您当前的位置:首页 > 论文浏览
您选择的条件: 2017-08-02(5)

1. chinaXiv:201708.00099 [pdf]

Discovery of Yuomys from Altun Shan, Xinjiang, China

WANG Ban-Yue
分类: 地球科学 >> 地质学

Specimens reported in this note represent the frst discovery of Yuomys in Altun Shan. A new species, Yuomys altunensis, is established based on the following features: molars large and wide in proportion; metaconule distinctly separated from metacone, metaloph long, but incomplete; hypocone smaller than protocone; sinus extending to base of crown on lingual side; postcingulum connectting lingual side of metacone; metacone crescent and postcingulum short in M3. Yuomys altunensis is similar to Y. cavioides, Y. eleganes and Y. huangzhuangensis of late Middle Eocene in molar morphlogy. According to its evolutionary level, Y. altunensis is supposed as of late Middle Eocene in age, or slightly later. 记述了在新疆巴音郭楞蒙古族自治州若羌县阿尔金山地区彩虹沟首次发现的豫鼠一新种:阿尔金豫鼠(Yuomys altunensis sp. nov.)。其主要特征是臼齿的尺寸较大,比例上较宽,齿冠较高,臼齿的后小尖与后尖明显分开,后脊相对较长,但不完全,次尖明显小于原尖,舌侧内凹伸达臼齿齿冠基部,后齿带与后尖舌侧连; M3后尖为新月形,后齿带较短等。根据豫鼠臼齿的进化趋势和新种臼齿的尺寸较大、齿冠较高和舌侧内凹伸达齿冠基部的特征与Y. cavioides, Y. eleganes和Y. huangzhuangensis相近,但颊齿比例较宽判断 Y.altunensis可能与该3种处于同样的进化阶段或稍进步。其产出的地层时代很可能与它们相近或稍晚,即为晚中始新世或稍晚

提交时间: 2017-08-02 来自合作期刊:《古脊椎动物学报》 点击量124, 下载量0

2. chinaXiv:201708.00097 [pdf]

Diboson excess and Z'–predictions via left-right non–linear Higgs

Jing Shu; Juan Yepes
分类: 物理学 >> 基本粒子与场物理学

We explore lepton-flavored electroweak baryogenesis, driven by CP-violation in leptonic Yukawa sector, using the τ −µ system in the two Higgs doublet model as an example. This setup generically yields, together with the flavor-changing decay h → τµ, a tree-level Jarlskog-invariant that can drive dynamical generation of baryon asymmetry during a first-order electroweak phase transition and results in CP-violating effect in the decay h → τ τ . We find that the observed baryon asymmetry can be generated in parameter space compatible with current experimental results for the decays h → τµ, h → τ τ The excess events reported by the ATLAS Collaboration in the W Z–final state, and by the CMS Collaboration in the e +e−jj, W h and jj–final states, may be induced by the decays of a heavy boson W0 in the 1.8–2 TeV mass range, here modelled via the larger local group SU(2)L × SU(2)R × U(1)B−L in a non–linear dynamical Higgs scenario. The W0 –production cross section at the 13 TeV LHC is around 700–1200 fb. This framework also predicts a heavy Z' boson with a mass of 2.5–4 TeV, and some decay channels testable in the LHC Run II. We determine the cross section times branching fractions for the dijet, dilepton and top–pair Z' –decay channels at the 13 TeV LHC around 2.3, 7.1, 70.2 fb respectively, for MZ' = 2.5 TeV, while one/two orders of magnitude smaller for the dijet/dilepton and top–pair modes at MZ' = 4 TeV. Non-zero contributions from the effective operators, and the underlying Higgs sector of the model, will induce sizeable enhancement in the W+W− and Zh–final states that could be probed in the future LHC Run II.and τ → µγ, as well as the present bound on the electric dipole moment of the electron. The baryon asymmetry generated is intrinsically correlated with the CP-violating decay h → τ τ and the flavor-changing decay h → τµ, which thus may serve as “smoking guns” to test lepton-flavored electroweak baryogenesis.

提交时间: 2017-08-02 点击量124, 下载量16

3. chinaXiv:201708.00095 [pdf]

Lepton-Flavored Electroweak Baryogenesis

Huai-Ke Guo; Ying-Ying Li; Tao Liu; Michael Ramsey-Musolf; Jing Shu
分类: 物理学 >> 基本粒子与场物理学

We explore lepton-flavored electroweak baryogenesis, driven by CP-violation in leptonic Yukawa sector, using the τ −µ system in the two Higgs doublet model as an example. This setup generically yields, together with the flavor-changing decay h → τµ, a tree-level Jarlskog-invariant that can drive dynamical generation of baryon asymmetry during a first-order electroweak phase transition and results in CP-violating effect in the decay h → τ τ . We find that the observed baryon asymmetry can be generated in parameter space compatible with current experimental results for the decays h → τµ, h → τ τ and τ → µγ, as well as the present bound on the electric dipole moment of the electron. The baryon asymmetry generated is intrinsically correlated with the CP-violating decay h → τ τ and the flavor-changing decay h → τµ, which thus may serve as “smoking guns” to test lepton-flavored electroweak baryogenesis.

提交时间: 2017-08-02 点击量18, 下载量17

4. chinaXiv:201708.00085 [pdf]

The Maximally Symmetric Composite Higgs

Csaba Cs´aki; Teng Ma; Jing Shu
分类: 物理学 >> 基本粒子与场物理学

We present a novel class of calculable four dimensional composite pseudo-Goldstone boson Higgs models based on symmetric G/H coset spaces which contain a Higgs-parity operator V as well as a linear representation Σ0 for the Goldstone bosons. For such cosets the low-energy effective Lagrangian for the Standard Model fields can have an enhanced global symmetry which we call the maximal symmetry. We show that such a maximally symmetric case leads to a finite and fully calculable Higgs potential, which also minimizes the tuning by eliminating double tuning and reducing the Higgs mass. We present a detailed analysis of the Maximally Symmetric SO(5)/SO(4) model, and comment on its observational consequences.

提交时间: 2017-08-02 点击量13, 下载量13

5. chinaXiv:201708.00078 [pdf]

GravitationalWave Signals of Electroweak Phase Transition Triggered by Dark Matter

Wei Chao; Huai-Ke Guo; Jing Shu
分类: 物理学 >> 基本粒子与场物理学

We study in this work a scenario that the universe undergoes a two step phase transition with the first step happened to the dark matter sector and the second step being the transition between the dark matter and the electroweak vacuums, where the barrier between the two vacuums, that is necessary for a strongly first order electroweak phase transition (EWPT) as required by the electroweak baryogenesis mechanism, arises at the tree-level. We illustrate this idea by working with the standard model (SM) augmented by a scalar singlet dark matter and an extra scalar singlet which mixes with the SM Higgs boson. We study the conditions for such pattern of phase transition to occur and especially for the strongly first order EWPT to take place, as well as its compatibility with the basic requirements of a successful dark matter, such as observed relic density and constraints of direct detections. We further explore the discovery possibility of this pattern EWPT by searching for the gravitational waves generated during this process in spaced based interferometer, by showing a representative benchmark point of the parameter space that the generated gravitational waves fall within the sensitivity of eLISA, DECIGO and BBO.

提交时间: 2017-08-02 点击量15, 下载量14

  [1 页/ 5 条记录]