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Measuring relic abundance of minimal dark matter at hadron colliders

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Science China(Physics,Mechanics & Astronomy) 2019年第8期62卷 55-74页

作者： QingHong Cao Ti Gong KePan Xie Zhen Zhang Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Collaborative Innovation Center of Quantum Matter Center for High Energy Physics Peking University Center for Theoretical Physics Department of Physics and Astronomy Seoul National University

We consider the special case that the dark matter(DM) candidate is not detected in direct-detection programs when the experimental sensitivity reaches the neutrino flux background. In such circumstance the DM searches at the colliders impose constraints on the DM relic abundance if the DM candidate is a WIMPs type. Specifically, we consider the triplet(quintet and septet) DMs in the framework of minimal DM model and explore the potential of discovering the DM candidate in the mono-jet, mono-photon and vector boson fusion channels at the Large hadron Collider(LHC) and future 100 TeV hadron collider. If the DM candidate in such a scenario is discovered at the LHC, then additional DM candidates are needed to explain the observed relic *** the other hand, null results in those DM searching programs at the colliders give rise to lower limits of DM relic abundance.

关键词： dark matter electro weak interactions hadron colliders

Dependence of Long Range Correlation on Width of Rapidity Gap in High Energy hadron-hadron Collisions

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Chinese Physics Letters 1994年第10期11卷 601-604页

作者： YANG Jie LIU Lianshou YANG Zhongle Institute of Particle Physics Huazhong Normal UniversityWuhan 430070 Institute of High Energy Physics Academia SinicaBeijing 100039 South Central College for Nationalities Wuhan 430074

The dependence of long range correlation in high energy hadron-hadron collisions on the width of rapidity gap is studied,It is shown that the result from a model with only one particle source does not fit the experimental *** order to get the experimental dependence of long range correlation on the width of rapidity gap at least three particle sources are needed.

关键词： particle hadron Collisions

hadron FRAGMENTATION IN QUANTUM FIELD AT SHORT DISTANCE

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Chinese Science Bulletin 1986年第6期31卷 371-378页

作者：赵树松彭守礼 Department of Physics Yunnan University Kunming Department of Physics Yunnan University Kunminghe hypothesis of limiting fragmentation proposed by C.N. Yang and his colleagues plays a considerable part in the interpretation of the high energy pheno-mena of the hadron-hadron collision. By analyzing a great amount of experimental data it is shown that the hadron fragmentation is a correct and proper theoretical

The hypothesis of limiting fragmentation proposed by C.N. Yang and his colleagues plays a considerable part in the interpretation of the high energy pheno-mena of the hadron-hadron collision. By analyzing a great amou... 详细信息

关键词： fragmentation hadron collision interpretation hypothesis correct limiting momentum determ transverse

hadron JETS OF QUANTUM FIELD AT SHORT DISTANCE

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Chinese Science Bulletin 1986年第3期31卷 161-169页

作者：赵树松彭守礼 Kunming Branch Academia Sinica Department of Physics Yunnan University Kunminguantum field theory may be thought of as a theory of coupled Green's functions which are uniquely determined by the physical vacuum expectation values of the time-ordered products of the field operators under consideration. For the processes in which N-hadrons are produced a+b→1+2…+N (N+2)-point

Quantum field theory may be thought of as a theory of coupled Green’s functions which are uniquely determined by the physical vacuum expectation values of the time-ordered products of the field operators under consid... 详细信息

关键词： operators uniquely ordered expectation momentum hadron 昼梦 dimensionality algebra nonnegative

Ionization Chamber Dosimetry for Conventional and Laser-Driven Clinical hadron Beams

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Journal of Biosciences and Medicines 2015年第4期3卷 8-17页

作者： F. Scarlat A. Scarisoreanu E. Badita C. Vancea I. I. Calina Fl. Scarlat N. Verga Valahia Univesity of Targoviste Targoviste Romania National Institute for Laser Plasma and Radiation Physics-INFLPR Bucharest-Magurele Romania BitSolutions Bucharest Romania University of Medicine and Pharmacy “Carol Davila” Bucharest Romania

The practice of using the direct ionization radiation (electrons, protons, antiprotons, pions, ions, etc) or of the indirect ionization radiation (photons, neutrons, etc) in economy and social life has led to the introduction of the absorbed dose magnitude (ICRU 1953) defined as the energy absorbed per mass unit of the irradiated substance. This is a fundamental magnitude valid for any type of ionizing radiation, any irradiated material and any radiation energy. In case of clinical hadron beams generated by conventional accelerators or those controlled by lasers, IAEA TRS 398 recommends the absorbed dose to water. This may be determined employing the calorimeter method with water or graphite, chemical method, fluence based measurements as Faraday cups or activation measurements, and the ionization chamber method. In this paper the selected method was the thimble air filled ionization chamber method for determination of absorbed dose to water.

关键词： Absorbed Dose to Water Ionization Chamber hadron Therapy hadron Dosimetry Expand Uncertainty

A New Strategy for Solving Two Cosmological Constant Problems in hadron Physics

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Journal of Modern Physics 2013年第5期4卷 686-703页

作者： Thomas L. Wilson NASA Johnson Space Center—KR Houston USA

A new approach to solving two of the cosmological constant problems (CCPs) is proposed by introducing the Abbott-Deser (AD) method for defining Killing charges in asymptotic de Sitter space as the only consistent means for defining the ground-state vacuum for the CCP. That granted, Einstein gravity will also need to be modified at short-distance nuclear scales, using instead a nonminimally coupled scalar-tensor theory of gravitation that provides for the existence of QCD’s two-phase vacuum having two different zero-point energy states as a function of temperature. Einstein gravity alone cannot accomplish this. The scalar field will be taken from bag theory in hadron physics, and the origin of the bag constant B is accounted for by gravity’s CC as B—noting that the Higgs mechanism does not account for either the curved-space origin of λ or the mass of composite hadrons. A small Hubble-scale graviton mass mg^10-33eV naturally appears external to the hadron bag, induced by λ≠0. This mass is unobservable and gravitationally gauge-dependent. It is shown to be related to the cosmological event horizon in asymptotic de Sitter space.

关键词： Cosmological Constant Problem Vacuum Energy Density hadron Physics Asymptotic de Sitter Space Zero-Point Energy

Pseudoscalar Top-Bottom Quark-Antiquark Composite as the Resonance with 28 GeV at the LHC: hadron Masses and Higgs Boson Masses Based on the Periodic Table of Elementary Particles

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Journal of Modern Physics 2018年第14期9卷 2638-2656页

作者： Ding-Yu Chung Utica Michigan USA

This paper posits that the observed resonance with 28 GeV at the LHC is the pseudoscalar top-bottom quark-antiquark composite which has the calculated mass of 27.9 GeV derived from the periodic table of elementary particles. The calculated mass is for the mass of?. In the periodic table of elementary particles, t quark (13.2 GeV) in the pseudoscalar top-bottom quark-antiquark composite is only a part of full t quark (175.4 GeV), so pseudoscalar?(26.4 GeV) cannot exist independently, and can exist only in the top-bottom quark-antiquark composite. As shown in the observation at the LHC, the resonance with 28 GeV weakens significantly at the higher energy collision (13 TeV), because at the higher collision energy, low-mass pseudoscalar? in the composite likely becomes independent full high-mass vector? moving out of the composite. The periodic table of elementary particles is based on the seven mass dimensional orbitals derived from the seven extra dimensions of 11 spacetime dimensional membrane. The calculated masses of hadrons are in excellent agreement with the observed masses of hadrons by using only five known constants. For examples, the calculated masses of proton, neutron, pion (π±), and pion (±0) are 938.261, 939.425, 139.540, and 134.982 MeV in excellent agreement with the observed 938.272, 939.565, 139.570, and 134.977MeV, respectively with 0.0006%, 0.01%, 0.02%, and 0.004%, respectively for the difference between the calculated and observed mass. The calculated masses of the Higgs bosons as the intermediate vector boson composites are in excellent agreements with the observed masses. In conclusion, the calculated masses of the top-bottom quark-antiquark composite (27.9 GeV), hadrons, and the Higgs bosons by the periodic table of elementary particles are in excellent agreement with the observed masses of resonance with 28 GeV at the LHC, hadrons, and the Higgs bosons, respectively.

关键词： LHC CMS Resonance b Quark Jet Periodic Table of Elementary Particles Top Quark Bottom Quark hadron Masses Mass Calculation Higgs Boson

A Mechanism for hadron Molecule Production in <i>pp</i>(<i>p</i>) Collisions

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Journal of Modern Physics 2013年第12期4卷 1569-1573页

作者： Angelo Esposito Fulvio Piccinini Alessandro Pilloni Antonio D. Polosa 1Dipartimento di Fisica Sapienza Università di Roma Roma Italy 2Department of Physics Columbia University New York USA 1Dipartimento di Fisica Sapienza Università di Roma Roma Italy 2INFN Sezione di Roma 1 Roma Italy INFN Sezione di Pavia Pavia Italy

The problem of understanding loosely bound hadron molecules prompt production at hadron colliders is still open: how is it possible that meson molecules with binding energy compatible with zero could be formed within the bulk of the hadrons ejected in very high energy collisions? Monte Carlo simulations have been performed in the literature, leading to production cross sections, two orders of magnitude which were smaller than the experimental value. One possible mechanism to reduce this gap could be final state interactions of heavy mesons, but a precise evaluation of such effect is challenged by the presence of pions between the molecular constituents. In this paper, we present a new mechanism by using precisely such comoving pions. Heavy meson pairs can indeed slow down because of elastic scattering with surrounding pions. The number of low-relative-momentum meson pairs increases, thereby enhancing prompt production cross section. In this preliminar simulation, we show that an enhancement of 100 is indeed possible.

关键词： Exotic Spectroscopy Heavy Quark Phenomenology hadron Scattering Monte Carlo Simulations

THE SIMULATION OF DIMUON PRODUCTION IN hadron-hadron INTERACTIONS AND THEIR TRANSPORT

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Chinese Science Bulletin 1981年第6期26卷 573-574页

作者：张长春 Institute of High Energy Physics Academia Sinica

We have simulated the production of dimuon events in hadron-hadron interactions and their transport, and calculated the geometric acceptance of a forward spectrometer for dimuon events. According to the Drell-Yan mech... 详细信息

关键词： hadron quark spectrometer momentum meson acceptance invar behaviour atter determ