Observation of multiplicity-dependent prompt $\chi_{c1}(3872)$ and $\psi(2S)$ production in $pp$ collisions
2021
- Roel Aaij
- Diego Torres Machado
- Matthew John Bradley
- Gregory Ciezarek
- Maciej Wojciech Dudek
- Paula Collins
- Steffen Georg Weber
- Wenbin Qian
- Halime Sazak
- Achim Vollhardt
- Valery Zhukov
- Simone Meloni
- Alessio Piucci
- Jennifer Clare Smallwood
- Serena Maccolini
- Lakshan Ram Madhan Mohan
- Marcel Merk
- Paula Garcia Moreno
- Konstantin Gizdov
- Marie-Noelle Minard
- Daniel Berninghoff
- Pavel Krokovny
- Gianfranco Morello
- Andrea Merli
- Tamaki Holly Mcgrath
- Thi Dung Nguyen
- Carmen Giugliano
- Ryan Newcombe
- Guillaume Pietrzyk
- Paul Nathaniel Swallow
- Leonid Kravchuk
- Tatiana Ovsiannikova
- Mikkel Bjørn
- Menglin Xu
- Yutong Li
- Ivan Polyakov
- Veronika Chobanova
- Thomas Kirn
- Kara Renee Mattioli
- Matteo Palutan
- Luke George Scantlebury Smead
- Niels Tuning
- Adam Dendek
- Mauro Piccini
- Sebastian Bachmann
- Marie Bachmayer
- Zhenzi Wang
- Carina Trippl
- Kazuyoshi Carvalho Akiba
- Timothy Evans
- Giovanni Punzi
- Da Yu Tou
- Neville Harnew
- Stephan Escher
- Fionn Caitlin Ros Bishop
- Marcin Chrząszcz
- Vukan Jevtic
- Sune Jakobsen
- Stefano Perazzini
- Guido Haefeli
- Sheldon Stone
- Marek Idzik
- Jennifer Brigitta Zonneveld
- Guanghua Gong
- Florin Maciuc
- Tomasz Szumlak
- Marcel Materok
- Davide Pinci
- Miriam Lucio Martinez
- Hangyi Wu
- Yangheng Zheng
- Daniel Patrick OHanlon
- Daria Strekalina
- Jeremy Dalseno
- Roland Waldi
- Sergei V. Popov
- Nikolay Nikitin
- Sara Elizabeth Mitchell
- Vladimir Chulikov
- Louis Lenard Gerken
- Michele Atzeni
- Sascha Stahl
- Sebastian Neubert
- Artur Ishteev
- Christopher Jones
- Robbert Erik Geertsema
- Mikhail Zavertyaev
- Eluned Smith
- Tai-Hua Lin
- Margarete Schellenberg
- Anna Danilina
- Jascha Peter Grabowski
- Jan-Marc Basels
- Matthew Needham
- Burkhard Schmidt
- Domenico Galli
- Christoph Hasse
- Thomas Ackernley
- Tabitha Halewood-Leagas
- Cheryl Pappenheimer
- Ivan Belyaev
- Aleksandr Petrov
- Edward Brendan Shields
- Hongxi Xing
- Stefano Petrucci
- Hanna Malygina
- Patricia Camargo Magalhães
- Hengne Li
- Bhagyashree Pagare
- Claudia Bertella
- Luis Miguel Garcia Martin
- Alessandra Gioventù
- Paul Andre Günther
- Agostinho Gomes
- Giacomo Vitali
- Matthew Kenzie
- Holger Stevens
- Denis Derkach
- Malte Hecker
- Angelo Carbone
- Olivier Deschamps
- Baasansuren Batsukh
- Alexey Boldyrev
- Katharina Müller
- Philipp Roloff
- Massimiliano Fiorini
- Patrick Spradlin
- Michael Brodski
- Liupan An
- Youhua Yang
- Konstantin Belous
- Alex Pearce
- Rudolf Oldeman
- Michal Dziewiecki
- Frederic Blanc
- Alessandro Camboni
- Ilaria Neri
- Shanzhen Chen
- Zan Ren
- Florian Reiss
- Lingzhu Bian
- Michael Sokoloff
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- Jaap Velthuis
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- Eva Vilella Figueras
- M. Rama
- Elisabeth Maria Niel
- Serhii Koliiev
- V. Obraztsov
- Jialu Wang
- Sergii Kandybei
- Nigel Watson
- Jussara De Miranda
- Michael Schmelling
- Bernhard Spaan
- Vinicius Franco Lima
- Ricardo Graciani Diaz
- George Lafferty
- Maciej Pawel Szymanski
- Chishuai Wang
- Kristof De Bruyn
- George Holger Lovell
- Harris Conan Bernstein
- Gary Robertson
- Lucia Grillo
- Juan Martin Otalora Goicochea
- Lavinia-Helena Giubega
- Jozef Tomasz Borsuk
- Vadym Denysenko
- Rosa Anna Fini
- David Anthony Friday
- Heather Mckenzie Wark
- Dana Bobulska
- Dylan James White
- Stephanie Hansmann-Menzemer
- Loris Martinazzoli
- Philippe Ghez
- A. Alfonso Albero
- Minh Tâm Tran
- Laura Promberger
- Mark Richard James Williams
- Jifeng Hu
- Michela Garau
- Marek Jezabek
- Nis Meinert
- Raúl Iraq Rabadán-Trejo
- Naomi Veronika Raab
- I.V. Gorelov
- Jana Crkovska
- Frederic Fleuret
- Lauren Emma Yeomans
- Richard Lane
- Phillip John Marshall
- Sergey Legotin
- Benedetto Gianluca Siddi
- Annarita Buonaura
- Vladimir Romanovskiy
- Eric Thomas
- Beat Jost
- Jia-Jia Qin
- Olivier Leroy
- Guillermo Loustau
- Sook Hyun Lee
- Edward James Millard
- Elena Graverini
- Preema Rennee Pais
- Beatriz Garcia Plana
- Tomasz Fiutowski
- Anatoly Butkevich
- Donal Hill
- Rosen Matev
- Iaroslava Bezshyiko
- Carlos Sanchez Mayordomo
- Daniel Lacarrere
- Valerie Gibson
- Niladribihari Sahoo
- Paolo Carniti
- Raja Nandakumar
- Rafael Silva Coutinho
The production of $\chi_{c1}(3872)$ and $\psi(2S)$ hadrons is studied as a function of charged particle multiplicity in $pp$ collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb$^{-1}$. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of $\chi_{c1}(3872)$ to $\psi(2S)$ cross-sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in $b$-hadron decays. Comparisons with model calculations and implications for the binding energy of the $\chi_{c1}(3872)$ state are discussed.
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