework for this problem, not only through the expected sensitivity of the magnetic moment to the internal spin structure but, more importantly, through exact analytic relations among the flavor-sector contributions that are enforced by the algebra of the interpolating currents themselves. We identify two such signatures that emerge from our analysis of compact diquark-diquark-antiquark configurations: (i) for any of the four currents considered the light-quark contributions satisfy the exact ratio <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><mi>u</mi></msub><mo>/</mo><msub><mi>μ</mi><mi>d</mi></msub><mo>=</mo><msub><mi>e</mi><mi>u</mi></msub><mo>/</mo><msub><mi>e</mi><mi>d</mi></msub><mo>=</mo><mo>−</mo><mn>2</mn></math>, reflecting a common Lorentz-color kernel that couples <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>u</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>d</mi></math> only through their electric charges; and (ii) for the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>J</mi><mn>3</mn></msub><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></math> current the charm-quark contribution vanishes identically, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><mi>c</mi></msub><mo>=</mo><mn>0</mn></math>, arising not from the pseudoscalar embedding of the charm diquark alone—since the same embedding occurs in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>J</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></math>, which yields a nonzero <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><mi>c</mi></msub></math>—but from the specific Dirac structure associated with the anticharm coupling in the global current, which produces an analytic cancellation in the operator product expansion. We illustrate these signatures through explicit calculations using four independent diquark-diquark-antiquark interpolating currents <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>J</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mi>–</mi><msub><mi>J</mi><mn>4</mn></msub><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></math>, assumed to carry <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>J</mi><mi>P</mi></msup><mo>=</mo><msup><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>−</mo></msup></math>, and obtain <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><msub><mi>J</mi><mn>1</mn></msub></msub><mo>=</mo><mo>−</mo><mn>1.3</mn><msubsup><mn>5</mn><mrow><mo>−</mo><mn>0.28</mn></mrow><mrow><mo>+</mo><mn>0.35</mn></mrow></msubsup><msub><mi>μ</mi><mi>N</mi></msub></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><msub><mi>J</mi><mn>2</mn></msub></msub><mo>=</mo><mn>3.1</mn><msubsup><mn>4</mn><mrow><mo>−</mo><mn>0.50</mn></mrow><mrow><mo>+</mo><mn>0.65</mn></mrow></msubsup><msub><mi>μ</mi><mi>N</mi></msub></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><msub><mi>J</mi><mn>3</mn></msub></msub><mo>=</mo><mn>1.0</mn><msubsup><mn>1</mn><mrow><mo>−</mo><mn>0.20</mn></mrow><mrow><mo>+</mo><mn>0.25</mn></mrow></msubsup><msub><mi>μ</mi><mi>N</mi></msub></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><msub><mi>J</mi><mn>4</mn></msub></msub><mo>=</mo><mo>−</mo><mn>1.7</mn><msubsup><mn>9</mn><mrow><mo>−</mo><mn>0.34</mn></mrow><mrow><mo>+</mo><mn>0.41</mn></mrow></msubsup><msub><mi>μ</mi><mi>N</mi></msub></math>. These four predictions are then assigned to the observed <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>P</mi><mrow><mi>ψ</mi><mi>s</mi></mrow><mi mathvariant="normal">Λ</mi></msubsup><mo stretchy="false">(</mo><mn>4338</mn><mo stretchy="false">)</mo></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>P</mi><mrow><mi>ψ</mi><mi>s</mi></mrow><mi mathvariant="normal">Λ</mi></msubsup><mo stretchy="false">(</mo><mn>4459</mn><mo stretchy="false">)</mo></math> resonances on the basis of the mass predictions of recent QCD sum rule analyses; we emphasize, however, that the corresponding <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>±</mo><mn>0.11</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></math> mass uncertainties accommodate either state within <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>1</mn><mi>σ</mi></math> of all four currents, so this current-to-state mapping is adopted only as an auxiliary phenomenological choice. The predicted magnitudes <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">|</mo><mi>μ</mi><mo stretchy="false">|</mo><mo>∼</mo><mn>1</mn><mi>–</mi><mn>3</mn><msub><mi>μ</mi><mi>N</mi></msub></math> lie systematically above quark-model and heavy pentaquark chiral perturbation theory expectations (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">|</mo><mi>μ</mi><mo stretchy="false">|</mo><mo>≲</mo><mn>0.5</mn><msub><mi>μ</mi><mi>N</mi></msub></math>). Applying the same flavor-decomposition procedure to two previous molecular LCSR analyses of the same states yields <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>μ</mi><mi>u</mi></msub><mo>/</mo><msub><mi>μ</mi><mi>d</mi></msub><mo>=</mo><mo>−</mo><mn>1</mn><mo>/</mo><mn>2</mn></math> rather than <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>−</mo><mn>2</mn></math>, providing an LCSR-internal contrast that operates at the flavor-decomposed level even when total magnitudes are comparable. Crucially, the two analytic signatures identified here are immune to the ambiguity of the state-to-current pairing and therefore offer falsifiable tests of the compact picture that survive the unavoidable phenomenological assumptions of mass-based assignments.

Türkiye

Ulaş Özdem

Analytic electromagnetic signatures of compact pentaquark structure: A multicurrent QCD light-cone sum rules analysis of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>P</mi><mrow><mi>ψ</mi><mi>s</mi></mrow><mi mathvariant="normal">Λ</mi></msubsup></math> states

We report a new measurement of transverse single-spin asymmetries for dijet production in collisions of polarized protons at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mrow><mn>200</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></mrow></math>. Correlations between the proton spin and the transverse momenta of its partons, each perpendicular to the proton momentum direction, are probed at high <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>Q</mi><mn>2</mn></msup><mo>≈</mo><mn>160</mn><mtext> </mtext><mtext> </mtext><msup><mi>GeV</mi><mn>2</mn></msup></math>. Evidence for nonzero Sivers effects is measured for the first time in dijets from proton-proton collisions, but only when the jets are sorted by their net charge, which enhances the otherwise canceling opposite-sign <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>u</mi></math>- or <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>d</mi></math>-quark contributions to separate data samples. The resulting asymmetries are compared to recent theoretical calculations. Separately, the associated Sivers observable <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">⟨</mo><msub><mi>k</mi><mi>T</mi></msub><mo stretchy="false">⟩</mo></math>, the average parton transverse momentum, is extracted using a simple kinematics approach which further enables a determination of the individual partonic contributions to the observed asymmetries.

B.E. Aboona

Czechia

J. Adam

JINR

G. Agakishiev

India

I. Aggarwal

M.M. Aggarwal

Z. Ahammed

A. Aitbayev

I. Alekseev

E. Alpatov

A.K. Alshammri

E.C. Aschenauer

A. Aparin

S. Aslam

J. Atchison

G.S. Averichev

Chile

V. Bairathi

X. Bao

P. Barik

K. Barish

S. Behera

P. Bhagat

A. Bhasin

S. Bhatta

I.G. Bordyuzhin

J.D. Brandenburg

A.V. Brandin

C. Broodo

X.Z. Cai

H. Caines

M. Calderón de la Barca Sánchez

D. Cebra

J. Ceska

I. Chakaberia

Y.S. Chang

Z. Chang

A. Chatterjee

D. Chen

J.H. Chen

China

L. Chen

Q. Chen

W. Chen

Z. Chen

J. Cheng

Y. Cheng

W. Christie

X. Chu

S. Corey

H.J. Crawford

G. Dale-Gau

A. Das

D. De Souza Lemos

T.G. Dedovich

Germany

I.M. Deppner

A.A. Derevschikov

A. Deshpande

A. Dhamija

A. Dimri

P. Dixit

X. Dong

J.L. Drachenberg

E. Duckworth

J.C. Dunlop

Egypt

Y.S. El-Feky

J. Engelage

G. Eppley

Japan

S. Esumi

O. Evdokimov

O. Eyser

B. Fan

Y. Fang

R. Fatemi

Italy

S. Fazio

H. Feng

Y. Feng

E. Finch

Y. Fisyak

F.A. Flor

B. Fu

C. Fu

T. Fu

T. Gao

Y. Gao

G. Garcia

F. Geurts

A. Gibson

A. Giri

K. Gopal

M. Gordon

X. Gou

D. Grosnick

A. Gu

J. Gu

A. Gupta

A. Hamed

R.J. Hamilton

J. Han

X. Han

M.D. Harasty

J.W. Harris

H. Harrison-Smith

Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>200</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></math>

The non-leptonic $\textit{D}$ → $\textit{K}$ $\textit{K}$ and $\textit{D}$ → $\textit{π}$ $\textit{π}$ decays are powerful probes of the Standard Model and are related to each other through the $\textit{U}$ -spin symmetry of the strong interaction. Using lattice QCD inputs we calculate the corresponding colour-allowed tree amplitudes in factorisation and demonstrate that non-factorisable contributions and $\textit{U}$ -spin-breaking effects at the level of 50% allow us to accommodate the measured branching ratios in the Standard Model. An exciting direct probe of such non-factorisable and $\textit{U}$ -spin breaking effects is provided by the $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ channel. This decay is governed by non-factorisable exchange topologies and essentially vanishes in the $\textit{U}$ -spin limit, although it is experimentally well established with a prominent branching ratio. Extrapolating our $\textit{D}$ → $\textit{K}$ $\textit{K}$ results using the isospin symmetry, we find a consistent benchmark picture. Specifically, we can accommodate the measured $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ branching ratio with $\textit{U}$ -spin-breaking effects at the 50% level and exchange amplitudes at the level of 50% of the colour-allowed $\textit{D}$ → $\textit{K}$ $\textit{K}$ , $\textit{D}$ → $\textit{π}$ $\textit{π}$ tree contributions. Finally, we explore the resulting range for direct CP violation in $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ , obtaining upper bounds in our benchmark scenarios of a few per mille, offering an exciting target for future measurements.

Netherlands

Robert Fleischer

Maria Piscopo

K. Vos

B. Zubaroğlu

Standard model benchmarks for $\textit{D}$ 0 → $\textit{K}$ − $\textit{K}$ +, $\textit{π}$ − $\textit{π}$ +, $$ {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ decays

We study the semileptonic decays <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>B</mi><mi>s</mi></msub><mo stretchy="false">→</mo><msubsup><mi>D</mi><mi>s</mi><mrow><mo stretchy="false">(</mo><mo>*</mo><mo stretchy="false">)</mo></mrow></msubsup><mi>τ</mi><mover accent="true"><mi>ν</mi><mo stretchy="false">¯</mo></mover></math> as a promising probe for new physics (NP) beyond the standard model (SM). The extension of the SM is done through the introduction of four-fermion operators beyond the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>V</mi><mo>−</mo><mi>A</mi></math> structure with the corresponding Wilson coefficients characterizing their contribution. The constraints on these coefficients are obtained from recent experimental data. Form factors describing hadron transitions are calculated in our covariant quark model with infrared confinement. Theoretical predictions for the full set of observables in these channels are provided. We analyze possible NP effects to be tested in future experiments.

M.A. Ivanov

J.N. Pandya

P. Santorelli

N.R. Soni

Vietnam

C.T. Tran

H.C. Tran

Vo Quoc Phong

Detailed analysis of possible new-physics effects in the semileptonic decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>B</mi><mi>s</mi></msub><mo stretchy="false">→</mo><msubsup><mi>D</mi><mi>s</mi><mrow><mo stretchy="false">(</mo><mo>*</mo><mo stretchy="false">)</mo></mrow></msubsup><mi>τ</mi><mover accent="true"><mi>ν</mi><mo stretchy="false">¯</mo></mover></math>

This paper presents a detailed description of a model-independent method for the direct measurement of the Υ(4$\textit{S}$) → $\textit{B}$ $\textit{B}$ and Υ(4$\textit{S}$) → $$ {B}^0{\overline{B}}^0 $$ production fractions at $\textit{B}$ factories. The method is based on counting single- and double-inclusive charmed meson production at the Υ(4$\textit{S}$) resonance, providing statistical tagging of $$ {B}^0{\overline{B}}^0 $$ and $\textit{B}$ $\textit{B}$ events. A feasibility study indicates that a precision comparable to the current world average can be achieved without making any underlying assumptions, as the calculations rely solely on event yields.

Russia

M. Yasaveev

P. Pakhlov

N. Peters

A. Mufazalova

A model independent method for measurement of $\textit{B}$ ± and $\textit{B}$ 0 meson production fractions at Υ(4$\textit{S}$)

The strongly-coupled 3-dimensional theory, holographically dual to black branes at fixed chemical potential $\textit{μ}$ and temperature $\textit{T}$ ≪ $\textit{μ}$ is considered in AdS Einstein-Maxwell theory. The retarded Green’s functions at frequency $\textit{ω}$ is calculated using holography in the regime $\textit{ω}$, $\textit{T}$ ≪ $\textit{μ}$ but otherwise arbitrary. When the transverse space has finite volume, there is a non-zero energy scale $\textit{E}$ , scaling as 1/$\textit{μ}$ for large $\textit{μ}$, below which quantum-gravitational corrections due to the fluctuations of the nearly-gapless Schwarzian modes become important. Such corrections to the retarded Green’s function are calculated at different relative values of $\textit{ω}$, $\textit{T}$, and $\textit{E}$ . The $\textit{ω}$ → 0 limit is used to define the shear viscosity $\textit{η}$. As the temperature is lowered below $\textit{μ}$, quantum corrections are found to increase the value of $\textit{η}$ with respect to its semiclassical value. The quantum-corrected result for $\textit{η}$ diverges as $$ \sqrt{{\mathrm{E}}_{\mathrm{gap}}/T} $$ at $\textit{T}$ ≪ $\textit{E}$ , in accord with corresponding results for the absorption cross section. The quantum result for the ratio $\textit{η}$/$\textit{s}$, where $\textit{s}$ is the entropy density, dips below the semiclassical limit of 1/4$\textit{π}$ when $\textit{E}$ ≪ $\textit{T}$ ≪ $\textit{μ}$, then turns back to increase towards lower temperatures, and finally diverges at temperatures much below $\textit{E}$ .

Greece

Alexandros Kanargias

France

Elias Kiritsis

United Kingdom

Sameer Murthy

Olga Papadoulaki

Achilleas Porfyriadis

Holographic shear correlators at low temperatures, and quantum $\textit{η}$/$\textit{s}$

We report on the first measurement of the Central Exclusive Production process in proton-proton collisions: $\textit{pp}$ → $\textit{ph}$ $\textit{h}$ $\textit{p}$ (where $\textit{h}$ = $\textit{π}$, $\textit{K}$, $\textit{p}$) at the center-of-mass energy $$\sqrt{s}=510$$ GeV with the STAR experiment at RHIC. At this energy, the process is dominated by a double Pomeron exchange mechanism. Hence, it provides a clean environment for investigating Pomeron interactions by measuring fully reconstructed final states involving only two hadrons and two forward scattered protons. The oppositely charged hadron pairs are measured within the central detector of STAR. The forward scattered protons are measured in the Roman Pot system allowing the verification of the event’s exclusivity. Differential fiducial cross sections within the STAR acceptance are presented as a function of the difference in the azimuthal angle between the outgoing protons. The invariant masses of the charged hadron pairs are measured up to approximately 3 GeV and the square of the four-momentum transfer ($\textit{t}$ and $\textit{t}$ ) of the two forward-scattered protons in the range 0.3 GeV < −$\textit{t}$ , −$\textit{t}$ < 1.6 GeV . The differential fiducial cross sections of the forward protons as a function of the |$\textit{t}$ + $\textit{t}$ | are also presented. All results for the $\textit{π}$ $\textit{π}$ pair are presented in three mass ranges. A comparison with GRANIITTI Monte Carlo predictions are also presented, where the spectra include continuum and resonant contributions. The observed spectra are consistent with double Pomeron exchange, including resonances seen in previous studies.

United States

B. Aboona

Poland

L. Adamczyk

M. Aggarwal

A. Alshammri

E. Aschenauer

R. Bellwied

S. Bhosale

J. Bielcik

J. Bielcikova

J. Brandenburg

X. Cai

M. Calderon de la Barca Sanchez

P. Chaloupka

Y. Chang

J. Chen

H. Crawford

Hungary

M. Csanad

D. Souza Lemos

I. Deppner

J. Drachenberg

J. Dunlop

Y. El-Feky

F. Flor

C. Gagliardi

T. Galatyuk

 Gao

W. Guryn

R. Hamilton

S. Harabasz

M. Harasty

J. Harris

Study of Central Exclusive Production of $\textit{π}$ + $\textit{π}$ $\textit{−}$ , $\textit{K}$ + $\textit{K}$ $\textit{−}$ and $$p\overline{p }$$ pairs in proton-proton collisions at $$\sqrt{s}=510$$ GeV with the STAR detector at RHIC

A search is presented for emerging jets using $$140~\textrm{fb}^{-1}$$ of proton–proton collision data at $$\sqrt{s} = 13~\textrm{TeV}$$ , collected by the ATLAS experiment between 2015 and 2018. The search looks for the existence of a dark sector with symmetries similar to those in quantum chromodynamics. This dark sector is populated with dark quarks, which undergo showering similar to quarks in the Standard Model, leading to a high multiplicity of long-lived dark hadrons within a dark jet. These dark hadrons subsequently decay to Standard Model particles via a new heavy scalar mediating particle $$\phi $$ . This results in jets which contain multiple displaced vertices, known as emerging jets. This analysis targets four-jet topologies, with two emerging jets and two Standard Model jets, resulting from the decay of pair-produced scalar mediators. No significant excess above the Standard Model background is observed. For dark pion proper decay lengths of $$20~\textrm{mm}$$ , mediator masses are excluded between 1 and $$2~\textrm{TeV}$$ assuming a dark pion mass of $$20~\textrm{GeV}$$ .

G. Aad

Norway

E. Aakvaag

B. Abbott

United Arab Emirates

S. Abdelhameed

K. Abeling

N. Abicht

S. Abidi

M. Aboelela

Morocco

A. Aboulhorma

Israel

H. Abramowicz

Y. Abulaiti

Search for emerging jets in $\textit{pp}$ collisions at $$\sqrt{s} = 13~\textrm{TeV}$$ with the ATLAS experiment