Observation of a new $\Xi_b^0$ state
2020
- Roel Aaij
- Diego Torres Machado
- Matthew John Bradley
- Gregory Ciezarek
- Maciej Wojciech Dudek
- Paula Collins
- Steffen Georg Weber
- Wenbin Qian
- Halime Sazak
- Achim Vollhardt
- 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
- Alexandre Boyer
- Sune Jakobsen
- Stefano Perazzini
- Guido Haefeli
- Sheldon Stone
- Marek Idzik
- Jennifer Brigitta Zonneveld
- G Gong
- Florin Maciuc
- Tomasz Szumlak
- Marcel Materok
- Davide Pinci
- Miriam Lucio Martinez
- Hangyi Wu
- Yangheng Zheng
- Daniel Patrick OHanlon
- Daria Strekalina
- Giacomo Graziani
- Roland Waldi
- Sergei 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
- Stefano Petrucci
- Hanna Malygina
- Patricia Camargo Magalhães
- Hengne Li
- Bhagyashree Pagare
- Claudia Bertella
- Luis Miguel Garcia Martin
- Alessandra Gioventù
- Paul Andre Günther
- Alvaro 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
- Y. Y. Yang
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- Alex Pearce
- Rudolf Oldeman
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- Vladimir Gligorov
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- Chishuai Wang
- Kristof De Bruyn
- George Holger Lovell
- Harris Conan Bernstein
- Gary Robertson
- Lucia Grillo
- Juan Martin Otalora Goicochea
- Lavinia-Helena Giubega
- Marko Milovanovic
- Jozef Tomasz Borsuk
- Vadym Denysenko
- Rosa Anna Fini
- David Anthony Friday
- Heather Mckenzie Wark
- Dana Bobulska
- Stephanie Hansmann-Menzemer
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- Minh Tâm Tran
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- Jifeng Hu
- Michela Garau
- Marek Jezabek
- Nis Meinert
- Raúl Iraq Rabadán-Trejo
- Naomi Veronika Raab
- Igor Vladimirovich Gorelov
- Jana Crkovska
- Frederic Fleuret
- Lauren Emma Yeomans
- R. 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 Lee
- Edward James Millard
- Elena Graverini
- Vukan Jevtic
- Beatriz Garcia Plana
- Tomasz Fiutowski
- Anatoly Butkevich
- Donal Hill
- Rosen Matev
- Iaroslava Bezshyiko
- Daniel Lacarrere
- Valerie Gibson
- Niladribihari Sahoo
- Paolo Carniti
- Raja Nandakumar
- Rafael Silva Coutinho
Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $\Xi_b^0$ resonance decaying to the $\Xi_b^-\pi^+$ final state is presented. The state, referred to as $\Xi_b(6227)^0$, has a measured mass and natural width of $m(\Xi_b(6227)^0) = 6227.1^{\,+1.4}_{\,-1.5}\pm0.5$ MeV, $\Gamma(\Xi_b(6227)^0) = 18.6^{\,+5.0}_{\,-4.1}\pm1.4$ MeV, where the uncertainties are statistical and systematic. The production rate of the $\Xi_b(6227)^0$ state relative to that of the $\Xi_b^-$ baryon in the kinematic region $2<\eta<5$ and $p_{\rm T}<30$ GeV is measured to be $\frac{f_{\Xi_b(6227)^0}}{f_{\Xi_b^-}}{\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+) = 0.045\pm0.008\pm0.004$, where ${\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+)$ is the branching fraction of the decay, and $f_{\Xi_b(6227)^0}$ and $f_{\Xi_b^-}$ represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed $\Xi_b(6227)^-$ state, along with the mass of the $\Xi_b^-$ baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.
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