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arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carena, W. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) n(D0) n(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6-8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry. Copyright © 2018, The Authors. All rights reserved.

关键词： Bosons

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Measurements of low-pT electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb–Pb collisions at √sNN = 2.76 TeV

arXiv

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arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfaro Molina, R. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arnold, O.W. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carena, F. Carena, W. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Chandra, S. Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

Transverse-momentum (pT) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at √sNN = 2.76 TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|y| T interval 0.5–3 GeV/c via the nuclear modification factor, RAA. This paper extends the pT reach of the RAA measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the pT-differential measurements of yields at low pT are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution. Copyright © 2018, The Authors. All rights reserved.

关键词： Distribution functions

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Analysis of the apparent nuclear modification in peripheral Pb–Pb collisions at 5.02 TeV

arXiv

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arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfaro Molina, R. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arnold, O.W. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carena, F. Carena, W. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Chandra, S. Deceased Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento d

Charged-particle spectra at midrapidity are measured in Pb–Pb collisions at the centre-of-mass energy per nucleon–nucleon pair √sNN = 5.02 TeV and presented in centrality classes ranging from most central (0–5%) to most peripheral (95–100%) collisions. Possible medium effects are quantified using the nuclear modification factor (RAA) by comparing the measured spectra with those from proton–proton collisions, scaled by the number of independent nucleon–nucleon collisions obtained from a Glauber model. At large transverse momenta (8 T AA is found to increase from about 0.15 in 0–5% central to a maximum value of about 0.8 in 75–85% peripheral collisions, beyond which it falls off strongly to below 0.2 for the most peripheral collisions. Furthermore, RAA initially exhibits a positive slope as a function of pT in the 8–20 GeV/c interval, while for collisions beyond the 80% class the slope is negative. To reduce uncertainties related to event selection and normalization, we also provide the ratio of RAA in adjacent centrality intervals. Our results in peripheral collisions are consistent with a PYTHIA-based model without nuclear modification, demonstrating that biases caused by the event selection and collision geometry can lead to the apparent suppression in peripheral collisions. This explains the unintuitive observation that RAA is below unity in peripheral Pb–Pb, but equal to unity in minimum-bias p–Pb collisions despite similar charged-particle multiplicities. Copyright © 2018, The Authors. All rights reserved.

关键词： Charged particles

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Charged-particle pseudorapidity density at mid-rapidity in p–Pb collisions at √sNN NN NN = 8.16 TeV

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adhya, S.P. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Ahammed, Z. Ahmad, S. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arratia, M. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbera, R. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Chakraborty, P. Chandra, S. Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Czech Republic Department of Physics Sejong University Seoul Czech Republic Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica e Astron

The pseudorapidity density of charged particles, dNch/dη, in p–Pb collisions has been measured at a centre-of-mass energy per nucleon-nucleon pair of √sNN = 8.16 TeV at mid-pseudorapidity for non-single-diffractive events. The results cover 3.6 units of pseudorapidity, |η| ch/dη value is 19.1 ±0.7 at |η| parti/2 is 4.73 ±0.20, where hNpartiis the average number of participating nucleons, is 9.5% higher than the corresponding value for p–Pb collisions at √sNN = 5.02 TeV. Measurements are compared with models based on different mechanisms for particle production. All models agree within uncertainties with data in the Pb-going side, while HIJING overestimates, showing a symmetric behaviour, and EPOS underestimates the p-going side of the dNch/dη distribution. Saturation-based models reproduce the distributions well for η > −1.3. The dNch/dη is also measured for different centrality estimators, based both on the charged-particle multiplicity and on the energy deposited in the Zero-Degree Calorimeters. A study of the implications of the large multiplicity fluctuations due to the small number of participants for systems like p–Pb in the centrality calculation for multiplicity-based estimators is discussed, demonstrating the advantages of determining the centrality with energy deposited near beam rapidity. Copyright © 2018, The Authors. All rights reserved.

关键词： Charged particles

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Medium modification of the shape of small-radius jets in central Pb–Pb collisions at √sNN = 2.76 TeV

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfaro Molina, R. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carena, W. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Chandra, S. Chang, B. Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

We present the measurement of a new set of jet shape observables for track-based jets in central Pb–Pb collisions at √sNN = 2.76 TeV. The set of jet shapes includes the first radial moment or angularity, g;the momentum dispersion, pTD;and the difference between the leading and sub-leading constituent track transverse momentum, LeSub. These observables provide complementary information on the jet fragmentation and can constrain different aspects of the theoretical description of jet-medium interactions. The jet shapes were measured for a small resolution parameter R = 0.2 and were fully corrected to particle level. The observed jet shape modifications indicate that in-medium fragmentation is harder and more collimated than vacuum fragmentation as obtained by PYTHIA calculations, which were validated with the measurements of the jet shapes in proton-proton collisions at √s = 7 TeV. The comparison of the measured distributions to templates for quark and gluon-initiated jets indicates that in-medium fragmentation resembles that of quark jets in vacuum. We further argue that the observed modifications are not consistent with a totally coherent energy loss picture where the jet loses energy as a single colour charge, suggesting that the medium resolves the jet structure at the angular scales probed by our measurements (R = 0.2). Furthermore, we observe that small-R jets can help to isolate purely energy loss effects from other effects that contribute to the modifications of the jet shower in medium such as the correlated background or medium response. Copyright © 2018, The Authors. All rights reserved.

关键词： Energy dissipation

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Azimuthal anisotropy of heavy-flavour decay electrons in p–Pb collisions at √sNN = 5.02 TeV

arXiv

引用

arXiv 2018年

Angular correlations between heavy-flavour decay electrons and charged particles at mid-rapidity (|η| 2) for heavy-flavour decay electrons in the transverse momentum interval 1.5 T 2 measurement of open heavy-flavour particles at mid-rapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems. Copyright © 2018, The Authors. All rights reserved.

关键词： Charged particles

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EUROPEAN ORGANIZATION FOR NUCLEAR research Measuring K0SK± interactions using pp collisions at √s = 7 TeV

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adler, A. Adolfsson, J. Aggarwal, M.M. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Alba, J.L. Bazo Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Martinez, H. Bello Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Villar, E. Calvo Camacho, R.S. Camerini, P. Capon, A.A. Carena, W. Carnesecchi, F. Castellanos, J. Castillo Castro, A.J. Casula, E.A.R. Sanchez, C. Ceballos Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

We present the first measurements of femtoscopic correlations between the K0S and K± particles in pp collisions at √s = 7 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely via the a0(980) resonance. The extracted kaon source radius and correlation strength parameters for K0SK− are found to be equal within the experimental uncertainties to those for K0SK+. Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at √s = 7 TeV by ALICE and with a K0SK± measurement in Pb-Pb collisions at √sNN = 2.76 TeV. Combined with the Pb-Pb results, our pp analysis is found to be compatible with the interpretation of the a0(980) having a tetraquark structure instead of that of a diquark. Copyright © 2018, The Authors. All rights reserved.

关键词： Hadrons

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Multiplicity dependence of light-flavor hadron production in pp collisions at √s = 7 TeV

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbano, A.M. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bazo Alba, J.L. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bello Martinez, H. Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carena, W. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Ceballos Sanchez, C. Deceased Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento d

Comprehensive results on the production of unidentified charged particles, π±, K±, K0S, K*(892)0, p, p, φ(1020), Λ, Λ, Ξ−, Ξ+, Ω− and Ω+hadrons in proton-proton (pp) collisions at √s = 7 TeV at midrapidity (|y| T ) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particle to pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb–Pb collisions at LHC energies. The obtained pT distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions. Copyright © 2018, The Authors. All rights reserved.

关键词： Hadrons

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EUROPEAN ORGANIZATION FOR NUCLEAR research Event-shape engineering for the D-meson elliptic flow in mid-central Pb–Pb collisions at √sNN NN NN = 5.02 TeV

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adler, A. Adolfsson, J. Aggarwal, M.M. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arratia, M. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbera, R. Barile, F. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Alba, J.L. Bazo Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Martinez, H. Bello Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bhom, J. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caffarri, D. Caines, H. Caliva, A. Villar, E. Calvo Camacho, R.S. Camerini, P. Capon, A.A. Carena, W. Carnesecchi, F. Castellanos, J. Castillo Castro, A.J. Casula, E.A.R. Sanchez, C. Ceballos Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

The production yield of prompt D mesons and their elliptic flow coefficient v2 were measured with the Event-Shape Engineering (ESE) technique applied to mid-central (10–30% and 30–50% centrality classes) Pb–Pb collisions at the centre-of-mass energy per nucleon pair √sNN = 5.02 TeV, with the ALICE detector at the LHC. The ESE technique allows the classification of events, belonging to the same centrality, according to the azimuthal anisotropy of soft particle production in the collision. The reported measurements give the opportunity to investigate the dynamics of charm quarks in the Quark–Gluon Plasma and provide information on their participation in the collective expansion of the medium. D mesons were reconstructed via their hadronic decays at mid-rapidity, |η| T 2 coefficient is found to be sensitive to the event-shape selection confirming a correlation between the D-meson azimuthal anisotropy and the collective expansion of the bulk matter, while the per-event D-meson yields do not show any significant modification within the current uncertainties. Copyright © 2018, The Authors. All rights reserved.

关键词： Expansion

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Real-time data processing in the ALICE High Level Trigger at the LHC

arXiv

引用

arXiv 2018年

作者： Acharya, S. Acosta, F.T. Adamová, D. Adhya, S.P. Adler, A. Adolfsson, J. Aggarwal, M.M. Rinella, G. Aglieri Agnello, M. Ahammed, Z. Ahmad, S. Ahn, S.U. Aiola, S. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arratia, M. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Bach, M. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Baral, R.C. Barbera, R. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Becker, B. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Martinez, H. Bello Bellwied, R. Beltran, L.G.E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Betev, L. Bhasin, A. Bhat, I.R. Bhatt, H. Bhattacharjee, B. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Boetteger, S. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Bonora, M. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Bratrud, L. Braun-Munzinger, P. Bregant, M. Breitener, T.G. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Caffarri, D. Caines, H. Caliva, A. Villar, E. Calvo Camacho, R.S. Camerini, P. Capon, A.A. Carnesecchi, F. Castellanos, J. Castillo Castro, A.J. Casula, E.A.R. Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica

At the Large Hadron Collider at CERN in Geneva, Switzerland, atomic nuclei are collided at ultra-relativistic energies. Many final-state particles are produced in each collision and their properties are measured by the ALICE detector. The detector signals induced by the produced particles are digitized leading to data rates that are in excess of 48 GB/s. The ALICE High Level Trigger (HLT) system pioneered the use of FPGA- and GPU-based algorithms to reconstruct charged-particle trajectories and reduce the data size in real time. The results of the reconstruction of the collision events, available online, are used for high level data quality and detector-performance monitoring and real-time time-dependent detector calibration. The online data compression techniques developed and used in the ALICE HLT have more than quadrupled the amount of data that can be stored for offline event processing. Copyright © 2018, The Authors. All rights reserved.

关键词： Charged particles

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