Measurement of the mass and lifetime of the Ω<i>_b</i><SUP>-</SUP> baryon

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Bowcock, TJV ORCID: 0000-0002-3505-6915, Bowen, E, Bozzi, C, Braun, S, Britsch, M, Britton, T, Brodzicka, J, Buchanan, E, Burr, C, Bursche, A, Buytaert, J, Cadeddu, S, Calabrese, R, Calvi, M, Gomez, M Calvo, Campana, P, Perez, D Campora, Capriotti, L, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carniti, P, Carson, L, Akiba, K Carvalho, Casse, G ORCID: 0000-0002-8516-237X, Cassina, L, Garcia, L Castillo, Cattaneo, M, Cauet, Ch, Cavallero, G, Cenci, R, Charles, M, Charpentier, Ph, Chatzikonstantinidis, G, Chefdeville, M, Chen, S, Cheung, S-F, Chobanova, V, Chrzaszcz, M, Vidal, X Cid, Ciezarek, G, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coco, V, Cogan, J, Cogneras, E, Cogoni, V, Cojocariu, L, Collazuol, G, Collins, P, Comerma-Montells, A, Contu, A, Cook, A, Coquereau, S, Corti, G, Corvo, M, Couturier, B, Cowan, GA, Craik, DC, Crocombe, A, Torres, M Cruz, Cunliffe, S, Currie, R, D'Ambrosio, C, Dall'Occo, E, Dalseno, J, David, PNY, Davis, A, Francisco, O De Aguiar, De Bruyn, 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Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Kanso, W, Karacson, M, Karbach, TM, Karodia, S, Kecke, M, Kelsey, M, Kenyon, IR, Kenzie, M, Ketel, T, Khairullin, E, Khanji, B, Khurewathanakul, C, Kirn, T, Klaver, S, Klimaszewski, K, Kolpin, M, Komarov, I, Koopman, RF, Koppenburg, P, Kozeiha, M, Kravchuk, L, Kreplin, K, Kreps, M, Krokovny, P, Kruse, F, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kuonen, AK, Kurek, K, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lambert, D, Lanfranchi, G, Langenbruch, C, Langhans, B, Latham, T, Lazzeroni, C, Le Gac, R, van Leerdam, J, Lees, J-P, Lefevre, R, Leflat, A, Lefranois, J, Cid, E Lemos, Leroy, O, Lesiak, T, Leverington, B, Li, Y, Likhomanenko, T, Lindner, R, Linn, C, Lionetto, F, Liu, B, Liu, X, Loh, D, Longstaff, I, Lopes, JH, Lucchesi, D, Martinez, M Lucio, Luo, H, Lupato, A, Luppi, E, Lupton, O, Lusardi, N, Lusiani, A, Lyu, X, Machefert, F, Maciuc, F, Maev, O, Maguire, K, Malde, S, Malinin, A, Manca, G, 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DR, Watson, NK, Websdale, D, Weiden, A, Whitehead, M, Wicht, J, Wilkinson, G, Wilkinson, M, Williams, M, Williams, MP, Williams, M, Williams, T, Wilson, FF, Wimberley, J, Wishahi, J, Wislicki, W, Witek, M, Wormser, G, Wotton, SA, Wraight, K, Wright, S, Wyllie, K, Xie, Y, Xu, Z, Yang, Z, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zangoli, M, Zavertyaev, M, Zhang, L, Zhang, Y, Zhelezov, A, Zheng, Y, Zhokhov, A, Zhong, L, Zhukov, V and Zucchelli, S (2016) Measurement of the mass and lifetime of the Ω<i>_b</i><SUP>-</SUP> baryon. PHYSICAL REVIEW D, 93 (9). 092007-.

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Abstract

A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $\Omega_b^-\to\Omega_c^0\pi^-$, $\Omega_c^0\to pK^-K^-\pi^+$ decays. Using the $\Xi_b^-\to\Xi_c^0\pi^-$, $\Xi_c^0\to pK^-K^-\pi^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $\Omega_b^-$ baryon are measured to be \begin{align*} \frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\ \tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $\tau_{\Omega_b^-}$ only). A measurement is also made of the mass difference, $m_{\Omega_b^-}-m_{\Xi_b^-}$, and the corresponding $\Omega_b^-$ mass, which yields \begin{align*} m_{\Omega_b^-}-m_{\Xi_b^-} &= 247.4\pm3.2\pm0.5~{\rm MeV}/c^2, \\ m_{\Omega_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2. \end{align*} These results are consistent with previous measurements.

Item Type:	Article
Additional Information:	11 pages, 5 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-008.html
Uncontrolled Keywords:	hep-ex, hep-ex
Depositing User:	Symplectic Admin
Date Deposited:	07 Jun 2016 11:02
Last Modified:	17 Oct 2023 01:03
DOI:	10.1103/PhysRevD.93.092007
Open Access URL:	http://arxiv.org/abs/1604.01412
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3001568