Muon pair production in radiative decays of heavy quarkonia

The 2S B c states observed by ATLAS, CMS and LHCb Collaborations are discussed. The observation perspectives of B * c , 2P wave, 3P wave and D wave states of B c at LHC experiments are estimated. INTRODUCTIONB c -meson is a nonrelativistic two heavy quark system, and like (bb) and (cc) states can be considered in the potential model framework that predicts 19 bounded states (bc) below the decay threshold to BD (see [1][2][3][4]). Unlike (bb)or (cc)-quarkonium, there are no annihilation decay modes for these states, which makes the (bc) system similar to usual bq or cq-meson. The first observation of the ground state B c -meson was done at Tevatron collider (CDF and D0 experiments) in two decay modes: B c → Jψlν (l = e, µ) and B c → Jψπ [5-8]. Now this discovery is repeatedly confirmed by the LHC Collaborations LHCb, CMS, ATLAS in numeral decay modes: B c → Jψπ [9-11], B c → Jψπππ [10, 12], B c → J/ψlν [13], B c → J/ψK [14], B c → ψ(2S)π [15], B c → J/ψπKK [16], B c → JψD ( * ) K ( * ) [17, 18], B c → J/ψD ( * ) s [19, 20], B c → J/ψπpp [21], B c → J/ψ3π + 2π − [22] and B c → B s π + [23]. It is worth to note that most of these decays occur due to transformation b → cW . The only observed mode with c quark decay is B c → B s π + . The annihilation channel is not observed yet. It is interesting to note that according to theoretical predictions the dominant decay channel is c → sW , the contribution of b → cW is smaller, and the smallest contribution is *

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“…The branching fraction of lepton pair production in radiative decays of the excited B c meson B 1 → B 2 can be written in the form [68,69] dBr…”

Section: Lepton Pair Production In Radiative B C Meson Decaysmentioning

confidence: 99%

B_c excitations at LHC experiments

Berezhnoy¹,

Belov²,

Лиходед

et al. 2019

Mod. Phys. Lett. A

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“…In Ref. [17], the same processions are calculated with a relation between dilepton decays and radiative decays.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Study of the dilepton electromagnetic decays of $$\chi _{cJ}(1P)$$

et al. 2019

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In this paper, the dilepton electromagnetic decays χ cJ (1P ) → J/ψe + e − and χ cJ (1P ) →c1 and χ c2 , are calculated systematically in the improved Bethe-Salpeter method. The numerical results of decay widths and the invariant mass distributions of the final lepton pairs are given. The comparison is made with the recently measured experimental data of BESIII. It is shown that for the cases including e + e − , the gauge invariance is decisive and should be considered carefully. For the processes of χ cJ (1P ) → J/ψe + e − , the branching fraction are: B[χ c0 (1P ) → J/ψe + e − ] = 1.06 +0.16 −0.18 × 10 −4 , B[χ c1 (1P ) → J/ψe + e − ] = 2.88 +0.50 −0.53 × 10 −3 , and B[χ c2 (1P ) → J/ψe + e − ] = 1.74 +0.22 −0.21 × 10 −3 . The calculated branching fractions of χ cJ (1P ) → J/ψµ + µ − channels are: B[χ c0 (1P ) → J/ψµ + µ − ] = 3.80 +0.59 −0.64 × 10 −6 , B[χ c1 (1P ) → J/ψµ + µ − ] = 2.04 +0.36 −0.38 × 10 −4 , and B[χ c2 (1P ) → J/ψµ + µ − ] = 1.66 +0.19 −0.19 × 10 −4 .

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“…The branching fraction of lepton pair production in radiative decays of the excited B c meson B 1 → B 2 can be written in the form [47,48] dBr…”

Section: Lepton Pair Production In Radiative B C Meson Decaysmentioning

confidence: 99%

B_c excitations at LHC: first observations and further research prospects

Berezhnoy¹,

Belov²,

Лиходед

et al. 2019

EPJ Web Conf.

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Status of the Bc meson excitatons search is presented in our work. We discuss the 2S Bc states first discovered by ATLAS and newly confirmed by CMS and LHCb collaborations. We review the observation prospects for the rest predicted states (B∗c, 2P wave, 3P wave and D wave) at LHC experiments. Cascade decays to the ground state as well as direct decays to the lepton pair are regarded for these states.

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Muon pair production in radiative decays of heavy quarkonia

Abstract: Muon pair production in exclusive radiative decays χcJ → J/ψµµ, χ bJ → Υµµ are considered. We present numerical values of the branching fractions and distributions over various kinematical variables.

Cited by 9 publications

References 23 publications

B_c excitations at LHC experiments

B_c excitations at LHC experiments

Study of the dilepton electromagnetic decays of $$\chi _{cJ}(1P)$$

B_c excitations at LHC: first observations and further research prospects

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Muon pair production in radiative decays of heavy quarkonia

Abstract: Muon pair production in exclusive radiative decays χcJ → J/ψµµ, χ bJ → Υµµ are considered. We present numerical values of the branching fractions and distributions over various kinematical variables.

Cited by 9 publications

References 23 publications

Bc excitations at LHC experiments

Bc excitations at LHC experiments

Study of the dilepton electromagnetic decays of $$\chi _{cJ}(1P)$$

Bc excitations at LHC: first observations and further research prospects

Contact Info

Product

Resources

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B_c excitations at LHC experiments

B_c excitations at LHC experiments

B_c excitations at LHC: first observations and further research prospects