In the paper, we present a detailed discussion on the semi-inclusive production of doubly heavy baryons (Ξ bc and Ξ bb ) through top-quark decay channel, t → Ξ bQ ′ +Q ′ +W + , within the framework of nonrelativistic QCD. In our calculations, the contributions from the intermediate diquark states, bc [ 3 S 1 ]3 /6 , bc [ 1 S 0 ]3 /6 , bb [ 1 S 0 ] 6 , and bb [ 3 S 1 ]3, have been taken into consideration. Main uncertainties from the heavy quark mass (m c , m b or m t ), the renormalization scale µ r , and the nonperturbative transition probability have been estimated. For a comparison, we also analyze the production of doubly heavy baryons under the approximate fragmentation function approach. Estimated at the LHC or a High Luminosity LHC with L =10 34−36 cm −2 s −1 , there will be about 2.25 × 10 4−6 events of Ξ bc and 9.49 × 10 2−4 events of Ξ bb produced in one operation year through top-quark decays. * Recently, the LHCb Collaboration of the CERN LHC announced its first observation of the doubly heavy baryon Ξ ++ cc [1] for the proton-proton center-of-mass collision energy of 13 TeV and an integrated luminosity of 1.7 f b −1 , confirming the success of the quark model [2][3][4][5]. However, there is still no explicit evidence on the doubly heavy baryons Ξ bc and Ξ bb (throughout the paper, we label them as Ξ bQ ′ , with Q ′ representing the heavy b or c quark, respectively). A careful study on the Ξ bQ ′ production shall be helpful for confirming whether enough baryon events can be produced and for further testing of the quark model and the nonrelativistic QCD (NRQCD) [6,7]. Here, Ξ bQ ′ stands for the doubly heavy baryon Ξ bQ ′ q , where q denotes the light u, d, or s quark, respectively. At present, various methods for the production of doubly heavy baryons have been analyzed in the literature, such as those via the e + e − collisions [8][9][10][11], the hadronic collisions [9,[12][13][14][15][16][17][18][19][20][21], the gamma gamma collisions [14,22], the photoproduction mechanisms [14,23,24], the heavy ion collisions [25,26], etc.It has been confirmed that sizable doubly heavy baryons can be produced at the LHC via the hadronic production mechanisms; their production properties can be simulated by using a dedicated generator GENXICC [17,18,20]. In this paper, we shall discuss the production of doubly heavy baryons Ξ bQ ′ via the top-quark decays at the LHC or its successor [the High Luminosity LHC (HL-LHC)]. Because of the advantage of high luminosity and high energy, the LHC has already become a huge "top factory". For example, when the luminosity is up to 10 34 ∼ 10 36 cm −2 s −1 , there will be about 10 8 ∼ 10 10 tt pairs produced in one operation year at the LHC [27,28]. Thus, the top-quark decays will be a potentially good platform for studying the indirect production mechanism of the doubly heavy baryons and for searching the undetected Ξ bQ ′ . The decay width of the top quark is expected to be dominated by the process t → bW + . Thus, in the following, we shall study the production of doubly heav...
We systematically analyzed the production of semi-inclusive doubly heavy baryons (Ξ cc , Ξ bc and Ξ bb ) for the process H 0 → Ξ QQ ′ +Q ′ +Q through four main Higgs decay channels within the framework of non-relativistic QCD. The contributions from the intermediate diquark states, cc, have been taken into consideration. The differential distributions and three main sources of the theoretical uncertainties have been discussed. At the High Luminosity Large Hadron Collider, there will be about 0.43×10 4 events of Ξ cc , 6.32×10 4 events of Ξ bc and 0.28×10 4 events of Ξ bb produced per year. There are fewer events produced at the Circular Electron Positron Collider and the International Linear Collider, about 0.26 × 10 2 events of Ξ cc , 3.83 × 10 2 events of Ξ bc and 0.17 × 10 2 events of Ξ bb in operation.
In this study, Higgs and Z boson associated production with subsequent decay is attempted in the framework of alternative left-right model, which is motivated by superstring-inspired E6 model at CEPC and future linear colliders. We systematically analyze each decay channel of Higgs with theoretical constraints and latest experimental methods. Due to the mixing of scalars in the Higgs sector, charged Higgs bosons can play an essential role in the phenomenological analysis of this process. Even though the predictions of this model for the signal strengths of this process are close to the standard model expectations, it can be distinct under high luminosity.
In the paper, we discuss the possibility of observation of heavy quarkoniums via the processes involving flavor changing neutral currents (FCNC). More explicitly, we systematically calculate the production of heavy charmonium and (cb)-quarkonium through the top quark semiexclusive rare FCNC decays in the framework of the nonrelativistic QCD (NRQCD) factorization theory. Our results show that the total decay widths t→η c = 1.20 GeV, where the uncertainties are from variation of quark masses and renormalization scales. Even though the decay widths are small, it is important to make a systematic study on the production of charmonium and (cb)-quarkonium through the top-quark decays via FCNC in the Standard Model, which will provide useful guidance for future new physics research from the heavy quarkonium involved processes.
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