Carnegie Mellon University

About: Carnegie Mellon University is a education organization based out in Pittsburgh, Pennsylvania, United States. It is known for research contribution in the topics: Computer science & Robot. The organization has 36317 authors who have published 104359 publications receiving 5975734 citations. The organization is also known as: CMU & Carnegie Mellon.

Parametrization of the Kobayashi-Maskawa Matrix

Abstract: The quark mixing matrix (Kobayashi-Maskawa matrix) is expanded in powers of a small parameter $\ensuremath{\lambda}$ equal to $sin{\ensuremath{\theta}}_{c}=0.22$. The term of order ${\ensuremath{\lambda}}^{2}$ is determined from the recently measured $B$ lifetime. Two remaining parameters, including the $\mathrm{CP}$-nonconservation effects, enter only the term of order ${\ensuremath{\lambda}}^{3}$ and are poorly constrained. A significant reduction in the limit on $\frac{{\ensuremath{\epsilon}}^{\ensuremath{'}}}{\ensuremath{\epsilon}}$ possible in an ongoing experiment would tightly constrain the $\mathrm{CP}$-nonconservation parameter and could rule out the hypothesis that the only source of $\mathrm{CP}$ nonconservation is the Kobayashi-Maskawa mechanism.

How Learning Works : Seven Research-Based Principles for Smart Teaching

Abstract: List of Figures, Tables, and Exhibits. Foreword (Richard E. Mayer). Acknowledgments. About the Authors. Introduction Bridging Learning Research and Teaching Practice. 1 How Does Students' Prior Knowledge Affect Their Learning? 2 How Does the Way Students Organize Knowledge Affect Their Learning? 3 What Factors Motivate Students to Learn? 4 How Do Students Develop Mastery? 5 What Kinds of Practice and Feedback Enhance Learning? 6 Why Do Student Development and Course Climate Matter for Student Learning? 7 How Do Students Become Self-Directed Learners? Conclusion Applying the Seven Principles to Ourselves. Appendices. Appendix A What Is Student Self-Assessment and How Can We Use It? Appendix B What Are Concept Maps and How Can We Use Them? Appendix C What Are Rubrics and How Can We Use Them? Appendix D What Are Learning Objectives and How Can We Use Them? Appendix E What Are Ground Rules and How Can We Use Them? Appendix F What Are Exam Wrappers and How Can We Use Them? Appendix G What Are Checklists and How Can We Use Them? Appendix H What Is Reader Response/Peer Review and How Can We Use It? References. Name Index. Subject Index.

Combined Measurement of the Higgs Boson Mass in pp Collisions at √s=7 and 8 TeV with the ATLAS and CMS Experiments

Abstract: A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H→γγ and H→ZZ→4l decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is mH=125.09±0.21 (stat)±0.11 (syst) GeV.

Rethinking Organic Aerosols: Semivolatile Emissions and Photochemical Aging

Abstract: Most primary organic-particulate emissions are semivolatile; thus, they partially evaporate with atmospheric dilution, creating substantial amounts of low-volatility gas-phase material. Laboratory experiments show that photo-oxidation of diesel emissions rapidly generates organic aerosol, greatly exceeding the contribution from known secondary organic-aerosol precursors. We attribute this unexplained secondary organic-aerosol production to the oxidation of low-volatility gas-phase species. Accounting for partitioning and photochemical processing of primary emissions creates a more regionally distributed aerosol and brings model predictions into better agreement with observations. Controlling organic particulate-matter concentrations will require substantial changes in the approaches that are currently used to measure and regulate emissions.