2025-04-22
15:54 |
Femtoscopic study of the proton-proton and proton-deuteron systems in heavy-ion collisions at the LHC
/ Acharya, Shreyasi (INFN, Bari) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) ; Akbar, Zulkaida (Jakarta LIPI, Indonesian Inst. Sci.) et al.
/ALICE
This work reports femtoscopy correlations of p$-$p (p$-$p) and p$-$d (p$-$d) pairs measured in Pb$-$Pb collisions at center-of-mass energy $\sqrt{s_{\rm NN}} = 5.02$ TeV by 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 as a function of the pair transverse mass ($m_{\rm T}$) and of the average charge particle multiplicity $\langle {\rm d}N_{\rm ch}/{\rm d}\eta \rangle^{1/3}$ for three centrality intervals (0$-$10%, 10$-$30%, 30$-$50%). [...]
arXiv:2505.01061; CERN-EP-2025-096.-
Geneva : CERN, 2025 - 25 p.
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2025-04-02
07:21 |
Long-range transverse momentum correlations and radial flow in Pb–Pb collisions at the LHC
/ Acharya, Shreyasi (INFN, Bari) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) ; Akbar, Zulkaida (Jakarta LIPI, Indonesian Inst. Sci.) et al.
/ALICE
This Letter presents measurements of long-range transverse-momentum correlations using a new observable, $v_0 ( p_{\rm T} )$, which serves as a probe of radial flow and medium properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, recorded by the ALICE detector. [...]
arXiv:2504.04796; CERN-EP-2025-084.-
Geneva : CERN, 2025 - 24 p.
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2025-04-01
07:01 |
D$^0$-meson-tagged jet axes difference in proton-proton collisions at $\sqrt{s }= 5.02$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
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 non-perturbative QCD on jet formation and structure. [...]
arXiv:2504.02571; CERN-EP-2025-083.-
Geneva : CERN, 2025 - 29 p.
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2025-04-01
06:52 |
Energy–energy correlators in charm-tagged jets in proton–proton collisions at $\sqrt{s} = 13$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
/ALICE
In this letter, we present the first measurement of the energy–energy correlator (EEC) in charm-tagged jets from proton–proton (pp) collisions at $\sqrt{s} = 13$ TeV. EECs probe the structure of QCD radiation, providing a unique test of mass-dependent effects in parton showers involving a charm quark and offering a distinct view into non-perturbative phenomena, including the hadronization process [...]
arXiv:2504.03431; CERN-EP-2025-082.-
Geneva : CERN, 2025 - 20 p.
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2025-03-31
15:12 |
Revealing the microscopic mechanism of deuteron formation at the LHC
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
/ALICE
The formation of light (anti)nuclei with mass number A of few units (e.g., d, $^3$He, and $^4$He) in high-energy hadronic collisions presents a longstanding mystery in nuclear physics [1, 2]. It is not clear how nuclei bound by a few MeV can emerge in environments characterized by temperatures above 100 MeV [3–5], about 100,000 times hotter than the center of the Sun [...]
arXiv:2504.02393; CERN-EP-2025-081.-
Geneva : CERN, 2025 - 27 p.
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2025-03-31
14:44 |
First observation of ultra-long-range azimuthal correlations in low multiplicity pp and p–Pb collisions at the LHC
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
/ALICE
This study presents the first observation of ultra-long-range two-particle azimuthal correlations with pseudorapidity separation of $|\Delta \eta| > 5.0$ in proton–proton (pp) andf $|\Delta \eta| > 6.5$ in proton–lead (p–Pb) collisions at the LHC, down to and below the minimum-bias multiplicity. Two-particle correlation coefficients ($V_{2\Delta}$) are measured after removing non-flow (jets and resonance decays) contributions using the template-fit method across various multiplicity classes, providing novel insights into the origin of long-range correlations in small systems [...]
arXiv:2504.02359; CERN-EP-2025-080.-
Geneva : CERN, 2025 - 18 p.
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2025-03-27
13:35 |
Accessing the deuteron source with pion–deuteron femtoscopy in Pb–Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
Femtoscopy of non-identical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pairs, providing direct access to the characteristics of the single-particle source. [...]
arXiv:2504.02333; CERN-EP-2025-075.-
Geneva : CERN, 2025 - 26 p.
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2025-03-26
16:33 |
Centrality dependence of charged-particle pseudorapidity density at midrapidity in Pb-Pb collisions at $\sqrt{\textit{s}_{\rm{NN}}} = 5.36$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
The ALICE Collaboration reports its first LHC Run 3 measurements of charged-particle pseudorapidity density at midrapidity in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV. Particle multiplicity in high-energy collisions characterises the system geometry, constrains particle-production mechanisms, and is used to estimate initial energy density. [...]
arXiv:2504.02505; CERN-EP-2025-073.-
Geneva : CERN, 2025 - 22 p.
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2025-03-26
11:39 |
First measurement of D$^{*+}$ vector spin alignment in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
The first measurement of prompt D$^{*+}$ meson spin alignment in ultrarelativistic heavy-ion collisions with respect to the direction orthogonal to the reaction plane is presented. The spin alignment is quantified by measuring the element $\rho_{00}$ of the diagonal spin-density matrix for prompt D$^{*+}$ mesons with $4 < p_{\rm T} < 30$ GeV/$c$ in two rapidity intervals, $|y| < 0.3$ and $0.3 < |y| < 0.8$, in central (0– 10%) and midcentral (30–50%) Pb–Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. [...]
arXiv:2504.00714; CERN-EP-2025-072.-
Geneva : CERN, 2025 - 24 p.
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2025-03-26
07:16 |
Multiplicity-dependent inclusive J/$\psi$ production at forward rapidity in pp collisions at $\sqrt{s} = 13$ TeV
/ Acharya, Shreyasi (INFN, Bari) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
This paper presents a study of the inclusive forward J/$\psi$ yield as a function of forward charged-particle multiplicity in pp collisions at $\sqrt{s} = 13$ TeV using data collected by the ALICE experiment at the CERN LHC. The results are presented in terms of relative J/ψ yields and relative charged-particle multiplicities with respect to these quantities obtained in inelastic collisions having at least one charged particle in the pseudorapidity range $|\eta| < 1$. [...]
arXiv:2504.00686; CERN-EP-2025-070.-
Geneva : CERN, 2025 - 21 p.
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