3-Loop Heavy Flavor Corrections in Deep-Inelastic Scattering with Two Heavy Quark Lines

We consider gluonic contributions to the heavy flavor Wilson coefficients at 3-loop order in QCD with two heavy quark lines in the asymptotic region $Q^2 \gg m_{1(2)}^2$. Here we report on the complete result in the case of two equal masses $m_1 = m_2$ for the massive operator matrix element $A_{gg,Q}^{(3)}$, which contributes to the corresponding heavy flavor transition matrix element in the variable flavor number scheme. Nested finite binomial sums and iterated integrals over square-root valued alphabets emerge in the result for this quantity in $N$ and $x$-space, respectively. We also present results for the case of two unequal masses for the flavor non-singlet OMEs and on the scalar integrals ic case of $A_{gg,Q}^{(3)}$, which were calculated without a further approximation. The graphs can be expressed by finite nested binomial sums over generalized harmonic sums, the alphabet of which contains rational letters in the ratio $\eta = m_1^2/m_2^2$.Comment: 10 pages LATEX, 1 Figure, Proceedings of Loops and Legs in Quantum Field Theory, Weimar April 201

The 3-Loop Non-Singlet Heavy Flavor Contributions and Anomalous Dimensions for the Structure Function F2(x,Q2)F_2(x,Q^2) and Transversity

We calculate the massive flavor non-singlet Wilson coefficient for the heavy flavor contributions to the structure function $F_2(x,Q^2)$ in the asymptotic region $Q^2 \gg m^2$ and the associated operator matrix element $A_{qq,Q}^{(3), \rm NS}(N)$ to 3-loop order in Quantum Chromodynamics at general values of the Mellin variable $N$. This matrix element is associated to the vector current and axial vector current for the even and the odd moments $N$, respectively. We also calculate the corresponding operator matrix elements for transversity, compute the contributions to the 3-loop anomalous dimensions to $O(N_F)$ and compare to results in the literature. The 3-loop matching of the flavor non-singlet distribution in the variable flavor number scheme is derived. All results can be expressed in terms of nested harmonic sums in $N$ space and harmonic polylogarithms in $x$-space. Numerical results are presented for the non-singlet charm quark contribution to $F_2(x,Q^2)$.Comment: 82 pages, 3 style files, 33 Figure

New Results on Massive 3-Loop Wilson Coefficients in Deep-Inelastic Scattering

We present recent results on newly calculated 2- and 3-loop contributions to the heavy quark parts of the structure functions in deep-inelastic scattering due to charm and bottom.Comment: Contribution to the Proc. of Loops and Legs 2016, PoS, in prin

3-loop heavy flavor Wilson coefficients in deep-inelastic scattering

We present our most recent results on the calculation of the heavy flavor contributions to deep-inelastic scattering at 3-loop order in the large $Q^2$ limit, where the heavy flavor Wilson coefficients are known to factorize into light flavor Wilson coefficients and massive operator matrix elements. We describe the different techniques employed for the calculation and show the results in the case of the heavy flavor non-singlet and pure singlet contributions to the structure function $F_2(x,Q^2)$.Comment: 4 pages Latex, 2 style files, 4 Figures, Contribution to the Proceedings of QCD '14, Montpellier, Jult 201

Patient choice at the point of GP referral: Department of Health

1 The Department of Health has a Public Service Agreement target to ensure that by the end of 2005 every hospital appointment in the National Health Service in England (the NHS) will be booked for the convenience of the patient, making it easier for patients and their General Practitioners (GPs) to choose the hospital and consultant that best meets their need. The Department aims to provide patients with the opportunity to choose between four to five healthcare providers for elective hospital treatment by December 2005. In consultation with their GP, patients should be able to choose, from a menu of NHS and independent sector healthcare providers, their preferred location for treatment. Patients should also be able to book the time and date of their initial outpatient appointment within 24 hours of the decision to refer the patient for treatment. This target will apply to around 9.4 million patients referred for hospital treatment by their GP each year, around four per cent of the total estimated 241 million GP consultations. 2 Choice at referral can contribute to a more patientfocused health service, bringing benefits to both patients and the NHS. But providing such a choice will not happen by accident. There are a number of dependencies and interactions with other policies that need to be managed. Information Technology (IT) systems need to be developed and modified and significant cultural, organisational and behavioural changes will need to be made by patients, NHS organisations and staff. 3 This report examines whether the Department is on track to deliver choice at the point of referral successfully by the target date of December 2005. Our work has found that: a Progress has been made towards delivering choice at referral through establishing the required organisational infrastructure, commissioning new IT systems and modifications to existing ones, and providing support for the NHS organisations that will deliver it. b The engagement of GPs is currently low and is a key risk which the Department must address to deliver choice successfully. The Department plans to address this risk through a campaign to inform and engage GPs during 2005 and it will need to monitor carefully the progress of this campaign. c Choice at referral will be delivered most efficiently and effectively through electronic booking (e-booking, also known as Choose and Book), in which the Electronic Booking Service, commissioned by the Department’s National Programme for IT (NPfIT), is linked to upgraded or new computer systems in hospitals and GPs’ surgeries. However, e-booking will not be universally available by December 2005. Until e-booking is fully adopted choice will have to be provided in other, less efficient, ways. d Parts of the NHS still have much to do if they are to deliver choice. A significant minority of Primary Care Trusts do not yet have adequate plans in place to manage the introduction of choice and some may struggle to manage the required new commissioning arrangements. 4 Our more detailed findings are as follows. Progress has been made towards delivering choice at referral 5 The Department believes that choice is affordable. Additional annual infrastructure and transaction costs are estimated to be £122 million – or 1.4 per cent of the current total expenditure on elective care. The main aim of introducing choice is to improve services for patients, but it should lead to increased efficiencies in primary and secondary care services worth an estimated £71 million, off-setting some of these costs. 6 It is essential that choice is supported by other elements of system reform including e-booking, payment by results, commissioning and appropriate capacity. Modelling exercises have shown that the system reforms should work in harmony with one another. Payment by results should enable the transfer of funding to follow the patient and there should be sufficient capacity across the system to enable choice to be effective. 7 Much of the organisational infrastructure that is required for choice is in place and there is clear accountability for the delivery of the programme. To strengthen detailed national programme management arrangements the Department created, on 22 December 2004, a new post of National Implementation Director for Choose and Book, with effect from 10 January 2005. The new Director will be responsible for overseeing the implementation of choice within the NHS whilst the National Programme for IT Group Programme Director for Choose and Book will continue to be responsible for Choose and Book technology development and deployment, patient access and Choose and Book contract management. 8 The Department has provided different types of support to the NHS – for example, ten pilot schemes have been run to test the policy in practice. It has set up a system for periodically measuring progress and used this to establish the position at the end of October 2004, creating a baseline against which to monitor future progress. 9 Research has identified what information patients will want to base their choices on, and the Department is seeking to provide this. While it is unlikely that full information will be available for December 2005, the majority of those aspects identified by patients as being the most important, such as waiting times and basic access information, will be in place. The Department plans to increase the information available over time. The key risk to the delivery of choice is the engagement of GPs 10 Choice cannot be delivered without support from GPs but our survey of GPs found that around half of GPs know very little about it and 61 per cent feel either very negative or a little negative. GPs’ concerns include practice capacity, workload, consultation length and fears that existing health inequalities will be exacerbated. The Department has deliberately held back its main effort to inform and engage GPs about choice until it has had a working e-booking system to show GPs, but it intends to mount a campaign to inform and engage GPs during 2005. Until e-booking is fully adopted choice will be supported by other mechanisms 11 The Department has commissioned Atos Origin to develop a national system for e-booking, which will be linked to upgraded or new Patient Administration Systems in hospitals and IT systems in GPs’ surgeries to provide an overall service known as e-booking. The National Programme for IT has planned the roll out of e-booking on an incremental basis to minimise risk, and to link it by the end of 2005 to some 60 to 70 per cent of hospital systems and GP practices. 12 E-booking is the most effective and efficient way of delivering the Department’s plans for choice, and alternative booking mechanisms offer poorer value for money. Atos Origin has delivered a functioning system and the first booking using e-booking was made in July 2004. However the roll-out of e-booking has been slower than planned and at the end of December 2004 only 63 bookings had been made. Problems have included the reluctance of users to work with an unreliable end-to-end system, limited progress in linking to GP and hospital systems, and the limited number of GPs willing to use the system. 13 The Department believes that new releases of software have addressed the reliability of the whole end-to-end system and that having a fully operational system will encourage GPs to engage with e-booking. The roll-out of changes to hospital systems to allow them to link to e-booking is gathering pace and four types of GP systems can now link to e-booking, although the largest supplier has not yet agreed an implementation plan. A combined team of Departmental and NHS personnel are working with the three main existing GP system suppliers to agree a national deployment schedule. This work should be completed by February 2005, along with a nationally negotiated commercial arrangement. The Department is also developing and trialling contingency plans against further delays, as well as alternatives to the fully integrated Choose and Book solution. Parts of the NHS still have much to do 14 Programme management arrangements in the NHS are incomplete. While most Primary Care Trusts expect to be able to deliver the choice target, there is variability in their overall performance. As many as a quarter of Primary Care Trusts currently forecast that they will not deliver the choice targets. In addition, some Primary Care Trusts may struggle to manage the new commissioning arrangements and two-thirds have yet to commission the required number of providers. The department is developing a framework of support to assist trusts to overcome these obstacles. 15 The Department needs urgently to address the low level of GP support for their plans for implementing choice at referral, and should: I Press on urgently with its plans for informing GPs about the implementation of choice at referral and its impact on GPs and patients. II Monitor the views of GPs, for example by a regular survey, repeating key questions from our own survey, to assess the rate of progress being achieved towards the level of support needed to meet its target of full implementation by December 2005. III Consider whether further action is needed to secure the required level of GP support, once GPs are fully informed on what choice at referral involves. 16 The Department should also: IV Complete its planned benefits realisation plan for choice at referral by the summer of 2005, along with a monitoring mechanism and quantified targets. V Keep under regular and close review the progress of its planned implementation of choice through implementing e-booking and consider the scope for accelerating the roll-out of e-booking to make it available everywhere by December 2005. VI If it becomes clear that it is not possible to deliver e-booking everywhere by December 2005, the Department should: a monitor closely the development of the interim solutions to ensure that they meet their delivery dates; and b ensure that the implementation of interim solutions does not detract from the priority of bringing in fully integrated e-booking systems as soon as possible. VII Establish an evaluation framework for Primary Care Trust commissioning to assist Strategic Health Authorities in assessing the capacity and skills of Primary Care Trusts in this area and securing improvements in capacity and skills where necessary

3-Loop Corrections to the Heavy Flavor Wilson Coefficients in Deep-Inelastic Scattering

A survey is given on the status of 3-loop heavy flavor corrections to deep-inelastic structure functions at large enough virtualities $Q^2$.Comment: 13 pages Latex, 8 Figures, Contribution to the Proceedings of EPS 2015 Wie

Recent progress on the calculation of three-loop heavy flavor Wilson coefficients in deep-inelastic scattering

We report on our latest results in the calculation of the three-loop heavy flavor contributions to the Wilson coefficients in deep-inelastic scattering in the asymptotic region $Q^2 \gg m^2$. We discuss the different methods used to compute the required operator matrix elements and the corresponding Feynman integrals. These methods very recently allowed us to obtain a series of new operator matrix elements and Wilson coefficients like the flavor non-singlet and pure singlet Wilson coefficients.Comment: 11 pages Latex, 2 Figures, Proc. of Loops and Legs in Quantum Field Theory, April 2014, Weimar, German

Variations of Heavy Ion Abundances Relative to Proton Abundances in Large Solar Energetic (E \u3e 10 MeV) Particle Events

The elemental composition of heavy ions (with atomic number Z \u3e 2) (hi-Z) in large gradual E \u3e 10 MeV nuc-1 SEP events has been extensively studied in the 2-15 MeV nuc-1 range to determine the acceleration processes and transport properties of SEPs. These studies invariably are based on abundances relative to those of a single element such as C or O and often neglect H and He, the elements of primary interest for space weather. The total radiation of an SEP event is determined not only by the H and He properties but also by those of hi-Z ions whose abundances and variations relative to H from one event to another are unknown. We report a study to determine those variations in a group of 15 large SEP events over the period 2000 to 2015. Five hi-Z ions (He, C, O, Mg, & Fe) were selected to determine variations of their fluences relative to those of H in the 13.5-50.7 MeV nuc-1 energy range for each SEP event. Our average hi-Z abundance ratios slightly exceed those reported by [1] at lower energies, with the Fe event abundances showing the largest standard deviation of an order of magnitude. The event abundances were weakly correlated with H fluences and strongly correlated with speeds Vcme of associated coronal mass ejections (CMEs). These correlations may be evidence of streaming limits in the shock regions of H in the largest events

Electroluminescence from single nanowires by tunnel injection: an experimental study

We present a hybrid light-emitting diode structure composed of an n-type gallium nitride nanowire on a p-type silicon substrate in which current is injected along the length of the nanowire. The device emits ultraviolet light under both bias polarities. Tunnel-injection of holes from the p-type substrate (under forward bias) and from the metal (under reverse bias) through thin native oxide barriers consistently explains the observed electroluminescence behaviour. This work shows that the standard p-n junction model is generally not applicable to this kind of device structure.Comment: 6 pages, 6 figure

Measuring the activity of European and African Countries using Social Accounting Matrices

Economic models at the micro, meso and macro levels presuppose the existence of consistent databases that make it possible to quantify the activity of enterprises, sectors, regions, countries or continents. Such models can also be important aids in the policy decision process, since they permit the construction of scenarios resulting from the adoption of policy measures and the consequent changes that they introduce. When consistent with the United Nations System of National Accounts (SNA), the Social Accounting Matrix (SAM) can include all the nominal flows of the measured part of the economy, at the level of both production and the institutions, and therefore satisfies these requirements. Thus, in its numerical version, a SAM constitutes a database and provides a snapshot of the measured reality at a certain moment, whereas its possible algebraic versions, i.e. models that are based upon it, permit the construction of the above-mentioned scenarios. The possibility and usefulness of constructing SAMs for African countries consistent with the SNA will be examined and experimented. The SAM’s basic structure and consistency within the whole system will be studied, as well as any possible disaggregations, extensions, aggregates, indicators and balances that can be calculated. Other aspects beyond that basic structure will also be examined in order to show to what extent the SAM is capable of covering parts of the economy that are not covered by the SNA.info:eu-repo/semantics/publishedVersio