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arXiv 2021年

作者： Acharya, S. Adamová, D. Adler, A. Adolfsson, J. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Akbar, Z. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andronic, A. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Ball, M. Banerjee, D. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Beattie, C. Belikov, I. Hechavarria, A.D.C. Bell Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Berenyi, D. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhattacharjee, B. Bhattacharya, P. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bilandzic, A. Biro, G. Biswas, S. Blair, J.T. Blau, D. Blidaru, M.B. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buthelezi, Z. Butt, J.B. Bysiak, S.A. Caffarri, D. Cai, M. Caliva, A. Villar, E. Calvo Camacho, J.M.M. Camacho, R.S. Camerini, P. Canedo, F.D.M. Capon, A.A. Carnesecchi, F. Caron, R. Castellanos, J. Castillo Casula, E.A.R. Catalano, F. Sanchez, C. Ceballos Chakraborty, P. Chandra, S. Chang, W. Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland 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 Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mexico City and Mérida Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing 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 dell'Università'La Sapienza' Sezione INFN Rome 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 Nucleare e Teorica Università di Pavia Sezione

Correlations between moments of different flow coefficients are measured in Pb-Pb collisions at √sNN = 5.02 TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants calculated using charged particles in the pseudorapidity region |η| T 2 and v3 is measured for the first time, where the characteristic signature of negative, positive and negative signs of four-, six- and eight-particle cumulants are observed, respectively. The measurements are compared to the hydrodynamic calculations using iEBE-VISHNU with AMPT and TRENTo initial conditions. It is shown that the measurements carried out using the LHC Run 2 data in 2015 have the precision to explore the details of initial-state fluctuations and probe the nonlinear hydrodynamic response of v2 and v3 to their corresponding initial anisotropy coefficients Ε2 and Ε3. These new studies on correlations between three flow coefficients as well as correlations between higher moments of two different flow coefficients will pave the way to tighten constraints on initial-state models and help to extract precise information on the dynamic evolution of the hot and dense matter created in heavy-ion collisions at the LHC. © 2021, CC BY.

关键词： Colliding beam accelerators

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Investigating the role of strangeness in baryon-antibaryon annihilation at the LHC

arXiv

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arXiv 2021年

作者： Acharya, S. Adamová, D. Adler, A. Adolfsson, J. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akbar, Z. Akindinov, A. Al-Turany, M. Alam, S.N. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andronic, A. Angeletti, M. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Ball, M. Banerjee, D. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Berenyi, D. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhattacharjee, B. Bhattacharya, P. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bilandzic, A. Biro, G. Biswas, S. Blair, J.T. Blau, D. Blidaru, M.B. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buthelezi, Z. Butt, J.B. Bysiak, S.A. Caffarri, D. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camacho, R.S. Camerini, P. Canedo, F.D.M. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Casula, E.A.R. Catalano, F. Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland 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 Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mérida Mexico City Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing 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'La Sapienza' Sezione INFN Rome Italy Dipartimento di Fisica Università and Sezione INFN Cagliari Italy Dipartimento di Fisica Università and Sezione INFN Trieste Italy Dipartimento di Fisica 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 Nucleare e Teorica Università di Pavia Pavia Italy Diparti

Annihilation dynamics plays a fundamental role in the baryon-antibaryon interaction (B-B) at low-energy and its strength and range are crucial in the assessment of possible baryonic bound states. Experimental data on annihilation cross sections are available for the p-p system but not in the low relative momentum region. Data regarding the B-B interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon-antinucleon (N-N) results, when available. In this letter we present a measurement of the p-p, p-Λ ⊕ p-Λ and Λ-Λ interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at √s = 13 TeV recorded by ALICE at the LHC. In the p-p system the couplings to the mesonic channels in different partial waves are extracted by adopting a coupled-channel approach with recent χEFT potentials. The inclusion of these inelastic channels provides good agreement with the data, showing a significant presence of the annihilation term down to zero momentum. Predictions obtained using the Lednický-Lyuboshits formula and scattering parameters obtained from heavy-ion collisions, hence mainly sensitive to elastic processes, are compared with the experimental p-Λ ⊕ p-Λ and Λ-Λ correlations. The model describes the Λ-Λ data and underestimates the p-Λ ⊕ p-Λ data in the region of momenta below 200 MeV/c. The observed deviation indicates a different contribution of annihilation channels to the two systems containing strange hadrons. © 2021, CC BY.

关键词： Momentum

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Production of Λ and K0S in jets in p-Pb collisions at √sNN = 5.02 TeV and pp collisions at √s = 7 TeV

arXiv

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arXiv 2021年

作者： Acharya, S. Adamová, D. Adler, A. Adolfsson, J. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Akbar, Z. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andronic, A. Angeletti, M. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Ball, M. Banerjee, D. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Berenyi, D. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhattacharjee, B. Bhattacharya, P. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bilandzic, A. Biro, G. Biswas, S. Blair, J.T. Blau, D. Blidaru, M.B. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Busch, O. Buthelezi, Z. Butt, J.B. Bysiak, S.A. Caffarri, D. Cai, M. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camacho, R.S. Camerini, P. Canedo, F.D.M. Capon, A.A. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Casula, E.A.R. Catalano, F. Ceballos Sanchez, C. Chakraborty, P. Chandra, S. Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland 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 Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mérida Mexico City Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing 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'La Sapienza' Sezione INFN Rome Italy Dipartimento di Fisica Università and Sezione INFN Cagliari Italy Dipartimento di Fisica Università and Sezione INFN Trieste Italy Dipartimento di Fisica 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 Nucleare e Teorica Università di Pavia Sezione INFN Pavia Ital

The production of Λ baryons and K0S mesons (V0 particles) was measured in p-Pb collisions at √sNN = 5.02 TeV and pp collisions at √s = 7 TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (pT) in high multiplicity pp and p-Pb collisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-kT algorithm using charged particles. The production of strange particles associated with jets (Equation prsented) and (Equation prsented) in p-Pb collisions, and with jet(Equation prsented) GeV/c in pp collisions is reported as a function of pT. Its dependence on angular distance from the jet axis, R(V0, jet), for jets with (Equation prsented) in p-Pb collisions is reported as well. The pT-differential production spectra of strange particles associated with jets are found to be harder compared to that in the underlying event and both differ from the inclusive measurements. In events containing a jet, the density of the V0 particles in the underlying event is found to be larger than the density in the minimum bias events. The Λ/K0S ratio associated with jets in p-Pb collisions is consistent with the ratio in pp collisions and follows the expectation of jets fragmenting in vacuum. On the other hand, this ratio within jets is consistently lower than the one obtained in the underlying event and it does not show the characteristic enhancement of baryons at intermediate pT often referred to as "baryon anomaly" in the inclusive measurements. © 2021, CC BY.

关键词： Bosons

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Energy dependence of φ meson production at forward rapidity in pp collisions at the LHC

arXiv

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arXiv 2021年

作者： Acharya, S. Adamová, D. Adler, A. Adolfsson, J. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akbar, Z. Akindinov, A. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andronic, A. Angeletti, M. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Ball, M. Banerjee, D. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Beattie, C. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Berenyi, D. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhattacharjee, B. Bhattacharya, P. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bilandzic, A. Biro, G. Biswas, S. Blair, J.T. Blau, D. Blidaru, M.B. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buthelezi, Z. Butt, J.B. Bysiak, S.A. Caffarri, D. Cai, M. Caines, H. Caliva, A. Villar, E. Calvo Camacho, J.M.M. Camacho, R.S. Camerini, P. Canedo, F.D.M. Capon, A.A. Carnesecchi, F. Caron, R. Castellanos, J. Castillo Casula, E.A.R. Catalano, F. Sanchez, C. Ceballos Chakraborty, P. Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland 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 Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mérida Mexico City Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing 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'La Sapienza' Sezione INFN Rome Italy Dipartimento di Fisica Università and Sezione INFN Cagliari Italy Dipartimento di Fisica Università and Sezione INFN Trieste Italy Dipartimento di Fisica 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 Nucleare e Teorica Università di Pavia Pavia Italy Diparti

The production of φ mesons has been studied in pp collisions at LHC energies with the ALICE detector via the dimuon decay channel in the rapidity region 2.5 2σ/dydpT are presented as a function of the transverse momentum (pT) at the center-of-mass energies √s = 5.02, 8 and 13 TeV and compared with the ALICE results at midrapidity. The differential cross sections at √s = 5.02 and 13 TeV are also studied in several rapidity intervals as a function of pT, and as a function of rapidity in three pT intervals. A hardening of the pT-differential cross section with the collision energy is observed, while, for a given energy, pT spectra soften with increasing rapidity and, conversely, rapidity distributions get slightly narrower at increasing pT. The new results, complementing the published measurements at √s = 2.76 and 7 TeV, allow one to establish the energy dependence of φ meson production and to compare the measured cross sections with phenomenological models. None of the considered models manages to describe the evolution of the cross section with pT and rapidity at all the energies. © 2021, CC BY.

关键词： Bosons

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Inclusive, prompt and non-prompt J/ψ production at midrapidity in p−Pb collisions at √sNN = 5.02 TeV

arXiv

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arXiv 2021年

A measurement of inclusive, prompt, and non-prompt J/ψ production in p−Pb collisions at a nucleon-nucleon centre-of-mass energy √sNN = 5.02 TeV is presented. The inclusive J/ψ mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum pT = 0. The inclusive J/ψ nuclear modification factor RpPb is calculated by comparing the new results in p−Pb collisions to a recently measured proton−proton reference at the same centre-of-mass energy. Non-prompt J/ψ mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/ψ on a statistical basis for pT larger than 1.0 GeV/c. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p−Pb run, corresponding to an integrated luminosity Lint = 292±11 µb−1, which is six times larger than the previous publications. The total uncertainty on the pT-integrated inclusive J/ψ and non-prompt J/ψ cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and RpPb are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/ψ production cross section, the bb production cross section at midrapidity, dσb(Equation presented)/dy, and the total cross section extrapolated over full phase space, σb(Equation presented), are derived. © 2021, CC BY.

关键词： Hadrons

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Measurement of the cross sections of (Equation presented) and (Equation presented) baryons and of the branching-fraction ratio (Equation presented) in pp collisions at √s = 13 TeV

arXiv

引用

arXiv 2021年

作者： Acharya, S. Adamová, D. Adler, A. Adolfsson, J. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akbar, Z. Akindinov, A. Al-Turany, M. Alam, S.N. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Ali, Y. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andronic, A. Angeletti, M. Anguelov, V. Antinori, F. Antonioli, P. Anuj, C. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Ball, M. Banerjee, D. Barbera, R. Barioglio, L. Barlou, M. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartels, C. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, S. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berdnikova, A. Berenyi, D. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhattacharjee, B. Bhattacharya, P. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Biernat, J. Bilandzic, A. Biro, G. Biswas, S. Blair, J.T. Blau, D. Blidaru, M.B. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boi, S. Bok, J. Boldizsár, L. Bolozdynya, A. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buthelezi, Z. Butt, J.B. Bysiak, S.A. Caffarri, D. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camacho, R.S. Camerini, P. Canedo, F.D.M. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Casula, E.A.R. Catalano, F. Bologna Italy Dipartimento DET del Politecnico di Torino Turin Italy M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland 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 Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Havana Cuba Mérida Mexico City Mexico Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing 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 La Sapienza Sezione INFN Rome Italy Dipartimento di Fisica Università and Sezione INFN Cagliari Italy Dipartimento di Fisica Università and Sezione INFN Trieste Italy Dipartimento di Fisica 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 Nucleare e Teorica Università di Pavia Pavia Italy Dipartim

The pT-differential cross sections of prompt charm-strange baryons (Equation presented) and (Equation presented) were measured at midrapidity (|y| −e+νe) and the hadronic decay (Ξ−π+) channels. The (Equation presented) baryon was reconstructed via the hadronic decay (Ξ−π+π+) channel. The branching-fraction ratio (Equation presented) was measured with a total uncertainty reduced by a factor of about 3 with respect to the current world average reported by the Particle Data Group. The transverse momentum (pT) dependence of the (Equation presented) - and (Equation presented) -baryon production relative to the D0-meson and to the (Equation presented)- and (Equation presented) -baryon production are reported. The baryon-to-meson ratio increases towards low pT up to a value of approximately 0.3. The measurements are compared with various models that take different hadronisation mechanisms into consideration. The results provide stringent constraints to these theoretical calculations and additional evidence that different processes are involved in charm hadronisation in electron-positron (e+e−) and hadronic collisions. © 2021, CC BY.

关键词： Hadrons

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The deterministic and stochastic shallow lake problem

arXiv

引用

arXiv 2017年

作者： Kossioris, G.T. Loulakis, M. Souganidis, And P.E. DEPARTMENT OF MATHEMATICS AND APPLIED MATHEMATICS VOUTES CAMPUS UNIVERSITY OF CRETE HERAKLION70013 Greece SCHOOL OF APPLIED MATHEMATICAL AND PHYSICAL SCIENCES NATIONAL TECHNICAL UNIVERSITY OF ATHENS ATHENS15780 Greece INSTITUTE OF APPLIED AND COMPUTATIONAL MATHEMATICS- FOUNDATION OF RESEARCH AND TECHNOLOGY HELLAS HERAKLION700 13 Greece DEPARTMENT OF MATHEMATICS UNIVERSITY OF CHICAGO 5734 S. UNIVERSITY AVENUE CHICAGOIL60637 United States

We study the welfare function of the deterministic and stochastic shallow lake problem. We show that the welfare function is the viscosity solution of the associated Bellman equation, we establish several properties including its asymptotic behaviour at infinity and we present a convergent monotone numerical *** Codes 93E20, 60H10, 49L25 Copyright © 2017, The Authors. All rights reserved.

关键词： Stochastic systems

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Technologies for the ELGAR large scale atom interferometer array

arXiv

引用

arXiv 2020年

作者： Canuel, B. Abend, S. Amaro-Seoane, P. Badaracco, F. Beaufils, Q. Bertoldi, A. Bongs, K. Bouyer, P. Braxmaier, C. Chaibi, W. Christensen, N. Fitzek, F. Flouris, G. Gaaloul, N. Gaffet, S. Garrido Alzar, C.L. Geiger, R. Guellati-Khelifa, S. Hammerer, K. Harms, J. Hinderer, J. Holynski, M. Junca, J. Katsanevas, S. Klempt, C. Kozanitis, C. Krutzik, M. Landragin, A. Làzaro Roche, I. Leykauf, B. Lien, Y.-H. Loriani, S. Merlet, S. Merzougui, M. Nofrarias, M. Papadakos, P. Pereira dos Santos, F. Peters, A. Plexousakis, D. Prevedelli, M. Rasel, E.M. Rogister, Y. Rosat, S. Roura, A. Sabulsky, D.O. Schkolnik, V. Schlippert, D. Schubert, C. Sidorenkov, L. Siemß, J.-N. Sopuerta, C.F. Sorrentino, F. Struckmann, C. Tino, G.M. Tsagkatakis, G. Viceré, A. von Klitzing, W. Woerner, L. Zou, X. LP2N Laboratoire Photonique Numérique et Nanosciences Université Bordeaux-IOGS-CNRS:UMR 5298 rue F. Mitterrand TalenceF-33400 France Leibniz Universität Hannover Institut für Quantenoptik Welfengarten 1 HannoverD-30167 Germany 08193 Spain Carrer del Gran Capità 2-4 Edifici Nexus despatx 201 Barcelona08034 Spain Kavli Institute for Astronomy and Astrophysics Beijing100871 China Institute of Applied Mathematics Academy of Mathematics and Systems Science CAS Beijing100190 China Zentrum für Astronomie und Astrophysik TU Berlin Hardenbergstraße 36 Berlin10623 Germany L’AquilaI-67100 Italy INFN Laboratori Nazionali del Gran Sasso AssergiI-67100 Italy LNE-SYRTE Observatoire de Paris Université PSL CNRS Sorbonne Université 61 avenue de l’Observatoire PARISF-75014 France Midlands Ultracold Atom Research Centre School of Physics and Astronomy University of Birmingham BirminghamB15 2TT United Kingdom ZARM Unversity of Bremen Am Fallturm 2 Bremen28359 Germany DLR German Aerospace Center Linzer Strasse 1 Bremen28359 Germany ARTEMIS Université Côte d’Azur Observatoire de la Côte d’Azur CNRS NiceF-06304 France Leibniz University Hannover Appelstrasse 2 Hannover30167 Germany Institute of Computer Science Foundation for Research and Technology - Hellas Heraklion70013 Greece LSBB Laboratoire Souterrain Bas Bruit CNRS Avignon University - La grande combe Rustrel84400 France Laboratoire Kastler Brossel Sorbonne Université CNRS ENS-PSL Research University Collège de France 4 place Jussieu Paris75005 France Institut de Physique du Globe de Strasbourg UMR 7516 Université de Strasbourg/EOST CNRS 5 rue Descartes Strasbourg67084 France I-56021 Italy Humboldt-Universität zu Berlin Institute of Physics Newtonstrasse 15 Berlin12489 Germany Computer Science Department University of Crete Heraklion70013 Greece Dept. of Physics and Astronomy Univ. of Bologna Via Berti-Pichat 6/2 BolognaI-40126 Italy Söflinger Str. 100 Ulm

We proposed the European Laboratory for Gravitation and Atom-interferometric research (ELGAR), an array of atom gradiometers aimed at studying space-time and gravitation with the primary goal of observing gravitational waves (GWs) in the infrasound band with a peak strain sensitivity of 3.3×10−22/√Hz at 1.7 Hz. In this paper we detail the main technological bricks of this large scale detector and emphasis the research pathways to be conducted for its realization. We discuss the site options, atom optics, and source requirements needed to reach the target sensitivity. We then discuss required seismic isolation techniques, Gravity Gradient Noise reduction strategies, and the metrology of various noise couplings to the detector. Copyright © 2020, The Authors. All rights reserved.

关键词： Atoms

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Effect of climate on traits of dominant and rare tree species in the world’s forests

引用

Nature Communications 2025年第1期16卷 1-15页

作者： Hordijk, Iris Poorter, Lourens Liang, Jingjing Reich, Peter B. de-Miguel, Sergio Nabuurs, Gert-Jan Gamarra, Javier G. P. Chen, Han Y. H. Zhou, Mo Wiser, Susan K. Pretzsch, Hans Paquette, Alain Picard, Nicolas Hérault, Bruno Bastin, Jean-Francois Alberti, Giorgio Abegg, Meinrad Adou Yao, Yves C. Almeyda Zambrano, Angelica M. Alvarado, Braulio V. Alvarez-Davila, Esteban Alvarez-Loayza, Patricia Alves, Luciana F. Amaral, Iêda Ammer, Christian Antón-Fernández, Clara Araujo-Murakami, Alejandro Arroyo, Luzmila Avitabile, Valerio Aymard C, Gerardo A. Baker, Timothy Banki, Olaf Barroso, Jorcely Bastian, Meredith L. Birigazzi, Luca Birnbaum, Philippe Bitariho, Robert Boeckx, Pascal Bongers, Frans Bouriaud, Olivier Brancalion, Pedro H. S. Brandl, Susanne Brearley, Francis Q. Brienen, Roel Broadbent, Eben N. Bruelheide, Helge Cazzolla Gatti, Roberto Cesar, Ricardo G. Cesljar, Goran Chazdon, Robin L. Chisholm, Chelsea Cienciala, Emil Clark, Connie J. Clark, David B. Colletta, Gabriel Coomes, David Cornejo Valverde, Fernando Corral-Rivas, Jose J. Crim, Philip Cumming, Jonathan Dayanandan, Selvadurai de Gasper, André L. Decuyper, Mathieu Derroire, Géraldine DeVries, Ben Djordjevic, Ilija Dourdain, Aurélie Dolezal, Jiri Engone Obiang, Nestor Laurier Enquist, Brian Eyre, Teresa Fandohan, Adandé Belarmain Fayle, Tom M. Ferreira, Leandro V. Feldpausch, Ted R. Finér, Leena Fischer, Markus Fletcher, Christine Frizzera, Lorenzo Gianelle, Damiano Glick, Henry B. Harris, David Hector, Andrew Hemp, Andreas Herbohn, John Hillers, Annika Honorio Coronado, Eurídice N. Hui, Cang Cho, Hyunkook Ibanez, Thomas Jung, Ilbin Imai, Nobuo Jagodzinski, Andrzej M. Jaroszewicz, Bogdan Johannsen, Vivian Joly, Carlos A. Jucker, Tommaso Karminov, Viktor Kartawinata, Kuswata Kearsley, Elizabeth Kenfack, David Kennard, Deborah Kepfer-Rojas, Sebastian Keppel, Gunnar Khan, Mohammed Latif Killeen, Timothy Kim, Hyun Seok Kitayama, Kanehiro Köhl, Michael Korjus, Henn Kraxner, Florian Laarmann, Diana Lang, Mait Lewis, Simon Lu, Huicui Lukina, Natalia Maitner, Br Institute of Integrative Biology ETH Zurich (Swiss Federal Institute of Technology) Zurich Switzerland Wageningen University and Research Wageningen Netherlands Department of Forestry and Natural Resources Purdue University West Lafayette IN United States Department of Forest Resources University of Minnesota St Paul MN United States Hawkesbury Institute for the Environment Western Sydney University Penrith NSW Australia Department of Agricultural and Forest Sciences and Engineering University of Lleida Lleida Spain Forest Science and Technology Centre of Catalonia (CTFC) Solsona Spain Forestry Division Food and Agriculture Organization of the United Nations Rome Italy Faculty of Natural Resources Management Lakehead University Thunder Bay ON Canada Manaaki Whenua–Landcare Research Lincoln New Zealand Chair for Forest Growth and Yield Science TUM School for Life Sciences Technical University of Munich Munich Germany Centre for Forest Research Université du Québec à Montréal Montréal QC Canada GIP ECOFOR Paris France CIRAD Forêts et Sociétés Montpellier France Forêts et Sociétés Univ Montpellier CIRAD Montpellier France Gembloux Agro Bio-Tech University of Liege Liege Belgium Faculty of Science and Technology Free University of Bolzano Bolzano Italy Department of Agricultural Food Environmental and Animal Sciences University of Udine Udine Italy Swiss Federal Institute for Forest Snow and Landscape Research WSL Birmensdorf Switzerland UFR Biosciences University Félix Houphouët-Boigny Abidjan Cote d'Ivoire Spatial Ecology and Conservation Laboratory Center for Latin American Studies University of Florida Gainesville FL United States Forestry School Tecnológico de Costa Rica TEC Cartago Costa Rica Fundacion ConVida Universidad Nacional Abierta y a Distancia UNAD Medellin Colombia Field Museum of Natural History Chicago IL United States Center for Tropical Research Institute of the Environment and Sustainability UCLA Los Angeles CA

Species’ traits and environmental conditions determine the abundance of tree species across the globe. The extent to which traits of dominant and rare tree species differ remains untested across a broad environmental range, limiting our understanding of how species traits and the environment shape forest functional composition. We use a global dataset of tree composition of >22,000 forest plots and 11 traits of 1663 tree species to ask how locally dominant and rare species differ in their trait values, and how these differences are driven by climatic gradients in temperature and water availability in forest biomes across the globe. We find three consistent trait differences between locally dominant and rare species across all biomes;dominant species are taller, have softer wood and higher loading on the multivariate stem strategy axis (related to narrow tracheids and thick bark). The difference between traits of dominant and rare species is more strongly driven by temperature compared to water availability, as temperature might affect a larger number of traits. Therefore, climate change driven global temperature rise may have a strong effect on trait differences between dominant and rare tree species and may lead to changes in species abundances and therefore strong community reassembly. © The Author(s) 2025.

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Control relaxation via dephasing: A quantum-state-diffusion study

引用

Physical Review A 2018年第1期97卷 012104-012104页

作者： Jun Jing Ting Yu Chi-Hang Lam J. Q. You Lian-Ao Wu Department of Physics Zhejiang University Hangzhou 310027 Zhejiang China Department of Theoretical Physics and History of Science University of the Basque Country EHU UPV P.O. Box 644 48080 Bilbao Spain and Ikerbasque Basque Foundation for Science 48011 Bilbao Spain Beijing Computational Science Research Center Beijing 100193 China Center for Controlled Quantum Systems and Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken New Jersey 07030 USA Department of Applied Physics Hong Kong Polytechnic University Hung Hom Hong Kong China

Dynamical decoupling as a quantum control strategy aims at suppressing quantum decoherence adopting the popular philosophy that the disorder in the unitary evolution of the open quantum system caused by environmental noises should be neutralized by a sequence of ordered or well-designed external operations acting on the system. This work studies the solution of quantum-state-diffusion equations by mixing two channels of environmental noises, i.e., relaxation (dissipation) and dephasing. It is interesting to find in two-level and three-level atomic systems that a non-Markovian relaxation or dissipation process can be suppressed by a Markovian dephasing noise. The discovery results in an anomalous control strategy by coordinating relaxation and dephasing processes. Our approach opens an avenue of noise control strategy with no artificial manipulation over the open quantum systems.

关键词： Open quantum systems & decoherence Quantum fluctuations & noise

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