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Abstract
The and production ratios are measured by the LHCb detector from 0.3 nb−1 of pp collisions delivered by the LHC at TeV and 1.8 nb−1 at TeV. Both ratios are presented as a function of transverse momentum, pT, and rapidity, y, in the ranges 0.15 < pT < 2.50 GeV/c and 2.0 < y < 4.5. Results at the two energies are in good agreement as a function of rapidity loss, ∆y = ybeam − y, and are consistent with previous measurements. The ratio , measuring the transport of baryon number from the collision into the detector, is smaller in data than predicted in simulation, particularly at high rapidity. The ratio , measuring the baryon-to-meson suppression in strange quark hadronisation, is significantly larger than expected.
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1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193)
2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain (GRID:grid.11794.3a) (ISNI:0000000109410645)
3 University of Bristol, H.H. Wills Physics Laboratory, Bristol, United Kingdom (GRID:grid.5337.2) (ISNI:0000000419367603)
4 CPPM, Aix-Marseille Université, CNRS/ IN2P3, Marseille, France (GRID:grid.4444.0) (ISNI:0000000121129282)
5 University of Liverpool, Oliver Lodge Laboratory, Liverpool, United Kingdom (GRID:grid.10025.36) (ISNI:0000000419368470)
6 Clermont Université, Université Blaise Pascal, CNRS/ IN2P3, LPC, Clermont-Ferrand, France (GRID:grid.4444.0) (ISNI:0000000121129282)
7 European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
8 CPPM, Aix-Marseille Université, CNRS/ IN2P3, Marseille, France (GRID:grid.4444.0) (ISNI:0000000121129282); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
9 University of Glasgow, School of Physics and Astronomy, Glasgow, United Kingdom (GRID:grid.8756.c) (ISNI:000000012193314X)
10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376)
11 Sezione INFN di Roma La Sapienza, Roma, Italy (GRID:grid.470218.8)
12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil (GRID:grid.8536.8) (ISNI:000000012294473X)
13 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049)
14 Physik-Institut, Universität Zürich, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000000419370650)
15 University of Manchester, School of Physics and Astronomy, Manchester, United Kingdom (GRID:grid.5379.8) (ISNI:0000000121662407)
16 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000000122886103)
17 CC-IN2P3, CNRS/IN2P3, Lyon-Villeurbanne, France (GRID:grid.433124.3) (ISNI:0000000106643574)
18 Institute for High Energy Physics (IHEP), Protvino, Russia (GRID:grid.424823.b) (ISNI:000000040620440X)
19 Syracuse University, Syracuse, United States (GRID:grid.264484.8) (ISNI:0000000121891568); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
20 Sezione INFN di Roma La Sapienza, Roma, Italy (GRID:grid.470218.8); Università della Basilicata, Potenza, Italy (GRID:grid.7367.5) (ISNI:0000000119391302)
21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000000121904373)
22 University of Warwick, Department of Physics, Coventry, United Kingdom (GRID:grid.7372.1) (ISNI:0000000088091613)
23 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia (GRID:grid.21626.31) (ISNI:0000000101258159); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
24 Sezione INFN di Ferrara, Ferrara, Italy (GRID:grid.470200.1) (ISNI:0000000417654414)
25 LAL, Université Paris-Sud, CNRS/ IN2P3, Orsay, France (GRID:grid.4444.0) (ISNI:0000000121129282)
26 University of Cambridge, Cavendish Laboratory, Cambridge, United Kingdom (GRID:grid.5335.0) (ISNI:0000000121885934)
27 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil (GRID:grid.418228.5) (ISNI:0000000406438134)
28 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/ IN2P3, Paris, France (GRID:grid.4444.0) (ISNI:0000000121129282)
29 Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236)
30 University of Edinburgh, School of Physics and Astronomy, Edinburgh, United Kingdom (GRID:grid.4305.2) (ISNI:0000000419367988)
31 Sezione INFN di Firenze, Firenze, Italy (GRID:grid.470204.5); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
32 School of Physics, University College Dublin, Dublin, Ireland (GRID:grid.7886.1) (ISNI:0000000107682743)
33 Sezione INFN di Firenze, Firenze, Italy (GRID:grid.470204.5); Università di Modena e Reggio Emilia, Modena, Italy (GRID:grid.7548.e) (ISNI:0000000121697570)
34 Imperial College London, London, United Kingdom (GRID:grid.7445.2) (ISNI:0000000121138111)
35 Syracuse University, Syracuse, United States (GRID:grid.264484.8) (ISNI:0000000121891568)
36 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia (GRID:grid.418495.5)
37 Sezione INFN di Cagliari, Cagliari, Italy (GRID:grid.470195.e)
38 Technische Universität Dortmund, Fakultät Physik, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000000104169637)
39 Nikhef National Institute for Subatomic Physics and Vrije Universiteit, Amsterdam, Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193)
40 University of Oxford, Department of Physics, Oxford, United Kingdom (GRID:grid.4991.5) (ISNI:0000000419368948)
41 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania (GRID:grid.443874.8) (ISNI:0000000094635349)
42 Sezione INFN di Milano Bicocca, Milano, Italy (GRID:grid.470207.6); Università di Milano Bicocca, Milano, Italy (GRID:grid.7563.7) (ISNI:0000000121741754)
43 Universitat de Barcelona, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000000419370247); LIFAELS, La Salle, Universitat Ramon Llull, Barcelona, Spain (GRID:grid.6162.3) (ISNI:0000000121746723)
44 Universitat de Barcelona, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000000419370247)
45 Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
46 Sezione INFN di Bologna, Bologna, Italy (GRID:grid.470193.8)
47 Sezione INFN di Roma Tor Vergata, Roma, Italy (GRID:grid.470219.9); Università di Roma Tor Vergata, Roma, Italy (GRID:grid.6530.0) (ISNI:0000000123000941)
48 Sezione INFN di Genova, Genova, Italy (GRID:grid.470205.4); Università di Genova, Genova, Italy (GRID:grid.5606.5) (ISNI:0000000121513065)
49 University of Edinburgh, School of Physics and Astronomy, Edinburgh, United Kingdom (GRID:grid.4305.2) (ISNI:0000000419367988); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
50 LAPP, Université de Savoie, CNRS/ IN2P3, Annecy-Le-Vieux, France (GRID:grid.4444.0) (ISNI:0000000121129282)
51 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
52 Sezione INFN di Cagliari, Cagliari, Italy (GRID:grid.470195.e); Università di Cagliari, Cagliari, Italy (GRID:grid.7763.5) (ISNI:0000000417553242)
53 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine (GRID:grid.425540.2) (ISNI:0000000095263153)
54 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom (GRID:grid.76978.37) (ISNI:0000000122966998)
55 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia (GRID:grid.21626.31) (ISNI:0000000101258159)
56 Universitat de Barcelona, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000000419370247); Institució Catalana de Recerca i Estudis Avanccats (ICREA), Barcelona, Spain (GRID:grid.425902.8) (ISNI:000000009601989X)
57 Sezione INFN di Ferrara, Ferrara, Italy (GRID:grid.470200.1) (ISNI:0000000417654414); Università di Ferrara, Ferrara, Italy (GRID:grid.8484.0) (ISNI:0000000417572064)
58 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia (GRID:grid.425051.7) (ISNI:0000000094673767)
59 Sezione INFN di Firenze, Firenze, Italy (GRID:grid.470204.5); Università di Firenze, Firenze, Italy (GRID:grid.8404.8) (ISNI:0000000417572304); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
60 Sezione INFN di Milano Bicocca, Milano, Italy (GRID:grid.470207.6)
61 Sezione INFN di Bologna, Bologna, Italy (GRID:grid.470193.8); Università di Bologna, Bologna, Italy (GRID:grid.6292.f) (ISNI:0000000417571758)
62 Tsinghua University, Center for High Energy Physics, Beijing, China (GRID:grid.12527.33) (ISNI:0000000106623178)
63 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (GRID:grid.4839.6) (ISNI:000000012323852X)
64 Imperial College London, London, United Kingdom (GRID:grid.7445.2) (ISNI:0000000121138111); Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia (GRID:grid.21626.31) (ISNI:0000000101258159); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
65 Sezione INFN di Firenze, Firenze, Italy (GRID:grid.470204.5)
66 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine (GRID:grid.450331.0)
67 Sezione INFN di Milano Bicocca, Milano, Italy (GRID:grid.470207.6); Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000000109428941)
68 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000000109428941)
69 Sezione INFN di Bologna, Bologna, Italy (GRID:grid.470193.8); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
70 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia (GRID:grid.14476.30) (ISNI:0000000123429668); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
71 LAPP, Université de Savoie, CNRS/ IN2P3, Annecy-Le-Vieux, France (GRID:grid.4444.0) (ISNI:0000000121129282); Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia (GRID:grid.21626.31) (ISNI:0000000101258159)
72 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
73 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia (GRID:grid.425051.7) (ISNI:0000000094673767); Sezione INFN di Ferrara, Ferrara, Italy (GRID:grid.470200.1) (ISNI:0000000417654414); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
74 Sezione INFN di Bari, Bari, Italy (GRID:grid.470190.b); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
75 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania (GRID:grid.443874.8) (ISNI:0000000094635349); Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049)
76 Faculty of Physics & Applied Computer Science, Cracow, Poland (GRID:grid.5333.6)
77 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049); Hanoi University of Science, Hanoi, Viet Nam (GRID:grid.267852.c) (ISNI:0000000406372083)
78 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia (GRID:grid.14476.30) (ISNI:0000000123429668)
79 Faculty of Physics & Applied Computer Science, Cracow, Poland (GRID:grid.14476.30)
80 Sezione INFN di Bari, Bari, Italy (GRID:grid.470190.b); Università di Bari, Bari, Italy (GRID:grid.7644.1) (ISNI:0000000101203326)
81 University of Glasgow, School of Physics and Astronomy, Glasgow, United Kingdom (GRID:grid.8756.c) (ISNI:000000012193314X); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
82 Sezione INFN di Roma La Sapienza, Roma, Italy (GRID:grid.470218.8); Università di Roma La Sapienza, Roma, Italy (GRID:grid.7841.a)
83 Sezione INFN di Ferrara, Ferrara, Italy (GRID:grid.470200.1) (ISNI:0000000417654414); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
84 University of Warwick, Department of Physics, Coventry, United Kingdom (GRID:grid.7372.1) (ISNI:0000000088091613); Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia (GRID:grid.418495.5)
85 Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236); Università di Roma La Sapienza, Roma, Italy (GRID:grid.7841.a)
86 Sezione INFN di Roma Tor Vergata, Roma, Italy (GRID:grid.470219.9)
87 Faculty of Physics & Applied Computer Science, Cracow, Poland (GRID:grid.21626.31)
88 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine (GRID:grid.425540.2) (ISNI:0000000095263153); European Organization for Nuclear Research (CERN), Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
89 Soltan Institute for Nuclear Studies, Warsaw, Poland (GRID:grid.450295.f) (ISNI:0000000109410848)
90 University of Oxford, Department of Physics, Oxford, United Kingdom (GRID:grid.4991.5) (ISNI:0000000419368948); STFC Rutherford Appleton Laboratory, Didcot, United Kingdom (GRID:grid.76978.37) (ISNI:0000000122966998)
91 Sezione INFN di Firenze, Firenze, Italy (GRID:grid.470204.5); Università di Urbino, Urbino, Italy (GRID:grid.12711.34) (ISNI:0000000123697670)
92 University of Warwick, Department of Physics, Coventry, United Kingdom (GRID:grid.7372.1) (ISNI:0000000088091613); STFC Rutherford Appleton Laboratory, Didcot, United Kingdom (GRID:grid.76978.37) (ISNI:0000000122966998)
93 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000000122886103); Russian Academy of Science (LPI RAS), P.N. Lebedev Physical Institute, Moscow, Russia (GRID:grid.4886.2) (ISNI:0000000121929124)