Study of the doubly charmed tetraquark $T_{cc}^+$

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collaboration, LHCb, Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellán, Gallego, FJ Abudinen, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C et al (show 999 more authors) , Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Albero, A Alfonso, Aliouche, Z, Alkhazov, G, Cartelle, P Alvarez, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Rodriguez, P Baladron, Balagura, V, Baldini, W, Leite, J Baptista, Barbetti, M, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, JM, Bashir, S, Bassi, G, Batsukh, B, Battig, A, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Belavin, V, Belin, S, Bellee, V, Belous, K, Belov, I, Belyaev, I, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Berninghoff, D, Bernstein, HC, Bertella, C, Bertolin, A, Betancourt, C, 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D, Weisser, C, Westhenry, BDC, White, DJ, Whitehead, M, Wiederhold, AR, Wiedner, D, Wilkinson, G, Wilkinson, M, Williams, I, Williams, M, Williams, MRJ, Wilson, FF, Wislicki, W, Witek, M, Witola, L, Wormser, G, Wotton, SA, Wu, H, Wyllie, K, Xiang, Z, Xiao, D, Xie, Y, Xu, A, Xu, J, Xu, L, Xu, M, Xu, Q, Xu, Z, Xu, Z, Yang, D, Yang, S, Yang, Y, Yang, Z, Yang, Z, Yao, Y, Yeomans, LE, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zaffaroni, E, Zavertyaev, M, Zdybal, M, Zenaiev, O, Zeng, M, Zhang, D, Zhang, L, Zhang, S, Zhang, S, Zhang, Y, Zhang, Y, Zharkova, A, Zhelezov, A, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, X, Zhu, X, Zhu, Z, Zhukov, V, Zonneveld, JB, Zou, Q, Zucchelli, S, Zuliani, D and Zunica, G (2021) Study of the doubly charmed tetraquark $T_{cc}^+$. [Preprint]

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Abstract

An exotic narrow state in the $D^0D^0\pi^+$ mass spectrum just below the $D^{*+}D^0$ mass threshold is studied using a data set corresponding to an integrated luminosity of 9 fb$^{-1}$ acquired with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The state is consistent with the ground isoscalar $T^+_{cc}$ tetraquark with a quark content of $cc\bar{u}\bar{d}$ and spin-parity quantum numbers $\mathrm{J}^{\mathrm{P}}=1^+$. Study of the $DD$ mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell $D^{*+}$ mesons is confirmed by the $D^0\pi^+$ mass distribution. The mass of the resonance and its coupling to the $D^{*}D$ system are analysed. Resonance parameters including the pole position, scattering length, effective range and compositeness are measured to reveal important information about the nature of the $T^+_{cc}$ state. In addition, an unexpected dependence of the production rate on track multiplicity is observed.

Item Type:	Preprint
Additional Information:	All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-032.html
Uncontrolled Keywords:	hep-ex, hep-ex
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	17 Jan 2022 09:14
Last Modified:	15 Mar 2024 04:37
DOI:	10.48550/arxiv.2109.01056
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3146842