1. Measurement of $$\Lambda $$(1520) production in pp collisions at $$\sqrt{s} = 7\ \hbox {TeV}$$ and p–Pb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02\ \hbox {TeV}$$
- Author
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Fabio Catalano, Norbert Novitzky, Barbara Trzeciak, Marek Bombara, Yvonne Pachmayer, Toru Sugitate, Souvik Priyam Adhya, Subhasis Chattopadhyay, Janka Vrlakova, Prabhakar Palni, Yaroslav Berdnikov, Christoph Blume, Eberhard Widmann, Jussi Viinikainen, Alexandre Suaide, Anar Rustamov, Uliana Dmitrieva, Dr. Biswarup Paul, Salvatore De Pasquale, Jamila Butt, Masanori Ogino, Ketil Røed, Sumit Basu, Mirko Planinic, James Philip Iddon, Ashim Roy, Janusz Oleniacz, Yue Shi Lai, Tome Anticic, Davide Pagano, Smbat Grigoryan, Sergey Nikolaev, Claude Pruneau, Leticia Cunqueiro, Borge S Nielsen, Francesca Carnesecchi, Gergely Gábor Barnaföldi, Ramona Lea, Jens-Jorgen Gaardhoje, Mais Suleymanov, Alexander Akindinov, Igor Pshenichnov, Marco Toppi, Krzysztof Redlich, Thomas Peitzmann, Leo Greiner, Kristjan Gulbrandsen, Ranjit Nayak, Francesca Bellini, Vladimir Kovalenko, Pietro Fecchio, Dmitry Serebryakov, Mohd Danish Azmi, Tiziano Virgili, ALEXANDER BOLOZDYNYA, Federico Ronchetti, Victor Riabov, Kai Schweda, Simone Ragoni, Petra Loncar, Jan Figiel, Adrian Sevcenco, Francesca Soramel, Piotr Konopka, Thomas Dietel, Timo Hilden, Vladimir Vechernin, Daniel Dąbrowski, Lukas Nellen, Mattia Faggin, Paula Fernanda Toledo Matuoka, Nikola Poljak, Rutuparna Rath, Ayben Karasu Uysal, Wladyslaw Henryk Trzaska, Vladyslav Litichevskyi, Syaefudin Jaelani, Raimond Snellings, Markus Keil, Nirbhay Kumar Behera, Rafael Peretti Pezzi, Vladimir Zherebchevsky, Mikael Mieskolainen, Rashmi Raniwala, Chinorat Kobdaj, Luciano Ramello, Susanna COSTANZA, Marielle Chartier, Sergey Fokin, Samrangy Sadhu, Roberto Barbera, Andrey Erokhin, Nicolò Jacazio, Sami Räsänen, Daniele De Gruttola, Sandro Christian Wenzel, Marco Van Leeuwen, David Chinellato, Dmitry Blau, Somnath Kar, Luca Barioglio, Federico Cindolo, Elisa Meninno, Gabriele Fiorenza, Adam Kisiel, Grigory Feofilov, You Zhou, In-Kwon Yoo, Jun Takahashi, Sandra Moretto, Serpil Yalcin Kuzu, Lucas Altenkämper, Piotr Nowakowski, Paolo Camerini, Domenico Colella, Daniele Pistone, Lidia Goerlich, Alberto Martín Gago Medina, Otwinowski Jacek, Chiara Pinto, Jose Luis Bazo Alba, Mikhail Zhalov, Cesar Ceballos, Michael Weber, Kenta Shigaki, Fernando Antonio Flor, Matthew Buckland, Chiara Oppedisano, Adela Kravcakova, Marcello Borri, Marcello Lunardon, Sebastian Bysiak, Giuseppe Mandaglio, and Francesco Prino
- Subjects
Physics ,Particle physics ,Large Hadron Collider ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Hadron ,Hyperon ,Lambda ,01 natural sciences ,Baryon ,0103 physical sciences ,Quark–gluon plasma ,Multiplicity (chemistry) ,010306 general physics ,Ground state ,Engineering (miscellaneous) - Abstract
The production of the $$\Lambda $$Λ(1520) baryonic resonance has been measured at midrapidity in inelastic pp collisions at $$\sqrt{s} = 7\ \hbox {TeV}$$s=7TeV and in p–Pb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02\ \hbox {TeV}$$sNN=5.02TeV for non-single diffractive events and in multiplicity classes. The resonance is reconstructed through its hadronic decay channel $$\Lambda $$Λ(1520) $$\rightarrow \hbox {pK}^{-}$$→pK- and the charge conjugate with the ALICE detector. The integrated yields and mean transverse momenta are calculated from the measured transverse momentum distributions in pp and p–Pb collisions. The mean transverse momenta follow mass ordering as previously observed for other hyperons in the same collision systems. A Blast-Wave function constrained by other light hadrons ($$\pi $$π, K, $$\hbox {K}_{\mathrm{S}}^0$$KS0, p, $$\Lambda $$Λ) describes the shape of the $$\Lambda $$Λ(1520) transverse momentum distribution up to $$3.5\ \hbox {GeV}/c$$3.5GeV/c in p–Pb collisions. In the framework of this model, this observation suggests that the $$\Lambda $$Λ(1520) resonance participates in the same collective radial flow as other light hadrons. The ratio of the yield of $$\Lambda (1520)$$Λ(1520) to the yield of the ground state particle $$\Lambda $$Λ remains constant as a function of charged-particle multiplicity, suggesting that there is no net effect of the hadronic phase in p–Pb collisions on the $$\Lambda $$Λ(1520) yield.
- Published
- 2020