Dirac Neutrino Masses in NCG

Li, Changhui; Ding, Hao-Gang; Dai, Jian S.; Song, X.

doi:10.1088/0253-6102/35/4/441

Cited by 17 publications

(117 citation statements)

References 12 publications

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“…[2,3]. And it has been found that the indirect production of B c via top quark decays can also provide useful information on B c meson [4][5][6][7].Comparing with the hadronic colliders, an e + e − collider has its own advantages, mainly because of its lower background. As for the previous LEP-I experiment, no B c events have been found due to its lower collision energy and low luminosity [8,9].…”

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confidence: 99%

“…To derive analytical expression for the process Z 0 → B ( * ) c + b +c and to make its form simpler as much as possible, we adopt the 'new trace amplitude approach' suggested and developed by Refs. [5,8] to do our calculation. Under the approach, we first arrange each of the four amplitudes listed in Eqs.…”

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confidence: 99%

“…A computer program BCVEGPY for the direct hadronic production of B c meson has been presented in Refs. [2,3]. And it has been found that the indirect production of B c via top quark decays can also provide useful information on B c meson [4][5][6][7].…”

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Z0 boson decays to $B^{(*)}_{c}$ meson and its uncertainties

Deng

Yang

et al. 2010

Eur. Phys. J. C

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The programming new e + e − collider with high luminosity shall provide another useful platform to study the properties of the doubly heavy Bc meson in addition to the hadronic colliders as LHC and TEVATRON. Under the 'New Trace Amplitude Approach', we calculate the production of the spin-singlet Bc and the spin-triplet B * c mesons through the Z 0 boson decays, where uncertainties for the production are also discussed. Our results show Γ ( PACS numbers: 12.38. Bx, 12.39.Jh, 14.40Lb, 14.40.Nd The B c meson is a double heavy quark-antiquark bound state and carries flavors explicitly. Since its first discovery at TEVATRON [1], B c physics is attracting more and wide interests. Recently, many progresses have been made for the hadronic production of B c meson at high energy colliders as LHC and TEVATRON. A computer program BCVEGPY for the direct hadronic production of B c meson has been presented in Refs. [2,3]. And it has been found that the indirect production of B c via top quark decays can also provide useful information on B c meson [4][5][6][7].Comparing with the hadronic colliders, an e + e − collider has its own advantages, mainly because of its lower background. As for the previous LEP-I experiment, no B c events have been found due to its lower collision energy and low luminosity [8,9]. However, if the luminosity of the e + e − collider can be raised up to L ∝ 10 34 cm −2 s −1 or even higher as programmed by the Internal Linear Collider (ILC) [10], then there might have enough events. Moreover, if the e + e − collider further runs at the Z 0 -boson energy, the resonance effects at the Z 0 peak may raise the production rate up to several orders. It has been estimated by Ref.[11] that more than 10 9∼10 Z 0 -events can be produced at ILC per year, which is about 3 ∼ 4 orders higher than that collected by LEP-I. Such a high luminosity collider is called as GigaZ [11] or a Z-factory [12]. Then it will open new opportunities not only for high precision physics in the electro-weak sector, but also for the hadron physics.The production of B c through Z 0 decays has been studied in Refs [8,9,13] with various methods. Since the process is very complicated, it would be helpful to have a cross check of these results. Furthermore, considering the forthcoming Z-factory, it may be interesting to know the theoretical uncertainties in estimating of B c production.For the purpose, we need to calculate the processc +b+c, whose Feynman diagrams are shown in Fig.(1). According to the NRQCD factorization formula * e-mail:wuxg@cqu.edu.cnc[14], the decay width for the process Z 0 → B ( * ) c + b +c can be written in the following factorization form:where the matrix element O H (n) is proportional to the inclusive transition probability of the perturbative state cb[n] into the bound states of B c . As for the two colorsinglet S-wave states cb[are related with the Bethe-Salpeter wave function at the origin that can be determined by the potential model [15][16][17][18][19][20]. dΓ(Z 0 → cb[n] + b +c) stands for the short-distan...

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Z0 boson decays to $B^{(*)}_{c}$ meson and its uncertainties

Deng

Yang

et al. 2010

Eur. Phys. J. C

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“…Note that in fact the configurations (cb) 8 ( 1 S 0 ) and (cb) 8 ( 3 S 1 ) play comparatively an important role only for the production of the P -wave excited B c states as shown in Ref. [5]. It contains five source files: s bound.F, s common.F, s foursets.F, s free.F and s samp.F.…”

Section: Summary Of the Changes (Improvements)mentioning

confidence: 99%

An upgraded version of the generator BCVEGPY2.0 for hadronic production of meson and its excited states

Chang

Wang

2006

Computer Physics Communications

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An upgraded version of the package [BCVEGPY2.0: Chao-Hsi Chang, Jian-Xiong Wang and Xing-Gang Wu, Comput. Phys. Commun. 174 (2006) [241][242][243][244][245][246][247][248][249][250][251] is presented, which works under LINUX system and is named as BCVEGPY2.1. Using this version with a GNU C compiler, users may simulate the B c -events in various experimental environments very conveniently. It has been rearranged for better modularity and code reusability (less dependency among various modules) than BCVEGPY2.0 has. Furthermore, in the upgraded version a special and convenient executable-file run as default is available according to one's wish, i.e., the file is obtained in the way that the GNU command make compiles the codes requested by precise purpose with the help of a master makefile in the main code directory. Finally, this paper may also be considered as an erratum of the original BCVEGPY2.0, i.e., here the errors (typo mainly) in BCVEGPY2.0 have been corrected. Nature of physical problem : Hadronic production of B c meson itself and its excited states. Method of solution :The code with option can generate weighted and un-weighted events.An interface to PYTHIA is provided to meet the needs of jets hadronization in the production. 2Restrictions on the complexity of the problem : The hadronic production of (cb)-quarkonium in S-wave and P -wave states via the mechanism of gluon-gluon fusion are given by the so-called 'complete calculation' approach.Reasons for new version : Responding to the feedback from users, we rearrange the program in a convenient way and then it can be easily adopted by the users to do the simulations according to their own experimental environment (e.g. detector acceptances and experimental cuts). We have paid many efforts to rearrange the program into several modules with less dependency among the modules, the main program is slimmed down and all the further actions are decoupled from the main program and can be easily called for various purposes.Typical running time : The typical running time is machine and user-parameters dependent.Typically, for production of the S-wave (cb)-quarkonium, when IDWTUP=1, it takes about 20 hour on a 1.8 GHz Intel P4-processor machine to generate 1000 events; however, when IDWTUP=3, to generate 10 6 events it takes about 40 minutes only. Of the production, the time for the P -wave (cb)-quarkonium will take almost two times longer than that for its S-wave quarkonium.Keywords : Event generator; Hadronic production; B c meson.Summary of the changes (improvements) :(1) The structure and organization of the program have been changed a lot. The new version

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“…(1), where k 1 and k 2 are two momenta for the initial gluons, q b2 and q c4 are momenta for the two outgoingb andc, P is the momentum of Ξ bc . [14,21,22], the hadronic production of Ξ bc can be divided into three steps: the first step is the production of a cc-pair and a bb-pair that can be calculated by pQCD, since the intermediate gluon should be hard enough to form a heavy quark-antiquark pair. The second step is that the two heavy quarks fusion into a binding (bc)-diquark, and the third step is the fragmentation of such diquark into the desired baryon by grabbing a light quark and suitable number of gluons when needs.…”

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Hadronic production of the doubly heavy baryonΞbcat the LHC

Zhang

Zhong

et al. 2011

Phys. Rev. D

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We investigate the hadronic production of the doubly heavy baryon Ξ bc at the large hadron collider (LHC), where contributions from the four (bc)-diquark states (bc)3 ,6 [ 1 S0] and (bc)3 ,6 [ 3 S1] have been taken into consideration. Numerical results show that under the condition of pT > 4 GeV and |y| < 1.5, sizable Ξ bc events about 1.7 × 10 7 and 3.5 × 10 9 per year can be produced for the center-of-mass energy √ S = 7 TeV and √ S = 14 TeV respectively. For experimental usage, the total and the interested differential cross-sections are estimated under some typical pT -and y-cuts for the LHC detectors CMS, ATLAS and LHCb. Main uncertainties are discussed and a comparative study on the hadronic production of Ξcc, Ξ bc and Ξ bb at LHC are also presented.

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Dirac Neutrino Masses in NCG

Cited by 17 publications

References 12 publications

Z0 boson decays to $B^{(*)}_{c}$ meson and its uncertainties

Z0 boson decays to $B^{(*)}_{c}$ meson and its uncertainties

An upgraded version of the generator BCVEGPY2.0 for hadronic production of meson and its excited states

Hadronic production of the doubly heavy baryonΞbcat the LHC

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