Heavy-flavor quarks produced in proton-proton (pp) collisions provide a unique opportunity to investigate the evolution of quark-initiated parton showers from initial hard scatterings to final-state hadrons. By examining jets that contain heavy-flavor hadrons, this study explores the effects of both perturbative and nonperturbative QCD on jet formation and structure. The angular differences between various jet axes, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Δ</mi><msub><mi>R</mi><mrow><mi>axis</mi></mrow></msub></math>, offer insight into the radiation patterns and fragmentation of charm quarks. The first measurement of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math>-tagged jet axes differences in pp collisions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>5.02</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> by the ALICE experiment at the LHC is presented for jets with transverse momentum <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>p</mi><mi mathvariant="normal">T</mi><mtext>ch jet</mtext></msubsup><mo>≥</mo><mn>10</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> mesons with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msubsup><mrow><mi>p</mi></mrow><mrow><mi mathvariant="normal">T</mi></mrow><mrow><msup><mrow><mi mathvariant="normal">D</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></msubsup><mo>≥</mo><mn>5</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></mrow></math>. In this <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math>-meson-tagged jet measurement, three jet axis definitions, each with different sensitivities to soft, wide-angle radiation, are used: the standard axis, soft drop groomed axis, and winner-takes-all axis. Measurements of the radial distributions of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> mesons with respect to the jet axes, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">Δ</mi><msub><mrow><mi>R</mi></mrow><mrow><mrow><mi>axis</mi></mrow><mtext>−</mtext><msup><mrow><mi mathvariant="normal">D</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></msub></mrow></math>, are reported, along with the angle, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Δ</mi><msub><mi>R</mi><mrow><mi>axis</mi></mrow></msub></math>, between the three jet axes. The <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> meson emerges as the leading particle in these jets, closely aligning with the winner-takes-all axis and diverging from the standard jet axis. The results also examine how varying the sensitivity to soft radiation with grooming influences the orientation of the soft drop jet axis and uncover that charm-jet structure is more likely to survive grooming when the soft drop axis is further from the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> direction, providing further evidence of the dead-cone effect recently measured by ALICE.

Italy

S. Acharya

India

A. Agarwal

CERN

G. Aglieri Rinella

L. Aglietta

M. Agnello

N. Agrawal

Z. Ahammed

S. Ahmad

South Korea

S.U. Ahn

Slovakia

I. Ahuja

A. Akindinov

Germany

V. Akishina

M. Al-Turany

D. Aleksandrov

B. Alessandro

China

H.M. Alfanda

Mexico

R. Alfaro Molina

B. Ali

A. Alici

United States

N. Alizadehvandchali

A. Alkin

Norway

J. Alme

G. Alocco

T. Alt

A.R. Altamura

I. Altsybeev

J.R. Alvarado

M.N. Anaam

Romania

C. Andrei

United Kingdom

N. Andreou

A. Andronic

E. Andronov

V. Anguelov

F. Antinori

P. Antonioli

N. Apadula

H. Appelshäuser

France

C. Arata

S. Arcelli

R. Arnaldi

Brazil

J.G.M.C.A. Arneiro

I.C. Arsene

M. Arslandok

A. Augustinus

R. Averbeck

D. Averyanov

M.D. Azmi

Japan

H. Baba

A. Badalà

J. Bae

Y. Bae

Y.W. Baek

X. Bai

R. Bailhache

Y. Bailung

R. Bala

A. Baldisseri

Poland

B. Balis

S. Bangalia

Z. Banoo

V. Barbasova

F. Barile

L. Barioglio

Greece

M. Barlou

B. Barman

Hungary

G.G. Barnaföldi

L.S. Barnby

E. Barreau

V. Barret

L. Barreto

K. Barth

E. Bartsch

N. Bastid

Sweden

S. Basu

G. Batigne

D. Battistini

B. Batyunya

D. Bauri

Peru

J.L. Bazo Alba

Denmark

I.G. Bearden

P. Becht

D. Behera

I. Belikov

A.D.C. Bell Hechavarria

F. Bellini

R. Bellwied

S. Belokurova

L.G.E. Beltran

Y.A.V. Beltran

G. Bencedi

A. Bensaoula

S. Beole

Y. Berdnikov

A. Berdnikova

L. Bergmann

L. Bernardinis

L. Betev

P.P. Bhaduri

T. Bhalla

A. Bhasin

<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup></math>-meson-tagged jet axes difference in proton-proton collisions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>5.02</mn></mrow><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>

We report on a search for axion dark matter in the frequency range near 5.9 GHz, conducted using the haloscope technique. The experiment employed an 8-cell microwave resonator designed to extend the accessible frequency range by a multifold factor relative to conventional single-cell configurations, while maintaining a large detection volume. To enhance sensitivity, a flux-driven Josephson parametric amplifier operating near the quantum noise limit was utilized, together with a sideband-summing method that coherently combines mirrored spectral components generated by the Josephson parametric amplifier. Data were acquired over the frequency range 5.83–5.94 GHz. With no statistically significant excess observed, we exclude axion-photon couplings <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>g</mi></mrow><mrow><mi>a</mi><mi>γ</mi><mi>γ</mi></mrow></msub></mrow></math> down to <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>1.2</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>14</mn></mrow></msup><mtext> </mtext><mtext> </mtext><mrow><msup><mrow><mi>GeV</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></mrow></math> at a 90% confidence level. The achieved sensitivity approaches the Kim-Shifman-Vainshtein-Zakharov benchmark prediction, setting the most stringent limits to date in this range.

Saebyeok Ahn

Çağlar Kutlu

Soohyung Lee

SungWoo Youn

Sergey V. Uchaikin

Sungjae Bae

Junu Jeong

Arjan F. van Loo

Yasunobu Nakamura

Seongjeong Oh

Jihn E. Kim

Yannis K. Semertzidis

Probing Kim-Shifman-Vainshtein-Zakharov Axion Dark Matter near 5.9 GHz Using an 8-Cell Cavity Haloscope

The intense photon fluxes from relativistic nuclei provide an opportunity to study photonuclear interactions in ultraperipheral collisions. In particular, it allows for the investigations of excited, light-flavour vector mesons. The measurement of coherently photoproduced <math altimg='si6.svg'><mrow><msup><mi>&#960;</mi><mo>+</mo></msup><msup><mi>&#960;</mi><mo>&#8722;</mo></msup><msup><mi>&#960;</mi><mo>+</mo></msup><msup><mi>&#960;</mi><mo>&#8722;</mo></msup></mrow></math> final states in ultraperipheral Pb&#8211;Pb collisions at <math altimg='si7.svg'><mrow><msqrt><msub><mi>s</mi><mtext>NN</mtext></msub></msqrt><mspace width='0.33em' /><mo linebreak='goodbreak'>=</mo><mspace width='0.33em' /><mn>5.02</mn></mrow></math> TeV is presented for the first time. The cross section, d <italic>&#963;</italic>/d <italic>y</italic>, times the branching ratio ( <math altimg='si8.svg'><mrow><mi>&#961;</mi><mo>&#8594;</mo><msup><mi>&#960;</mi><mo>+</mo></msup><msup><mi>&#960;</mi><mo>+</mo></msup><msup><mi>&#960;</mi><mo>&#8722;</mo></msup><msup><mi>&#960;</mi><mo>&#8722;</mo></msup></mrow></math>) is found to be 47.8&#8239;&#177;&#8239;2.3&#8201;(stat.)&#8239;&#177;&#8239;7.7&#8201;(syst.) mb in the rapidity interval | <italic>y</italic>|&#8239;&lt;&#8239;0.5. The invariant mass distribution is not well described with a single Breit-Wigner resonance without an interference term. Including interference with a non-resonant contribution results in the mass and width values being too far from those reported in PDG, while the production of two interfering resonances, <italic>&#961;</italic>(1450) and <italic>&#961;</italic>(1700), also provides a good description of the data. The values of the masses ( <italic>m</italic>) and widths (&#915;) of the resonances extracted from the fit assuming two interfering resonances are <math altimg='si9.svg'><mrow><msub><mi>m</mi><mn>1</mn></msub><mo linebreak='goodbreak'>=</mo><mn>1385</mn><mo>&#177;</mo><mn>14</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>stat</mtext><mo>.</mo><mo>)</mo></mrow><mo>&#177;</mo><mn>3</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>syst</mtext><mo>.</mo><mo>)</mo></mrow></mrow></math> MeV/ <italic>c</italic> 2, <math altimg='si10.svg'><mrow><msub><mstyle mathvariant='normal'><mi>&#915;</mi></mstyle><mn>1</mn></msub><mo linebreak='goodbreak'>=</mo><mn>431</mn><mo>&#177;</mo><mn>36</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>stat</mtext><mo>.</mo><mo>)</mo></mrow><mo>&#177;</mo><mn>82</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>syst</mtext><mo>.</mo><mo>)</mo></mrow></mrow></math> MeV/ <italic>c</italic> 2, <math altimg='si11.svg'><mrow><msub><mi>m</mi><mn>2</mn></msub><mo linebreak='goodbreak'>=</mo><mn>1663</mn><mo>&#177;</mo><mn>13</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>stat</mtext><mo>.</mo><mo>)</mo></mrow><mo>&#177;</mo><mn>22</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>syst</mtext><mo>.</mo><mo>)</mo></mrow></mrow></math> MeV/ <italic>c</italic> 2 and <math altimg='si12.svg'><mrow><msub><mstyle mathvariant='normal'><mi>&#915;</mi></mstyle><mn>2</mn></msub><mo linebreak='goodbreak'>=</mo><mn>357</mn><mspace width='0.33em' /><mo>&#177;</mo><mn>31</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>stat</mtext><mo>.</mo><mo>)</mo></mrow><mo>&#177;</mo><mn>49</mn><mspace width='0.33em' /><mrow><mo mathvariant='normal'>(</mo><mtext>syst</mtext><mo>.</mo><mo>)</mo></mrow></mrow></math> MeV/ <italic>c</italic> 2, respectively. The measured cross sections times the branching ratios are compared to recent theoretical predictions.

Czechia

D. Adamová

Switzerland

L. Aphecetche

H. Appelsh

M. Aresti

A. Badal

A. Balbino

D. Banerjee

G.G. Barnaf

C. Bartels

C. Beattie

M.G. Besoiu

Exclusive photoproduction of excited <italic>&#961;</italic> mesons decaying to four pions in ultraperipheral Pb&#8211;Pb collisions at <math altimg='si5.svg'><mrow><msqrt><msub><mtext mathvariant='bold-italic'>s</mtext><mtext>NN</mtext></msub></msqrt><mo linebreak='goodbreak'>=</mo><mn mathvariant='bold'>5</mn><mo>.</mo><mn mathvariant='bold'>02</mn></mrow></math> TeV

A signal consistent with the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Ω</mi><mo stretchy="false">(</mo><mn>2012</mn><mo stretchy="false">)</mo></math> baryon has been observed with a significance of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>15</mn><mi>σ</mi></math> in pp collisions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> at the LHC. In this paper, the analysis technique is described and measurements of the mass and width of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Ω</mi><mo stretchy="false">(</mo><mn>2012</mn><mo stretchy="false">)</mo></math> are reported, along with the first measurement of its transverse-momentum spectrum and yield. This paper corroborates the observation by the Belle Collaboration of this excited <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Ω</mi></math> state and the observation that the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Ω</mi><mo stretchy="false">(</mo><mn>2012</mn><mo stretchy="false">)</mo></math> has a rather narrow width for a strongly decaying resonance. The yield measurement is combined with a statistical thermal model calculation of strange baryon yield ratios to obtain estimates of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">Ω</mi><mo stretchy="false">(</mo><mn>2012</mn><msup><mo stretchy="false">)</mo><mo>−</mo></msup></mrow><mo stretchy="false">→</mo><mi mathvariant="normal">Ξ</mi><mover accent="true"><mi mathvariant="normal">K</mi><mo stretchy="false">¯</mo></mover></math> branching ratios. These results will improve our understanding of the internal structure and mass spectrum of excited baryon states and serve as a baseline for searches regarding modifications of these properties in high-temperature media.

Observation of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">Ω</mi><mo stretchy="false">(</mo><mn>2012</mn><mo stretchy="false">)</mo></mrow></math> baryon at the LHC

The coherent J/ <italic>&#968;</italic> photoproduction cross section is measured for the first time at midrapidity in peripheral to semicentral <math altimg='si1.svg'><mrow><mrow><mrow><mi mathvariant='normal'>P</mi></mrow><mi>b</mi></mrow><mo linebreak='goodbreak'>&#8722;</mo><mrow><mrow><mi mathvariant='normal'>P</mi></mrow><mi>b</mi></mrow></mrow></math> collisions at <math altimg='si2.svg'><mrow><msqrt><msub><mi>s</mi><mtext>NN</mtext></msub></msqrt><mo linebreak='goodbreak'>=</mo><mn>5.02</mn></mrow></math> TeV. The centrality differential cross section d <italic>&#963;</italic>/d <italic>y</italic> is reported for the centrality range 40&#8211;90%, together with the doubly-differential cross section d 2 <italic>&#963;</italic>/d <italic>y</italic>d <italic>p</italic> <inf>T</inf>, extracted in two peripheral centrality classes. The J/ <italic>&#968;</italic> mesons are reconstructed in the dielectron channel, in the rapidity interval | <italic>y</italic>|&#8239;&lt;&#8239; 0.9 using the ALICE central barrel detectors. The J/ <italic>&#968;</italic> cross section at midrapidity is statistically compatible to the earlier ALICE measurement at forward rapidity and at the same centre-of-mass energy, and shows only a mild centrality dependence over the covered range. Several sets of theoretical calculations taking into account the hadronic overlap in the collisions but ignoring possible final-state effects from a hot expanding medium are found to give a fairly good description of the current measurements within uncertainties.

C.O.R. Alvarez

J.L.Bazo Alba

Coherent J/ <italic>&#968;</italic> photoproduction at midrapidity in <math altimg='si1.svg'><mrow><mrow><mrow><mi mathvariant='normal'>P</mi></mrow><mi>b</mi></mrow><mo linebreak='goodbreak'>&#8722;</mo><mrow><mrow><mi mathvariant='normal'>P</mi></mrow><mi>b</mi></mrow></mrow></math> collisions at <math altimg='si3.svg'><mrow><msqrt><msub><mi>s</mi><mrow><mrow><mi mathvariant='normal'>N</mi></mrow><mi>N</mi></mrow></msub></msqrt><mo linebreak='goodbreak'>=</mo><mn>5.02</mn></mrow></math> TeV

This work reports femtoscopic correlations of <math altimg='si18.svg'><mrow><mrow><mi mathvariant='normal'>p</mi></mrow><mrow><mo mathvariant='normal'>-</mo><mo>&#8722;</mo></mrow><mrow><mi mathvariant='normal'>p</mi></mrow><mspace width='0.33em' /><mo>(</mo><mrow><mover><mrow><mi mathvariant='normal'>p</mi></mrow><mo stretchy='true'>&#8254;</mo></mover></mrow><mrow><mo mathvariant='normal'>-</mo><mo>&#8722;</mo></mrow><mrow><mover><mrow><mi mathvariant='normal'>p</mi></mrow><mo stretchy='true'>&#8254;</mo></mover></mrow><mo>)</mo></mrow></math> and <math altimg='si19.svg'><mrow><mrow><mi mathvariant='normal'>p</mi><mo linebreak='badbreak'>&#8722;</mo><mo>&#8722;</mo><mi mathvariant='normal'>d</mi></mrow><mspace width='0.33em' /><mo>(</mo><mrow><mover><mrow><mi mathvariant='normal'>p</mi></mrow><mo stretchy='true'>&#8254;</mo></mover></mrow><mrow><mo mathvariant='normal'>-</mo><mo>&#8722;</mo></mrow><mrow><mover><mrow><mi mathvariant='normal'>d</mi></mrow><mo stretchy='true'>&#8254;</mo></mover></mrow><mo>)</mo></mrow></math> pairs measured in Pb&#8211;Pb collisions at center-of-mass energy per nucleon <math altimg='si20.svg'><msqrt><msub><mi>s</mi><mrow><mrow><mi mathvariant='normal'>N</mi></mrow><mi>N</mi></mrow></msub></msqrt></math> = 5.02 TeV in the ALICE Collaboration. A fit to the measured proton-proton correlation functions allows one to extract the dependence of the nucleon femtoscopic radius of the particle-emitting source on the pair transverse mass ( <math altimg='si3.svg'><msub><mi>m</mi><mtext>T</mtext></msub></math>) and on the average charge particle multiplicity <math altimg='si7.svg'><msup><mrow><mo>&#9001;</mo><msub><mtext>dN</mtext><mtext>ch</mtext></msub><mo>/</mo><mtext>d</mtext><mi>&#951;</mi><mo>&#9002;</mo></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup></math> for three centrality intervals (0&#8211;10 <math altimg='si21.svg'><mrow><mo>%</mo><mo>,</mo><mn>10</mn><mo linebreak='goodbreak'>&#8722;</mo><mo>&#8722;</mo><mn>30</mn><mspace width='0.16em' /><mo>%</mo><mo>,</mo><mn>30</mn><mo linebreak='goodbreak'>&#8722;</mo><mo>&#8722;</mo><mn>50</mn></mrow></math>%). In both cases, the expected power-law and linear scalings are observed, respectively. The measured p&#8211;d correlations can be described by both two- and three-body calculations, indicating that the femtoscopy observable is not sensitive to the short-distance features of the dynamics of the p-(p-n) system, due to the large inter-particle distances in Pb&#8211;Pb collisions at the LHC. Indeed, in this study, the minimum measured femtoscopic source sizes for protons and deuterons have a minimum value at <math altimg='si22.svg'><mrow><mn>2</mn><mo>.</mo><msubsup><mn>73</mn><mrow><mo>&#8722;</mo><mn>0.05</mn></mrow><mrow><mo>+</mo><mn>0.05</mn></mrow></msubsup></mrow></math> and <math altimg='si23.svg'><mrow><mn>3</mn><mo>.</mo><msubsup><mn>10</mn><mrow><mo>&#8722;</mo><mn>0.86</mn></mrow><mrow><mo>+</mo><mn>1.04</mn></mrow></msubsup></mrow></math> fm, respectively, for the 30&#8211;50% centrality collisions. Moreover, the <italic>m</italic> <inf>T</inf>-scaling obtained for the p&#8211;p and p&#8211;d systems is compatible within 1 <italic>&#963;</italic> of the uncertainties. These findings provide new input for fundamental studies on the production of light (anti)nuclei under extreme conditions.

Indonesia

Zul Akbar

V.D. Bella

B. Bhattacharjee

Femtoscopic study of the proton-proton and proton-deuteron systems in heavy-ion collisions at the LHC

Axions, originally proposed to resolve the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>C</mi><mi>P</mi></mrow></math> problem in the strong interaction, remain a leading dark matter candidate. While cavity haloscopes offer the most sensitive technique for detecting axions, searches have largely been limited to masses below <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>10</mn><mtext> </mtext><mtext> </mtext><mi>μeV</mi></mrow></math>. We report a sensitive search for axion dark matter with masses around <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>21</mn><mtext> </mtext><mtext> </mtext><mi>μeV</mi></mrow></math>, utilizing the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>TM</mi></mrow><mrow><mn>020</mn></mrow></msub></mrow></math> mode of a cylindrical cavity equipped with an innovative tuning mechanism. Our search achieved a sensitivity of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>1.7</mn><mo>×</mo></math> the Kim-Shifman-Vainshtein-Zakharov benchmark over a 100-MHz range, representing a significant advance in this mass range. These results demonstrate that higher-order modes provide a viable strategy for extending haloscope searches into previously unexplored higher-mass regions.

Younggeun Kim

Jinsu Kim

Seonjeong Oh

Taehyeon Seong

Sergey Uchaikin

Axion Dark Matter Search with Sensitivity near the Kim-Shifman-Vainshtein-Zakharov Benchmark Using the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>TM</mi></mrow><mrow><mn>020</mn></mrow></msub></mrow></math> Mode

The distribution of angular correlations between prompt charm hadrons and primary charged particles in pp collisions is sensitive to the charm-quark hadronisation process. In this letter, charm-baryon correlations are measured for the first time by studying the azimuthal-angle difference between charged particles and prompt <math altimg='si1.svg'><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup></math> baryons produced in pp collisions at a centre-of-mass energy of <math altimg='si2.svg'><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak='goodbreak' linebreakstyle='after'>=</mo><mn>13</mn></math> TeV, with the ALICE detector. <math altimg='si1.svg'><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup></math> baryons are reconstructed at midrapidity ( <math altimg='si5.svg'><mo stretchy='false'>|</mo><mi>y</mi><mo stretchy='false'>|</mo><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>0.5</mn></math>) in the transverse-momentum interval <math altimg='si6.svg'><mn>3</mn><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><msub><mrow><mi>p</mi></mrow><mrow><mtext>T</mtext></mrow></msub><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>16</mn></math> GeV/ <italic>c</italic>, and correlated with charged particles with <math altimg='si7.svg'><msub><mrow><mi>p</mi></mrow><mrow><mtext>T</mtext></mrow></msub><mo linebreak='goodbreak' linebreakstyle='after'>&gt;</mo><mn>0.3</mn></math> GeV/ <italic>c</italic> and pseudorapidity <math altimg='si8.svg'><mo stretchy='false'>|</mo><mi>&#951;</mi><mo stretchy='false'>|</mo><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>0.8</mn></math>. For <math altimg='si9.svg'><mn>3</mn><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><msubsup><mrow><mi>p</mi></mrow><mrow><mtext>T</mtext></mrow><mrow><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup><mo>,</mo><mtext>D</mtext></mrow></msubsup><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>5</mn></math> GeV/ <italic>c</italic>, the comparison with published measurements of D-meson and charged-particle correlations in the same collision system hints at a larger number of low-momentum particles associated with <math altimg='si1.svg'><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup></math>-baryon triggers than with D-meson triggers, both in the collinear and opposite directions with respect to the trigger particle. These differences can be quantified by the comparison of the properties of the near- and away-side correlation peaks, and are not reproduced by predictions of various Monte Carlo event generators, generally underpredicting the associated particle yields at <math altimg='si10.svg'><msubsup><mrow><mi>p</mi></mrow><mrow><mtext>T</mtext></mrow><mrow><mtext>assoc</mtext></mrow></msubsup><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>1</mn></math> GeV/ <italic>c</italic>. This tension between <math altimg='si1.svg'><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup></math>-baryon and D-meson associated peak yields could suggest a modified fragmentation of the charm quark, or a different hadronisation process, when a charm baryon is produced in the final state.

Studying charm hadronisation into baryons with azimuthal correlations of <math altimg='si1.svg'><msubsup><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mtext>c</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup></math> with charged particles in pp collisions at <math altimg='si2.svg'><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak='goodbreak' linebreakstyle='after'>=</mo><mn>13</mn></math> TeV

The jet cross section and jet-substructure observables in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>+</mo><mi>p</mi></math> 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> were measured by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC). Jets are reconstructed from charged-particle tracks and electromagnetic-calorimeter clusters using the anti-<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>k</mi><mi>t</mi></msub></math> algorithm with a jet radius of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>R</mi><mo>=</mo><mn>0.3</mn></math> for jets with transverse momentum within <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>8.0</mn><mo>&lt;</mo><msub><mi>p</mi><mi>T</mi></msub><mo>&lt;</mo><mn>40.0</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></math> and pseudorapidity <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">|</mo><mi>η</mi><mo stretchy="false">|</mo><mo>&lt;</mo><mn>0.15</mn></math>. Measurements include the jet cross section, as well as distributions of SoftDrop-groomed momentum fraction (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>z</mi><mi>g</mi></msub></math>), charged-particle transverse momentum with respect to jet axis (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>j</mi><mi>T</mi></msub></math>), and radial distributions of charged particles within jets (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>r</mi></math>). Also measured was the distribution of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>ξ</mi><mo>=</mo><mo>−</mo><mi>ln</mi><mo stretchy="false">(</mo><mi>z</mi><mo stretchy="false">)</mo></math>, where <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>z</mi></math> is the fraction of the jet momentum carried by the charged particle. The measurements are compared to theoretical next-to and next-to-next-to-leading-order calculations, the pythia and herwig event generators, and to other existing experimental results. Indicated from these measurements is a lower particle multiplicity in jets at RHIC energies when compared to models. Also noted are implications for future jet measurements with sPHENIX at RHIC as well as at the future Electron-Ion Collider.

N.J. Abdulameer

U. Acharya

C. Aidala

N.N. Ajitanand

Y. Akiba

R. Akimoto

J. Alexander

M. Alfred

V. Andrieux

Russia

S. Antsupov

K. Aoki

H. Asano

E.T. Atomssa

T.C. Awes

B. Azmoun

V. Babintsev

M. Bai

N.S. Bandara

B. Bannier

E. Bannikov

K.N. Barish

S. Bathe

V. Baublis

C. Baumann

S. Baumgart

A. Bazilevsky

Measurement of inclusive jet cross section and substructure in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>+</mo><mi>p</mi></math> 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>