Multiplicity-dependent enhancement of strange and multi-strange hadron production in proton-proton collisions at $\sqrt{s} = 7$ TeV
2016
- Jaroslav Adam
- Jovan Milosevic
- G. Biro
- Edmundo Javier Garcia-solis
- Ernesto Calvo Villar
- R. Majka
- S. G. Weber
- Marco Bregant
- Massimiliano Marchisone
- Pierre Vande Vyvre
- K. L. Graham
- P. Gasik
- M. Planinic
- E. Bartsch
- Mario Fusco Girard
- F. Soramel
- A. Rachevski
- T. Alt
- Rashmi Raniwala
- Henrik Qvigstad
- F. Meddi
- Claudiu Cornel Schiaua
- Greeshma Koyithatta Meethaleveedu
- L. Šándor
- R Jefferson Porter
- Xiaoming Zhang
- Christian Claude Kuhn
- C. Kouzinopoulos
- Guy Paic
- R. Preghenella
- Christian Holm Christensen
- E. G. Ferreiro
- Pascal Dupieux
- Mikolaj Krzewicki
- C. Deplano
- J. Wilkinson
- A. Caliva
- M. Lupi
- Minwoo Kim
- Ketil Roeed
- L. Aphecetche
- J. Bartke
- E. F. Gauger
- Chiara Oppedisano
- S. Gotovac
- P. W. Stankus
- H. M. Ljunggren
- Zaida Conesa Del Valle
- V. Kovalenko
- S. Sahoo
- Yosuke Watanabe
- Yasser Corrales Morales
- Ernst Hellbar
- Federico Cindolo
- Janusz Oleniacz
- G. Simatovic
- V. Petrov
- Zabulon Vilakazi
- S. Bjelogrlic
- Alexander Vodopyanov
- Victor Jose Gaston Feuillard
- A. Nedosekin
- Catia Petta
- Maria Nicassio
- Dmitry Budnikov
- Giovanna Puddu
- Pietro Antonioli
- D. Adamová
- N. Mohammadi
- Mikhail Malaev
- Sidharth Kumar Prasad
- W. Riegler
- S. Trogolo
- Ulrich Michael Frankenfeld
- R. Arnaldi
- D. Silvermyr
- J. Bhom
- Andrei Ionut Herghelegiu
- P. Luettig
- S. K. Oh
- F. Lehas
- C. Ristea
- Radiy Ilkaev
- S. Jena
- Astrid Morreale
- Nicole Bastid
- S. Bagnasco
- P. Dhankher
- K. Ullaland
- Yury Sibiryak
- Antonio Carlos Oliveira Da Silva
- A. Pop
- Rinaldo Rui
- Z. Ahammed
- Dong Jo Kim
- M. Puccio
- T. W. Snellman
- J. Pan
- Daniel Berenyi
- N. Hussain
- S. Kiselev
- Zhang Chunhui
- D. Hutter
- S. De
- Jin Hee Yoon
- Se Yong Kim
- Malgorzata Anna Janik
- B. Cheynis
- S. Balasubramanian
- X. Peng
- P. Sarma
- Jean-Luc Fernand Charvet
- Yong Wook Baek
- Sanjeev Singh Sambyal
- R. A. Ricci
- Jorn Henning Putschke
- Leticia Cunqueiro Mendez
- Alberica Toia
- S. Gorbunov
- V. Barret
- M. Song
- A. S. Gonzalez
- M. Colocci
- R. Langoy
- Ralf Keidel
- A. Grigoryan
- M. Suljic
- Oeystein Djuvsland
- Trine Spedstad Tveter
- J. Wikne
- B. Batyunya
- Raffaele Grosso
- M. Leoncino
- A. Chauvin
- A. M. Kubera
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- L. Musa
- Jiri Mares
- Boris Hippolyte
- G. Batigne
- S. Kar
- Florian Herrmann
- Enrichetta Maria Fiore
- M. Kofarago
- A. Passfeld
- Andrey Reshetin
- F. Antinori
- R. Haake
- P. Lévai
- Benedetto Di Ruzza
- Laurent Ducroux
- M. Sharma
- K. Terasaki
- Jiyoung Kim
- Jasper Van Der Maarel
- Edith Zinhle Buthelezi
- R. Sultanov
- Sandra Moretto
- Audrey Francisco
- Eugenio Scapparone
- Marek Bombara
- C. Cheshkov
- Kai Oliver Schweda
- V. Yurchenko
- Gergely Gabor Barnafoldi
- Y. Kwon
- Jinsook Kim
- Annalisa Mastroserio
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- Eulogio Serradilla Rodriguez
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- S. Arcelli
- Andre Augustinus
- Costin Grigoras
- M. Płoskoń
- Ayben Karasu Uysal
- L. Molnar
- Alis Rodriguez Manso
- Abraham Villatoro Tello
- Domenico Colella
- Camila De Conti
- Dmitry Yurevich Peresunko
- Marielle Chartier
- A. Rybicki
- Lukas Nellen
- S. Muhuri
The yields of strange (${\rm K}^{0}_{S}$, $\Lambda$, $\bar{\Lambda}$) and multi-strange ($\Xi^{-}$, $\bar{\Xi}^{+}$, $\Omega^{-}$, $\bar{\Omega}^{+}$) hadrons are measured at midrapidity in proton-proton (pp) collisions at $\sqrt{s}$ = 7 TeV as a function of the charged-particle multiplicity density (${\rm d}N_{\rm ch}/{\rm d}\eta$).The production rate of strange particles increases faster than that of non-strange hadrons, leading to an enhancement of strange particles relative to pions, similar to that found in nucleus-nucleus collisions as well as in proton-nucleus collisions at the LHC. This is the first observation of an enhanced production of strange particles in high-multiplicity pp collisions. The magnitude of this strangeness enhancement increases with the event activity, quantified by ${\rm d}N_{\rm ch}/{\rm d}\eta$, and with hadron strangeness. It reaches almost a factor of two for the $\Omega$ at the highest multiplicity presented. No enhancement is observed for particles with no strange quark content, demonstrating that the observed effect is strangeness rather than mass related. The results are not reproduced by any of the Monte Carlo models commonly used at the LHC, suggesting that further developments are needed for a complete microscopic understanding of strangeness production and indicating the presence of a phenomenon novel in high-multiplicity pp collisions.
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