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1. chinaXiv:201609.01000 [pdf]

A parametrization of the cosmic-ray muon flux at sea-level

Mengyun Guan; Ming-Chung Chu; Jun Cao; Kam-Biu Luk; Changgen Yang
Subjects: Physics >> Nuclear Physics

Based on the standard Gaisser's formula, a modified parametrization for the sea-level cosmic-ray muon flux is introduced. The modification is verified against experimental results. The average vertical cosmic-ray muon intensity as a function of depth of standard rock is simulated using the modified formula as input to the MUSIC code. The calculated muon intensities is consistent with the experimental measurements.

submitted time 2016-09-14 Hits871Downloads525 Comment 0

2. chinaXiv:201609.00970 [pdf]

Searching heavier Higgs boson via di-Higgs production at LHC Run-2

Lan-Chun L¨u; Chun Du y; Yaquan Fang; Hong-Jian He; Huijun Zhang?
Subjects: Physics >> Nuclear Physics

The LHC discovery of a light Higgs particle?h0?(125GeV) opens up new prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will unambiguously point to new physics beyond the standard model (SM). We study the detection of a heavier neutral Higgs boson?H0?via di-Higgs production channel at the LHC (14TeV),?H0→h0h0→WW?γγ. This directly probes the?Hhh?cubic Higgs interaction, which exists in most extensions of the SM Higgs sector. For the decay products of final states?WW?, we include both pure leptonic mode?WW?→?ν???ν?and semi-leptonic mode?WW?→qq?′?ν. We analyze signals and backgrounds by performing fast detector simulation for the full processes?pp→H→hh→WW?γγ→?ν???νγγ?and?pp→H→hh→WW?γγ→?νqq?′γγ, over the mass range?MH=250?600GeV. For generic two-Higgs-doublet models (2HDM), we present the discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it with the current Higgs global fit of the 2HDM parameter space.

submitted time 2016-09-14 Hits881Downloads473 Comment 0

3. chinaXiv:201609.00884 [pdf]

Neutrino Oscillation Studies with Reactors

P. Vogel; L. J. Wen; C. Zhang
Subjects: Physics >> Nuclear Physics

Nuclear reactors are one of the most intense, pure, controllable, cost-effective, and well-understood sources of neutrinos. Reactors have played a major role in the study of neutrino oscillations, a phenomenon that indicates that neutrinos have mass and that neutrino flavors are quantum mechanical mixtures. Over the past several decades reactors were used in the discovery of neutrinos, were crucial in solving the solar neutrino puzzle, and allowed the determination of the smallest mixing angle?θ13. In the near future, reactors will help to determine the neutrino mass hierarchy and to solve the puzzling issue of sterile neutrinos.

submitted time 2016-09-13 Hits502Downloads336 Comment 0

4. chinaXiv:201609.00028 [pdf]

Zc(3900) as a D ?D? Molecule from Pole Counting Rule

Qin-Rong Gong; Zhi-Hui Guo; Ce Meng; Guang-Yi Tang; Han-Qing Zheng
Subjects: Physics >> Nuclear Physics

A careful study on the nature of the Z_c(3900) resonant structure is carried out in this work. By constructing the pertinent effective Lagrangians and considering the important final-state-interaction effects, we first give a unified description to all the relevant experimental data available, including the J/\psi\pi and \pi\pi invariant mass distributions from the e^+e^-\to J/\psi\pi\pi process, the h_c\pi distribution from e^+e^-\to h_c\pi\pi and also the D\bar{D}^{*} spectrum in the e^+e^-\to D\bar{D}^{*}\pi process. After fitting the unknown parameters to the previous data, we search the pole in the complex energy plane and only find one pole in the nearby energy region in different Riemann sheets. Therefore we conclude that Z_c(3900) is of D\bar{D}^* molecular nature, according to the pole counting rule method. We emphasize that the conclusion based upon pole counting method is not trivial, since both the D\bar{D}^{*} contact interactions and the explicit Z_c exchanges are introduced in our analyses and they lead to the same conclusion.

submitted time 2016-09-02 Hits920Downloads467 Comment 0

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