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Measurements of π±, K±, p and p¯ spectra in 7Be+9Be collisions at beam momenta from 19A to 150A GeV/c with the NA61/SHINE spectrometer at the CERN SPS

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arXiv 2020年

作者： Acharya, A. Adhikary, H. Aduszkiewicz, A. Allison, K.K. Andronov, E.V. Antićić, T. Babkin, V. Baszczyk, M. Bhosale, S. Blondel, A. Bogomilov, M. Brandin, A. Bravar, A. Brylinski, W. Brzychczyk, J. Buryakov, M. Busygina, O. Bzdak, A. Cherif, H. Ćirković, M. Csanad, M. Cybowska, J. Czopowicz, T. Damyanova, A. Davis, N. Deliyergiyev, M. Deveaux, M. Dmitriev, A. Dominik, W. Dorosz, P. Dumarchez, J. Engel, R. Feofilov, G.A. Fields, L. Fodor, Z. Garibov, A. Gaździcki, M. Golosov, O. Golovatyuk, V. Golubeva, M. Grebieszkow, K. Guber, F. Haesler, A. Igolkin, S.N. Ilieva, S. Ivashkin, A. Johnson, S.R. Kadija, K. Kargin, N. Kashirin, E. Kielbowicz, M. Kireyeu, V.A. Klochkov, V. Kolesnikov, V.I. Kolev, D. Korzenev, A. Kovalenko, V.N. Kowalski, S. Koziel, M. Kozlowski, B. Krasnoperov, A. Kucewicz, W. Kuich, M. Kurepin, A. Larsen, D. László, A. Lazareva, T.V. Lewicki, M. Lojek, K. Lyubushkin, V.V. Maćkowiak-Pawlowska, M. Majka, Z. Maksiak, B. Malakhov, A.I. Marcinek, A. Marino, A.D. Marton, K. Mathes, H.-J. Matulewicz, T. Matveev, V. Melkumov, G.L. Merzlaya, A.O. Messerly, B. Mik, L. Morozov, S. Mrówczynski, S. Nagai, Y. Naskręt, M. Ozvenchuk, V. Paolone, V. Petukhov, O. Planeta, R. Podlaski, P. Popov, B.A. Porfy, B. Posiadala-Zezula, M. Prokhorova, D.S. Pszczel, D. Pulawski, S. Puzović, J. Ravonel, M. Renfordt, R. Röhrich, D. Rondio, E. Roth, M. Rumberger, B.T. Rumyantsev, M. Rustamov, A. Rybczynski, M. Rybicki, A. Sadhu, S. Sadovsky, A. Schmidt, K. Selyuzhenkov, I. Seryakov, A.Yu. Seyboth, P. Slodkowski, M. Staszel, P. Stefanek, G. Stepaniak, J. Strikhanov, M. Ströbele, H. Šuša, T. Taranenko, A. Tefelska, A. Tefelski, D. Tereshchenko, V. Toia, A. Tsenov, R. Turko, L. Ulrich, R. Unger, M. Uzhva, D. Valiev, F.F. Veberič, D. Vechernin, V.V. Wickremasinghe, A. Wlodarczyk, Z. Wojcik, K. Wyszynski, O. Zimmerman, E.D. Zwaska, R. National Nuclear Research Center Baku Azerbaijan Faculty of Physics University of Sofia Sofia Bulgaria Ruder ¯ Bošković Institute Zagreb Croatia LPNHE University of Paris VI and VII Paris France Karlsruhe Institute of Technology Karlsruhe Germany University of Frankfurt Frankfurt Germany Wigner Research Centre for Physics The Hungarian Academy of Sciences Budapest Hungary University of Bergen Bergen Norway Jan Kochanowski University Kielce Poland Institute of Nuclear Physics Polish Academy of Sciences Cracow Poland National Centre for Nuclear Research Warsaw Poland Jagiellonian University Cracow Poland AGH - University of Science and Technology Cracow Poland University of Silesia Katowice Poland University of Warsaw Warsaw Poland University of Wroclaw Wroclaw Poland Warsaw University of Technology Warsaw Poland Institute for Nuclear Research Moscow Russia Joint Institute for Nuclear Research Dubna Russia National Research Nuclear University Moscow Engineering Physics Institute Moscow Russia St. Petersburg State University St. Petersburg Russia University of Belgrade Belgrade Serbia University of Geneva Geneva Switzerland Fermilab Batavia United States University of Colorado Boulder United States University of Pittsburgh Pittsburgh United States

The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of π±, K±, p and p¯ produced in the 20% most central 7Be+9Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150A GeV/c. The energy dependence of the K±/π± ratios as well as of inverse slope parameters of the K± transverse mass distributions are close to those found in inelastic p+p reactions. The new results are compared to the world data on p+p and Pb+Pb collisions as well as to predictions of the EPOS, UrQMD, AMPT, PHSD and SMASH models. Copyright © 2020, The Authors. All rights reserved.

关键词： Germanium alloys

Doping-dependent phonon anomaly and charge-order phenomena in the HgBa2CuO4+- A nd HgBa2CaCu2O6+-superconductors

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arXiv 2019年

作者： Wang, Lichen Yu, Biqiong Jing, Ran Luo, Xiangpeng Zeng, Junbang Li, Jiarui Bialo, Izabela Bluschke, Martin Tang, Yang Freyermuth, Jacob Yu, Guichuan Sutarto, Ronny He, Feizhou Weschke, Eugen Tabis, Wojciech Greven, Martin Li, Yuan International Center for Quantum Materials School of Physics Peking University Beijing100871 China School of Physics and Astronomy University of Minnesota Minneapolis Minnesota55455 United States Faculty of Physics and Applied Computer Science Agh University of Science and Technology Krakow30-059 Poland Institute of Solid State Physics TU Wien Vienna1040 Austria Max Planck Institute for Solid State Research StuttgartD-70569 Germany Wilhelm-Conrad-Rontgen-Campus Bessy II Helmholtz-Zentrum Berlin fur Materialien und Energie Berlin12489 Germany Canadian Light Source Saskatoon SaskatchewanS7N 2V3 Canada Collaborative Innovation Center of Quantum Matter Beijing100871 China

Using resonant X-ray diffraction and Raman spectroscopy, we study charge correlations and lattice dynamics in two model cuprates, HgBa2CuO4+δ and HgBa2CaCu2O6+δ. We observe a maximum of the characteristic charge order temperature around the same hole concentration (p≈0.09) in both compounds, and concomitant pronounced anomalies in the lattice dynamics that involve the motion of atoms in and/or adjacent to the CuO2 layers. These anomalies are already present at room temperature, and therefore precede the formation of the static charge correlations, and we attribute them to an instability of the CuO2 layers. Our finding implies that the charge order in the cuprates is an emergent phenomenon, driven by a fundamental variation in both lattice and electronic properties as a function of doping. Copyright © 2019, The Authors. All rights reserved.

关键词： Electronic properties

Signatures of crypto-currency market decoupling from the Forex

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arXiv 2019年

作者： Drożdż, Stanislaw Minati, Ludovico Oświȩcimka, Pawel Stanuszek, Marek Watorek, Marcin Complex Systems Theory Department Institute of Nuclear Physics Polish Academy of Sciences ul. Radzikowskiego 152 Kraków31-342 Poland Faculty of Physics Mathematics and Computer Science Cracow University of Technology ul. Warszawska 24 Kraków31-155 Poland

Based on the high-frequency recordings from Kraken, a cryptocurrency exchange and professional trading platform that aims to bring Bitcoin and other cryptocurrencies into the mainstream, the multiscale cross-correlations involving the Bitcoin (BTC), Ethereum (ETH), Euro (EUR) and US dollar (USD) are studied over the period between July 1, 2016 and December 31, 2018. It is shown that the multiscaling characteristics of the exchange rate fluctuations related to the cryptocurrency market approach those of the Forex. This, in particular, applies to the BTC/ETH exchange rate, whose Hurst exponent by the end of 2018 started approaching the value of 0.5, which is characteristic of the mature world markets. Furthermore, the BTC/ETH direct exchange rate has already developed multifractality, which manifests itself via broad singularity spectra. A particularly significant result is that the measures applied for detecting cross-correlations between the dynamics of the BTC/ETH and EUR/USD exchange rates do not show any noticeable relationships. This may be taken as an indication that the cryptocurrency market has begun decoupling itself from the Forex. Copyright © 2019, The Authors. All rights reserved.

关键词： Blockchain

Isospin diffusion measurement from the direct detection of a quasiprojectile remnant

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Physical Review C 2021年第1期103卷 014605-014605页

作者： A. Camaiani G. Casini S. Piantelli A. Ono E. Bonnet R. Alba S. Barlini B. Borderie R. Bougault C. Ciampi A. Chbihi M. Cicerchia M. Cinausero J. A. Dueñas D. Dell'Aquila Q. Fable D. Fabris C. Frosin J. D. Frankland F. Gramegna D. Gruyer K. I. Hahn M. Henri B. Hong S. Kim A. Kordyasz M. J. Kweon H. J. Lee J. Lemarié N. LeNeindre I. Lombardo O. Lopez T. Marchi S. H. Nam P. Ottanelli M. Parlog G. Pasquali G. Poggi J. Quicray A. A. Stefanini S. Upadhyaya S. Valdré E. Vient Dipartimento di Fisica Università di Firenze Firenze Italy INFN Sezione di Firenze Firenze Italy Department of Physics Tohoku University Sendai 980-8578 Japan SUBATECH Université de Nantes IMT Atlantique IN2P3/CNRS 4 Rue Alfred Kastler 44307 Nantes Cedex 3 France INFN Laboratori Nazionali del Sud Via S. Sofia 62 95125 Catania Italy Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay France Normandie Université ENSICAEN UNICAEN CNRS/IN2P3 LPC Caen 14000 Caen France Grand Accélérateur National d'Ions Lourds (GANIL) CEA/DRF–CNRS/IN2P3 Boulevard Henri Becquerel F-14076 Caen France INFN Laboratori Nazionali di Legnaro 35020 Legnaro Italy Departamento de Ingeniería Eléctrica y Centro de Estudios Avanzados en Física Matemáticas y Computación Universidad de Huelva 21007 Huelva Spain Dipartimento di Chimica e Farmacia Università degli Studi di Sassari Sassari Italy INFN–Laboratori Nazionali del Sud Catania Italy INFN Sezione di Padova 35131 Padova Italy Department of Science Education Ewha Womans University Seoul 03760 Republic of Korea Center for Extreme Nuclear Matters (CENuM) Korea University Seoul 02841 Republic of Korea Department of Physics Korea University Seoul 02841 Republic of Korea Heavy Ion Laboratory University of Warsaw 02-093 Warszawa Poland Department of Physics Inha University Incheon 22212 Republic of Korea INFN Sezione di Catania 95123 Catania Italy “Horia Hulubei” National Institute of Physics and Nuclear Engineering (IFIN-HH) RO-077125 Bucharest Magurele Romania Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University 30-348 Kracow Poland

The neutron-proton (n-p) equilibration process in Ca48+Ca40 at 35 MeV/nucleon bombarding energy is experimentally estimated by means of the isospin transport ratio. Experimental data are collected with a subset of the FAZIA telescope array, which permits us to determine the Z and N of detected fragments. For the first time, the quasiprojectile (QP) evaporative channel is compared with the QP breakup one in a homogeneous and consistent way, pointing to comparable n-p equilibration, which suggests a close interaction time between projectile and target independently of the exit channel. Moreover, in the QP evaporative channel n-p equilibration is compared with the prediction of the antisymmetrized molecular dynamics model coupled with the Gemini statistical model as an afterburner, showing a higher probability of proton and neutron transfers in the simulation with respect to the experimental data.

关键词： Low & intermediate energy heavy-ion reactions Nuclear fragmentation Nuclear reactions

Exploring the NΛ-NΣ coupled system with high precision correlation techniques at the LHC

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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. 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. 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. Capon, A.A. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Casula, E.A.R. Catalano, F. Ceballos Sanchez, C. Chakraborty, P. Bologna Italy Dipartimento DET 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 Dipartime

The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizeable coupling strength of the NΣ ↔ NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs, from zero relative momentum up to the opening of the NΣ channel. The correlation function in the relative momentum space for pΛ ⊕ pΛ pairs measured in high-multiplicity triggered pp collisions at √s = 13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k* = 289 MeV/c. This represents the first direct experimental observation of the NΣ ↔ NΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣ ↔ NΛ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars. © 2021, CC BY.

关键词： Momentum

Cosmic ray ensembles from ultra-high energy photons propagating in the galactic and intergalactic space

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arXiv 2019年

作者： Dhital, Niraj Sushchov, Oleksandr Pekala, Jan Cheminant, Kevin Almeida Góra, Dariusz Homola, Piotr Duffy, Alan R. Jagoda, Pawel Kaminski, Robert Kasztelan, Marcin Kovacs, Peter Nazari, Vahab Niedzwiecki, Michal Smelcerz, Katarzyna Smolek, Karel Rzecki, Krzysztof Zamora-Saa, Jilberto Zimborás, Zoltán Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Cracow Poland Centre for Astrophysics and Supercomputing Swinburne University of Technology HawthornVIC3122 Australia AGH University of Science and Technology Cracow30-059 Poland National Centre for Nuclear Research Andrzeja Soltana 7 Otwock Swierk05-400 Poland Institute for Particle and Nuclear Physics Wigner Research Centre for Physics Hungarian Academy of Sciences BudapestH-1525 Hungary Joint Institute for Nuclear Research Dubna Russia Institute of Telecomputing Faculty of Physics Mathematics and Computer Science Cracow University of Technology Warszawska 24st Cracow31-155 Poland Institute of Experimental and Applied Physics Czech Technical University Prague Czech Republic Cracow University of Technology Warszawska 24 Cracow31-155 Poland Universidad Andres Bello Departamento de Ciencias Fisicas Facultad de Ciencias Exactas Avenida Republica 498 Santiago Chile

Propagation of ultra-high energy photons in the galactic and intergalactic space gives rise to cascades comprising thousands of photons. Using Monte Carlo simulations, we investigate the development of such cascades in the solar magnetosphere, and find that the photons in the cascades are distributed over hundreds of kilometers as they arrive at the top of the Earth’s atmosphere. We also perform similar study for cascades starting as far as 10 Mpc away from us using relevant magnetic field models. A few photons correlated in time are expected to arrive at the Earth from the latter type of cascade. We present our simulation results and discuss the prospects for detection of these cascades with the Cosmic-Ray Extremely Distributed Observatory. Copyright © 2019, The Authors. All rights reserved.

关键词： Photons

The ABC130 barrel module prototyping programme for the ATLAS strip tracker

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arXiv 2020年

作者： Poley, Luise Sawyer, Craig Addepalli, Sagar Affolder, Anthony Allongue, Bruno Allport, Phil Anderssen, Eric Anghinolfi, Francis Arguin, Jean-François Arling, Jan-Hendrik Arnaez, Olivier Asbah, Nedaa Alexandra Ashby, Joe Asimakopoulou, Eleni Myrto Atlay, Naim Bora Bartsch, Ludwig Basso, Matthew J. Beacham, James Beaupré, Scott L. Beck, Graham Beichert, Carl Bergsten, Laura Bernabeu, Jose Bhattarai, Prajita Bloch, Ingo Blue, Andrew Bochenek, Michal Botte, James Boynton, Liam Brenner, Richard Brueers, Ben Buchanan, Emma Bullard, Brendon Capocasa, Francesca Carr, Isabel Carra, Sonia Chao, Chen Wen Chen, Jiayi Chen, Liejian Chen, Yebo Chen, Xin Cindro, Vladimir Ciocio, Alessandra Civera, Jose V. Cormier, Kyle Cornell, Ella Crick, Ben Dabrowski, Wladyslaw Dam, Mogens David, Claire Demontigny, Gabriel Dette, Karola DeWitt, Joel Diez, Sergio Doherty, Fred Dopke, Jens Dressnandt, Nandor Edwards, Sam Fadeyev, Vitaliy Farrington, Sinead Fawcett, William Fernandez-Tejero, Javier Filmer, Emily Fleta, Celeste Gallop, Bruce Galloway, Zachary Argos, Carlos Garcia Garg, Diksha Gignac, Matthew Gillberg, Dag Giovinazzo, Dena Glover, James Goettlicher, Peter Gonella, Laura Gorišek, Andrej Grant, Charles Grant, Fiona Gray, Calum Greenall, Ashley Gregor, Ingrid-Maria Greig, Graham Grillo, Alexander A. Gu, Shan Guescini, Francesco da Costa, Joao Barreiro Guimaraes Gunnell, Jane Gupta, Ruchi Haber, Carl Halgheri, Amogh Hamersly, Derek Haugen, Tom-Erik Hauser, Marc Heim, Sarah Heim, Timon Helling, Cole Herde, Hannah Hessey, Nigel P. Hommels, Bart Hönig, Jan Cedric Hunter, Amelia Jackson, Paul Jewkes, Keith John, Jaya John Johnson, Thomas Allan Jones, Tim Kachiguin, Serguei Kang, Nathan Kaplon, Jan Kareem, Mohammad Keener, Paul Keller, John Key-Charriere, Michelle Kilani, Samer Kisliuk, Dylan Klein, Christoph Thomas Koffas, Thomas Kramberger, Gregor Krizka, Karol Kroll, Jiri Kuehn, Susanne Kurth, Matthew Labitan, Charilou Lacasta, Carlos Lacker, Heiko León, Pablo Li, Boyang Li, Chenyang Li, Yiming Li, Zhiying Liang, Zhijun Liberatore, Mar Lawrence Berkeley National Laboratory Cyclotron Road Berkeley United States Particle Physics Department STFC Rutherford Appleton Laboratory Harwell Science and Innovation Campus Didcot United Kingdom Martin A. Fisher School of Physics Brandeis University Waltham United States Santa Cruz Institute of Particle Physics University of California High Street Santa Cruz United States Experimental Physics Department CERN Geneva Switzerland School of Physics and Astronomy University of Birmingham Edgabston Birmingham United Kingdom Group of Particle Physics University of Montreal Rue University Montreal Canada Deutsches Elektronen-Synchrotron Notkestraße Hamburg Germany Department of Physics University of Toronto Saint George St. Toronto Canada Jefferson Laboratory of Physics Harvard University Oxford Street Cambridge United States SUPA School of Physics and Astronomy University of Glasgow University Avenue Glasgow United Kingdom Department of Physics and Astronomy Uppsala Universitet Uppsala Sweden Institut für Physik Humboldt-Universität zu Berlin Berlin Germany Department of Physics Duke University Science Dr. Durham United States Department of Physics Simon Fraser University University Drive W Burnaby Canada School of Physics and Astronomy Queen Mary University of London Mile End Road London United Kingdom Instituto de Física Corpuscular CSIC-Universidad de Valencia c/ Catedrático José Beltrán Paterna Spain Department of Physics and Astronomy University of Pennsylvania South 33rd Street Philadelphia United States Department of Physics Carleton University Colonel By Drive Ottawa Canada Department of Physics University of Liverpool Oxford Street Liverpool United Kingdom Institute of High Energy Physics Yuquan Road Beijing China State Key Laboratory of Particle Detection and Electronics Beijing China School of Physics University of Melbourne Swanston Street Parkville Australia University of Chinese Academy of Sciences Yuquan Road Beijing

For the Phase-II Upgrade of the ATLAS Detector [1], its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100 % silicon tracker, composed of a pixel tracker at inner radii and a strip tracker at outer radii. The future ATLAS strip tracker will include 11,000 silicon sensor modules in the central region (barrel) and 7,000 modules in the forward region (end-caps), which are foreseen to be constructed over a period of 3.5 years. The construction of each module consists of a series of assembly and quality control steps, which were engineered to be identical for all production sites. In order to develop the tooling and procedures for assembly and testing of these modules, two series of major prototyping programs were conducted: an early program using readout chips designed using a 250 nm fabrication process (ABCN-25) [2] [3] and a subsequent program using a follow-up chip set made using 130 nm processing (ABC130 and HCC130 chips). This second generation of readout chips was used for an extensive prototyping program that produced around 100 barrel-type modules and contributed significantly to the development of the final module layout. This paper gives an overview of the components used in ABC130 barrel modules, their assembly procedure and findings resulting from their tests. Copyright © 2020, The Authors. All rights reserved.

关键词： Pixels

Search for long-lived, massive particles in events with a displaced vertex and a muon with large impact parameter in pp collisions at s=13 TeV with the ATLAS detector

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Physical Review D 2020年第3期102卷 032006-032006页

作者： G. Aad B. Abbott D. C. Abbott A. Abed Abud K. Abeling D. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya B. Achkar S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa D. Alexandre T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. Alvarez Estevez D. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. R. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster A. Armstrong O. Arnaez H. Arnold Z. P. Arrubarrena Tame A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. B. Atlay H. Atmani K. Augsten G. Avolio R. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos H. Bachacou K. Bachas M. Backes F. Backman P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. R. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker D. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio D. Barberis M. Barbero G. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States of America Department of Physics University of Massachusetts Amherst MA United States of America INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto ON Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne IL United States of America INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAPP Université Grenoble Alpes Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb IL United States of America Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz CA United States of America IJCLab Université Paris-Saclay CNRS/IN2P3 91405 Orsay Franc

A search for long-lived particles decaying into hadrons and at least one muon is presented. The analysis selects events that pass a muon or missing-transverse-momentum trigger and contain a displaced muon track and a displaced vertex. The analyzed dataset of proton-proton collisions at s=13 TeV was collected with the ATLAS detector and corresponds to 136 fb−1. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particle decays that occur in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are presented as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and interpreted as exclusion limits in scenarios with pair production of long-lived top squarks that decay via a small R-parity-violating coupling into a quark and a muon. Top squarks with masses up to 1.7 TeV are excluded for a lifetime of 0.1 ns, and masses below 1.3 TeV are excluded for lifetimes between 0.01 ns and 30 ns.

关键词： Supersymmetric models

Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p-Pb collisions at √sNN = 8.16 TeV

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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. 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. Capon, A.A. Carnesecchi, F. Caron, R. Castillo Castellanos, J. Casula, E.A.R. Catalano, F. Ceballos Sanchez, C. 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 Università'La Sapienza' Sezione INFN Rome Italy Dipartimento di Fisica Universitàand Sezione INFN Cagliari Italy Dipartimento di Fisica Universitàand Sezione INFN Trieste Italy Dipartimento di Fisica Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia Universitàand Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia Universitàand Sezione INFN Catania Italy Dipartimento di Fisica e Astronomia Universitàand Sezione INFN Padova Italy Dipartimento di Fisica e Nucleare e Teorica Università di Pavia Pavia Italy Dipartime

Neutral pion (π0) and η meson production cross sections were measured up to unprecedentedly high transverse momenta (pT) in p-Pb collisions at √sNN = 8.16 TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval −1.3 T T pPb) is presented for pT up to of 200 and 30 GeV/c, where the former was achieved by extending the π0 measurement in pp collisions at √s = 8 TeV using the merged cluster technique. The values of RpPb are below unity for pT T > 10 GeV/c, leaving essentially no room for final state energy loss. The new data provide strong constraints for nuclear parton distribution and fragmentation functions over a broad kinematic range and are compared to model predictions as well as previous results at √sNN = 5.02 TeV. © 2021, CC BY.

关键词： Bosons