Multiplicity dependence of (anti-)deuteron production in pp collisions at $sqrt{s}$ = 7 TeV
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Kim,Martin Vala,Ashik Ikbal Sheikh,Sergey Sadovskiy,Boris Polishchuk,Chun-lu Huang,Bharati Naik,Kristin Fanebust Hetland,Sarita Sahoo,Hartmut Hillemanns,Dmitry Aleksandrov,Natasha Sharma,Lars Bratrud,Markus Keil,Erik Jens Brucken,Naoto Tanaka,Ankhi Roy,Sergey Nazarenko,Francesco Riggi,Vladimir Nikulin,Friederike Bock,Adela Kravcakova,Valentina Mantovani Sarti,Rajendra Nath Patra,Peter Kalinak,Davide Pagano,Bong-hwi Lim,Anthony Robert Timmins,Ciprian Mihai Mitu,Arseniy Shabanov,Igor Altsybeev,Borge Svane Nielsen,Shyam Kumar,Dario Berzano,Manoj Bhanudas Jadhav,Lais Ozelin De Lima Pimentel,Slavka Jadlovska,Mikhail Ippolitov,Ildefonso Leon Monzon,Despina Hatzifotiadou,Sadhana Dash,Silvia Arcelli,Christopher Daniel Anson,Andre Augustinus,Costin Grigoras,Nicolo' Valle,Mateusz Andrzej Ploskon,Ayben Karasu Uysal,Abraham Villatoro Tello,Domenico Colella,Camila De Conti,Dmitry Yurevich Peresunko,Marielle Chartier,Giacomo Volpe,Lukas Nellen,Sanjib Muhuri
arxiv(2019)
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摘要
In this letter, the production of deuterons and anti-deuterons in pp collisions at root s = 7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum (p(T)). The measurements are discussed in the context of hadron-coalescence models. The coalescence parameter B-2, extracted from the measured spectra of (anti-)deuteronsand primary (anti-)protons, exhibits no significant p(T)-dependence for p(T) < 3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B-2 parameter is found to decrease smoothly from low multiplicity pp to Pb-Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb-Pb collisions. The ratio between the p(T)-integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC. (C) 2019 The Author(s). Published by Elsevier B.V
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