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301. Measurement of azimuthal correlations of D mesons with charged particles in pp collisions at [Formula: see text] TeV and p-Pb collisions at [Formula: see text] TeV.

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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
ALICE Collaboration, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The azimuthal correlations of D mesons with charged particles were measured with the ALICE apparatus in pp collisions at [Formula: see text] and p-Pb collisions at [Formula: see text] at the Large Hadron Collider. [Formula: see text], [Formula: see text], and [Formula: see text] mesons and their charge conjugates with transverse momentum [Formula: see text] and rapidity in the nucleon-nucleon centre-of-mass system [Formula: see text] (pp collisions) and [Formula: see text] (p-Pb collisions) were correlated to charged particles with [Formula: see text]. The yield of charged particles in the correlation peak induced by the jet containing the D meson and the peak width are compatible within uncertainties in the two collision systems. The data are described within uncertainties by Monte-Carlo simulations based on PYTHIA, POWHEG, and EPOS 3 event generators.

Published
2017

302. Production of [Formula: see text] and [Formula: see text] in p-Pb collisions at [Formula: see text] TeV.

Author

Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, An, M, Andrei, C, Andrews, HA, Andronic, A, Anguelov, V, Anson, C, Antičić, T, Antinori, F, Antonioli, P, Anwar, R, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barioglio, L, 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, Beltran, LGE, Belyaev, V, Bencedi, G, Beole, S, 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
ALICE Collaboration, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The transverse momentum distributions of the strange and double-strange hyperon resonances ([Formula: see text], [Formula: see text]) produced in p-Pb collisions at [Formula: see text] TeV were measured in the rapidity range [Formula: see text] for event classes corresponding to different charged-particle multiplicity densities, [Formula: see text]d[Formula: see text]/d[Formula: see text]. The mean transverse momentum values are presented as a function of [Formula: see text]d[Formula: see text]/d[Formula: see text], as well as a function of the particle masses and compared with previous results on hyperon production. The integrated yield ratios of excited to ground-state hyperons are constant as a function of [Formula: see text]d[Formula: see text]/d[Formula: see text]. The equivalent ratios to pions exhibit an increase with [Formula: see text]d[Formula: see text]/d[Formula: see text], depending on their strangeness content.

Published
2017

303. Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, An, M, Andrei, C, Andrews, HA, Andronic, A, Anguelov, V, Anson, C, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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-Moreno, E, Beltran, LGE, 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 measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8>pTtrig>16 GeV/c and associated charged particles of 0.5>pTassoc>10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb–Pb collisions at sNN=2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v2 to v5, the per-trigger yields are extracted for |Δφ|>0.7 on the near and for |Δφ−π|>1.1 on the away side. The ratio of per-trigger yields in Pb–Pb to those in pp collisions, IAA, is measured on the near and away side for the 0–10% most central Pb–Pb collisions. On the away side, the per-trigger yields in Pb–Pb are strongly suppressed to the level of IAA≈0.6 for pTassoc

Published
2016

305. D-meson production in p-Pb collisions at s NN =5.02 TeV and in pp collisions at s =7 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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 Biro, G

Abstract

Background: In the context of the investigation of the quark gluon plasma produced in heavy-ion collisions, hadrons containing heavy (charm or beauty) quarks play a special role for the characterization of the hot and dense medium created in the interaction. The measurement of the production of charm and beauty hadrons in proton-proton collisions, besides providing the necessary reference for the studies in heavy-ion reactions, constitutes an important test of perturbative quantum chromodynamics (pQCD) calculations. Heavy-flavor production in proton-nucleus collisions is sensitive to the various effects related to the presence of nuclei in the colliding system, commonly denoted cold-nuclear-matter effects. Most of these effects are expected to modify open-charm production at low transverse momenta (pT) and, so far, no measurement of D-meson production down to zero transverse momentum was available at mid-rapidity at the energies attained at the CERN Large Hadron Collider (LHC). Purpose: The measurements of the production cross sections of promptly produced charmed mesons in p-Pb collisions at the LHC down to pT=0 and the comparison to the results from pp interactions are aimed at the assessment of cold-nuclear-matter effects on open-charm production, which is crucial for the interpretation of the results from Pb-Pb collisions. Methods: The prompt charmed mesons D0,D+,D∗+, and Ds+ were measured at mid-rapidity in p-Pb collisions at a center-of-mass energy per nucleon pair sNN=5.02 TeV with the ALICE detector at the LHC. D mesons were reconstructed from their decays D0→K-π+,D+→K-π+π+, D∗+→D0π+,Ds+→φπ+→K-K+π+, and their charge conjugates, using an analysis method based on the selection of decay topologies displaced from the interaction vertex. In addition, the prompt D0 production cross section was measured in pp collisions at s=7 TeV and p-Pb collisions at sNN=5.02 TeV down to pT=0 using an analysis technique that is based on the estimation and subtraction of the combinatorial background, without reconstruction of the D0 decay vertex. Results: The production cross section in pp collisions is described within uncertainties by different implementations of pQCD calculations down to pT=0. This allowed also a determination of the total cc production cross section in pp collisions, which is more precise than previous ALICE measurements because it is not affected by uncertainties owing to the extrapolation to pT=0. The nuclear modification factor RpPb(pT), defined as the ratio of the pT-differential D meson cross section in p-Pb collisions and that in pp collisions scaled by the mass number of the Pb nucleus, was calculated for the four D-meson species and found to be compatible with unity within uncertainties. The results are compared to theoretical calculations that include cold-nuclear-matter effects and to transport model calculations incorporating the interactions of charm quarks with an expanding deconfined medium. Conclusions: These measurements add experimental evidence that the modification of the D-meson transverse momentum distributions observed in Pb-Pb collisions with respect to pp interactions is due to strong final-state effects induced by the interactions of the charm quarks with the hot and dense partonic medium created in ultrarelativistic heavy-ion collisions. The current precision of the measurement does not allow us to draw conclusions on the role of the different cold-nuclear-matter effects and on the possible presence of additional hot-medium effects in p-Pb collisions. However, the analysis technique without decay-vertex reconstruction, applied on future larger data samples, should provide access to the physics-rich range down to pT=0.

Published
2016

306. Pseudorapidity dependence of the anisotropic flow of charged particles 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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 present measurements of the elliptic (v2), triangular (v3) and quadrangular (v4) anisotropic azimuthal flow over a wide range of pseudorapidities (−3.5

Published
2016

307. D-meson production in p-Pb collisions at sNN=5.02 TeV and in pp collisions at s=7 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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 Biro, G

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

Background: In the context of the investigation of the quark gluon plasma produced in heavy-ion collisions, hadrons containing heavy (charm or beauty) quarks play a special role for the characterization of the hot and dense medium created in the interaction. The measurement of the production of charm and beauty hadrons in proton-proton collisions, besides providing the necessary reference for the studies in heavy-ion reactions, constitutes an important test of perturbative quantum chromodynamics (pQCD) calculations. Heavy-flavor production in proton-nucleus collisions is sensitive to the various effects related to the presence of nuclei in the colliding system, commonly denoted cold-nuclear-matter effects. Most of these effects are expected to modify open-charm production at low transverse momenta (pT) and, so far, no measurement of D-meson production down to zero transverse momentum was available at mid-rapidity at the energies attained at the CERN Large Hadron Collider (LHC). Purpose: The measurements of the production cross sections of promptly produced charmed mesons in p-Pb collisions at the LHC down to pT=0 and the comparison to the results from pp interactions are aimed at the assessment of cold-nuclear-matter effects on open-charm production, which is crucial for the interpretation of the results from Pb-Pb collisions. Methods: The prompt charmed mesons D0,D+,D∗+, and Ds+ were measured at mid-rapidity in p-Pb collisions at a center-of-mass energy per nucleon pair sNN=5.02 TeV with the ALICE detector at the LHC. D mesons were reconstructed from their decays D0→K-π+,D+→K-π+π+, D∗+→D0π+,Ds+→φπ+→K-K+π+, and their charge conjugates, using an analysis method based on the selection of decay topologies displaced from the interaction vertex. In addition, the prompt D0 production cross section was measured in pp collisions at s=7 TeV and p-Pb collisions at sNN=5.02 TeV down to pT=0 using an analysis technique that is based on the estimation and subtraction of the combinatorial background, without reconstruction of the D0 decay vertex. Results: The production cross section in pp collisions is described within uncertainties by different implementations of pQCD calculations down to pT=0. This allowed also a determination of the total cc production cross section in pp collisions, which is more precise than previous ALICE measurements because it is not affected by uncertainties owing to the extrapolation to pT=0. The nuclear modification factor RpPb(pT), defined as the ratio of the pT-differential D meson cross section in p-Pb collisions and that in pp collisions scaled by the mass number of the Pb nucleus, was calculated for the four D-meson species and found to be compatible with unity within uncertainties. The results are compared to theoretical calculations that include cold-nuclear-matter effects and to transport model calculations incorporating the interactions of charm quarks with an expanding deconfined medium. Conclusions: These measurements add experimental evidence that the modification of the D-meson transverse momentum distributions observed in Pb-Pb collisions with respect to pp interactions is due to strong final-state effects induced by the interactions of the charm quarks with the hot and dense partonic medium created in ultrarelativistic heavy-ion collisions. The current precision of the measurement does not allow us to draw conclusions on the role of the different cold-nuclear-matter effects and on the possible presence of additional hot-medium effects in p-Pb collisions. However, the analysis technique without decay-vertex reconstruction, applied on future larger data samples, should provide access to the physics-rich range down to pT=0.

Published
2016

308. Measurement of transverse energy at midrapidity 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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 Biro, G

Abstract

We report the transverse energy (ET) measured with ALICE at midrapidity in Pb-Pb collisions at sNN=2.76 TeV as a function of centrality. The transverse energy was measured using identified single-particle tracks. The measurement was cross checked using the electromagnetic calorimeters and the transverse momentum distributions of identified particles previously reported by ALICE. The results are compared to theoretical models as well as to results from other experiments. The mean ET per unit pseudorapidity (η), (dET/dη), in 0%-5% central collisions is 1737±6(stat.)±97(sys.) GeV. We find a similar centrality dependence of the shape of (dET/dη) as a function of the number of participating nucleons to that seen at lower energies. The growth in (dET/dη) at the LHC energies exceeds extrapolations of low-energy data. We observe a nearly linear scaling of (dET/dη) with the number of quark participants. With the canonical assumption of a 1 fm/c formation time, we estimate that the energy density in 0%-5% central Pb-Pb collisions at sNN=2.76 TeV is 12.3±1.0GeV/fm3 and that the energy density at the most central 80fm2 of the collision is at least 21.5±1.7GeV/fm3. This is roughly 2.3 times that observed in 0%-5% central Au-Au collisions at sNN=200 GeV.

Published
2016

309. Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum 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, Ahmad, S, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

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

The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (−0.510 GeV/c), the particle ratios are consistent with those reported for pp and Pb–Pb collisions at the LHC energies. At intermediate pT the (anti)proton RpPb shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high pT the charged pion, kaon and (anti)proton RpPb are consistent with unity within statistical and systematic uncertainties.

Published
2016

310. Measurement of transverse energy at midrapidity 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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 Biro, G

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

We report the transverse energy (ET) measured with ALICE at midrapidity in Pb-Pb collisions at sNN=2.76 TeV as a function of centrality. The transverse energy was measured using identified single-particle tracks. The measurement was cross checked using the electromagnetic calorimeters and the transverse momentum distributions of identified particles previously reported by ALICE. The results are compared to theoretical models as well as to results from other experiments. The mean ET per unit pseudorapidity (η), (dET/dη), in 0%-5% central collisions is 1737±6(stat.)±97(sys.) GeV. We find a similar centrality dependence of the shape of (dET/dη) as a function of the number of participating nucleons to that seen at lower energies. The growth in (dET/dη) at the LHC energies exceeds extrapolations of low-energy data. We observe a nearly linear scaling of (dET/dη) with the number of quark participants. With the canonical assumption of a 1 fm/c formation time, we estimate that the energy density in 0%-5% central Pb-Pb collisions at sNN=2.76 TeV is 12.3±1.0GeV/fm3 and that the energy density at the most central 80fm2 of the collision is at least 21.5±1.7GeV/fm3. This is roughly 2.3 times that observed in 0%-5% central Au-Au collisions at sNN=200 GeV.

Published
2016

311. Higher harmonic flow coefficients of identified hadrons 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, An, M, Andrei, C, Andrews, HA, Andronic, A, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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, Hadron-Hadron scattering, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract

The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p + p ¯ in Pb-Pb collisions at sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.[Figure not available: see fulltext.]

Published
2016

312. Higher harmonic flow coefficients of identified hadrons 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, An, M, Andrei, C, Andrews, HA, Andronic, A, Anguelov, V, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Beltran, LGE, 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
Hadron-Hadron scattering, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p + p ¯ in Pb-Pb collisions at sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.[Figure not available: see fulltext.]

Published
2016

313. Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum 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, Ahmad, S, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

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

The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (−0.510 GeV/c), the particle ratios are consistent with those reported for pp and Pb–Pb collisions at the LHC energies. At intermediate pT the (anti)proton RpPb shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high pT the charged pion, kaon and (anti)proton RpPb are consistent with unity within statistical and systematic uncertainties.

Published
2016

314. Multi-strange baryon production 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, Ahmad, S, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 multi-strange baryon yields in Pb-Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in p-Pb collisions at a centre-of-mass energy of sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c

Published
2016

315. Multi-strange baryon production in pPb collisions at sNN=5.02 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract

The multi-strange baryon yields in Pb-Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in p-Pb collisions at a centre-of-mass energy of sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c

Published
2016

316. Centrality dependence of ψ(2S) suppression 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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 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 inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Published
2016

317. Centrality dependence of ψ(2S) suppression 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, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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 Biro, G

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

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Published
2016

318. Multipion Bose-Einstein correlations in pp,p -Pb, 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, Ahmad, S, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

Abstract

Three- and four-pion Bose-Einstein correlations are presented in pp,p-Pb, and Pb-Pb collisions at the LHC. We compare our measured four-pion correlations to the expectation derived from two- and three-pion measurements. Such a comparison provides a method to search for coherent pion emission. We also present mixed-charge correlations in order to demonstrate the effectiveness of several analysis procedures such as Coulomb corrections. Same-charge four-pion correlations in pp and p-Pb appear consistent with the expectations from three-pion measurements. However, the presence of non-negligible background correlations in both systems prevent a conclusive statement. In Pb-Pb collisions, we observe a significant suppression of three- and four-pion Bose-Einstein correlations compared to expectations from two-pion measurements. There appears to be no centrality dependence of the suppression within the 0%-50% centrality interval. The origin of the suppression is not clear. However, by postulating either coherent pion emission or large multibody Coulomb effects, the suppression may be explained.

Published
2016

319. Centrality dependence of charged jet production in p–Pb collisions at sNN = 5.02 TeV

Author

Alice Collaboration, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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 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

Measurements of charged jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the charged jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial jet structure in the reported centrality classes.

Published
2016

320. 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

321. Production of K∗(892)0 and ϕ(1020) 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, Ahmad, S, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

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 K[Formula: see text](892)[Formula: see text] and [Formula: see text](1020) mesons has been measured in p-Pb collisions at [Formula: see text][Formula: see text] 5.02 TeV. K[Formula: see text] and [Formula: see text] are reconstructed via their decay into charged hadrons with the ALICE detector in the rapidity range [Formula: see text]. The transverse momentum spectra, measured as a function of the multiplicity, have a p[Formula: see text] range from 0 to 15 GeV/c for K[Formula: see text] and from 0.3 to 21 GeV/c for [Formula: see text]. Integrated yields, mean transverse momenta and particle ratios are reported and compared with results in pp collisions at [Formula: see text][Formula: see text] 7 TeV and Pb-Pb collisions at [Formula: see text][Formula: see text] 2.76 TeV. In Pb-Pb and p-Pb collisions, K[Formula: see text] and [Formula: see text] probe the hadronic phase of the system and contribute to the study of particle formation mechanisms by comparison with other identified hadrons. For this purpose, the mean transverse momenta and the differential proton-to-[Formula: see text] ratio are discussed as a function of the multiplicity of the event. The short-lived K[Formula: see text] is measured to investigate re-scattering effects, believed to be related to the size of the system and to the lifetime of the hadronic phase.

Published
2016

322. 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

323. Charge-dependent flow and the search for the chiral magnetic wave 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

Abstract

We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow.

Published
2016

324. Charge-dependent flow and the search for the chiral magnetic wave 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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 Biro, G

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

We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow.

Published
2016

325. Anisotropic Flow of Charged Particles in Pb-Pb Collisions at sNN=5.02 TeV

Author

Adam, J, Adamová, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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, ALICE Collaboration, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

We report the first results of elliptic (v_{2}), triangular (v_{3}), and quadrangular (v_{4}) flow of charged particles in Pb-Pb collisions at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the CERN Large Hadron Collider. The measurements are performed in the central pseudorapidity region |η|

Published
2016

326. Inclusive quarkonium production at forward rapidity in pp collisions at s=8TeV

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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, Biswas, S, and Bjelogrlic, S

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

We report on the inclusive production cross sections of [Formula: see text], [Formula: see text], [Formula: see text](1S), [Formula: see text](2S) and [Formula: see text](3S), measured at forward rapidity with the ALICE detector in [Formula: see text] collisions at a center-of-mass energy [Formula: see text] TeV. The analysis is based on data collected at the LHC and corresponds to an integrated luminosity of 1.23 pb[Formula: see text]. Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum [Formula: see text] and rapidity y, over the [Formula: see text] ranges [Formula: see text] GeV/c for [Formula: see text], [Formula: see text] GeV/c for all other resonances, and for [Formula: see text]. The cross sections, integrated over [Formula: see text] and y, and assuming unpolarized quarkonia, are [Formula: see text] [Formula: see text]b, [Formula: see text] [Formula: see text]b, [Formula: see text] nb, [Formula: see text] nb and [Formula: see text] nb, where the first uncertainty is statistical and the second one is systematic. These values agree, within at most [Formula: see text], with measurements performed by the LHCb collaboration in the same rapidity range.

Published
2016

327. Anisotropic Flow of Charged Particles in Pb-Pb Collisions at √[s{NN}]=5.02 TeV.

Author

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S, Akindinov, A, Alam, SN, Albuquerque, DSD, 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, Antičić, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshäuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Benacek, P, 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
ALICE Collaboration, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We report the first results of elliptic (v_{2}), triangular (v_{3}), and quadrangular (v_{4}) flow of charged particles in Pb-Pb collisions at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the CERN Large Hadron Collider. The measurements are performed in the central pseudorapidity region |η|

Published
2016

328. 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

329. 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

330. Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

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

The centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at √sNN=2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. The broad pseudorapidity range (-3.5

Published
2016

331. Measurement of electrons from heavy-flavour hadron decays in p–Pb collisions at √sNN=5.02TeV

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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, Biswas, S, and Bjelogrlic, S

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

The production of electrons from heavy-flavour hadron decays was measured as a function of transverse momentum (pT) in minimum-bias p–Pb collisions at sNN=5.02 TeV using the ALICE detector at the LHC. The measurement covers the pT interval 0.5

Published
2016

332. 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

333. 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

334. 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

335. Measurement of electrons from heavy-flavour hadron decays in p–Pb collisions at sNN=5.02TeV

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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, Biswas, S, and Bjelogrlic, S

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 electrons from heavy-flavour hadron decays was measured as a function of transverse momentum (pT) in minimum-bias p–Pb collisions at sNN=5.02 TeV using the ALICE detector at the LHC. The measurement covers the pT interval 0.5

Published
2016

336. Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, Biswas, S, and Bjelogrlic, S

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 centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at √sNN=2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. The broad pseudorapidity range (-3.5

Published
2016

337. 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

338. Measurement of Ds+ production and nuclear modification factor 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, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Hadron-Hadron scattering, 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 prompt Ds+ mesons was measured for the first time in collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV in two different centrality classes, namely 0–10% and 20–50%. Ds+ mesons and their antiparticles were reconstructed at mid-rapidity from their hadronic decay channel Ds+ → ϕπ+, with ϕ → K−K+, in the transverse momentum intervals 4 < pT < 12GeV/c and 6 < pT < 12 GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-differential production yields in Pb-Pb collisions to those in proton-proton (pp) collisions at the same energy. This pp reference was obtained using the cross section measured at (Formula presented.) TeV and scaled to (Formula presented.) TeV. The RAA of Ds+ mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 < pT < 12 GeV/c) a suppression of the Ds+-meson yield by a factor of about three, compatible within uncertainties with that of non-strange D mesons, is observed. At lower pT (4 < pT < 8 GeV/c) the values of the Ds+-meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios Ds+/D0 and Ds+/D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

Published
2016

339. Transverse momentum dependence of D-meson production 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, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Heavy ion Experiments, Quark gluon plasma, Charm physics, 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 prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV. The production yields for rapidity |y| < 0.5 are presented as a function of transverse momentum, pT, in the interval 1–36 GeV/c for the centrality class 0–10% and in the interval 1–16 GeV/c for the centrality class 30–50%. The nuclear modification factor RAA was computed using a proton-proton reference at (Formula presented.) TeV, based on measurements at (Formula presented.) TeV and on theoretical calculations. A maximum suppression by a factor of 5-6 with respect to binary-scaled pp yields is observed for the most central collisions at pT of about 10 GeV/c. A suppression by a factor of about 2-3 persists at the highest pT covered by the measurements. At low pT (1-3 GeV/c), the RAA has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all pT intervals, the RAA is larger in the 30-50% centrality class compared to central collisions. The D-meson RAA is also compared with that of charged pions and, at large pT, charged hadrons, and with model calculations.

Published
2016

340. Measurement of Ds+ production and nuclear modification factor 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, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

Subjects
Hadron-Hadron scattering, Heavy ion Experiments, Quark gluon plasma, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The production of prompt Ds+ mesons was measured for the first time in collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV in two different centrality classes, namely 0–10% and 20–50%. Ds+ mesons and their antiparticles were reconstructed at mid-rapidity from their hadronic decay channel Ds+ → ϕπ+, with ϕ → K−K+, in the transverse momentum intervals 4 < pT < 12GeV/c and 6 < pT < 12 GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-differential production yields in Pb-Pb collisions to those in proton-proton (pp) collisions at the same energy. This pp reference was obtained using the cross section measured at (Formula presented.) TeV and scaled to (Formula presented.) TeV. The RAA of Ds+ mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 < pT < 12 GeV/c) a suppression of the Ds+-meson yield by a factor of about three, compatible within uncertainties with that of non-strange D mesons, is observed. At lower pT (4 < pT < 8 GeV/c) the values of the Ds+-meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios Ds+/D0 and Ds+/D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

Published
2016

341. Transverse momentum dependence of D-meson production 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, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

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

The production of prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV. The production yields for rapidity |y| < 0.5 are presented as a function of transverse momentum, pT, in the interval 1–36 GeV/c for the centrality class 0–10% and in the interval 1–16 GeV/c for the centrality class 30–50%. The nuclear modification factor RAA was computed using a proton-proton reference at (Formula presented.) TeV, based on measurements at (Formula presented.) TeV and on theoretical calculations. A maximum suppression by a factor of 5-6 with respect to binary-scaled pp yields is observed for the most central collisions at pT of about 10 GeV/c. A suppression by a factor of about 2-3 persists at the highest pT covered by the measurements. At low pT (1-3 GeV/c), the RAA has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all pT intervals, the RAA is larger in the 30-50% centrality class compared to central collisions. The D-meson RAA is also compared with that of charged pions and, at large pT, charged hadrons, and with model calculations.

Published
2016

342. 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

343. Pseudorapidity and transverse-momentum distributions of charged particles in proton–proton collisions at √s=13 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Biswas, R, and Biswas, S

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

The pseudorapidity (η) and transverse-momentum (pT) distributions of charged particles produced in proton–proton collisions are measured at the centre-of-mass energy s=13 TeV. The pseudorapidity distribution in |η|

Published
2016

344. 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

345. 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

346. Azimuthal anisotropy of charged jet production in √sNN=2.76 TeV Pb–Pb collisions

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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, Biswas, S, and Bjelogrlic, S

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

We present measurements of the azimuthal dependence of charged jet production in central and semi-central sNN=2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as v2ch jet. Jet finding is performed employing the anti-kT algorithm with a resolution parameter R=0.2 using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero v2ch jet is observed in semi-central collisions (30–50% centrality) for 20

Published
2016

347. 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

348. 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

349. Multiplicity and transverse momentum evolution of charge-dependent correlations in pp, p–Pb, and Pb–Pb collisions at the LHC

Author

ALICE Collaboration, 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, 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, Biswas, R, and Biswas, S

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

We report on two-particle charge-dependent correlations in pp, p-Pb, and Pb-Pb collisions as a function of the pseudorapidity and azimuthal angle difference, [Formula: see text] and [Formula: see text] respectively. These correlations are studied using the balance function that probes the charge creation time and the development of collectivity in the produced system. The dependence of the balance function on the event multiplicity as well as on the trigger and associated particle transverse momentum ([Formula: see text]) in pp, p-Pb, and Pb-Pb collisions at [Formula: see text] 7, 5.02, and 2.76 TeV, respectively, are presented. In the low transverse momentum region, for [Formula: see text] GeV/c, the balance function becomes narrower in both [Formula: see text] and [Formula: see text] directions in all three systems for events with higher multiplicity. The experimental findings favor models that either incorporate some collective behavior (e.g. AMPT) or different mechanisms that lead to effects that resemble collective behavior (e.g. PYTHIA8 with color reconnection). For higher values of transverse momenta the balance function becomes even narrower but exhibits no multiplicity dependence, indicating that the observed narrowing with increasing multiplicity at low [Formula: see text] is a feature of bulk particle production.

Published
2016

350. Pseudorapidity and transverse-momentum distributions of charged particles in proton–proton collisions at s=13 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, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badalà, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Balasubramanian, S, Baldisseri, A, 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, Biswas, R, and Biswas, S

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

The pseudorapidity (η) and transverse-momentum (pT) distributions of charged particles produced in proton–proton collisions are measured at the centre-of-mass energy s=13 TeV. The pseudorapidity distribution in |η|

Published
2016

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