# First observation of the decay Bc+ to J/psi pi+pi-pi+

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D. Wiedner, Jul 03, 2015 Available from:- [Show abstract] [Hide abstract]

**ABSTRACT:**During 2011 the LHCb experiment at CERN collected 1.0 fb-1 of sqrt{s} = 7 TeV pp collisions. Due to the large heavy quark production cross-sections, these data provide unprecedented samples of heavy flavoured hadrons. The first results from LHCb have made a significant impact on the flavour physics landscape and have definitively proved the concept of a dedicated experiment in the forward region at a hadron collider. This document discusses the implications of these first measurements on classes of extensions to the Standard Model, bearing in mind the interplay with the results of searches for on-shell production of new particles at ATLAS and CMS. The physics potential of an upgrade to the LHCb detector, which would allow an order of magnitude more data to be collected, is emphasised.European Physical Journal C 08/2012; 73(2013):2373. DOI:10.1140/epjc/s10052-013-2373-2 · 5.44 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We present a review of the operation and of the most recent results from the LHCb experiment at the LHC collider, based on the analyses performed using the data collected in 2010 and 2011, which correspond to an integrated luminosity of 1 fb-1. These measurements set stringent new limits on the contributions of New Physics processes in the field of rare b decays, and in the search for CP violation in B0 and B0s mesons decays. In addition, a summary of results from studies of CP violation in the charm sector are presented, together with measurements in quarkonia production, in spectroscopy, in electroweak physics and in searches for exotica. The planned upgrade of LHCb is also briefly discussed.Modern Physics Letters A 09/2012; 27(30):30031-. DOI:10.1142/S0217732312300315 · 1.34 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**In this paper, the branching ratios of $B_c$ decays to S-wave charmonia along with light mesons including $\pi$, $\rho$, $k$ and $k^*$ up to twist-3 light-cone distribution amplitudes at next-to-leading order (NLO) are performed both in non-relativistic QCD and in light-cone QCD framework. Renormalization scale dependence for the decay widths is obviously depressed at NLO correction, hence the theoretic uncertainty is correspondingly reduced. Numerical results show that NLO QCD corrections markedly enhanced the branching ratios with a K factor of 1.75 for $B_{c}^{\pm}\to \eta_{c} \pi^{\pm}$ and 1.31 for $B_{c}^{\pm}\to J/\Psi \pi^{\pm}$, which can now be checked in the LHCb experiment. Besides, in the heavy quark limit $m_b \to \infty$, the factorization is shown to hold at two scenarios: non-relativistic (NR) factorization scheme and light-cone (LC) factorization scheme. We note that the annihilation diagrams contribute trivia in this limit, and the leading order contribution in $z= m_c/m_b$ expansion comes from form factors and hard spectator interactions. Analytic investigations ensure that the comparison for the processes within7 between $\mathrm{NRQCD}\otimes \mathrm{NRQCD} \otimes \mathrm{SCET}$ and $\mathrm{SCET}\otimes \mathrm{SCET}\otimes \mathrm{SCET}$ is more clear. At last, some related phenomenologies are also discussed.Physical Review D 09/2012; 89(3). DOI:10.1103/PhysRevD.89.034008 · 4.86 Impact Factor