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1,471 results on '"Pedrosa F."'

1. Beam from Injectors: The LHC Injectors Upgrade (LIU) Project

Author

Meddahi, M., primary, Rumolo, G., additional, Alemany, R., additional, Bartosik, H., additional, Bellodi, G., additional, Coupard, J., additional, Damerau, H., additional, Di Giovanni, G. P., additional, Funken, A., additional, Garoby, R., additional, Gilardoni, S., additional, Goddard, B., additional, Hanke, K., additional, Huschauer, A., additional, Kain, V., additional, Lombardi, A., additional, Manglunki, D., additional, Mikulec, B., additional, Pedrosa, F., additional, Prodon, S., additional, Scrivens, R., additional, and Shaposhnikova, E., additional

Published
2024
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7. Towards magnetic control of magnetite

Author

Pedrosa, F. J., Cuñado, J. L. F., Perna, P., Sanz, M., Oujja, M., Rebollar, E., Marco, J. F., de la Figuera, J., Monti, M., Castillejo, M., Garcia-Hernández, M., Mompeán, F., Camarero, J., and Bollero, A.

Subjects
Condensed Matter - Materials Science
Abstract

High quality stoichiometric magnetite (Fe3O4) films grown by infrared pulsed laser deposition (IR-PLD) on different surfaces were investigated in order to study the influence of the substrate, orientation, and thickness on their magnetic behavior. Different single crystal (001)-oriented substrates, i.e., SrTiO3(001), MgAl2O4(001) and MgO(001), have been used for the preparation of epitaxial Fe3O4(001) films. By comparison, polycrystalline magnetite films were obtained on both single crystal Al2O3(0001) and amorphous Si/SiO2 substrates. The thickness has been varied between 50 - 400 nm. All films consist of nanocrystalline stoichiometric magnetite with very small strain (<1\%) and present the Verwey transition (Tv) between 110-120 K, i.e., close to bulk magnetite (122 K). In general, Tv depends on both microstructure and thickness, increasing mainly as the thickness increases. Room temperature angular-dependent measurements reveal an in-plane fourfold symmetry magnetic behavior for all films grown on (001)-oriented surfaces, and with the easy axes lying along the Fe3O4 [010] and [100] directions. Remarkably, the fourfold magnetic symmetry shows up to 400 nm thick films. In turn, the films grown on single crystal Al2O3 (0001) and on amorphous Si/SiO2 surfaces display an isotropic magnetic behavior. Coercive field (Hc) depends on microstructure and film thickness. The largest (lowest) Hc value corresponds to the thinner film grown on a single crystal SrTiO3(001) (amorphous Si/SiO2) surface, which present the largest (lowest) strain (crystallinity). Moreover, the coercivity follows an inverse law with film thickness. Our results demonstrate that we can artificially control the magnetic behavior of stoichiometric IR-PLD grown Fe3O4 films by exploiting substrate-induced anisotropy and thickness-controlled coercivity, that might be relevant to incorporate magnetite in future spintronic devices.

Published
2019

11. Contributors

Author

Barker, Judy, primary, Becks, Zach, additional, Bratsikhin, Andrey, additional, Brougham, P., additional, Caesar, T., additional, Cattell, D., additional, Cook, K., additional, van de Ligt, Jennifer, additional, van der Meulen, B., additional, van der Velde, M., additional, England, K., additional, Evans, Judith, additional, Fairley, M., additional, Fikiin, Kostadin, additional, Fleming, Fiona, additional, Fortin, N.D., additional, Foster, Alan M., additional, Freund, Matilda, additional, Gonçalves, Juliane Dias, additional, Graham, Don, additional, Haymerle, H., additional, Hofmann, J., additional, Holah, John, additional, Lelieveld, Huub L.M., additional, Mitenius, Ned, additional, Moerman, Frank, additional, Murray, A., additional, Nakagawa, Norikazu, additional, Omura, Hiroyuki, additional, Overbosch, Peter, additional, Pedrosa, F., additional, Satterthwaite, Katie, additional, Schmidt, Holger, additional, Schulz, K., additional, Smith, D.L., additional, Stanley, R., additional, Thys, Seppe, additional, Tyborski, T., additional, Wessel, Frank, additional, and Wouters, Patrick C., additional

Published
2023
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17. ϕ-Meson production at forward rapidity in p–Pb collisions at sNN=5.02 TeV and in pp collisions at s=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The first study of ϕ-meson production in p–Pb collisions at forward and backward rapidity, at a nucleon–nucleon centre-of-mass energy sNN=5.02 TeV, has been performed with the ALICE apparatus at the LHC. The ϕ-mesons have been identified in the dimuon decay channel in the transverse momentum (pT) range 1

Published
2017

20. Differential studies of inclusive J/ψ and ψ(2S) production at forward rapidity in Pb-Pb collisions at sNN=2.76 TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy Ion Experiments, 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 J/ψ and ψ(2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (pt) in the dimuon decay channel. Inclusive J/ψ yields were extracted in different centrality classes and the centrality dependence of the average pt is presented. The J/ψ suppression, quantified with the nuclear modification factor (RAA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/ψ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the ψ(2S) suppression are provided via the ratio of ψ(2S) over J/ψ measured in pp and Pb-Pb collisions.

Published
2016

21. Differential studies of inclusive J/ψ and ψ(2S) production at forward rapidity in Pb-Pb collisions at √sNN = 2.76 TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Heavy Ion Experiments, Quark gluon plasma, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The production of J/ψ and ψ(2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (pt) in the dimuon decay channel. Inclusive J/ψ yields were extracted in different centrality classes and the centrality dependence of the average pt is presented. The J/ψ suppression, quantified with the nuclear modification factor (RAA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/ψ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the ψ(2S) suppression are provided via the ratio of ψ(2S) over J/ψ measured in pp and Pb-Pb collisions.

Published
2016

22. Event-shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at s NN =2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Abstract

We report on results obtained with the event-shape engineering technique applied to Pb-Pb collisions at sNN=2.76 TeV. By selecting events in the same centrality interval, but with very different average flow, different initial-state conditions can be studied. We find the effect of the event-shape selection on the elliptic flow coefficient v2 to be almost independent of transverse momentum pT, which is as expected if this effect is attributable to fluctuations in the initial geometry of the system. Charged-hadron, -pion, -kaon, and -proton transverse momentum distributions are found to be harder in events with higher-than-average elliptic flow, indicating an interplay between radial and elliptic flow.

Published
2016

23. Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at s NN =2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Abstract

Transverse momentum (pT) spectra of pions, kaons, and protons up to pT=20GeV/c have been measured in Pb-Pb collisions at sNN=2.76TeV using the ALICE detector for six different centrality classes covering 0%-80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT≈3GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT>10GeV/c, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%-20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For pT

Published
2016

24. 3ΛH and 3ΛH production in Pb-Pb collisions at √sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, and Bilandzic, A

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The production of the hypertriton nuclei HΛ3 and H[U+203E]Λ-3 has been measured for the first time in Pb-Pb collisions at sNN=2.76 TeV with the ALICE experiment at LHC. The pT-integrated HΛ3 yield in one unity of rapidity, dN/dy×B.R.(HΛ3→He3,π-)=(3.86±0.77(stat.)±0.68(syst.))×10-in the 0-10% most central collisions, is consistent with the predictions from a statistical thermal model using the same temperature as for the light hadrons. The coalescence parameter B3 shows a dependence on the transverse momentum, similar to the B2 of deuterons and the B3 of 3He nuclei. The ratio of yields S3=HΛ3/(He3×Λ/p) was measured to be S3=0.60±0.13(stat.)±0.21(syst.) in 0-10% centrality events; this value is compared to different theoretical models. The measured S3 is compatible with thermal model predictions. The measured HΛ3 lifetime, τ=181-39+54(stat.)±33(syst.)ps is in agreement within 1σ with the world average value.

Published
2016

25. Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Nuclear and plasma physics
Abstract

Transverse momentum (pT) spectra of pions, kaons, and protons up to pT=20GeV/c have been measured in Pb-Pb collisions at sNN=2.76TeV using the ALICE detector for six different centrality classes covering 0%-80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT≈3GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT>10GeV/c, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%-20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For pT

Published
2016

26. Event-shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Nuclear and plasma physics
Abstract

We report on results obtained with the event-shape engineering technique applied to Pb-Pb collisions at sNN=2.76 TeV. By selecting events in the same centrality interval, but with very different average flow, different initial-state conditions can be studied. We find the effect of the event-shape selection on the elliptic flow coefficient v2 to be almost independent of transverse momentum pT, which is as expected if this effect is attributable to fluctuations in the initial geometry of the system. Charged-hadron, -pion, -kaon, and -proton transverse momentum distributions are found to be harder in events with higher-than-average elliptic flow, indicating an interplay between radial and elliptic flow.

Published
2016

27. HΛ3 and H‾Λ¯3 production in Pb–Pb collisions at sNN=2.76 TeV

Author

Collaboration, ALICE, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, 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 of the hypertriton nuclei HΛ3 and H[U+203E]Λ-3 has been measured for the first time in Pb-Pb collisions at sNN=2.76 TeV with the ALICE experiment at LHC. The pT-integrated HΛ3 yield in one unity of rapidity, dN/dy×B.R.(HΛ3→He3,π-)=(3.86±0.77(stat.)±0.68(syst.))×10-in the 0-10% most central collisions, is consistent with the predictions from a statistical thermal model using the same temperature as for the light hadrons. The coalescence parameter B3 shows a dependence on the transverse momentum, similar to the B2 of deuterons and the B3 of 3He nuclei. The ratio of yields S3=HΛ3/(He3×Λ/p) was measured to be S3=0.60±0.13(stat.)±0.21(syst.) in 0-10% centrality events; this value is compared to different theoretical models. The measured S3 is compatible with thermal model predictions. The measured HΛ3 lifetime, τ=181-39+54(stat.)±33(syst.)ps is in agreement within 1σ with the world average value.

Published
2016

28. Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmed, I, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Abstract

The production of (anti-)deuteron and (anti-)He3 nuclei in Pb-Pb collisions at sNN=2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The particle ratios, He3/d and He3/p, in Pb-Pb collisions are found to be in agreement with a common chemical freeze-out temperature of Tchem≈156 MeV. These ratios do not vary with centrality which is in agreement with the thermal-statistical model. In a coalescence approach, it excludes models in which nucleus production is proportional to the particle multiplicity and favors those in which it is proportional to the particle density instead. In addition, the observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison, the deuteron spectrum in pp collisions at s=7 TeV is also presented. While the p/π ratio is similar in pp and Pb-Pb collisions, the d/p ratio in pp collisions is found to be lower by a factor of 2.2 than in Pb-Pb collisions.

Published
2016

29. Forward-central two-particle correlations in p-Pb collisions at √sNN = 5.02 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.

Published
2016

30. Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb–Pb collisions at √sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, and Biswas, R

Subjects
LHC, ALICE experiment, Pb-Pb collisions, Heavy-flavour decay muons, Elliptic flow, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The elliptic flow, v2, of muons from heavy-flavour hadron decays at forward rapidity (2.5

Published
2016

31. Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN =2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Abstract

We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at sNN=2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with (dNch/dη)1/3. This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

Published
2016

32. Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Nuclear and plasma physics
Abstract

We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at sNN=2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with (dNch/dη)1/3. This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

Published
2016

33. Forward-central two-particle correlations in p–Pb collisions at sNN=5.02 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, 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

Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.

Published
2016

34. Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb–Pb collisions at sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, Bilandzic, A, and Biswas, R

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, LHC, ALICE experiment, Pb-Pb collisions, Heavy-flavour decay muons, Elliptic flow, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract

The elliptic flow, v2, of muons from heavy-flavour hadron decays at forward rapidity (2.5

Published
2016

35. Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmed, I, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

Published
2016

36. Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at sNN=2.76 TeV

Author

Collaboration, ALICE, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmed, I, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, 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

We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

Published
2016

38. Coherent ψ(2S) photo-production in ultra-peripheral Pb–Pb collisions at √sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, and Bilandzic, A

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9

Published
2015

39. Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sNN=2.76 TeV

Author

Collaboration, ALICE, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, 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

We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9

Published
2015

40. One-dimensional pion, kaon, and proton femtoscopy in Pb-Pb collisions at s NN =2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, and Bilandzic, A

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of π±π±,K±K±,KS0KS0,pp, and p¯p¯ correlations from Pb-Pb collisions at sNN=2.76 TeV by the ALICE experiment at the LHC. One-dimensional radii of the system are extracted from correlation functions in terms of the invariant momentum difference of the pair. The comparison of the measured radii with the predictions from a hydrokinetic model is discussed. The pion and kaon source radii display a monotonic decrease with increasing average pair transverse mass mT which is consistent with hydrodynamic model predictions for central collisions. The kaon and proton source sizes can be reasonably described by approximate mT scaling. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published
2015

41. One-dimensional pion, kaon, and proton femtoscopy in Pb-Pb collisions at sNN=2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Dos Santos Pedrosa, F Baltasar, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, Bielčíková, J, and Bilandzic, A

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Nuclear and plasma physics
Abstract

The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of π±π±,K±K±,KS0KS0,pp, and p¯p¯ correlations from Pb-Pb collisions at sNN=2.76 TeV by the ALICE experiment at the LHC. One-dimensional radii of the system are extracted from correlation functions in terms of the invariant momentum difference of the pair. The comparison of the measured radii with the predictions from a hydrokinetic model is discussed. The pion and kaon source radii display a monotonic decrease with increasing average pair transverse mass mT which is consistent with hydrodynamic model predictions for central collisions. The kaon and proton source sizes can be reasonably described by approximate mT scaling. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published
2015

42. Centrality dependence of high-pT D meson suppression in Pb-Pb collisions at sNN=2.76 TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Charm physics, Heavy Ions, Heavy-ion collision, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract

Abstract: The nuclear modification factor, RAA, of the prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass energy sNN=2.76(Formula presented.) TeV in two transverse momentum intervals, 5 < pT< 8 GeV/c and 8 < pT< 16 GeV/c, and in six collision centrality classes. The RAA shows a maximum suppression of a factor of 5-6 in the 10% most central collisions. The suppression and its centrality dependence are compatible within uncertainties with those of charged pions. A comparison with the RAA of non-prompt J/ψ from B meson decays, measured by the CMS Collaboration, hints at a larger suppression of D mesons in the most central collisions.[Figure not available: see fulltext.]

Published
2015

43. Centrality dependence of inclusive J/ψ production in p-Pb collisions at sNN=5.02 TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Quark gluon plasma, QCD, Heavy Ions, 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

Abstract: We present a measurement of inclusive J/ψ production in p-Pb collisions at sNN=5.02(Formula presented.) TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, pT, in the backward (−4.46 < ycms< −2.96) and forward (2.03 < ycms< 3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (−1.37 < ycms< 0.43) in the dielectron decay channel. The backward and forward rapidity intervals correspond to the Pb-going and p-going direction, respectively. The pT-differential J/ψ production cross section at backward and forward rapidity is measured for several centrality classes, together with the corresponding average pT and pT2 values. The nuclear modification factor is presented as a function of centrality for the three rapidity intervals, and as a function of pT for several centrality classes at backward and forward rapidity. At mid- and forward rapidity, the J/ψ yield is suppressed up to 40% compared to that in pp interactions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions at forward rapidity, and with decreasing pT of the J/ψ. At backward rapidity, the nuclear modification factor is compatible with unity within the total uncertainties, with an increasing trend from peripheral to central p-Pb collisions.[Figure not available: see fulltext.]

Published
2015

44. Centrality dependence of inclusive J/ψ production in p-Pb collisions at (Formula presented.) TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Quark gluon plasma, QCD, Heavy Ions, Genetics, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Abstract: We present a measurement of inclusive J/ψ production in p-Pb collisions at sNN=5.02(Formula presented.) TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, pT, in the backward (−4.46 < ycms< −2.96) and forward (2.03 < ycms< 3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (−1.37 < ycms< 0.43) in the dielectron decay channel. The backward and forward rapidity intervals correspond to the Pb-going and p-going direction, respectively. The pT-differential J/ψ production cross section at backward and forward rapidity is measured for several centrality classes, together with the corresponding average pT and pT2 values. The nuclear modification factor is presented as a function of centrality for the three rapidity intervals, and as a function of pT for several centrality classes at backward and forward rapidity. At mid- and forward rapidity, the J/ψ yield is suppressed up to 40% compared to that in pp interactions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions at forward rapidity, and with decreasing pT of the J/ψ. At backward rapidity, the nuclear modification factor is compatible with unity within the total uncertainties, with an increasing trend from peripheral to central p-Pb collisions.[Figure not available: see fulltext.]

Published
2015

45. Centrality dependence of high-pT D meson suppression in Pb-Pb collisions at (Formula presented.) TeV

Author

The ALICE collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz, JRM, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, and Bielčík, J

Subjects
Charm physics, Heavy Ions, Heavy-ion collision, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Abstract: The nuclear modification factor, RAA, of the prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass energy sNN=2.76(Formula presented.) TeV in two transverse momentum intervals, 5 < pT< 8 GeV/c and 8 < pT< 16 GeV/c, and in six collision centrality classes. The RAA shows a maximum suppression of a factor of 5-6 in the 10% most central collisions. The suppression and its centrality dependence are compatible within uncertainties with those of charged pions. A comparison with the RAA of non-prompt J/ψ from B meson decays, measured by the CMS Collaboration, hints at a larger suppression of D mesons in the most central collisions.[Figure not available: see fulltext.]

Published
2015

46. Measurement of pion, kaon and proton production in proton–proton collisions at s=7 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmed, I, Ahn, SU, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, R Alfaro, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, C Alves Garcia, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Pedrosa, F Baltasar Dos Santos, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartalini, P, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, A Batista, Batyunya, B, Batzing, PC, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Martinez, H Bello, Bellwied, R, Belmont, R, Belmont-Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielčík, J, and Bielčíková, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, ALICE Collaboration, 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 measurement of primary [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] production at mid-rapidity ([Formula: see text] 0.5) in proton-proton collisions at [Formula: see text][Formula: see text] 7 TeV performed with a large ion collider experiment at the large hadron collider (LHC) is reported. Particle identification is performed using the specific ionisation energy-loss and time-of-flight information, the ring-imaging Cherenkov technique and the kink-topology identification of weak decays of charged kaons. Transverse momentum spectra are measured from 0.1 up to 3 GeV/[Formula: see text] for pions, from 0.2 up to 6 GeV/[Formula: see text] for kaons and from 0.3 up to 6 GeV/[Formula: see text] for protons. The measured spectra and particle ratios are compared with quantum chromodynamics-inspired models, tuned to reproduce also the earlier measurements performed at the LHC. Furthermore, the integrated particle yields and ratios as well as the average transverse momenta are compared with results at lower collision energies.

Published
2015

47. Inclusive photon production at forward rapidities in proton–proton collisions at s = 0.9, 2.76 and 7 TeV

Author

ALICE Collaboration, Abelev, B, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Ahmed, I, Ahn, SU, Ahn, SA, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Awes, TC, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartke, J, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Baumann, C, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bellwied, R, Belmont-Moreno, E, Belmont, R, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Berger, ME, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, and Bianchin, C

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 and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

Published
2015

48. Inclusive photon production at forward rapidities in proton–proton collisions at √s = 0.9, 2.76 and 7 TeV

Author

ALICE Collaboration, Abelev, B, Adam, J, Adamová, D, Aggarwal, MM, Rinella, GA, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Ahmed, I, Ahn, SU, Ahn, SA, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Awes, TC, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartke, J, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Baumann, C, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bellwied, R, Belmont-Moreno, E, Belmont, R, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Berger, ME, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, and Bianchin, C

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

Published
2015

49. Production of [Formula: see text] and [Formula: see text] in proton-proton collisions at [Formula: see text] 7 TeV.

Author

ALICE Collaboration, Abelev, B, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Ahmed, I, Ahn, SU, Ahn, SA, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Awes, TC, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartke, J, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Baumann, C, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bellwied, R, Belmont-Moreno, E, Belmont, R, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Berger, ME, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, and Bianchin, C

Subjects
ALICE Collaboration, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The production of the strange and double-strange baryon resonances ([Formula: see text], [Formula: see text]) has been measured at mid-rapidity ([Formula: see text][Formula: see text]) in proton-proton collisions at [Formula: see text] [Formula: see text] 7 TeV with the ALICE detector at the LHC. Transverse momentum spectra for inelastic collisions are compared to QCD-inspired models, which in general underpredict the data. A search for the [Formula: see text] pentaquark, decaying in the [Formula: see text] channel, has been carried out but no evidence is seen.

Published
2015

50. Production of Σ(1385)± and Ξ(1530)0 in proton–proton collisions at s= 7 TeV

Author

ALICE Collaboration, Abelev, B, Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Ahmed, I, Ahn, SU, Ahn, SA, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, SN, Aleksandrov, D, Alessandro, B, Alexandre, D, Alici, A, Alkin, A, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Alves Garcia Prado, C, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, IC, Arslandok, M, Augustinus, A, Averbeck, R, Awes, TC, Azmi, MD, Bach, M, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baltasar Dos Santos Pedrosa, F, Baral, RC, Barbera, R, Barile, F, Barnaföldi, GG, Barnby, LS, Barret, V, Bartke, J, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Batista Camejo, A, Batyunya, B, Batzing, PC, Baumann, C, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bellwied, R, Belmont-Moreno, E, Belmont, R, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Berger, ME, Bertens, RA, Berzano, D, Betev, L, Bhasin, A, Bhat, IR, Bhati, AK, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, and Bianchin, C

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, ALICE Collaboration, 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 production of the strange and double-strange baryon resonances ([Formula: see text], [Formula: see text]) has been measured at mid-rapidity ([Formula: see text][Formula: see text]) in proton-proton collisions at [Formula: see text] [Formula: see text] 7 TeV with the ALICE detector at the LHC. Transverse momentum spectra for inelastic collisions are compared to QCD-inspired models, which in general underpredict the data. A search for the [Formula: see text] pentaquark, decaying in the [Formula: see text] channel, has been carried out but no evidence is seen.

Published
2015

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