DEUTSCH-US-AMERIKANISCHES AUSTAUSCH- PROGRAMM IN THEORETISCHER HADRONENPHYSIK GERMAN-US THEORY EXCHANGE ON HADRON PHYSICS

Transcription

1 Vorhabenbeschreibung DEUTSCH-US-AMERIKANISCHES AUSTAUSCH- PROGRAMM IN THEORETISCHER HADRONENPHYSIK GERMAN-US THEORY EXCHANGE ON HADRON PHYSICS Sprecher/Spokesperson: Prof. Dr. Klaus Peters (GSI Darmstadt and Goethe-University Frankfurt) Dauer/Duration: 3 Jahre, Start 1. Jan 2013 Hosts: GSI Helmholtzzentrum für Schwerionenphysik (Helmholtz Center for Heavy Ion Research), Darmstadt, Germany Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA, USA 1

2 Deutsch-US-amerikanisches Austauschprogramm in Theoretischer Hadronenphysik Zusammenfassung Eine Beschreibung der Natur, wie man sie experimentell beobachtet, wird durch die Identifizierung der fundamentalen Bausteine und deren Zusammenfügung zu komplexen Systemen erreicht. Eine der schwierigsten Herausforderungen der heutigen Physik ist die Beantwortung der zentralen Frage, wie stark-wechselwirkende Systeme aus fundamentalen Bausteinen, den Quarks und Gluonen, zusammengesetzt sind. Diese Fragen sind nur in einem internationalen Kontext lösbar und erfordern ein weltweites Netzwerk. Besonders die Möglichkeit längere Zeit mit wissenschaftlichen Kollegen in direktem Kontakt zu arbeiten, bietet eine stimulierendes Umfeld um neue Konzepte zu entwickeln und, über die üblichen Konferenzaufenthalte hinaus, neue theoretische Wege zu designen und auf den Weg zu bringen, welche dann im Heimatinstitut später im Detail ausgearbeitet und konkretisiert werden. Als ersten Schritt für ein größeres theoretisches Netzwerk beschreibt die vorliegende Skizze ein entsprechendes Austauschprogramm, welches deutschen Wissenschaftlern (in theoretische Hadronenphysik) den längeren Besuch bei US-amerikanischen Kollegen erlaubt. German-US Exchange Program on Hadron Physics Theory Summary A central challenge to modern science is the understanding of how complex structures are generated from seemingly simple, but strongly interacting systems. Composite systems of the point-like quarks and gluons have traditionally been understood in terms of mesons or baryons. Those problems can only be solved in a world-wide networking activity. In particular the possibility of an extended exchange with individual scientists provides a very productive atmosphere to develop new concepts and, apart from participation in conferences and workshops, stimulates the development of new theoretical approaches and to get things started, while details and more concrete applications will follow while back at the home institute. This sketch describes an exchange program as a first step for a large theoretical network. This exchange program would allow German scientists (in theoretical hadron physics) a longer visit of US-American colleagues and institutions. 2

3 1 The quest for the Exchange Program Hadron physics is a fast growing and fascinating field of research at the intersection of nuclear physics and elementary particle physics. It studies the binding of the smallest constituents of matter, point-like quarks and gluons, into strongly interacting hadrons, and the interactions of these particles. In the last few years, novel concepts and experiments have opened up a new era in the exploration of the constituents of matter. In particular, the study of exotic forms of hadronic matter has yielded spectacular results, particularly, but not only, in the charm sector. The underlying theory of the strong interactions, Quantum Chromodynamics (QCD), is known and well tested in high-energy reactions and is conceptually quite simple: it is a relativistic quantum field theory of quarks and gluons interacting according to the laws of non-abelian forces between color charges. It is an integral part of the Standard Model of particle physics. The deceptively simple-looking QCD Lagrangian is at the basis of the rich and complex phenomena of hadronic and nuclear physics. How this complexity arises in a theory with quarks and gluons as fundamental degrees of freedom is only qualitatively understood. At low energy scales, QCD becomes a strongly coupled theory, many aspects of which are not understood. Quarks have never been observed in isolation, but only as building blocks of color-neutral objects called hadrons. It is one of the great challenges of contemporary physics to understand this key feature of QCD, the confinement of quarks and gluons. As a consequence of confinement, information about quarks and gluons can only be obtained through investigations of hadronic systems mesons, baryons and, possibly, exotic states their production, decays and interactions. The important questions deal with the very existence and the properties of hadrons, e.g. the spectrum and their internal structure. A large variety of open questions have to be addressed for major progress in this field of research (e.g. how are quarks bound among each other, how does the structure of hadrons look like and how does it arise from the basic force, what are the effective degrees of freedom of hadrons and what are the masses and criteria of stability). We have a qualitative understanding of hadrons, but quantitative proofs are still outstanding. Most of these require very precise and/or high-statistics measurements of the decisive properties for a conclusive description of nature. This is performed via dedicated investigations and high-precision studies at modern large-scale facilities like PANDA (antiproton Annihilation at Darmstadt). PANDA is a forefront detector system which is being built for a broad and extensive program of experiments at the research center FAIR (Facility for Antiproton and Ion Research). This in-ring experiment will be performed with a circulating antiproton beam impinging on a fixed target. The beam is provided by the HESR (High Energy Storage Ring) and will allow studies of various kinds: Precision studies will unveil unprecedented details of hadronic matter, while low-bias data offers the opportunity for discoveries and room for the unknown. To harvest the rich scientific output of the PANDA experiment it is of utmost importance to pave the way for comprehensive theoretical preparations in many ways and a close contact to the experiment is mandatory. The link aspect between theorists and experimentalists is achieved via the PANDA Theory Advisory Group (TAG). But the challenging goals can only be achieved in an even broader world-wide networking activity. To initiate active networking in particular the possibility of an extended exchange with individual scientists provides a very productive atmosphere to develop new concepts and, apart from participation in conferences and workshops, stimulates the development of new theoretical approaches and to get things started, while details and more concrete applications will follow while back at the home institute and being supported by institutional and other third-party sources. 3

4 2 Institutions involved in the Exchange Program A large number of institutions and individual scientists are interested in the exchange program. The German institutions with which the presently identified participants are affiliated are: University of Bochum University of Bonn Technical University of Darmstadt Technical University of Dortmund GSI, Helmholtz Center for Heavy Ion Research, Darmstadt FZ Jülich, Research Center Jülich DESY, Germany Electronsyncrotron, Hamburg University of Heidelberg University of Mainz Ludwig Maximilian-University of Munich Technical University of Munich University of Regensburg University of Rostock University of Wuppertal The corresponding institutions of the U.S. collaborators are ANL, Argonne National Laboratory, Argonne, IL College of William & Mary Florida State University, Tallahassee, FL Indiana University, IN Iowa State University MIT, Massachusetts Institute of Technology, MT New Mexico State University, NM North Carolina State University, NC Ohio University, OH Old Dominion University, VA Pennsylvania State University, PA Carnegie Mellon University Pittsburgh, PA University of Pittsburgh, PA SLAC, Stanford Linear Accelerator Center, Menlo Park, CA Temple University TJNAF, Jefferson Lab University of Washington, Seattle, WA 4

5 3 Implementation 3.1 Guidelines and Organization Applications for travel through the GUSTEHP program will be judged on the basis of the following guidelines 1 : Professors and experienced postdocs are eligible for applications to GUSTEHP, but predominantly from German Universities. Only three trips per year from scientists of the Helmholtz Centers (DEY, FZJ, GSI). Applicants should explain in their proposals, which should be 1-2 pages long, the benefits of their proposed travel to the experimental research programs at Jefferson Lab or GSI-FAIR. The typical length of supported stay is expected to be about 2 weeks. However, applications for travel for longer periods will also be considered, but should not exceed 2 months. It is expected that applicants will spend approximately 50 % of their time at Jefferson Lab during their visits to the U.S. At the completion of travel supported by the GUSTHEP program, participants will be required to submit to the coordinating committee a brief (1-2 page) report summarizing the accomplishments during the travel. The program is not intended to support conference attendance, and therefore cannot pay for conference registration fees or support during conferences attended while on travel through the GUSTHEP program. Applications can be made at any time by contacting one of the investigators of the GUSTHEP proposal. The applications will be reviewed by the Coordinating Committee for compliance with these guidelines. 3.2 Coordinating Committee The Coordinating Committee (CC) will consist of representatives from Germany and the U.S. who will convene on a regular basis to evaluate and process applications in a timely manner. The CC will also review the success of the program on an annual basis and prioritize areas of research which need the greatest focus. The German representatives on the CC will be: K. Peters (GSI), H. Wittig (U Mainz), A. Schäfer (U Regensburg), and J.Wambach (TU Darmstadt). The U.S. members of the CC will be: W. Melnitchouk (Jefferson Lab), M.R. Pennington (Jefferson Lab) and A. Szczepaniak (Indiana U). 3.3 Proposed Budget The cost of travel to Jefferson Lab and local expenses are detailed here. The $ amounts are based on an exchange rate of 1 = $ 1.30, which was current at the time of submission of the application. Round-trip airline tickets from the U.S. to Frankfurt, Germany, and transportation between Frankfurt and Darmstadt: (assuming mostly summer travel). 1 The guidelines follow the rules laid out in the matching GAUSTEQ proposal. 5

6 Accommodation at the Jefferson Lab guest house: $ 56/night 2. Under exceptional circumstances, if accommodation at the Jefferson Lab guest house is not available, the traveler may apply for reimbursement at a higher rate. Per diem for this area in the U.S. is 35/day. Allowance is made for approximately 10 visits from Germany per year (by faculty, postdocs, as well as students) of 14 days duration, and 4 visits of 1 month (30 days) duration. Taking this into account, the requested funding is: Subsidy of the flight tickets and other transportation: up to per trip. Per diem (incl. accommodation) for shorter trips: 107 per day. Flat monthly charge: 2392 per month. This amounts to per year. The relative break up will be subject to community demand, and the allocations will be flexible enough so as to respond to the demand. A per diem will be reimbursed according to the length of the stay, but not exceeding the flat monthly charge. GSI will provide facilities to set up and maintain the web site for the GUSTHEP program, which will be linked to the GAUSTEQ web site in the U.S. The total requested amount for 3 years is (rounded to the nearest T ). 3.4 Corresponding Program GAUSTEQ A corresponding exchange program for the visit of U.S.-American theorists (in nuclear and hadron physics) has been approved and funded by the U.S. Department of Energy (DOE) and started in January 2012 under Contract No.DE-SC Details can be found at The amount of annual funding is similar to the funds requested in this proposal. 4 Summary and Outlook The proposed exchange program together with the GAUSTEQ initiative from the U.S. will provide an excellent opportunity to foster strong collaborations among theorists in hadron physics between U.S. and Germany. Theoretical hadron physics is the back bone for progress in the understanding of structure, existence and properties of the protons and particles alike. In the spirit of building FAIR, the largest facility world-wide for this community it is mandatory to shape our scientific landscape to take scientific leadership and to profit substantially from the large scale investments made by the Federal Republic of Germany. 2 For extended stay 7-29 days. 6