Resummation of threshold logarithms in deeply-virtual Compton scattering

I derive an all-order resummation formula for the logarithmically enhanced contributions proportional to $\frac{\alpha_s^n}{x \pm \xi} \log (\frac{\xi \pm x}{2\xi})^k$ in the coefficient function of deeply-virtual-Compton scattering and the pion-photon transition form factor in momentum space. The resummation is performed at the next-to-next-to-leading logarithmic accuracy. The key observation is that the non-singlet coefficient function itself factorizes in the $x \rightarrow \pm \xi$ limit, which allows for a resummation using renormalization group equations

Best Practices and Biblical Worldview for Technology Integration

This research focused on a study conducted across three different teacher education programs, focusing on equipping teacher candidates with strategies for technology integration while encouraging them to examine how to best glorify God with appropriate technology use in the classroom. Students were instructed using common research-based practices and assignments. These included instruction on the SAMR model, exploration of a variety of technology tools, and a reflection on what it means to glorify God through teaching with technology. Pre- and post-survey data was collected to measure the effectiveness of both the instruction and changes in students\u27 attitudes and perceptions of technology use in teaching. Pre-service teachers read and discussed research addressing Christian wisdom on technology, pursuing excellence in Christian education, technology and computational thinking in the classroom, and digital citizenship as they engaged in these assignments. This article includes main themes, preliminary findings, and implications for future research based on results across all three institutions

Deeply-virtual Compton scattering at the next-to-next-to-leading order

Deeply-virtual Compton scattering gives access to the generalized parton distributions that encode the information on the transverse position of quarks and gluons in the proton in dependence in their longitudinal momentum. In anticipation of the high-precision experimental data in a broad kinematic range from the Electron-Ion Collider, we have calculated the two-loop, next-to-next-to-leading (NNLO) DVCS coefficient functions associated with the dominant Compton form factors $\mathcal H$ and $\mathcal E$ at large energies. The NNLO correction to the imaginary part of $\mathcal H$ appears to be rather large, up to factor two at the input scale $Q^2=4$ GeV$^2$ for simple GPD models, due to a cancellation between quark and gluon contributions.Comment: 9 pages, 3 figure

Breakdown of collinear factorization in the exclusive photoproduction of a π0γ \pi ^{0}\gamma pair with large invariant mass

We study the exclusive photoproduction of a $\pi ^{0}\gamma$ pair with large invariant mass $M_{\gamma \pi}^2$, which is sensitive to the exchange of either two quarks or two gluons in the $t$-channel. In this letter, we show that the process involving two-gluon exchanges does not factorize in the Bjorken limit at the leading twist. This can be explicitly demonstrated by the fact that there exist diagrams, which contribute at the leading twist, for which Glauber gluons remain trapped, due to the pinching of the contour integrations of both the plus and minus component of the Glauber gluon momentum. For the same reason, $\pi^0$-nucleon scattering to two photons also suffers from the same issue. On the other hand, we stress that there are no issues with respect to collinear factorization for the quark channels. By considering an analysis of all potential reduced diagrams of leading pinch surfaces, we argue that the quark channel is safe from Glauber pinches, and therefore, a collinear factorization in that case follows through without any problems. This means that processes where gluon exchanges are forbidden, such as the exclusive photoproduction of $\pi ^{\pm}\gamma$ and $\rho^{0,\,\pm} \gamma$, are unaffected by the factorization breaking effects we point out in this letter.Comment: 11 pages, 4 figure

Cooking Turkey in Aluminum Foil

Roasting a good-sized turkey by the traditional method always has called for some expert maneuvering on the part of the homemaker. Does the [unknown] of aluminum foil make turkey roasting easier? Some Iowa State College food researchers discuss the advantages and disadvantages of this method

Using Interpretive Signs and Theory-based Messaging to Protect the Western Snowy Plover (Charadrius alexandrinus nivosus)

Although the human health and social benefits from outdoor recreation are numerous, there is mounting evidence that outdoor recreation can negatively impact wildlife. Shorebirds are known to be especially sensitive to recreation-related disturbance because they nest and forage directly on beaches that are often used for recreation. Many studies have documented negative effects of outdoor recreation on shorebirds, and some have specifically related to the federally threatened western snowy plover (WSPL) (Charadrius alexandrinus nivosus). The Oregon Dunes National Recreation Area (ODNRA) is a popular location for beach recreation that provides critical habitat for the WSPL. ODNRA managers struggle to keep visitors from recreating inside sensitive WSPL nesting and foraging habitat in dunes and open sand. Due to limited personnel, the ODNRA uses rope fencing and signs to communicate rules about WSPL nesting habitat. In an effort to improve compliance and influence attitudes, this study tested signs based on two communication theories: the Focus Theory of Normative Conduct (i.e., normative) and the Extended Elaboration Likelihood Model (i.e., narrative). This thesis contains one standalone article that examines how narrative and normative messaging: (a) relates to visitor attention to signs at the ODNRA, (b) impacts visitor attitudes related to the WSPL and their management at the ODNRA, and (c) impacts compliance with WSPL restrictions at the ODNRA. In the summer of 2018, direct observation and questionnaires were used at a popular ODNRA beach to compare the normative and narrative signs against an existing interpretive sign on the following variables: attention capture and holding, impact on attitudes about the WSPL, and impact on beach use. A total of 440 completed questionnaires were collected with a response rate of 74%. Results showed that visitors were more likely to read the treatment signs than the existing interpretive sign, although many visitors ignored the signs altogether. The narrative sign was the most effective in encouraging visitors to stay out of WSPL nesting habitat. However, the impact of the treatment signs on attitudes was minimal compared to the existing interpretive sign. This thesis suggests changes in the design of interpretive signs at the ODNRA and recommends using a narrative format to encourage visitors to perform wildlife friendly behaviors. However, because many visitors still recreated inside WSPL nesting habitat after being exposed to signs, these signs should not be used as a primary management tool at the ODNRA. Rather, signs should be used to supplement strategies such as fencing or personal contact

Borderline Personality Disorder and Self-conscious Emotions in Response to Adult Unwanted Sexual Experiences

Borderline personality disorder (BPD) is associated with a proneness to unpleasant self-conscious emotions (SCE). Given that BPD is also associated with heightened rates of SCE-eliciting events (including unwanted sexual experiences), research examining the factors influencing SCE in response to these events is needed. This study examined associations between BPD pathology and SCE in response to adult unwanted sexual experiences among 303 community women. Extent of sharing about and perceived personal responsibility for the event were examined as moderators of the association between BPD and current event-related SCE. Both self-reported BPD symptom severity in the full sample and interview-based measures of BPD symptom count and diagnosis in a subsample (n=75) were associated with greater SCE at the event and currently. Moreover, in the subsample, both BPD symptom count and diagnosis were associated with heightened current SCE only when (1) extent of sharing was low, or (2) perceived personal responsibility was high