Prospects for the B c studies at LHCb

Gouz, I.; Kiselev, V. V.; Likhoded, A. K.; Romanovsky, V.; Yushchenko, O.

doi:10.1134/1.1788046

Cited by 137 publications

(163 citation statements)

References 48 publications

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“…Our branching ratios for both b and c induced decays listed in Table VI are generally close to the other quark model results [7,8,9,14,26] but differ substantially from the ones obtained by Refs. [5,10,40].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Although the phase space of the c → s, d transitions is much smaller than the phase space of the b → c, u transitions, the Cabibbo-KobayashiMaskawa(CKM) matrix elements are greatly in favor of the c quark decay, i.e.|V cb | << |V cs |. In fact, the c-quark decays provide about ∼ 70% of the B c decay width while the b-quark decays and the weak annihilation yield about 20% and 10%, respectively [5]. This indicates that both b-and c-quark decay processes contribute to the B c decay width on a comparable footing.…”

Section: Introductionmentioning

confidence: 99%

“…We shall use the form factors for semileptonic B c → (D (s) , η c , B (s) ) decays as well as the meson decay constants obtained in our LFQM [43,48] as input parameters for the nonleptonic B c decays. As done by many others [5,6,7,8,9,10,11,12,13,14], we consider only the contribution of current-current operators at the tree level and calculate the decay widths for various nonleptonic B c decays. As far as the decay width is concerned, the contribution from the tree diagram is much larger than that from the penguin diagram.…”

Section: Introductionmentioning

confidence: 99%

“…There have been many theoretical efforts to calculate the semileptonic [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] and non-leptonic [4,5,6,7,8,9,10,11,12,13,14,15,16,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42] decays of the B c meson. The semileptonic B c decays provide a good opportunity to measure not only the CKM elements such as |V cb |, |V ub |,|V cs | and |V cd ...…”

Section: Introductionmentioning

confidence: 99%

“…Recently the CDF and D0 Collaborations announced some new measurements of the B c meson lifetime and mass [2,3], τ Bc = 0.463 +0.073 −0.065 (stat) ± 0.036(syst) ps [2], M Bc = 6275.6 ± 2.9(stat)±2.5(syst) MeV [2], and 6300±14(stat)±5(syst) MeV [3]. The LHC is expected to produce around ∼ 5 × 10 10 B c events per year [4,5]. This will provide more detailed information on the decay properties of the B c meson.…”

Section: Introductionmentioning

confidence: 99%

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Nonleptonic two-body decays of theBcmeson in the light-front quark model and the QCD factorization approach

Choi

2009

Phys. Rev. D

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We study exclusive nonleptonic two-body Bc → (D (s) , ηc, B (s) )+F decays with F (pseudoscalar or vector meson) factored out in the QCD factorization approach. The nonleptonic decay amplitudes are related to the product of meson decay constants and the form factors for semileptonic Bc decays. As inputs in obtaining the branching ratios for a large set of nonleptonic Bc decays, we use the weak form factors for the semileptonic Bc → (D (s) , ηc, B (s) ) decays in the whole kinematical region and the unmeasured meson decay constants obtained from our previous light-front quark model. We compare our results for the branching ratios with those of other theoretical studies.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonleptonic two-body decays of theBcmeson in the light-front quark model and the QCD factorization approach

Choi

2009

Phys. Rev. D

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Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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Measurement of the ratio of the production cross sections times branching fractions of B c ± → J/ψπ ± and B± → J/ψK ± and ℬ B c ± → J / ψ π ± π ± π ∓ / ℬ B c ± → J / ψ π ± $$ \mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm }{\pi}^{\pm }{\pi}^{\mp}\right)/\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm}\right) $$ in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV

Khachatryan¹,

Erbacher²,

Montoya³

et al. 2015

J. High Energ. Phys.

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The ratio of the production cross sections times branching fractions σ(B ± c )B(B ± c → J/ψπ ± ) / σ(B ± )B(B ± → J/ψK ± ) is studied in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B ± c and B ± mesons with transverse momentum p T > 15 GeV and rapidity |y| < 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb −1 . The ratio is determined to be [0.48 ± 0.05 (stat) ± 0.03 (syst) ± 0.05 (τ B c )]%. The B ± c → J/ψπ ± π ± π ∓ decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B ± c → J/ψπ ± π ± π ∓ )/B(B ± c → J/ψπ ± ) is measured to be 2.55 ± 0.80 (stat) ± 0.33 (syst) +0.04 −0.01 (τ B c ), consistent with the previous LHCb result.

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Prospects for the B c studies at LHCb

Cited by 137 publications

References 48 publications

Nonleptonic two-body decays of theBcmeson in the light-front quark model and the QCD factorization approach

Nonleptonic two-body decays of theBcmeson in the light-front quark model and the QCD factorization approach

Heavy quarkonium: progress, puzzles, and opportunities

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