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arXiv 2022年

作者： Jeon, H.B. Kang, K.H. Park, H. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bernlochner, F. Bessner, M. Bhardwaj, V. Bhuyan, B. Bilka, T. Bobrov, A. Bodrov, D. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T.E. Budano, A. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. Dash, N. De Pietro, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Giri, A. Goldenzweig, P. Golob, B. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hara, T. Hayasaka, K. Hayashii, H. Hedges, M.T. Higuchi, T. Hou, W.-S. Hsu, C.-L. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jang, E.-J. Jia, S. Jin, Y. Joo, K.K. Kahn, J. Kakuno, H. Kaliyar, A.B. Kawasaki, T. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, K.-H. Kim, K.T. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kumar, M. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lai, Y.-T. Lalwani, K. Lam, T. Lange, J.S. Laurenza, M. Lee, S.C. Li, C.H. Li, J. Li, Y. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. Martini, A. Masuda, M. Matsuda, T. Matvienko, D. Maurya, S.K. Merola, M. Metzner, F. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Nakao, M. Narwal, D. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pang, T. Pardi, S. Park, S.-H. Passeri, A. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Purohit, M.V. Röhrken, M. Rostomyan, A. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of Chung-Ang University Seoul06974 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States Duy Tan University Hanoi100000 Viet Nam University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai 200443 China Justus-Liebig-Universität Gießen Gießen 35392 Germany Gifu University Gifu501-1193 Japan Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan National Research University Higher School of Economics Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research SAS Nagar Mohali140306 India Indian Institute of Technology Satya Nagar Bhubaneswar751007 India Indian Institute of Technology Assam Guwahati781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino

We report the first search for the penguin-dominated process B0 → KS0KS0γ using the full data sample of 772 × 106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We do not observe any statistically significant signal yield in the KS0-pair invariant mass range 1 GeV/c2 KS0 KS0 2, and set the following upper limits at 90% confidence level: B(B0 → KS0KS0γ) −7, B(B0 → f2γ) × B(f2(1270) → KS0KS0) −7, and B(B0 → f2′γ)×B(f2′(1525) → KS0KS0) −7. Further, 90% confidence upper limits have also been set in the range of [0.7–2.9]×10−7 on the B0 → KS0KS0γ branching fraction in bins of MKS0 KS0 . © 2022, CC BY.

关键词： Luminance

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Reaction coordinates and rate constants for liquid droplet nucleation: quantifying the interplay between driving force and memory

arXiv

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arXiv 2019年

作者： Tsai, Sun-Ting Smith, Zachary Tiwary, Pratyush Department of Physics Institute for Physical Science and Technology University of Maryland College Park20742 United States Biophysics Program Institute for Physical Science and Technology University of Maryland College Park20742 United States Department of Chemistry and Biochemistry Institute for Physical Science and Technology University of Maryland College Park20742 United States

In this work we revisit the classic problem of homogeneous nucleation of a liquid droplet in a supersaturated vapor phase. We consider this at different extents of the driving force, which here is the extent of supersaturation, and calculate a reaction coordinate (RC) for nucleation as the driving force is varied. The RC is constructed as a linear combination of three order parameters, where one accounts for the number of liquid-like atoms, and the other two for local density fluctuations. The RC is calculated from all-atom biased and unbiased molecular dynamics (MD) simulations using the spectral gap optimization approach "SGOOP" [P. Tiwary and B. J. Berne, Proc. Natl. Acad. Sci. U. S. A. 113, 2839 (2016)]. Our key finding is that as the supersaturation decreases, the RC ceases to simply be the number of liquid-like atoms, and instead it becomes important to explicitly consider local density fluctuations that correlate with shape and density variations in the nucleus. All three order parameters are found to have similar barriers in their respective potentials of mean force, however, as the supersaturation decreases the density fluctuations decorrelate slower and thus carry longer memory. Thus at lower supersaturations density fluctuations are non-Markovian and can not be simply ignored from the RC by virtue of being noise. Finally, we use this optimized RC to calculate nucleation rates in the infrequent metadynamics framework, and show it leads to more accurate estimate of the nucleation rate with four orders of magnitude acceleration relative to unbiased MD. Copyright © 2019, The Authors. All rights reserved.

关键词： Atoms

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Measurement of f₁(1285) production in pp collisions at s = 13 TeV

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physics Letters, Section B: Nuclear, Elementary Particle and High-Energy physics 2025年 866卷

作者： Acharya, S. Agarwal, A. Aglieri Rinella, G. Aglietta, L. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Ahuja, I. Akindinov, A. Akishina, V. 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. Alvarado, J.R. Alvarez, C.O.R. Anaam, M.N. Andrei, C. Andreou, N. Andronic, A. Andronov, E. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Arnaldi, R. Arneiro, J.G.M.C.A. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Averyanov, D. Azmi, M.D. Baba, H. Badalà, A. Bae, J. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Banoo, Z. Barbasova, V. Barile, F. Barioglio, L. Barlou, M. Barman, B. Barnaföldi, G.G. Barnby, L.S. Barreau, E. 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, L.G.E. Beltran, Y.A.V. Bencedi, G. Bensaoula, A. Beole, S. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhattacharjee, B. Bianchi, L. Bielčík, J. Bielčíková, 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. Bok, J. Boldizsár, L. Bombara, M. Bond, P.M. Bonomi, G. Borel, H. Borissov, A. Borquez Carcamo, A.G. Botta, E. Bouziani, Y.E.M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G.E. Buchakchiev, V.D. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S.A. Cabanillas Noris, J.C. Cabrera, M.F.T. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.M.M. Camerini, P. Canedo, F.D.M. Cantway, S.L. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Castil A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Bose Institute Department of Physics Centre for Astroparticle Physics and Space Science (CAPSS) Kolkata India California Polytechnic State University San Luis Obispo CA United States Central China Normal University Wuhan China Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Centro de Investigación y de Estudios Avanzados (CINVESTAV) Mexico City and Mérida Mexico Chicago State University Chicago IL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju South Korea Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Creighton University Omaha NE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan South Korea Department of Physics Sejong University Seoul South Korea Department of Physics University of California Berkeley CA 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 Sezi

This study presents the first measurement of the f1(1285) resonance using the ALICE detector in inelastic proton–proton collisions at a center-of-mass energy of 13 TeV. The resonance is reconstructed at midrapidity (...

This study presents the first measurement of the f₁(1285) resonance using the ALICE detector in inelastic proton–proton collisions at a center-of-mass energy of 13 TeV. The resonance is reconstructed at midrapidity (|y|< 0.5) through the hadronic decay channel f₁(1285)→K_S⁰K^±π^∓. Key measurements include the determination of its mass, transverse-momentum integrated yield, and average transverse momentum. Additionally, the ratio of the transverse-momentum integrated yield of f₁(1285) to pion is compared with calculations from the canonical statistical hadronization model. The model calculation, assuming a zero total strangeness content for f₁(1285), reproduces the data within 1σ deviation, shedding light on the quark composition of f₁(1285). © 2025 CERN for the benefit of the ALICE Collaboration

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Search for the decay Bs0 → η′KS0

arXiv

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arXiv 2022年

作者： Gebauer, U. Beleño, C. Frey, A. Adachi, I. Adamczyk, K. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bessner, M. Bhardwaj, V. Bhuyan, B. Bilka, T. Biswal, J. Bobrov, A. Bonvicini, G. Bozek, A. Bračko, M. Browder, T.E. Campajola, M. Cao, L. Červenkov, D. Chang, M.-C. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. Dash, N. de Nardo, G. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Eidelman, S. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Giri, A. Goldenzweig, P. Golob, B. Gudkova, K. Hadjivasiliou, C. Halder, S. Hara, T. Hartbrich, O. Hayasaka, K. Hayashii, H. Hedges, M.T. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Jin, Y. Joo, C.W. Joo, K.K. Kahn, J. Kaliyar, A.B. Kang, K.H. Karyan, G. Kawasaki, T. Kichimi, H. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, S.H. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lange, J.S. Lee, I.S. Lee, S.C. Lewis, P. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. MacQueen, C. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Metzner, F. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Mrvar, M. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Nishimura, K. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pardi, S. Park, H. Park, S.-H. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Prencipe, E. Prim, M.T. Purohit, M.V. Röhrken, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sandilya, S. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Justus-Liebig-Universität Gießen Gießen 35392 Germany II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Guwahati Assam 781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy J. Stefan Institute Ljubljana1000 Slovenia Institut f

We report the results of the first search for the decay Bs0 → η′KS0 using 121.4 fb−1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe no signal and set a 90% confidence-level upper limit of 8.16 × 10−6 on the Bs0 → η′KS0 branching fraction. Copyright © 2022, The Authors. All rights reserved.

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First polarisation measurement of coherently photoproduced J/ψ in ultra-peripheral Pb–Pb collisions at s_NN=5.02 TeV

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physics Letters, Section B: Nuclear, Elementary Particle and High-Energy physics 2025年 865卷

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. Altsybeev, I. Alvarado, J.R. 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. 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. Belyaev, V. 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. 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. Cantway, S.L. Carabas, M. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Castillo Castellanos, J. Catalano, F. Ceballos Sanchez, C. Chakaberia, I. Chakraborty, P. Chandra, S. Chapeland, S. Chartier, M. Chattopa A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Bose Institute Department of Physics Centre for Astroparticle Physics and Space Science (CAPSS) Kolkata India California Polytechnic State University San Luis Obispo CA United States Central China Normal University Wuhan China Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Centro de Investigación y de Estudios Avanzados (CINVESTAV) Mexico City and Mérida Mexico Chicago State University Chicago IL United States China Institute of Atomic Energy Beijing China Chungbuk National University Cheongju South Korea Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad Islamabad Pakistan Creighton University Omaha NE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan South Korea Department of Physics Sejong University Seoul South Korea Department of Physics University of California Berkeley CA 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

The first measurement of the polarisation of coherently photoproduced J/ψ mesons in ultra-peripheral Pb–Pb collisions, using data at sNN=5.02 TeV, is presented. The J/ψ meson is measured via its dimuon decay channe...

The first measurement of the polarisation of coherently photoproduced J/ψ mesons in ultra-peripheral Pb–Pb collisions, using data at s_NN=5.02 TeV, is presented. The J/ψ meson is measured via its dimuon decay channel in the forward rapidity interval −4.0−1 ± 5% (syst) is analysed. Hadronic activity is highly suppressed since the interaction is mediated by a photon. The polar and azimuthal angle distributions of the decay muons are measured, and the polarisation parameters λ_θ, λ_φ, λ_θφ are extracted. The analysis is carried out in the helicity frame. The results are found to be consistent with a transversely polarised J/ψ. These values are compared with previous measurements by the H1 and ZEUS experiments. The polarisation parameters of coherent J/ψ photoproduction in Pb–Pb collisions are found to be consistent with the s-channel helicity conservation hypothesis. © 2025 CERN for the benefit of the ALICE Collaboration

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EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies

arXiv

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arXiv 2023年

作者： Xu, Yi Ouchi, Masami Isobe, Yuki Nakajima, Kimihiko Ozaki, Shinobu Bouché, Nicolas F. Wise, John H. Emsellem, Eric Kusakabe, Haruka Hattori, Takashi Nagao, Tohru Chiaki, Gen Fukushima, Hajime Harikane, Yuichi Hayashi, Kohei Hirai, Yutaka Kim, Ji Hoon Maseda, Michael V. Nagamine, Kentaro Shibuya, Takatoshi Sugahara, Yuma Yajima, Hidenobu Aoyama, Shohei Fujimoto, Seiji Fukushima, Keita Hatano, Shun Inoue, Akio K. Ishigaki, Tsuyoshi Kawasaki, Masahiro Kojima, Takashi Komiyama, Yutaka Koyama, Shuhei Koyama, Yusei Lee, Chien-Hsiu Matsumoto, Akinori Mawatari, Ken Moriya, Takashi J. Motohara, Kentaro Murai, Kai Nishigaki, Moka Onodera, Masato Ono, Yoshiaki Rauch, Michael Saito, Tomoki Sasaki, Rin Suzuki, Akihiro Takeuchi, Tsutomu T. Umeda, Hiroya Umemura, Masayuki Watanabe, Kuria Yabe, Kiyoto Zhang, Yechi Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan University of Tokyo Chiba Kashiwa277-8583 Japan Department of Physics Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Univ Lyon Univ Lyon1 ENS de Lyon CNRS Centre de Recherche Astrophysique de Lyon UMR5574 Saint-Genis-LavalF-69230 France Center for Relativistic Astrophysics School of Physics Georgia Institute of Technology AtlantaGA30332 United States European Southern Observatory Karl-Schwarzschild-Straße 2 Garching85748 Germany Observatoire de Genéve Université de Genéve 51 Ch. des Maillettes Versoix1290 Switzerland 650 North A’ohoku Place HiloHI96720 United States Research Center for Space and Cosmic Evolution Ehime University Bunkyo-cho 2-5 Ehime Matsuyama790-8577 Japan Center for Computational Sciences University of Tsukuba Ten-nodai 1-1-1 Tsukuba Ibaraki305-8577 Japan Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom National Institute of Technology Ichinoseki College Hagisho Ichinoseki021-8511 Japan Astronomical Institute Tohoku University 6-3 Aoba Aramaki Aoba-ku Miyagi Sendai980-8578 Japan Department of Physics and Astronomy University of Notre Dame 225 Nieuwland Science Hall Notre DameIN46556 United States Astronomy Program Department of Physics and Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Center Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Department of Astronomy University of Wisconsin-Madison 475 N. Charter Street MadisonWI53706 United States Theoretical Astrophysics Department of Earth & Space S

We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of 0.015 − 0.195 Zo and low stellar masses of 104 − 108 Mo in the local universe. We conduct deep optical integral-field spectroscopy (IFS) for the low-mass EMPGs with the medium high resolution (R = 7500) grism of the 8m-Subaru FOCAS IFU instrument by the EMPRESS 3D survey, and investigate Hα emission of the EMPGs. Exploiting the resolution high enough for the low-mass galaxies, we derive gas dynamics with the Hα lines by the fitting of 3-dimensional disk models. We obtain an average maximum rotation velocity (vrot) of 15 ± 3 km s−1 and an average intrinsic velocity dispersion (σ0) of 27 ± 10 km s−1 for 15 spatially resolved EMPGs out of the 33 EMPGs, and find that all of the 15 EMPGs have vrot/σ0 rot/σ0 with the decreasing stellar mass and metallicity. We derive the gas mass fraction (fgas) for all of the 33 EMPGs, and find no clear dependence on stellar mass and metallicity. These vrot/σ0 and fgas trends should be compared with young high-z galaxies observed by the forthcoming JWST IFS programs to understand the physical origins of the EMPGs in the local universe. © 2023, CC BY.

关键词： Galaxies

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The Featherweight Giant: Unraveling the Atmosphere of a 17 Myr Planet with JWST

arXiv

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arXiv 2024年

作者： Thao, Pa Chia Mann, Andrew W. Feinstein, Adina D. Gao, Peter Thorngren, Daniel Rotman, Yoav Welbanks, Luis Brown, Alexander Duvvuri, Girish M. France, Kevin Longo, Isabella Sandoval, Angeli Christian Schneider, P. Wilson, David J. Youngblood, Allison Vanderburg, Andrew Barber, Madyson G. Wood, Mackenna L. Batalha, Natasha E. Kraus, Adam L. Murray, Catriona Anne Newton, Elisabeth R. Rizzuto, Aaron Tofflemire, Benjamin M. Tsai, Shang-Min Bean, Jacob L. Berta-Thompson, Zachory K. Evans-Soma, Thomas M. Froning, Cynthia S. Kempton, Eliza M.-R. Miguel, Yamila Sebastian Pineda, J. Department of Physics and Astronomy The University of North Carolina at Chapel Hill Chapel HillNC27599 United States Laboratory for Atmospheric and Space Physics University of Colorado Boulder UCB 600 BoulderCO80309 United States Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Earth and Planets Laboratory Carnegie Institution for Science 5241 Broad Branch Road NW WashingtonDC20015 United States Department of Physics & Astronomy Johns Hopkins University BaltimoreMD United States School of Earth and Space Exploration Arizona State University TempeAZ85281 United States Center for Astrophysics and Space Astronomy University of Colorado 389 UCB BoulderCO80309 United States Department of Physics and Astronomy Vanderbilt University NashvilleTN37235 United States Department of Astrophysical and Planetary Sciences University of Colorado UCB 389 BoulderCO80309 United States Astrophysics Program The CUNY Graduate Center City University of New York New YorkNY10016 United States Exoplanets and Stellar Astrophysics Laboratory NASA Goddard Space Flight Center GreenbeltMD20771 United States Hamburger Sternwarte Gojenbergsweg 112 HamburgD-21029 Germany Department of Physics Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States MIT Kavli Institute for Astrophysics Space Research Massachusetts Institute of Technology CambridgeMA02139 United States NASA Ames Research Center Moffett FieldCA94035 United States Department of Astronomy The University of Texas at Austin AustinTX78712 United States Department of Astrophysical and Planetary Sciences University of Colorado BoulderCO United States Department of Physics and Astronomy Dartmouth College HanoverNH03755 United States Mondo Level 26/2 Southbank Blvd SouthbankVIC3006 Australia Department of Earth and Planetary Sciences University of California RiversideCA United States

The characterization of young planets (⊕) planet, HIP 67522b, observed with JWST NIRSpec/G395H. To check for spot contamination, we obtain a simultaneous g-band transit with SOAR. The spectrum exhibits absorption features 30-50% deeper than the overall depth, far larger than expected from an equivalent mature planet, and suggests that HIP 67522 b's mass is ⊕ irrespective of cloud cover and stellar contamination. A Bayesian retrieval analysis returns a mass constraint of 13.8±1.0M⊕. This challenges the previous classification of HIP 67522b as a hot Jupiter and instead, positions it as a precursor to the more common sub-Neptunes. With a density of 3, HIP 67522 b is one of the lowest density planets known. We find strong absorption from H2O and CO2 (≥ 7σ), a modest detection of CO (3.5σ), and weak detections of H2S and SO2 ( 2σ). Comparisons with radiative-convective equilibrium models suggest supersolar atmospheric metallicities and solar-to-subsolar C/O ratios, with photochemistry further constraining the inferred atmospheric metallicity to 3×10 Solar due to the amplitude of the SO2 feature. These results point to the formation of HIP 67522b beyond the water snowline, where its envelope was polluted by icy pebbles and planetesimals. The planet is likely experiencing substantial mass loss (0.01-0.03 M⊕ Myr−1), sufficient for envelope destruction within a Gyr. This highlights the dramatic evolution occurring within the first 100 Myr of its existence. © 2024, CC BY.

关键词： Planets

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Inside Back Cover: Gapped and Rotated Grain Boundary Revealed in Ultra-Small Au Nanoparticles for Enhancing Electrochemical CO2Reduction (Angew. Chem. Int. Ed. 3/2025)

引用

Angewandte Chemie International Edition 2024年第3期64卷

作者： Wenying Wang Dr. Dong Chen Dr. Victor Fung Dr. Shengli Zhuang Yue Zhou Dr. Chengming Wang Guoqing Bian Dr. Yan Zhao Dr. Nan Xia Prof. Dr. Jin Li Prof. Dr. Haiteng Deng Dr. Lingwen Liao Prof. Dr. Jun Yang Prof. Dr. De-en Jiang Prof. Dr. Zhikun Wu Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology CAS Center for Excellence in Nanoscience Institute of Solid State Physics HFIPS Chinese Academy of Sciences 230031 Hefei P. R. China Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China 230026 Hefei P. R. China State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences 100190 Beijing P. R. China Department of Chemistry University of California 92521 Riverside CA USA School of Computational Science and Engineering Georgia Institute of Technology 30332 Atlanta Georgia USA Institute of Physical Science and Information Technology Anhui University 230601 Hefei P. R. China Instruments' Center for Physical Science University of Science and Technology of China 230026 Hefei P. R. China Tsinghua University-Peking University Joint Center for Life Sciences School of Life Sciences Tsinghua University 100084 Beijing P. R. China MOE Key Laboratory of Bioinformatics School of Life Sciences Tsinghua University 100084 Beijing P. R. China Department of Chemical and Biomolecular Engineering Vanderbilt University 37235 Nashville Tennessee USA

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Development and Anti-corrosion Performance of Polymeric Epoxy Resin and their Zinc Phosphate Composite on 15CDV6 Steel in 3wt% NaCl: Experimental and Computational Studies

引用

Journal of Bio- and Tribo-Corrosion 2020年第4期6卷 1-9页

作者： Dagdag, Omar Hsissou, Rachid El Harfi, Ahmed El Gana, Lahoucine Safi, Zaki Guo, Lei Verma, Chandrabhan Ebenso, Eno E. El Gouri, Mustapha Department of Process Engineering Height School of Technology Sidi Mohammed Ben Abdallah University P.O. Box 2427 Fes30000 Morocco Laboratory of Advanced Materials and Process Engineering Department of Chemistry Faculty of Science IbnTofail University BP 133 Kenitra14000 Morocco Laboratory of Optoelectronics Physical Chemistry of Materials and Environment Department of Physics Faculty of Science IbnTofail University BP 133 Kenitra14000 Morocco Chemistry Department Faculty of Science Al Azhar University-Gaza P.O Box 1277 Gaza Palestine School of Materials and Chemical Engineering Tongren University Tongren554300 China Center of Research Excellence in Corrosion Research Institute King Fahd University of Petroleum and Minerals Dhahran31261 Saudi Arabia Research Focus Area Faculty of Natural and Agricultural Sciences North-West University Private Bag X2046 Mmabatho2735 South Africa

Abstract: The evaluation of the anti-corrosive performance of polymer composite reinforced with zinc phosphate (DGEBA-DAA-ZP) acts as an effective anti-corrosive coating for 15CDV6 steel in 3wt% NaCl at different exposure times ranging from 60, 120, and 180 days in a salt spray chamber. EIS study revealed that composite formulation (DGEBA-DAA-ZP) acts as strong interface coating. Results showed that magnitude of charge transfer resistance (Rct) and coating resistance (Rpore) gradually decrease on increasing the exposure time. After 1 h exposure time, DGEBA-DAA-ZP formulation exhibited Rct and Rpore values of 16.6 kΩ cm2 and 6.16 kΩ cm2, respectively. However, after 180 days exposure, the Rct and Rpore values lower to Rct and Rpore to 4.21 kΩ cm2and 2.25 kΩ cm2, respectively. MD simulation study demonstrated that DGEBA-DAA-ZP adsorbed on the Cd surface using its flat orientation. Graphic Abstract: [Figure not available: see fulltext.]. © 2020, Crown.

关键词： Sodium chloride

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Innenrücktitelbild: Gapped and Rotated Grain Boundary Revealed in Ultra-Small Au Nanoparticles for Enhancing Electrochemical CO2Reduction (Angew. Chem. 3/2025)

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Angewandte Chemie 2024年第3期137卷

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