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331 results on '"P. Bhattacharjee"'

1. Correlative X-ray micro-nanotomography with scanning electron microscopy at the Advanced Light Source

Author: Bhattacharjee, Arun J, Lisabeth, Harrison P, Parkinson, Dilworth, and MacDowell, Alastair
Subjects: Chemical Sciences, Physical Chemistry, Physical Sciences, Atomic, Molecular and Optical Physics, Condensed Matter Physics, Biomedical Imaging, X-ray tomography, scanning electron microscopy, basalt, serpentinite, energy-dispersive X-ray spectroscopy, Optical Physics, Physical Chemistry (incl. Structural), Biophysics, Physical chemistry, Atomic, molecular and optical physics, Condensed matter physics
Abstract: Geological samples are inherently multi-scale. Understanding their bulk physical and chemical properties requires characterization down to the nano-scale. A powerful technique to study the three-dimensional microstructure is X-ray tomography, but it lacks information about the chemistry of samples. To develop a methodology for measuring the multi-scale 3D microstructure of geological samples, correlative X-ray micro- and nanotomography were performed on two rocks followed by scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analysis. The study was performed in five steps: (i) micro X-ray tomography was performed on rock sample cores, (ii) samples for nanotomography were prepared using laser milling, (iii) nanotomography was performed on the milled sub-samples, (iv) samples were mounted and polished for SEM analysis and (v) SEM imaging and compositional mapping was performed on micro and nanotomography samples for complimentary information. Correlative study performed on samples of serpentine and basalt revealed multiscale 3D structures involving both solid mineral phases and pore networks. Significant differences in the volume fraction of pores and mineral phases were also observed dependent on the imaging spatial resolution employed. This highlights the necessity for the application of such a multiscale approach for the characterization of complex aggregates such as rocks. Information acquired from the chemical mapping of different phases was also helpful in segmentation of phases that did not exhibit significant contrast in X-ray imaging. Adoption of the protocol used in this study can be broadly applied to 3D imaging studies being performed at the Advanced Light Source and other user facilities.
Published: 2024

2. Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Alvarado, JR, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Aresti, M, Arnaldi, R, Arneiro, JGMCA, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Bae, J, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barile, F, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, Bielčíková, J, Biernat, J, and Bigot, AP
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy Ion Experiments, Jets, Particle Correlations and Fluctuations, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The azimuthal anisotropy of particles associated with jets (jet particles) at midrapidity is measured for the first time in p-Pb and Pb-Pb collisions at sNN = 5.02 TeV down to transverse momentum (pT) of 0.5 GeV/c and 2 GeV/c, respectively, with ALICE. The results obtained in p-Pb collisions are based on a novel three-particle correlation technique. The azimuthal anisotropy coefficient v2 in high-multiplicity p-Pb collisions is positive, with a significance reaching 6.8σ at low pT, and its magnitude is smaller than in semicentral Pb-Pb collisions. In contrast to the measurements in Pb-Pb collisions, the v2 coefficient is also found independent of pT within uncertainties. Comparisons with the inclusive charged-particle v2 and with AMPT calculations are discussed. The predictions suggest that parton interactions play an important role in generating a non-zero jet-particle v2 in p-Pb collisions, even though they overestimate the reported measurement. These observations shed new insights on the understanding of the origin of the collective behaviour of jet particles in small systems such as p-Pb collisions, and provide significant stringent new constraints to models.
Published: 2024

3. Measurements of long-range two-particle correlation over a wide pseudorapidity range in p–Pb collisions at sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altamura, AR, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, N, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Aresti, M, Arnaldi, R, Arneiro, JGMCA, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Baba, H, Badalà, A, Bae, J, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barile, F, Barioglio, L, Barlou, M, Barman, B, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Beltran, YAV, Bencedi, G, Beole, S, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Collective Flow, Heavy Ion Experiments, Particle Correlations and Fluctuations, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Correlations in azimuthal angle extending over a long range in pseudorapidity between particles, usually called the “ridge” phenomenon, were discovered in heavy-ion collisions, and later found in pp and p–Pb collisions. In large systems, they are thought to arise from the expansion (collective flow) of the produced particles. Extending these measurements over a wider range in pseudorapidity and final-state particle multiplicity is important to understand better the origin of these long-range correlations in small collision systems. In this Letter, measurements of the long-range correlations in p–Pb collisions at sNN = 5.02 TeV are extended to a pseudorapidity gap of ∆η ~ 8 between particles using the ALICE forward multiplicity detectors. After suppressing non-flow correlations, e.g., from jet and resonance decays, the ridge structure is observed to persist up to a very large gap of ∆η ~ 8 for the first time in p–Pb collisions. This shows that the collective flow-like correlations extend over an extensive pseudorapidity range also in small collision systems such as p–Pb collisions. The pseudorapidity dependence of the second-order anisotropic flow coefficient, v2(η), is extracted from the long-range correlations. The v2(η) results are presented for a wide pseudorapidity range of –3.1 < η < 4.8 in various centrality classes in p–Pb collisions. To gain a comprehensive understanding of the source of anisotropic flow in small collision systems, the v2(η) measurements are compared with hydrodynamic and transport model calculations. The comparison suggests that the final-state interactions play a dominant role in developing the anisotropic flow in small collision systems.
Published: 2024

4. Multiplicity and event-scale dependent flow and jet fragmentation in pp collisions at s = 13 TeV and in p–Pb collisions at sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altamura, AR, Altsybeev, I, Alvarado, JR, Anaam, MN, Andrei, C, Andreou, N, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Aresti, M, Arnaldi, R, Arneiro, JGMCA, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Baba, H, Badalà, A, Bae, J, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barile, F, Barioglio, L, Barlou, M, Barman, B, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Beltran, YAV, Bencedi, G, Beole, S, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Collective Flow, Hadron-Hadron Scattering, Jets, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Long- and short-range correlations for pairs of charged particles are studied via two-particle angular correlations in pp collisions at s = 13 TeV and p–Pb collisions at sNN = 5.02 TeV. The correlation functions are measured as a function of relative azimuthal angle ∆φ and pseudorapidity separation ∆η for pairs of primary charged particles within the pseudorapidity interval |η| < 0.9 and the transverse-momentum interval 1 < pT< 4 GeV/c. Flow coefficients are extracted for the long-range correlations (1.6 < |∆η| < 1.8) in various high-multiplicity event classes using the low-multiplicity template fit method. The method is used to subtract the enhanced yield of away-side jet fragments in high-multiplicity events. These results show decreasing flow signals toward lower multiplicity events. Furthermore, the flow coefficients for events with hard probes, such as jets or leading particles, do not exhibit any significant changes compared to those obtained from high-multiplicity events without any specific event selection criteria. The results are compared with hydrodynamic-model calculations, and it is found that a better understanding of the initial conditions is necessary to describe the results, particularly for low-multiplicity events.
Published: 2024

5. Photoproduction of low-p T J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: An excess of J/ψ yield at very low transverse momentum (pT
Published: 2023

6. First measurement of the Λ–Ξ interaction in proton–proton collisions at the LHC

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The first experimental information on the strong interaction between Λ and Ξ− strange baryons is presented in this Letter. The correlation function of Λ–Ξ− and Λ‾–Ξ‾+ pairs produced in high-multiplicity proton–proton (pp) collisions at s=13 TeV at the LHC is measured as a function of the relative momentum of the pair. The femtoscopy method is used to calculate the correlation function, which is then compared with theoretical expectations obtained using a meson exchange model, chiral effective field theory, and Lattice QCD calculations close to the physical point. Data support predictions of small scattering parameters while discarding versions with large ones, thus suggesting a weak Λ–Ξ− interaction. The limited statistical significance of the data does not yet allow one to constrain the effects of coupled channels like Σ–Ξ and N–Ω.
Published: 2023

7. Closing in on critical net-baryon fluctuations at LHC energies: Cumulants up to third order in Pb–Pb collisions

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Fluctuation measurements are important sources of information on the mechanism of particle production at LHC energies. This article reports the first experimental results on third-order cumulants of the net-proton distributions in Pb–Pb collisions at a center-of-mass energy sNN=5.02 TeV recorded by the ALICE detector. The results on the second-order cumulants of net-proton distributions at sNN=2.76 and 5.02 TeV are also discussed in view of effects due to the global and local baryon number conservation. The results demonstrate the presence of long-range rapidity correlations between protons and antiprotons. Such correlations originate from the early phase of the collision. The experimental results are compared with HIJING and EPOS model calculations, and the dependence of the fluctuation measurements on the phase-space coverage is examined in the context of lattice quantum chromodynamics (LQCD) and hadron resonance gas (HRG) model estimations. The measured third-order cumulants are consistent with zero within experimental uncertainties of about 4% and are described well by LQCD and HRG predictions.
Published: 2023

8. Study of charged particle production at high p T using event topology in pp, p–Pb and Pb–Pb collisions at s NN = 5.02 TeV

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: This letter reports measurements which characterize the underlying event associated with hard scatterings at mid-pseudorapidity (|η|
Published: 2023

9. Measurement of non-prompt D0-meson elliptic flow in Pb–Pb collisions at sNN=5.02 TeV

Author: Acharya, S, Adamová, D, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altamura, AR, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, N, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Aresti, M, Arnaldi, R, Arneiro, JGMCA, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Baba, H, Badalà, A, Bae, J, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barile, F, Barioglio, L, Barlou, M, Barman, B, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Beltran, YAV, Bencedi, G, Beole, S, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: The elliptic flow (v2) of D mesons from beauty-hadron decays (non-prompt D) was measured in midcentral (30–50%) Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02 TeV with the ALICE detector at the LHC. The D mesons were reconstructed at midrapidity (| y| < 0.8) from their hadronic decay D → K -π + , in the transverse momentum interval 2 < pT< 12 GeV/c. The result indicates a positive v2 for non-prompt D mesons with a significance of 2.7 σ . The non-prompt D -meson v2 is lower than that of prompt non-strange D mesons with 3.2 σ significance in 2
Published: 2023

10. Study of the p–p–K+ and p–p–K- dynamics using the femtoscopy technique

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arata, C, Arcelli, S, Aresti, M, Arnaldi, R, Arneiro, JGMCA, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Bae, J, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barile, F, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, Bielčíková, J, Biernat, J, Bigot, AP, and Bilandzic, A
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Nuclear and plasma physics, Particle and high energy physics, Synchrotrons and accelerators
Abstract: The interactions of kaons (K) and antikaons (K ¯) with few nucleons (N) were studied so far using kaonic atom data and measurements of kaon production and interaction yields in nuclei. Some details of the three-body KNN and K ¯ NN dynamics are still not well understood, mainly due to the overlap with multi-nucleon interactions in nuclei. An alternative method to probe the dynamics of three-body systems with kaons is to study the final state interaction within triplet of particles emitted in pp collisions at the Large Hadron Collider, which are free from effects due to the presence of bound nucleons. This Letter reports the first femtoscopic study of p–p–K + and p–p–K - correlations measured in high-multiplicity pp collisions at s = 13 TeV by the ALICE Collaboration. The analysis shows that the measured p–p–K + and p–p–K - correlation functions can be interpreted in terms of pairwise interactions in the triplets, indicating that the dynamics of such systems is dominated by the two-body interactions without significant contributions from three-body effects or bound states.
Published: 2023

11. Measurement of inclusive and leading subjet fragmentation in pp and Pb–Pb collisions at sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Barreto, L, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Behera, D, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, Bielčíková, J, and Biernat, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Jets and Jet Substructure, Quark-Gluon Plasma, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: This article presents new measurements of the fragmentation properties of jets in both proton–proton (pp) and heavy-ion collisions with the ALICE experiment at the Large Hadron Collider (LHC). We report distributions of the fraction zr of transverse momentum carried by subjets of radius r within jets of radius R. Charged-particle jets are reconstructed at midrapidity using the anti-k T algorithm with jet radius R = 0.4, and subjets are reconstructed by reclustering the jet constituents using the anti-k T algorithm with radii r = 0.1 and r = 0.2. In proton–proton collisions, we measure both the inclusive and leading subjet distributions. We compare these measurements to perturbative calculations at next-to-leading logarithmic accuracy, which suggest a large impact of threshold resummation and hadronization effects on the zr distribution. In heavy-ion collisions, we measure the leading subjet distributions, which allow access to a region of harder jet frag- mentation than has been probed by previous measurements of jet quenching via hadron fragmentation distributions. The zr distributions enable extraction of the parton-to-subjet fragmentation function and allow for tests of the universality of jet fragmentation functions in the quark–gluon plasma (QGP). We find no significant modification of zr distributions in Pb–Pb compared to pp collisions. However, the distributions are also consistent with a hardening trend for zr < 0.95, as predicted by several jet quenching models. As zr → 1 our results indicate that any such hardening effects cease, exposing qualitatively new possibilities to disentangle competing jet quenching mechanisms. By comparing our results to theoretical calculations based on an independent extraction of the parton-to-jet fragmentation function, we find consistency with the universality of jet fragmentation and no indication of factorization breaking in the QGP. [Figure not available: see fulltext.].
Published: 2023

12. Inclusive quarkonium production in pp collisions at s = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: This article reports on the inclusive production cross section of several quarkonium states, J / ψ, ψ(2 S) , Υ (1 S) , Υ (2 S) , and Υ (3 S) , measured with the ALICE detector at the LHC, in pp collisions at s=5.02 TeV. The analysis is performed in the dimuon decay channel at forward rapidity (2.5 < y< 4). The integrated cross sections and transverse-momentum (pT) and rapidity (y) differential cross sections for J / ψ, ψ(2 S) , Υ (1 S) , and the ψ(2 S) -to-J / ψ cross section ratios are presented. The integrated cross sections, assuming unpolarized quarkonia, are: σJ/ψ (pT< 20 GeV/c) = 5.88 ± 0.03 ± 0.34μb, σψ(2S) (pT< 12 GeV/c) = 0.87 ± 0.06 ± 0.10μb, σΥ(1S) (pT< 15 GeV/c) = 45.5 ± 3.9 ± 3.5 nb, σΥ (2 S) (pT< 15 GeV/c) = 22.4 ± 3.2 ± 2.7 nb, and σΥ (3 S) (pT< 15 GeV/c) = 4.9 ± 2.2 ± 1.0 nb, where the first (second) uncertainty is the statistical (systematic) one. For the first time, the cross sections of the three Υ states, as well as the ψ(2 S) one as a function of pTand y, are measured at s=5.02 TeV at forward rapidity. These measurements also significantly extend the J / ψpTreach and supersede previously published results. A comparison with ALICE measurements in pp collisions at s=2.76, 7, 8, and 13 TeV is presented and the energy dependence of quarkonium production cross sections is discussed. Finally, the results are compared with the predictions from several production models.
Published: 2023

13. A next-generation liquid xenon observatory for dark matter and neutrino physics

Author: Aalbers, J, AbdusSalam, SS, Abe, K, Aerne, V, Agostini, F, Maouloud, S Ahmed, Akerib, DS, Akimov, DY, Akshat, J, Al Musalhi, AK, Alder, F, Alsum, SK, Althueser, L, Amarasinghe, CS, Amaro, FD, Ames, A, Anderson, TJ, Andrieu, B, Angelides, N, Angelino, E, Angevaare, J, Antochi, VC, Martin, D Antón, Antunovic, B, Aprile, E, Araújo, HM, Armstrong, JE, Arneodo, F, Arthurs, M, Asadi, P, Baek, S, Bai, X, Bajpai, D, Baker, A, Balajthy, J, Balashov, S, Balzer, M, Bandyopadhyay, A, Bang, J, Barberio, E, Bargemann, JW, Baudis, L, Bauer, D, Baur, D, Baxter, A, Baxter, AL, Bazyk, M, Beattie, K, Behrens, J, Bell, NF, Bellagamba, L, Beltrame, P, Benabderrahmane, M, Bernard, EP, Bertone, GF, Bhattacharjee, P, Bhatti, A, Biekert, A, Biesiadzinski, TP, Binau, AR, Biondi, R, Biondi, Y, Birch, HJ, Bishara, F, Bismark, A, Blanco, C, Blockinger, GM, Bodnia, E, Boehm, C, Bolozdynya, AI, Bolton, PD, Bottaro, S, Bourgeois, C, Boxer, B, Brás, P, Breskin, A, Breur, PA, Brew, CAJ, Brod, J, Brookes, E, Brown, A, Brown, E, Bruenner, S, Bruno, G, Budnik, R, Bui, TK, Burdin, S, Buse, S, Busenitz, JK, Buttazzo, D, Buuck, M, Buzulutskov, A, Cabrita, R, Cai, C, Cai, D, Capelli, C, Cardoso, JMR, Carmona-Benitez, MC, Cascella, M, and Catena, R
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, dark matter, neutrinoless double-beta decay, neutrinos, supernova, direct detection, astroparticle physics, xenon, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for weakly interacting massive particles, while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector.
Published: 2023

14. Characterizing the initial conditions of heavy-ion collisions at the LHC with mean transverse momentum and anisotropic flow correlations

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, and Bianchi, L
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Correlations between mean transverse momentum [pT] and anisotropic flow coefficients v2 or v3 are measured as a function of centrality in Pb–Pb and Xe–Xe collisions at sNN=5.02 TeV and 5.44 TeV, respectively, with ALICE. In addition, the recently proposed higher-order correlation between [pT], v2, and v3 is measured for the first time, which shows an anticorrelation for the presented centrality ranges. These measurements are compared with hydrodynamic calculations using IP-Glasma and TRENTo initial-state shapes, the former based on the Color Glass Condensate effective theory with gluon saturation, and the latter a parameterized model with nucleons as the relevant degrees of freedom. The data are better described by the IP-Glasma rather than the TRENTo based calculations. In particular, Trajectum and JETSCAPE predictions, both based on the TRENTo initial state model but with different parameter settings, fail to describe the measurements. As the correlations between [pT] and vn are mainly driven by the correlations of the size and the shape of the system in the initial state, these new studies pave a novel way to characterize the initial state and help pin down the uncertainty of the extracted properties of the quark–gluon plasma recreated in relativistic heavy-ion collisions.
Published: 2022

15. Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizable coupling strength of the NΣ↔NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs, from zero relative momentum up to the opening of the NΣ channel. The correlation function in the relative momentum space for pΛ⊕p‾Λ‾ pairs measured in high-multiplicity triggered pp collisions at s=13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k⁎=289MeV/c. This represents the first direct experimental observation of the NΣ↔NΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣ↔NΛ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.
Published: 2022

16. General balance functions of identified charged hadron pairs of (π,K,p) in Pb–Pb collisions at s NN = 2.76 TeV

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: First measurements of balance functions (BFs) of all combinations of identified charged hadron (π,K,p) pairs in Pb–Pb collisions at sNN=2.76 TeV recorded by the ALICE detector are presented. The BF measurements are carried out as two-dimensional differential correlators versus the relative rapidity (Δy) and azimuthal angle (Δφ) of hadron pairs, and studied as a function of collision centrality. The Δφ dependence of BFs is expected to be sensitive to the light quark diffusivity in the quark–gluon plasma. While the BF azimuthal widths of all pairs substantially decrease from peripheral to central collisions, the longitudinal widths exhibit mixed behaviors: BFs of ππ and cross-species pairs narrow significantly in more central collisions, whereas those of KK and pp are found to be independent of collision centrality. This dichotomy is qualitatively consistent with the presence of strong radial flow effects and the existence of two stages of quark production in relativistic heavy-ion collisions. Finally, the first measurements of the collision centrality evolution of BF integrals are presented, with the observation that charge balancing fractions are nearly independent of collision centrality in Pb–Pb collisions. Overall, the results presented provide new and challenging constraints for theoretical models of hadron production and transport in relativistic heavy-ion collisions.
Published: 2022

17. Neutral to charged kaon yield fluctuations in Pb – Pb collisions at s NN = 2.76 TeV

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, and Bianchi, L
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: We present the first measurement of event-by-event fluctuations in the kaon sector in Pb – Pb collisions at sNN=2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator νdyn is used to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges. While the correlator νdyn[K+,K−] exhibits a scaling approximately in inverse proportion of the charged particle multiplicity, νdyn[KS0,K±] features a significant deviation from such scaling. Within uncertainties, the value of νdyn[KS0,K±] is independent of the selected transverse momentum interval, while it exhibits a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS–LHC predictions, and are further discussed in the context of the possible production of disoriented chiral condensates in central Pb – Pb collisions.
Published: 2022

18. Observation of a multiplicity dependence in the p T-differential charm baryon-to-meson ratios in proton–proton collisions at s = 13 TeV

Author: Collaboration, ALICE, Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The production of prompt D0, Ds+, and Λc+ hadrons, and their ratios, Ds+/D0 and Λc+/D0, are measured in proton–proton collisions at s=13 TeV at midrapidity (|y|
Published: 2022

19. Investigating the role of strangeness in baryon–antibaryon annihilation at the LHC

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Annihilation dynamics plays a fundamental role in the baryon–antibaryon interaction (B–B‾) at low-energy and its strength and range are crucial in the assessment of possible baryonic bound states. Experimental data on annihilation cross sections are available for the p–p‾ system but not in the low relative momentum region. Data regarding the B–B‾ interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon–antinucleon (N–N‾) results, when available. In this letter we present a measurement of the p–p‾, p–Λ‾⊕p‾–Λ and Λ–Λ‾ interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at s=13 TeV recorded by ALICE at the LHC. In the p–p‾ system the couplings to the mesonic channels in different partial waves are extracted by adopting a coupled-channel approach with recent χEFT potentials. The inclusion of these inelastic channels provides good agreement with the data, showing a significant presence of the annihilation term down to zero momentum. Predictions obtained using the Lednický–Lyuboshits formula and scattering parameters obtained from heavy-ion collisions, hence mainly sensitive to elastic processes, are compared with the experimental p–Λ‾⊕p‾–Λ and Λ–Λ‾ correlations. The model describes the Λ–Λ‾ data and underestimates the p–Λ‾⊕p‾–Λ data in the region of momenta below 200 MeV/c. The observed deviation indicates a different contribution of annihilation channels to the two systems containing strange hadrons.
Published: 2022

20. Measurement of K⁎(892)± production in inelastic pp collisions at the LHC

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The first results on K⁎(892)± resonance production in inelastic pp collisions at LHC energies of s=5.02, 8, and 13 TeV are presented. The K⁎(892)± has been reconstructed via its hadronic decay channel K⁎(892)→±KS0+π± with the ALICE detector. Measurements of transverse momentum distributions, pT-integrated yields, and mean transverse momenta for charged K⁎(892) are found to be consistent with previous ALICE measurements for neutral K⁎(892) within uncertainties. For pT>1 GeV/c the K⁎(892)± transverse momentum spectra become harder with increasing centre-of-mass energy from 5.02 to 13 TeV, similar to what previously observed for charged kaons and pions. For pT
Published: 2022

21. Laser-driven, ion-scale magnetospheres in laboratory plasmas. I. Experimental platform and first results

Author: Schaeffer, DB, Cruz, FD, Dorst, RS, Cruz, F, Heuer, PV, Constantin, CG, Pribyl, P, Niemann, C, Silva, LO, and Bhattacharjee, A
Subjects: Nuclear and Plasma Physics, Space Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Classical Physics, Fluids & Plasmas, Nuclear and plasma physics, Space sciences
Abstract: Magnetospheres are a ubiquitous feature of magnetized bodies embedded in a plasma flow. While large planetary magnetospheres have been studied for decades by spacecraft, ion-scale “mini” magnetospheres can provide a unique environment to study kinetic-scale, collisionless plasma physics in the laboratory to help validate models of larger systems. In this work, we present preliminary experiments of ion-scale magnetospheres performed on a unique high-repetition-rate platform developed for the Large Plasma Device at the University of California, Los Angeles. The experiments utilize a high-repetition-rate laser to drive a fast plasma flow into a pulsed dipole magnetic field embedded in a uniform magnetized background plasma. 2D maps of the magnetic field with high spatial and temporal resolution are measured with magnetic flux probes to examine the evolution of magnetosphere and current density structures for a range of dipole and upstream parameters. The results are further compared to 2D particle-in-cell simulations to identify key observational signatures of the kinetic-scale structures and dynamics of the laser-driven plasma. We find that distinct 2D kinetic-scale magnetopause and diamagnetic current structures are formed at higher dipole moments, and their locations are consistent with predictions based on pressure balances and energy conservation.
Published: 2022

22. Measurement of prompt D s + -meson production and azimuthal anisotropy in Pb–Pb collisions at s NN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The production yield and angular anisotropy of prompt Ds+ mesons were measured as a function of transverse momentum (pT) in Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV collected with the ALICE detector at the LHC. Ds+ mesons and their charge conjugates were reconstructed at midrapidity (|y|
Published: 2022

23. Production of Λ and K S 0 in jets in p–Pb collisions at s NN = 5.02 TeV and pp collisions at s = 7 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, Bielčíková, J, and Biernat, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The production of Λ baryons and KS0 mesons (V0 particles) was measured in p–Pb collisions at sNN=5.02 TeV and pp collisions at s=7 TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (pT) in high multiplicity pp and p–Pb collisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-kT algorithm using charged particles. The production of strange particles associated with jets pT,jetch>10 and pT,jetch>20 GeV/c in p–Pb collisions, and with jet pT,jetch>10 GeV/c in pp collisions is reported as a function of pT. Its dependence on angular distance from the jet axis, R(V0,jet), for jets with pT,jetch>10 GeV/c in p–Pb collisions is reported as well. The pT-differential production spectra of strange particles associated with jets are found to be harder compared to that in the underlying event and both differ from the inclusive measurements. In events containing a jet, the density of the V0 particles in the underlying event is found to be larger than the density in the minimum bias events. The Λ/KS0 ratio associated with jets in p–Pb collisions is consistent with the ratio in pp collisions and follows the expectation of jets fragmenting in vacuum. On the other hand, this ratio within jets is consistently lower than the one obtained in the underlying event and it does not show the characteristic enhancement of baryons at intermediate pT often referred to as “baryon anomaly” in the inclusive measurements.
Published: 2022

24. Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p–Pb collisions at s NN = 8.16 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Neutral pion (π0) and η meson production cross sections were measured up to unprecedentedly high transverse momenta (pT) in p–Pb collisions at sNN=8.16TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval −1.310 GeV/c, leaving essentially no room for final state energy loss. The new data provide strong constraints for nuclear parton distribution and fragmentation functions over a broad kinematic range and are compared to model predictions as well as previous results at sNN=5.02TeV.
Published: 2022

25. Production of light (anti)nuclei in pp collisions at s=5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: The study of the production of nuclei and antinuclei in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper, the production of protons, deuterons and 3He and their charge conjugates at midrapidity is studied as a function of the charged-particle multiplicity in inelastic pp collisions at s=5.02 TeV using the ALICE detector. Within the uncertainties, the yields of nuclei in pp collisions at s=5.02 TeV are compatible with those in pp collisions at different energies and to those in p–Pb collisions when compared at similar multiplicities. The measurements are compared with the expectations of coalescence and Statistical Hadronisation Models. The results suggest a common formation mechanism behind the production of light nuclei in hadronic interactions and confirm that they do not depend on the collision energy but on the number of produced particles.
Published: 2022

26. Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at s=13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Angular correlations of heavy-flavour and charged particles in high-energy proton–proton collisions are sensitive to the production mechanisms of heavy quarks and to their fragmentation as well as hadronisation processes. The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in proton–proton collisions at a centre-of-mass energy of s=13 TeV with the ALICE detector is reported, considering D , D +, and D ∗ + mesons in the transverse-momentum interval 3 < pT< 36 GeV/c at midrapidity (| y| < 0.5), and charged particles with pT> 0.3 GeV/c and pseudorapidity | η| < 0.8. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to previous ALICE measurements at lower energies. The study is also performed as a function of the charged-particle multiplicity, showing no modifications of the correlation function with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and away-side correlation peaks are studied and compared with predictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 provide the best description of the measured observables. The obtained results can provide guidance on tuning the generators.
Published: 2022

27. Prompt and non-prompt J/ψ production cross sections at midrapidity in proton-proton collisions at s = 5.02 and 13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, Bielčíková, J, and Biernat, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Hadron-Hadron Scattering, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The production of J/ψ is measured at midrapidity (|y| < 0.9) in proton-proton collisions at s = 5.02 and 13 TeV, through the dielectron decay channel, using the ALICE detector at the Large Hadron Collider. The data sets used for the analyses correspond to integrated luminosities of Lint = 19.4 ± 0.4 nb−1 and Lint = 32.2 ± 0.5 nb−1 at s = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/ψ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum pT = 2 GeV/c (1 GeV/c) at s = 5.02 TeV (13 TeV). The pT and rapidity (y) differential cross sections, as well as the corresponding values integrated over pT and y, are carried out separately for prompt and non-prompt J/ψ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the pT and y distributions of beauty quarks predicted by state-of-the-art perturbative QCD models are used to extrapolate an estimate of the b b ¯ pair cross section at midrapidity and in the total phase space. The total b b ¯ cross sections are found to be σbb ¯ = 541 ± 45 (stat.) ± 69 (syst.)−12+10 (extr.) μb and σbb ¯ = 218±37 (stat.)±31 (syst.)−9.1+8.2 (extr.) μb at s = 13 and 5.02 TeV, respectively. The value obtained from the combination of ALICE and LHCb measurements in pp collisions at s = 13 TeV is also provided. [Figure not available: see fulltext.]
Published: 2022

28. Use of Bayesian Optimization to understand the structure of nuclei

Author: Hooker, J, Kovoor, J, Jones, KL, Kanungo, R, Alcorta, M, Allen, J, Andreoiu, C, Atar, L, Bardayan, DW, Bhattacharjee, SS, Blankstein, D, Burbadge, C, Burcher, S, Catford, WN, Cha, S, Chae, K, Connolly, D, Davids, B, Esker, N, Garcia, FH, Gillespie, S, Ghimire, R, Gula, A, Hackman, G, Hallam, S, Hellmich, M, Henderson, J, Holl, M, Jassal, P, King, S, Knight, T, Kruecken, R, Lepailleur, A, Liang, J, Morrison, L, O’Malley, PD, Pain, SD, Pereira-Lopez, X, Psaltis, A, Radich, A, Shotter, AC, Vostinar, M, Williams, M, and Workman, O
Subjects: Affordable and Clean Energy, Bayesian optimization, Geant4 simulation, Low-energy reactions, Stable ion beam, Radioactive ion beam, Transfer reaction, Direct reaction, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Geochemistry, Interdisciplinary Engineering, Applied Physics
Abstract: Monte Carlo simulations are widely used in nuclear physics to model experimental systems. In cases where there are significant unknown quantities, such as energies of states, an iterative process of simulating and fitting is often required to describe experimental data. We describe a Bayesian approach to fitting experimental data, designed for data from a 12Be(d,p) reaction measurement, using simulations made with GEANT4. Q-values from the 12C(d,p) reaction to well-known states in 13C are compared with simulations using BayesOpt. The energies of the states were not included in the simulation to reproduce the situation for 13Be where the states are poorly known. Both cases had low statistics and significant resolution broadening owing to large proton energy losses in the solid deuterium target. Excitation energies of the lowest three excited states in 13C were extracted to better than 90 keV, paving a way for extracting information on 13Be.
Published: 2022

29. Measurement of beauty production via non-prompt D0 mesons in Pb-Pb collisions at sNN= 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy Ion Experiments, Heavy Quark Production, Quark Gluon Plasma, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The production of non-prompt D0 mesons from beauty-hadron decays was measured at midrapidity (|y| < 0.5) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of sNN = 5.02 TeV with the ALICE experiment at the LHC. Their nuclear modification factor (RAA), measured for the first time down to pT = 1 GeV/c in the 0–10% and 30–50% centrality classes, indicates a significant suppression, up to a factor of about three, for pT> 5 GeV/c in the 0–10% central Pb-Pb collisions. The data are described by models that include both collisional and radiative processes in the calculation of beauty-quark energy loss in the quark-gluon plasma, and quark recombination in addition to fragmentation as a hadronisation mechanism. The ratio of the non-prompt to prompt D0-meson RAA is larger than unity for pT> 4 GeV/c in the 0–10% central Pb-Pb collisions, as predicted by models in which beauty quarks lose less energy than charm quarks in the quark-gluon plasma because of their larger mass. [Figure not available: see fulltext.]
Published: 2022

30. Production of light (anti)nuclei in pp collisions at s = 13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Hadron-Hadron scattering, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Understanding the production mechanism of light (anti)nuclei is one of the key challenges of nuclear physics and has important consequences for astrophysics, since it provides an input for indirect dark-matter searches in space. In this paper, the latest results about the production of light (anti)nuclei in pp collisions at s = 13 TeV are presented, focusing on the comparison with the predictions of coalescence and thermal models. For the first time, the coalescence parameters B2 for deuterons and B3 for helions are compared with parameter-free theoretical predictions that are directly constrained by the femtoscopic measurement of the source radius in the same event class. A fair description of the data with a Gaussian wave function is observed for both deuteron and helion, supporting the coalescence mechanism for the production of light (anti)nuclei in pp collisions. This method paves the way for future investigations of the internal structure of more complex nuclear clusters, including the hypertriton. [Figure not available: see fulltext.].
Published: 2022

31. Study of very forward energy and its correlation with particle production at midrapidity in pp and p-Pb collisions at the LHC

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy Ion Experiments, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The energy deposited at very forward rapidities (very forward energy) is a powerful tool for characterising proton fragmentation in pp and p-Pb collisions. The correlation of very forward energy with particle production at midrapidity provides direct insights into the initial stages and the subsequent evolution of the collision. Furthermore, the correlation with the production of particles with large transverse momenta at midrapidity provides information complementary to the measurements of the underlying event, which are usually interpreted in the framework of models implementing centrality-dependent multiple parton interactions. Results about very forward energy, measured by the ALICE zero degree calorimeters (ZDCs), and its dependence on the activity measured at midrapidity in pp collisions at s = 13 TeV and in p-Pb collisions at sNN = 8.16 TeV are discussed. The measurements performed in pp collisions are compared with the expectations of three hadronic interaction event generators: PYTHIA 6 (Perugia 2011 tune), PYTHIA 8 (Monash tune), and EPOS LHC. These results provide new constraints on the validity of models in describing the beam remnants at very forward rapidities, where perturbative QCD cannot be used. [Figure not available: see fulltext.]
Published: 2022

32. Multiplicity dependence of charged-particle jet production in pp collisions at s=13TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of s=13TeV is studied for the first time. Jets are reconstructed from charged particles using the anti-kT algorithm with resolution parameters R varying from 0.2 to 0.7. The jets are measured in the pseudorapidity range | ηjet| < 0.9 - R and in the transverse momentum range 5
Published: 2022

33. Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at s = 5.02 and 13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alocco, G, Alt, T, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Banerjee, D, Banoo, Z, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Battistini, D, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Becht, P, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Hadron-Hadron Scattering, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The production of J/ψ is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies s = 5.02 and 13 TeV. The J/ψ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dNch/dη) is measured at midrapidity (|η| < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dNch/dη/〈dNch/dη〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (〈pT〉) of J/ψ in pp collisions exhibits an increasing trend as a function of dNch/dη/〈dNch/dη〉 showing a saturation towards high charged-particle multiplicities. [Figure not available: see fulltext.]
Published: 2022

34. Inclusive, prompt and non-prompt J/ψ production at midrapidity in p-Pb collisions at sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Mathematical Physics, Mathematical Sciences, Physical Sciences, Heavy Ion Experiments, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: A measurement of inclusive, prompt, and non-prompt J/ψ production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy sNN = 5.02 TeV is presented. The inclusive J/ψ mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum pT = 0. The inclusive J/ψ nuclear modification factor RpPb is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/ψ mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/ψ on a statistical basis for pT larger than 1.0 GeV/c. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p-Pb run, corresponding to an integrated luminosity Lint = 292 ± 11 μb−1, which is six times larger than the previous publications. The total uncertainty on the pT-integrated inclusive J/ψ and non-prompt J/ψ cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and RpPb are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/ψ production cross section, the b b ¯ production cross section at midrapidity, d σbb ¯/dy, and the total cross section extrapolated over full phase space, σbb ¯, are derived. [Figure not available: see fulltext.]
Published: 2022

35. Measurements of the groomed and ungroomed jet angularities in pp collisions at s = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Heavy Ion Experiments, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The jet angularities are a class of jet substructure observables which characterize the angular and momentum distribution of particles within jets. These observables are sensitive to momentum scales ranging from perturbative hard scatterings to nonperturbative fragmentation into final-state hadrons. We report measurements of several groomed and ungroomed jet angularities in pp collisions at s = 5.02 TeV with the ALICE detector. Jets are reconstructed using charged particle tracks at midrapidity (|η| < 0.9). The anti-kT algorithm is used with jet resolution parameters R = 0.2 and R = 0.4 for several transverse momentum pTchjet intervals in the 20–100 GeV/c range. Using the jet grooming algorithm Soft Drop, the sensitivity to softer, wide-angle processes, as well as the underlying event, can be reduced in a way which is well-controlled in theoretical calculations. We report the ungroomed jet angularities, λα, and groomed jet angularities, λα,g, to investigate the interplay between perturbative and nonperturbative effects at low jet momenta. Various angular exponent parameters α = 1, 1.5, 2, and 3 are used to systematically vary the sensitivity of the observable to collinear and soft radiation. Results are compared to analytical predictions at next-to-leading-logarithmic accuracy, which provide a generally good description of the data in the perturbative regime but exhibit discrepancies in the nonperturbative regime. Moreover, these measurements serve as a baseline for future ones in heavy-ion collisions by providing new insight into the interplay between perturbative and nonperturbative effects in the angular and momentum substructure of jets. They supply crucial guidance on the selection of jet resolution parameter, jet transverse momentum, and angular scaling variable for jet quenching studies. [Figure not available: see fulltext.]
Published: 2022

36. Inclusive J/ψ production at midrapidity in pp collisions at s=13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Affordable and Clean Energy, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: We report on the inclusive J / ψ production cross section measured at the CERN Large Hadron Collider in proton–proton collisions at a center-of-mass energy s=13 TeV. The J / ψ mesons are reconstructed in the e +e - decay channel and the measurements are performed at midrapidity (| y| < 0.9) in the transverse-momentum interval 0 < pT< 40 GeV/c, using a minimum-bias data sample corresponding to an integrated luminosity Lint=32.2nb-1 and an Electromagnetic Calorimeter triggered data sample with Lint=8.3pb-1. The pT-integrated J / ψ production cross section at midrapidity, computed using the minimum-bias data sample, is dσ/dy|y=0=8.97±0.24(stat)±0.48(syst)±0.15(lumi)μb. An approximate logarithmic dependence with the collision energy is suggested by these results and available world data, in agreement with model predictions. The integrated and pT-differential measurements are compared with measurements in pp collisions at lower energies and with several recent phenomenological calculations based on the non-relativistic QCD and Color Evaporation models.
Published: 2021

37. ϒ production and nuclear modification at forward rapidity in Pb–Pb collisions at s NN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The production of ϒ mesons in Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region 2.5
Published: 2021

38. Charged-particle multiplicity fluctuations in Pb–Pb collisions at sNN = 2.76 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at sNN = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range | η| < 0.8 and transverse momentum 0.2 < pT< 2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η and pT dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions.
Published: 2021

39. Searching for solar KDAR with DUNE

Author: collaboration, The DUNE, Abud, A Abed, Abi, B, Acciarri, R, Acero, MA, Adames, MR, Adamov, G, Adams, D, Adinolfi, M, Aduszkiewicz, A, Aguilar, J, Ahmad, Z, Ahmed, J, Ali-Mohammadzadeh, B, Alion, T, Allison, K, Monsalve, S Alonso, Alrashed, M, Alt, C, Alton, A, Amedo, P, Anderson, J, Andreopoulos, C, Andreotti, M, Andrews, MP, Andrianala, F, Andringa, S, Anfimov, N, Ankowski, A, Antoniassi, M, Antonova, M, Antoshkin, A, Antusch, S, Aranda-Fernandez, A, Ariga, A, Arnold, LO, Arroyave, MA, Asaadi, J, Asquith, L, Aurisano, A, Aushev, V, Autiero, D, Ayala-Torres, M, Azfar, F, Back, A, Back, H, Back, JJ, Backhouse, C, Baesso, P, Bagaturia, I, Bagby, L, Balashov, N, Balasubramanian, S, Baldi, P, Baller, B, Bambah, B, Barao, F, Barenboim, G, Barker, GJ, Barkhouse, W, Barnes, C, Barr, G, Monarca, J Barranco, Barros, A, Barros, N, Barrow, JL, Basharina-Freshville, A, Bashyal, A, Basque, V, Belchior, E, Battat, JBR, Battisti, F, Bay, F, Alba, JL Bazo, Beacom, JF, Bechetoille, E, Behera, B, Bellantoni, L, Bellettini, G, Bellini, V, Beltramello, O, Belver, D, Benekos, N, Montiel, C Benitez, Neves, F Bento, Berger, J, Berkman, S, Bernardini, P, Berner, RM, Berns, H, Bertolucci, S, Betancourt, M, Rodríguez, A Betancur, Bevan, A, Bezerra, TJC, Bhatnagar, V, Bhattacharjee, M, Bhuller, S, Bhuyan, B, and Biagi, S
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Affordable and Clean Energy, dark matter theory, neutrino detectors, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract: The observation of 236 MeV muon neutrinos from kaon-decay-at-rest (KDAR) originating in the core of the Sun would provide a unique signature of dark matter annihilation. Since excellent angle and energy reconstruction are necessary to detect this monoenergetic, directional neutrino flux, DUNE with its vast volume and reconstruction capabilities, is a promising candidate for a KDAR neutrino search. In this work, we evaluate the proposed KDAR neutrino search strategies by realistically modeling both neutrino-nucleus interactions and the response of DUNE. We find that, although reconstruction of the neutrino energy and direction is difficult with current techniques in the relevant energy range, the superb energy resolution, angular resolution, and particle identification offered by DUNE can still permit great signal/background discrimination. Moreover, there are non-standard scenarios in which searches at DUNE for KDAR in the Sun can probe dark matter interactions.
Published: 2021

40. First measurements of N-subjettiness in central Pb-Pb collisions at sNN = 2.76 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy Ion Experiments, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb-Pb collisions at centre-of-mass energies of s = 7 TeV and sNN = 2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R = 0.4 and charged jet transverse momentum of 40 ≤ pT,jet ≤ 60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in Pb-Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ∆R, are also performed in pp collisions at s = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at s = 7 TeV, in order to validate the model as a vacuum reference for the Pb-Pb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb-Pb collisions compared to pp collisions. [Figure not available: see fulltext.]
Published: 2021

41. Anisotropic flow of identified hadrons in Xe-Xe collisions at sNN = 5.44 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Heavy Ion Experiments, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Measurements of elliptic (v2) and triangular (v3) flow coefficients of π±, K±, p+p ¯ , KS0, and Λ+Λ ¯ obtained with the scalar product method in Xe-Xe collisions at sNN = 5.44 TeV are presented. The results are obtained in the rapidity range |y| < 0.5 and reported as a function of transverse momentum, pT, for several collision centrality classes. The flow coefficients exhibit a particle mass dependence for pT< 3 GeV/c, while a grouping according to particle type (i.e., meson and baryon) is found at intermediate transverse momenta (3 < pT< 8 GeV/c). The magnitude of the baryon v2 is larger than that of mesons up to pT = 6 GeV/c. The centrality dependence of the shape evolution of the pT-differential v2 is studied for the various hadron species. The v2 coefficients of π±, K±, and p+p ¯ are reproduced by MUSIC hydrodynamic calculations coupled to a hadronic cascade model (UrQMD) for pT< 1 GeV/c. A comparison with vn measurements in the corresponding centrality intervals in Pb-Pb collisions at sNN = 5.02 TeV yields an enhanced v2 in central collisions and diminished value in semicentral collisions. [Figure not available: see fulltext.]
Published: 2021

42. Measurement of the production cross section of prompt Ξc0 baryons at midrapidity in pp collisions at s = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, and Bianchi, N
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Heavy Ion Experiments, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: The transverse momentum (pT) differential cross section of the charm-strange baryon Ξc0 is measured at midrapidity (|y| < 0.5) via its semileptonic decay into e+Ξ−νe in pp collisions at s = 5.02 TeV with the ALICE detector at the LHC. The ratio of the pT-differential Ξc0-baryon and D0-meson production cross sections is also reported. The measurements are compared with simulations with different tunes of the PYTHIA 8 event generator, with predictions from a statistical hadronisation model (SHM) with a largely augmented set of charm-baryon states beyond the current lists of the Particle Data Group, and with models including hadronisation via quark coalescence. The pT-integrated cross section of prompt Ξc0-baryon production at midrapidity is also reported, which is used to calculate the baryon-to-meson ratio Ξc0/D0 = 0.20 ± 0.04 (stat.)−0.07+0.08 (syst.). These results provide an additional indication of a modification of the charm fragmentation from e+e− and e−p collisions to pp collisions. [Figure not available: see fulltext.]
Published: 2021

43. KS0- and (anti-)Λ-hadron correlations in pp collisions at s=13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akbar, Z, Akindinov, A, Al-Turany, M, Alam, SN, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antinori, F, Antonioli, P, Anuj, C, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bailung, Y, Bala, R, Balbino, A, Baldisseri, A, Balis, B, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Two-particle Azimuthal correlations are measured with the ALICE apparatus in pp collisions at s=13 TeV to explore strangeness- and multiplicity-related effects in the fragmentation of jets and the transition regime between bulk and hard production, probed with the condition that a strange meson (KS0) or baryon (Λ) with transverse momentum pT> 3 GeV/c is produced. Azimuthal correlations between kaons or Λ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger (3
Published: 2021

44. Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at s, sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Sciences, Physical Sciences, Heavy Ion Experiments, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and Pythia 8 based models describe the data well for the higher jT region, while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”), related to the perturbative component of the fragmentation process, and with a Gaussian for lower jT values (called the “narrow component”), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation. [Figure not available: see fulltext.]
Published: 2021

45. Production of muons from heavy-flavour hadron decays at high transverse momentum in Pb–Pb collisions at s NN = 5.02 and 2.76 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Berzano, D, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Measurements of the production of muons from heavy-flavour hadron decays in Pb–Pb collisions at sNN=5.02 and 2.76 TeV using the ALICE detector at the LHC are reported. The nuclear modification factor RAA at sNN=5.02 TeV is measured at forward rapidity (2.57 GeV/c). The RAA shows an increase of the suppression of the yields of muons from heavy-flavour hadron decays with increasing centrality. A suppression by a factor of about three is observed in the 10% most central collisions. The RAA at sNN=5.02 TeV is similar to that at sNN=2.76 TeV. The precise RAA measurements have the potential to distinguish between model predictions implementing different mechanisms of parton energy loss in the high-density medium formed in heavy-ion collisions. They place important constraints for the understanding of the heavy-quark interaction with the hot and dense QCD medium.
Published: 2021

46. Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s , √sNN = 5.02 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, Bielčík, J, and Bielčíková, J
Subjects: Heavy Ion Experiments, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and Pythia 8 based models describe the data well for the higher jT region, while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”), related to the perturbative component of the fragmentation process, and with a Gaussian for lower jT values (called the “narrow component”), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation. [Figure not available: see fulltext.]
Published: 2021

47. Jet-associated deuteron production in pp collisions at s=13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: Deuteron production in high-energy collisions is sensitive to the space–time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated deuteron production in pp collisions at s=13 TeV, providing an opportunity to test the established picture for deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum (pT>5 GeV/c) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of deuterons being produced around the jet proxy. The associated deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4–4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
Published: 2021

48. Inclusive heavy-flavour production at central and forward rapidity in Xe–Xe collisions at sNN=5.44 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Alfaro Molina, R, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Bazo Alba, JL, Bearden, IG, Beattie, C, Belikov, I, Bell Hechavarria, ADC, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The first measurements of the production of muons and electrons from heavy-flavour hadron decays in Xe–Xe collisions at sNN=5.44 TeV, using the ALICE detector at the LHC, are reported. The measurement of the nuclear modification factor RAA is performed as a function of transverse momentum pT in several centrality classes at forward rapidity (2.5
Published: 2021

49. Inclusive heavy-flavour production at central and forward rapidity in Xe–Xe collisions at s NN = 5.44 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The first measurements of the production of muons and electrons from heavy-flavour hadron decays in Xe–Xe collisions at sNN=5.44 TeV, using the ALICE detector at the LHC, are reported. The measurement of the nuclear modification factor RAA is performed as a function of transverse momentum pT in several centrality classes at forward rapidity (2.5
Published: 2021

50. Jet-associated deuteron production in pp collisions at s = 13 TeV

Author: Acharya, S, Adamová, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Akbar, Z, Akindinov, A, Al-Turany, M, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfanda, HM, Molina, R Alfaro, Ali, B, Ali, Y, Alici, A, Alizadehvandchali, N, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andronic, A, Angeletti, M, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Apadula, N, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arratia, M, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Aziz, S, Azmi, MD, Badalà, A, Baek, YW, Bai, X, Bailhache, R, Bala, R, Balbino, A, Baldisseri, A, Ball, M, Banerjee, D, Barbera, R, Barioglio, L, Barlou, M, Barnaföldi, GG, Barnby, LS, Barret, V, Bartels, C, Barth, K, Bartsch, E, Baruffaldi, F, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Bauri, D, Alba, JL Bazo, Bearden, IG, Beattie, C, Belikov, I, Hechavarria, ADC Bell, Bellini, F, Bellwied, R, Belokurova, S, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berdnikova, A, Berenyi, D, Bergmann, L, Besoiu, MG, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhat, MA, Bhattacharjee, B, Bhattacharya, P, Bianchi, A, Bianchi, L, Bianchi, N, and Bielčík, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Deuteron production in high-energy collisions is sensitive to the space–time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated deuteron production in pp collisions at s=13 TeV, providing an opportunity to test the established picture for deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum (pT>5 GeV/c) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of deuterons being produced around the jet proxy. The associated deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4–4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
Published: 2021

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