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arXiv 2023年

作者： Acharya, S. Adamová, D. Adler, A. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A.R. Altsybeev, I. Anaam, M.N. Andrei, C. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Aresti, M. Arnaldi, R. Arneiro, J.G.M.C.A. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Baba, H. Badalà, A. Bae, J. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Balbino, A. Baldisseri, A. Balis, B. Banerjee, D. Banoo, Z. Barbera, R. Barile, F. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Becht, P. Behera, D. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, M.A. Bhattacharjee, B. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bigot, A.P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J.T. Blau, D. Blidaru, M.B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Borquez Carcamo, A.G. Bossi, H. Botta, E. Bouziani, Y.E.M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S.A. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camerini, P. Canedo, F.D.M. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Castillo Castellanos, J. Catalano, F. Foundation Yerevan Armenia AGH University of Science and Technology Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mexico City Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad 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 Università di Pavia Pavia Italy Dipartimento di Fisica dell’Università Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università 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 Astronomia dell’Università Sezione INFN Padova Italy Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università Gruppo Collegato INFN Salerno Italy Dipartimento DISAT del Politecnico Sezione INFN Turin Italy Dipartimento di Scienze MIFT Università di Messina Messina Italy Dipartimento Interateneo di Fisica ‘M. Merlin’ Sezione INFN Bari Italy Geneva Switzerland Faculty of Electrical Engineering

The transverse momentum (pT) and centrality dependence of the nuclear modification factor RAA of prompt and non-prompt J/ψ, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb–Pb collisions at √sNN = 5.02 TeV. The measurements are carried out through the e+e− decay channel at midrapidity (|y| T T > 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping pT intervals, and cover the kinematic region down to pT = 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/ψ in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/ψ production from recombination of c and c quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J/ψ. For non-prompt J/ψ, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark–gluon plasma is consistent with measurements within uncertainties. © 2023, CC BY.

关键词： Uncertainty analysis

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

arXiv

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arXiv 2023年

作者： Acharya, S. Adamová, D. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A.R. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, N. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Aresti, M. Arnaldi, R. Arneiro, J.G.M.C.A. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Baba, H. Badalà, A. Bae, J. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Balbino, A. Baldisseri, A. Balis, B. Banerjee, D. Banoo, Z. Barbera, R. Barile, F. Barioglio, L. Barlou, M. Barman, B. Barnaföldi, G.G. Barnby, L.S. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Beattie, C. Becht, P. Behera, D. Belikov, I. Hechavarria, A.D.C. Bell Bellini, F. Bellwied, R. Belokurova, S. Beltran, Y.A.V. Bencedi, G. Beole, S. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, M.A. Bhattacharjee, B. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bigot, A.P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J.T. Blau, D. Blidaru, M.B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Carcamo, A.G. Borquez Bossi, H. Botta, E. Bouziani, Y.E.M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S.A. Cai, M. Caines, H. Caliva, A. Villar, E. Calvo Camacho, J.M.M. Camerini, P. Canedo, F.D.M. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Max-Planck-Institut für Physik Munich Germany Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland CERN Switzerland Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mexico City Mérida Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad 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 Università di Pavia Pavia Italy Dipartimento di Fisica dell’Università Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università 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 Astronomia dell’Università Sezione INFN Padova Italy Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università Gruppo Collegato INFN Salern

Correlations in azimuthal angle extending over a long range in pseudorapidity between particles, usually called the "ridge" phenomenon, were discovered in heavy-ion collisions, and later found in pp and p–Pb collisions. In large systems, they are thought to arise from the expansion (collective flow) of the produced particles. Extending these measurements over a wider range in pseudorapidity and final-state particle multiplicity is important to understand better the origin of these long-range correlations in small collision systems. In this Letter, measurements of the long-range correlations in p–Pb collisions at √sNN = 5.02 TeV are extended to a pseudorapidity gap of ∆η∼8 between particles using the ALICE forward multiplicity detectors. After suppressing non-flow correlations, e.g., from jet and resonance decays, the ridge structure is observed to persist up to a very large gap of ∆η∼8 for the first time in p–Pb collisions. This shows that the collective flow-like correlations extend over an extensive pseudorapidity range also in small collision systems such as p–Pb collisions. The pseudorapidity dependence of the second-order anisotropic flow coefficient, v2(η), is extracted from the long-range correlations. The v2(η) results are presented for a wide pseudorapidity range of −3.1 2(η) measurements are compared with hydrodynamic and transport model calculations. The comparison suggests that the final-state interactions play a dominant role in developing the anisotropic flow in small collision systems. © 2023, CC BY.

关键词： Anisotropy

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Charged-particle production as a function of the relative transverse activity classifier in pp, p–Pb, and Pb–Pb collisions at the LHC

arXiv

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arXiv 2023年

作者： Acharya, S. Adamová, D. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A.R. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, N. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Aresti, M. Arnaldi, R. Arneiro, J.G.M.C.A. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Baba, H. Badala, A. Bae, J. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Banerjee, D. Banoo, Z. Barbera, R. Barile, F. Barioglio, L. Barlou, M. Barman, B. Barnaföldi, G.G. Barnby, L.S. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Beattie, C. Becht, P. Behera, D. Belikov, I. Hechavarria, A.D.C. Bell Bellini, F. Bellwied, R. Belokurova, S. Beltran, Y.A.V. Bencedi, G. Beole, S. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, M.A. Bhattacharjee, B. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bigot, A.P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J.T. Blau, D. Blidaru, M.B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Carcamo, A.G. Borquez Bossi, H. Botta, E. Bouziani, Y.E.M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S.A. Cai, M. Caines, H. Caliva, A. Villar, E. Calvo Camacho, J.M.M. Camerini, P. Canedo, F.D.M. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Max-Planck-Institut für Physik Munich Germany Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland CERN Switzerland Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mérida Mexico Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad 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 Università di Pavia Pavia Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università and Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Catania Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Padova Italy Dipartimento di Fisica E.R. Caianiello’ dell’Università Gruppo Collegato

Measurements of charged-particle production in pp, p–Pb, and Pb–Pb collisions in the toward, away, and transverse regions with the ALICE detector are discussed. These regions are defined event-by-event relative to the azimuthal direction of the charged trigger particle, which is the reconstructed particle with the largest transverse momentum (ptrigT ) in the range 8 trigT T = NchT /〈NchT 〉, is used to group events according to their UE activity, where NchT is the charged-particle multiplicity per event in the transverse region and 〈NchT 〉 is the mean value over the whole analysed sample. The energy dependence of the RT distributions in pp collisions at √s = 2.76, 5.02, 7, and 13 TeV is reported, exploring the Koba-Nielsen-Olesen (KNO) scaling properties of the multiplicity distributions. The first measurements of charged-particle pT spectra as a function of RT in the three azimuthal regions in pp, p–Pb, and Pb–Pb collisions at √sNN = 5.02 TeV are also reported. Data are compared with predictions obtained from the event generators PYTHIA 8 and EPOS LHC. This set of measurements is expected to contribute to the understanding of the origin of collective-like effects in small collision systems (pp and p–Pb). © 2023, CC BY.

关键词： Charged particles

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Symmetry plane correlations in Pb-Pb collisions at √sNN = 2.76 TeV

arXiv

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arXiv 2023年

作者： Acharya, S. Adamová, D. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A.R. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, N. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Aresti, M. Arnaldi, R. Arneiro, J.G.M.C.A. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Azmi, M.D. Baba, H. Badalà, A. Bae, J. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Balbino, A. Baldisseri, A. Balis, B. Banerjee, D. Banoo, Z. Barbera, R. Barile, F. Barioglio, L. Barlou, M. Barman, B. Barnaföldi, G.G. Barnby, L.S. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Becht, P. Behera, D. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Beltran, Y.A.V. Bencedi, G. Beole, S. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, M.A. Bhattacharjee, B. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bigot, A.P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J.T. Blau, D. Blidaru, M.B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Borquez Carcamo, A.G. Bossi, H. Botta, E. Bouziani, Y.E.M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S.A. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camerini, P. Canedo, F.D.M. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Max-Planck-Institut für Physik Munich Germany Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy Department of Applied Physics Aligarh Muslim University Aligarh India Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mexico City Merida Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju Korea Republic of Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad 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 Università di Pavia Pavia Italy Dipartimento di Fisica dell'Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell'Università and Sezione INFN Trieste Italy Dipartimento di Fisica dell'Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia Università and Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia Università and Sezione INFN Catania Italy Dipartimento di Fisica e Astronomia Università and Sezione INFN Padova Italy Dipartimento di Fisica E.R. Caianiello' dell'Università Gruppo Collegato INFN Salerno Italy Dipa

A newly developed observable for correlations between symmetry planes, which characterize the direction of the anisotropic emission of produced particles, is measured in Pb-Pb collisions at √sNN = 2.76 TeV with ALICE. This so-called Gaussian Estimator allows for the first time the study of these quantities without the influence of correlations between different flow amplitudes. The centrality dependence of various correlations between two, three and four symmetry planes is presented. The ordering of magnitude between these symmetry plane correlations is discussed and the results of the Gaussian Estimator are compared with measurements of previously used estimators. The results utilizing the new estimator lead to significantly smaller correlations than reported by studies using the Scalar Product method. Furthermore, the obtained symmetry plane correlations are compared to state-of-the-art hydrodynamic model calculations for the evolution of heavy-ion collisions. While the model predictions provide a qualitative description of the data, quantitative agreement is not always observed, particularly for correlators with significant non-linear response of the medium to initial state anisotropies of the collision system. As these results provide unique and independent information, their usage in future Bayesian analysis can further constrain our knowledge on the properties of the QCD matter produced in ultrarelativistic heavy-ion collisions. © 2023, CC BY.

关键词： Binary alloys

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K∗(892)± resonance production in Pb−Pb collisions at √sNN = 5.02 TeV

arXiv

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arXiv 2023年

The production of K∗(892)± meson resonance is measured at midrapidity (|y| NN = 5.02 TeV using the ALICE detector at the Large Hadron Collider. The resonance is reconstructed via its hadronic decay channel K∗(892)± → K0Sπ±. The transverse momentum distributions are obtained for various centrality intervals in the pT range of 0.4−16 GeV/c. Measurements of integrated yields, mean transverse momenta, and particle yield ratios are reported and found to be consistent with previous ALICE measurements for K∗(892)0 within uncertainties. The pT-integrated yield ratio 2K∗(892)±/(K+ + K−) in central Pb−Pb collisions shows a significant suppression at a level of 9.3σ relative to pp collisions. Thermal model calculations result in an over-prediction of the particle yield ratio. Although both HRG-PCE and MUSIC+SMASH simulations consider the hadronic phase, only HRG-PCE accurately represents the measurements, whereas MUSIC+SMASH simulations tend to overpredict the particle yield ratio. These observations, along with the kinetic freeze-out temperatures extracted from the yields measured for light-flavored hadrons using the HRG-PCE model, indicate a finite hadronic phase lifetime, which decreases with increasing collision centrality percentile. The pT-differential yield ratios 2K∗(892)±/(K+ + K−) and 2K∗(892)±/(π+ + π−) are presented and compared with measurements in pp collisions at √s = 5.02 TeV. Both particle ratios are found to be suppressed by up to a factor of five at pT AA) shows a smooth evolution with centrality and is found to be below unity at pT > 8 GeV/c, consistent with measurements for other light-flavored hadrons. The smallest values are observed in most central collisions, indicating larger energy loss of partons traversing the dense medium. © 2023, CC BY.

关键词： Hadrons

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An Assessment of Energy Performance Index of the Nigerian Universities' Senate Building

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IOP Conference Series: Earth and Environmental Science 2019年第1期331卷

作者： Yahuza Abdulhamid Aisha Suleiman Sani Mudashir Gafar A.M. Usman Faculty of Engineering and Environmental Design Department of Architecture Kano State Polytechnic Kano Faculty of Environmental Design Usmanu Danfodiyo University Sokoto Ahmadu Bello University Zaria Nigeria

Apparently, Nigeria is struggling with the developmental issues of the incessant power outage and lack of energy services. The primary sources of energy for office building are from national grid and gasoline generators. However, the former is not reliable and the latter is unsustainable; hence, the need to explore energy efficiency strategies to cut down the energy demand for cooling office building in Nigeria is unavoidable. The article aimed to assess the energy efficiency or performance index of the Nigerian Universities' senate buildings in the north-eastern region (dry sub-humid climate). The research employed a case study approach, construction of baseline model with the Revit architecture software and applied DesignBuilder building analysis software to evaluate the energy performance of the senate building as built. The research findings showed that energy efficiency indexes for both universities' senate buildings (57% and 63%) which were relatively below the recommended standard checklist. Also, the simulation results further showed that both case studies require 141.4wh/m2 and 127.3wh/m2 heating/cooling per annum compared to the stipulated LEED (Leadership in Energy and Environmental Design) standard of 15wh/m2. Therefore, research implication is that it is essential for the architects and engineers to incorporate more proactive energy efficiency strategies in the design of office buildings in Nigeria

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Modeling occupancy distribution in large building spaces for HVAC energy efficiency

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Energy Procedia 2018年 152卷 1230-1235页

作者： Wei Wang Xiaodong Xu His-Hsien Wei Bin Ren Jiayu Chen Department of Architecture and Civil Engineering City University of Hong Kong Y6621 AC1 Tat Chee Ave Kowloon Hong Kong School of Architecture Southeast University 2 Sipailou Nanjing Jiangsu Province，China Department of Building and Real Estate The Hong Kong Polytechnic University ZN743 Hung Hom Hong Kong School of Mechatronic Engineering and Automation Shanghai University Mechatronic Building 301 Yanchang Road 149 Shanghai China

In large spaces, co-operative HVAC terminals are usually installed to provide services for different virtual thermal zones. The lack of high-resolution occupancy distribution in large spaces is often perceived as one of the main causes of underperformed HAVC systems. Current studies usually considered occupancy information of the whole space or room, such as occupancy count level, other than the zone-level occupancy distribution. Although the count of total occupants in space might stay constant, the actual occupancy distribution might be different, which will bring with different operations for each HVAC terminal. Therefore, to find out one high-resolution occupancy level, this research proposed the idea of integrating k-Means clustering and k Nearest Neighbors (kNN) classification algorithm to detect the occupancy distribution via the dual Bluetooth Low Energy (BLE) and Wi-Fi signal technology networks. One experiment place was conducted in one indoor area of the typical office room at the City University of Hong Kong for measuring the signal distribution of BLE and Wi-Fi. In this study, the occupancy preference cluster could be mapped into the indoor thermal zones and three case studies are chosen for validation of occupant number confirmation in each thermal zone. Finally, zone occupancy based energy performance analysis was presented with the assistance of wireless sensors nodes to compare energy saving potential under actual occupancy distribution and detected occupancy distribution and the importance of zone occupancy information for the demand-driven control mechanism is stressed.

关键词： cluster-classification algorithm occupancy distribution HVAC energy efficiency

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A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics

arXiv

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arXiv 2022年

作者： Aalbers, J. Abe, K. Aerne, V. Agostini, F. Ahmed Maouloud, S. Akerib, D.S. Akimov, D.Yu. Akshat, J. Al Musalhi, A.K. Alder, F. Alsum, S.K. Althueser, L. Amarasinghe, C.S. Amaro, F.D. Ames, A. Anderson, T.J. Andrieu, B. Angelides, N. Angelino, E. Angevaare, J. Antochi, V.C. Antón Martin, D. Antunovic, B. Aprile, E. Araújo, H.M. Armstrong, J.E. Arneodo, F. Arthurs, M. Asadi, P. Baek, S. Bai, X. Bajpai, D. Baker, A. Balajthy, J. Balashov, S. Balzer, M. Bandyopadhyay, A. Bang, J. Barberio, E. Bargemann, J.W. Baudis, L. Bauer, D. Baur, D. Baxter, A. Baxter, A.L. Bazyk, M. Beattie, K. Behrens, J. Bell, N.F. Bellagamba, L. Beltrame, P. Benabderrahmane, M. Bernard, E.P. Bertone, G.F. Bhattacharjee, P. Bhatti, A. Biekert, A. Biesiadzinski, T.P. Binau, A.R. Biondi, R. Biondi, Y. Birch, H.J. Bishara, F. Bismark, A. Blanco, C. Blockinger, G.M. Bodnia, E. Boehm, C. Bolozdynya, A.I. Bolton, P.D. Bottaro, S. Bourgeois, C. Boxer, B. Brás, P. Breskin, A. Breur, P.A. Brew, C.A.J. Brod, J. Brookes, E. Brown, A. Brown, E. Bruenner, S. Bruno, G. Budnik, R. Bui, T.K. Burdin, S. Buse, S. Busenitz, J.K. Buttazzo, D. Buuck, M. Buzulutskov, A. Cabrita, R. Cai, C. Cai, D. Capelli, C. Cardoso, J.M.R. Carmona-Benitez, M.C. Cascella, M. Catena, R. Chakraborty, S. Chan, C. Chang, S. Chauvin, A. Chawla, A. Chen, H. Chepel, V. Chott, N.I. Cichon, D. Cimental Chavez, A. Cimmino, B. Clark, M. Co, R.T. Colijn, A.P. Conrad, J. Converse, M.V. Costa, M. Cottle, A. Cox, G. Creaner, O. Cuenca Garcia, J.J. Cussonneau, J.P. Cutter, J.E. Dahl, C.E. D'Andrea, V. David, A. Decowski, M.P. Dent, J.B. Deppisch, F.F. de Viveiros, L. Di Gangi, P. Di Giovanni, A. Di Pede, S. Dierle, J. Diglio, S. Dobson, J.E.Y. Doerenkamp, M. Douillet, D. Drexlin, G. Druszkiewicz, E. Dunsky, D. Eitel, K. Elykov, A. Emken, T. Engel, R. Eriksen, S.R. Fairbairn, M. Fan, A. Fan, J.J. Farrell, S.J. Fayer, S. Fearon, N.M. Ferella, A. Ferrari, C. Fieguth, A. Fieguth, A. Fiorucci, S. SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Kavli Institute for Particle Astrophysics and Cosmology Stanford University StanfordCA94305 United States Kamioka Observatory Institute for Cosmic Ray Research The University of Tokyo Higashi-Mozumi Kamioka Hida Gifu506-1205 Japan The University of Tokyo Kashiwa Chiba277-8582 Japan Physik-Institut University of Zurich Zurich8057 Switzerland Department of Physics and Astronomy University of Bologna INFN-Bologna Bologna40126 Italy LPNHE Sorbonne Université CNRS IN2P3 Paris75005 France Moscow115409 Russia Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Department of Physics University of Oxford Keble Rd OxfordOX1 3RH United Kingdom Department of Physics and Astronomy University College London LondonWC1E 6BT United Kingdom Department of Physics University of Wisconsin-Madison MadisonWI53706 United States Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster48149 Germany University of Michigan Randall Laboratory of Physics Ann ArborMI48109 United States LIBPhys Department of Physics University of Coimbra Coimbra3004-516 Portugal Department of Physics Blackett Laboratory Imperial College London LondonSW7 2BW United Kingdom INAF-Astrophysical Observatory of Torino Department of Physics University of Torino INFN-Torino Torino10125 Italy Nikhef The University of Amsterdam Science Park Amsterdam1098XG Netherlands Oskar Klein Centre Department of Physics Stockholm University AlbaNova StockholmSE-10691 Sweden Department of Physics Kavli Institute for Cosmological Physics The University of Chicago ChicagoIL60637 United States Vinca Institute of Nuclear Science University of Belgrade Mihajla Petrovica Alasa 12-14 Belgrade Serbia Faculty of Architecture Civil Engineering and Geodesy University of Banja Luka Bulevar vojvode Petra Bojovica 1a Banja Luka78000 Bosnia and Herzegovina Physics D

The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector. © 2022, CC BY.

关键词： Dark Matter

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Integration of lean construction and building information modeling in a large client organization in Massachusetts 25

Integration of lean construction and building information mo...

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25th Annual Conference of the International Group for Lean Construction, IGLC 2017

作者： Bolpagni, Marzia Burdi, Luciana Ciribini, Angelo Luigi Camillo Department of Architecture Built Environment and Construction Engineering Politecnico di Milano Milano Italy Department of Civil and Environmental Engineering Worcester Polytechnic Institute WorcesterMA United States Department of Civil Environmental Architectural Engineering and Mathematics University of Brescia Brescia Italy

Recently the construction industry has started to study and implement together Lean Construction (Lean) and Building Information Modeling (BIM) to better manage projects. Previous research findings suggest that several changes in the work practice and business processes are needed to fully take advantage of BIM and Lean. Even if the client's role is very important to drive the entire process, the literature lacks of comprehensive examples of client's implementation. The paper shows how a large client organization is integrating Lean and BIM in real projects and how it is possible to measure it thanks to a Maturity Matrix. The research is based on a case study involving both active participation and interviews. The main results indicate that a) internal change is needed in the client organization;b) clients need to drive the process in order to maximise benefits;c) BIM does not fit in the traditional procurement process;and d) existing contracts need to be modified to support BIM and Lean. Research findings are useful for large client organizations that would like to integrate BIM and Lean in their operational strategy as well as for researchers. Further studies could be done to compare the work of different client organizations.

关键词： Construction industry

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The implementation of building information modelling and lean construction in design firms in Massachusetts 25

The implementation of building information modelling and lea...

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25th Annual Conference of the International Group for Lean Construction, IGLC 2017

It is not easy to evaluate Building Information Modelling (BIM) and Lean Construction (Lean) capabilities of design firms. The paper investigates the level of BIM and Lean implementation at representative design firms in Massachusetts. A survey was given to the principal design firms working for a large public client. First, answers were analysed and discussed. Second, results from the same design firm were compared to detect possible inconsistencies. Main results show that there is still not a clear definition of BIM and Lean;BIM training is not done consistently within design firms;and there is not a common understanding of BIM and Lean within each design firm, even though most designers affirmed that they have internal standards. Results of the survey could be useful for designers to develop internal standards and establish training courses for the design firm and clients to better understand designers' approach to BIM and Lean.

关键词： Surveys

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