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1. chinaXiv:201609.00990 [pdf]

Search for low-mass Higgs and dark photons at BESIII

Vindhyawasini Prasad; Haibo Li; Xinchou Lou
Subjects: Physics >> Nuclear Physics

Many extensions of the Standard Model introduce a new type of weak-interacting degrees of freedom. These models are motivated by the results of recent experimental anomalies. Typical models, such as Next-to-Minimal Supersymmetric Standard Model and Light Hidden Dark-sector Model, introduce the possibilities of low-mass Higgs and dark bosons. The masses of such particles are expected to be few GeV and thus making them accessible at BESIII experiment, an?e+e??collider experiment running at tau-charm region. This report summarizes the recent results of low-mass Higgs and dark bosons searches at BESIII.

submitted time 2016-09-14 Hits674Downloads374 Comment 0

2. chinaXiv:201609.00971 [pdf]

Concept for a Future Super Proton-Proton Collider

Jingyu Tang; J. Scott Berg; Weiping Chai; Fusan Chen; Nian Chen; Weiren Chou; HaiyiDong; Jie Gao; Tao Han; Yongbin Leng; Guangrui Li; Ramesh Gupta; Peng Li; Zhihui Li; Baiqi Liu; Yudong Liu; Xinchou Lou; Qing Luo; Ernie Malamud; Lijun Mao
Subjects: Physics >> Nuclear Physics

Following the discovery of the Higgs boson at LHC, new large colliders are being studied by the international high-energy community to explore Higgs physics in detail and new physics beyond the Standard Model. In China, a two-stage circular collider project CEPC-SPPC is proposed, with the first stage CEPC (Circular Electron Positron Collier, a so-called Higgs factory) focused on Higgs physics, and the second stage SPPC (Super Proton-Proton Collider) focused on new physics beyond the Standard Model. This paper discusses this second stage.

submitted time 2016-09-14 Hits994Downloads590 Comment 0

3. chinaXiv:201609.00924 [pdf]

Physics cross sections and event generation of $e^+e^-$ annihilations at the CEPC

Xin. Mo; Gang. Li; Manqi. Ruan; Xinchou. Lou
Subjects: Physics >> Nuclear Physics

The cross sections of the Higgs production and the corresponding backgrounds of?e+e??annihilations at the CEPC (Circular Electron and Positron Collider) are calculated by a Monte-Carlo method, and the beamstruhlung effect at the CEPC is carefully investigated. The potential for new physics beyond the Standard Model at the CEPC is discussed.

submitted time 2016-09-13 Hits872Downloads465 Comment 0

4. chinaXiv:201609.00922 [pdf]

Study of Photon Detection Efficiency and Position Resolution of BESIII Electromagnetic Calorimeter

Vindhyawasini Prasad; Chunxiu Liu; Xiaobin Ji; Weidong Li; Huaimin Liu; Xinchou Lou
Subjects: Physics >> Nuclear Physics

We study the photon detection efficiency and position resolution of the electromagnetic calorimeter (EMC) of the BESIII experiment. The control sample of the initial-state-radiation (ISR) process of?e+e?→γμ+μ??is used at?J/ψ?and?ψ(3770)?resonances for the EMC calibration and photon detection efficiency study. Photon detection efficiency is defined as the predicted photon, obtained by performing a kinematic fit with two muon tracks, matched with real photons in the EMC. The spatial resolution of the EMC is defined as the separation in polar (θ) and azimuthal (?) angles between charged track and associated cluster centroid on the front face of the EMC crystals.

submitted time 2016-09-13 Hits832Downloads481 Comment 0

5. chinaXiv:201609.00072 [pdf]

Study of BESIII electromagnetic calorimeter performance with radiative lepton pair events

Vindhyawasini Prasad1; Chunxiu Liu; Xiaobin Ji; Weidong Li; Huaimin Liu; Xinchou Lou
Subjects: Physics >> Nuclear Physics

We study the photon detection efficiency and position resolution of the electromagnetic calorimeter (EMC) of the BESIII detector. The control samples of the initial-state-radiation (ISR) process of?e+e?→γμ+μ??at?J/ψ?and?ψ(3770)?resonances are used for the calibration of the photon cluster shapes and photon detection efficiency study. The photon detection efficiency is defined as the fraction of predicted photon, determined by performing a kinematic fit with the four momenta of two charged tracks only, matched with the actual photons in the EMC. The spatial resolution of the EMC is studied in polar (θ) and azimuthal (?) angle directions in a cylindrical coordinate system centered at the interaction point, with z-axis along the beam direction.

submitted time 2016-09-06 Hits780Downloads448 Comment 0

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