Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC

Acharya, S.; Adamová, D.; Adler, A.; Adolfsson, J.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agrawal, Neelima; Ahammed, Z.; Ahmad, S.; Ahn, Sang Un; Akindinov, A.; Al-Turany, M.; Alam, Sk Noor; Albuquerque, D. S. D.; Aleksandrov, Dmitry; Alessandro, B.; Alfanda, Haidar Mas'Ud; Molina, R. Alfaro; Ali, B.; Ali, Y.; Alici, A.; Alkin, A.; Alme, J.; Alt, T.; Altenkamper, L.; Altsybeev, I.; Anaam, Mustafa; Andrei, C.; Andreou, D.; Andrews, H. A.; Andronic, A.; Angeletti, M.; Anguelov, V.; Anson, C.; Antičić, T.; Antinori, F.; Antonioli, P.; Anwar, R.; Apadula, N.; Aphecetche, L.; Appelshäuser, H.; Arcelli, S.; Arnaldi, R.; Arratia, M.; Arsene, Ionut Cristian; Arslandok, M.; Augustinus, A.; Averbeck, R.; Aziz, S.; Azmi, M. D.; Badalà, A.; Baek, Y. W.; Bagnasco, S.; Bai, Xiaozhi; Bailhache, R.; Bala, R.; Baldisseri, A.; Ball, M.; Balouza, S.; Barbera, R.; Barioglio, L.; Barnaföldi, G. G.; Barnby, L.S.; Barret, V.; Bartalini, P.; Barth, K.; Bartsch, E.; Baruffaldi, F.; Bastid, N.; Basu, S.; Batigne, G.; Batyunya, B.; Bauri, D.; Alba, J. L. Bazo; Bearden, Ian Gardner; Bedda, C.; Behera, N. K.; Belikov, I.; Hechavarria, A. D. C. Bell; Bellini, F.; Bellwied, R.; Belyaev, V.; Bencédi, G.; Beolè, S.; Bercuci, A.; Berdnikov, Y.; Berényi, D.; Bertens, R. A.; Berzano, D.; Besoiu, Mihaela Gabriela; Betev, L.; Bhasin, A.; Bhat, I. R.; Bhat, Mohammad Asif; Bhatt, H.; Bhattacharjee, B.; Bianchi, A.; Bianchi, L.; Bianchi, N.; Bielčík, J.; Bielčíková, J.; Bilandzic, A.; Bíró, G.; Biswas, R.; Biswas, S.; Blair, Justin Thomas; Blau, D.; Blume, C.; Boca, G.; Bock, F.; Bøgdanov, A.; Boi, S.; Boldizsár, L.; Bolozdynya, A.; Bombara, M.; Bonomi, G.; Borel, H.; Borissov, A.; Bossi, Hannah; Botta, E.; Bratrud, L.; Braun‐Munzinger, P.; Bregant, M.; Broz, M.; Brücken, E.; Bruna, E.; Bruno, G. E.; Buckland, Matthew Daniel; Budnikov, D.; Buesching, H.; Bufalino, S.; Bugnon, Ophelie; Bühler, P.; Bunčić, P.; Buthelezi, Z.; Butt, J.; Buxton, J. T.; Bysiak, Sebastian Adam; Caffarri, D.; Caliva, A.; Villar, E. Calvo; Camacho, Rabi Soto; Camerini, P.; Capon, A. A.; Carnesecchi, F.; Caron, Robin Albert Andre; Castellanos, J. Castillo; Castro, A.; Casula, Ester Anna Rita; Catalano, F.; Sànchez, C. Ceballos; Chakraborty, Purnendu; Chandra, S.; Chang, W.; Chapeland, S.; Chartier, M.; Chattopadhyay, S.; Chauvin, A.; Cheshkov, C.; Cheynis, B.; Barroso, V. Chibante; Chinellato, D. D.; Cho, S.; Chochula, P.; Chowdhury, T.; Christakoglou, P.; Christensen, C. H.; Christiansen, P.; Chujo, T.; Cicalò, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Colamaria, F.; Colella, D.; Collu, A.; Colocci, M.; Concas, M.; Balbastre, G. Conesa; Valle, Z. Conesa del; Contin, G.; Contreras, J. G.; Cormier, T. M.; Morales, Y. Corrales; Cortese, P.; Cosentino, M. R.; Costa, F.; Costanza, S.; Crochet, P.; Cuautle, E.; Cui, Pengyao; Cunqueiro, L.; Dąbrowski, D.; Dahms, T.; Dainese, A.; Damas, F. P. A.; Danisch, Meike Charlotte; Danu, A.; Das, D.; Das, I.; Das, P.; Das, S.; Dash, A.; Dash, S.; De, S.; De, A.; Cataldo, G. de; Cuveland, J. de; Falco, A. De; Gruttola, D. De; Marco, N. De; Pasquale, S. De; Deb, Suman; Debjani, B.; Degenhardt, Hermann Franz; Deja, Kamil Rafał; Deloff, A.; Delsanto, S.; Devetak, D.; Dhankher, P.; Bari, D. Di; Mauro, A. Di; Díaz, Raúl Arteche; Dietel, T.; Dillenseger, P.; Ding, Y.; Divià, R.; Dixit, Dhruv Utpalkumar; Djuvsland, Ø.; Dmitrieva, Uliana; Dobrin, A.; Dönigus, B.; Dordic, O.; Dubey, A. K.; Dubla, A.; Dudi, S.; Mallick, Dukhishyam; Dupieux, P.; Ehlers, R. J.; Eikeland, Viljar Nilsen; Elia, D.; Engel, H.; Epple, E.; Erazmus, B.; Erhardt, F.; Erokhin, A.; Ersdal, Magnus Rentsch; Espagnon, B.; Esumi, S.; Eulisse, G.; Evans, D.; Evdokimov, S.; Fabbietti, L.; Faggin, M.; Faivre, J.; Fan, F.; Fantoni, A.; Fasel, M.; Fecchio, P.; Feliciello, A.; Феофилов, Г.; Téllez, A. Fernández; Ferrero, A.; Ferretti, A.; Festanti, A.; Feuillard, Victor Jose Gaston; Figiel, J.; Filchagin, S.; Finogeev, D.; Fionda, F. M.; Fiorenza, G.; Flor, F.; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Frankenfeld, U.; Fuchs, U.; Furget, C.; Furs, A.; Girard, M. Fusco; Gaardhøje, J. J.; Gagliardi, M.; Gago, A. M.; Gal, A.; Galvan, C. D.; Ganoti, P.; Garabatos, C.; García-Solis, E.; Garg, K.; Gargiulo, C.; Garibli, Aydan; Garner, K.; Gasik, P.; Gauger, Erin Frances; Ducati, M. B. Gay; Germain, M.; Ghosh, J.; Ghosh, P.; Ghosh, S. K.; Gianotti, P.; Giubellino, P.; Giubilato, P.; Glässel, P.; Coral, D. M. Goméz; Ramírez, A. 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doi:10.1103/physrevlett.125.022301

Cited by 81 publications

(45 citation statements)

References 70 publications

Supporting

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“…The charged-particle directed flow in Pb-Pb collisions at √ s NN = 2.76 TeV is about three times smaller [20] than at the top RHIC energy of 200 GeV. This suggest that the global polarization at the Large Haron Collider (LHC) energies should be also about three times smaller than at RHIC (around ∼0.08%) and decreasing from √ s NN = 2.76 to 5.02 TeV by about ∼30% [21]. Even smaller polarization values at the LHC are expected when the directed flow is seen as a combination of the two effects: the tilt of the source in the longitudinal direction and the dipole flow originating from the asymmetry in the initial energy density distributions [22].…”

Section: Introductionmentioning

confidence: 94%

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
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The global polarization of the and hyperons is measured for Pb-Pb collisions at √ s NN = 2.76 and 5.02 TeV recorded with the ALICE at the Large Hadron Collider (LHC). The results are reported differentially as a function of collision centrality and hyperon's transverse momentum (p T) for the range of centrality 5-50%, 0.5 < p T < 5 GeV/c, and rapidity |y| < 0.5. The hyperon global polarization averaged for Pb-Pb collisions at √ s NN = 2.76 and 5.02 TeV is found to be consistent with zero, P H (%) ≈ 0.01 ± 0.06 (stat.) ± 0.03 (syst.) in the collision centrality range 15-50%, where the largest signal is expected. The results are compatible with expectations based on an extrapolation from measurements at lower collision energies at the Relativistic Heavy Ion Collider, hydrodynamical model calculations, and empirical estimates based on collision energy dependence of directed flow, all of which predict the global polarization values at LHC energies of the order of 0.01%.

show abstract

Section: Introductionmentioning

confidence: 94%

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
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show abstract

“…The directed flow for prompt D 0 and D 0 mesons, and their difference, is shown in Fig. 4 slope as a function of pseudorapidity η, which is larger than zero with a significance of 2.7σ and about three orders of magnitude larger than the measured slope for charged hadrons [16]. These…”

Section: Pos(ichep2020)571mentioning

confidence: 76%

“…Transport models including both fragmentation and recombination fairly describe the v 2 and v 3 of D mesons, suggesting a range for the charm thermalisation time between 3 and 14 fm/c [12]. The first harmonic coefficient (v 1 ), called directed flow, is measured for prompt D 0 and D 0 mesons by the ALICE Collaboration as well [16]. The directed flow of charmed hadrons is suggested as a powerful probe to study the strong electromagnetic fields produced in heavy-ion collisions due to the early production time of charm quarks and the charm thermalisation time, which is similar to the QGP lifetime.…”

Section: Pos(ichep2020)571mentioning

confidence: 99%

Open heavy-flavour production from small to large collision systems with ALICE at the LHC

Vermunt¹

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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Heavy quarks are effective probes to study the properties of the quark-gluon plasma (QGP) produced in ultra-relativistic heavy-ion collisions. In this contribution, the latest results on open heavy-flavour production in pp and Pb-Pb collisions measured by the ALICE Collaboration will be discussed. Measurements of open heavy-flavour production in Pb-Pb collisions allow for testing the mechanisms of heavy-quark transport and energy loss in the medium. In addition, measurements of the elliptic (v 2) and triangular (v 3) flow coefficients of heavy-flavour particles give insights into the participation of heavy quarks in the collective motion of the medium, the path-length dependence of their in-medium energy loss, and recombination effects during the hadronisation. Finally, the directed flow (v 1) of open heavy-flavour particles is sensitive to the unprecedentedly strong magnetic fields present in the early stages of the collision, and so measurements of its charge dependence are key to constraining the electrical conductivity of the QGP. In small hadronic systems like pp, open heavy-flavour production provides the baseline for the investigation of hot-medium effects in heavy-ion collisions, as well as tests of perturbative quantum chromodynamic calculations.

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“…In the center of the created QGP, the ""⃗ field reaches an extreme magnitude, on the order of 10 )% Tesla or more, which is the strongest magnetic field known in today's Universe. New effects arising from such extreme magnetic field have been explored both experimentally and theoretically [43][44][45][46][47][48]. Panel a is adapted with permission from Ref.…”

Section: Fig3 Extremely Strong Magnetic Field In a Heavy-ion Collisimentioning

confidence: 99%

Chiral magnetic effect reveals the topology of gauge fields in heavy-ion collisions

Kharzeev

Liao

2020

Nat Rev Phys

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The topological structure of vacuum is the cornerstone of non-Abelian gauge theories describing strong and electroweak interactions within the standard model of particle physics. However, transitions between different topological sectors of the vacuum (believed to be at the origin of the baryon asymmetry of the Universe) have never been observed directly. An experimental observation of such transitions in Quantum Chromodynamics (QCD) has become possible in heavy-ion collisions, where the chiral magnetic effect converts the chiral asymmetry (generated by topological transitions in hot QCD matter) into an electric current, under the presence of the magnetic field produced by the colliding ions. The Relativistic Heavy Ion Collider program on heavy-ion collisions such as the Zr-Zr and Ru-Ru isobars, thus has the potential to uncover the topological structure of vacuum in a laboratory experiment. This discovery would have farreaching implications for the understanding of QCD, the origin of the baryon asymmetry in the present-day Universe, and for other areas, including condensed matter physics.

show abstract

Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC

Cited by 81 publications

References 70 publications

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
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Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
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Open heavy-flavour production from small to large collision systems with ALICE at the LHC

Chiral magnetic effect reveals the topology of gauge fields in heavy-ion collisions

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Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC

Cited by 81 publications

References 70 publications

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNNAcharya1, Antičić2, Erhardt3 et al. 2020Phys. Rev. CSelf Cite891350View full textAdd to dashboardCite

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNNAcharya1, Antičić2, Erhardt3 et al. 2020Phys. Rev. CSelf Cite891350View full textAdd to dashboardCite

Open heavy-flavour production from small to large collision systems with ALICE at the LHC

Chiral magnetic effect reveals the topology of gauge fields in heavy-ion collisions

Contact Info

Product

Resources

About

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
View full text Add to dashboard Cite

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN
Acharya
¹
,
Antičić
²
,
Erhardt
³

et al. 2020
Phys. Rev. C
Self Cite
89
1
35
0
View full text Add to dashboard Cite