Natural and Mathematical Sciences

Permanent URI for this collectionhttps://hdl.handle.net/10679/313

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    Conference ObjectPublicationOpen Access
    Analysis of X(4140) like states and their radial excitations in QCD
    (Sissa Medialab Srl, 2017) Türkan, Arzu; Dağ, Hüseyin; Natural and Mathematical Sciences; TÜRKAN, Arzu; DAĞ, Hüseyin
    In this work, we investigated the X(4140) and like states and their radial excitations by using molecular and diquark-antidiquark currents which couple to scalar, axial vector and tensor states via QCD sum rules. In operator product expansion, we considered quark, gluon and mixed vacuum condansates up to dimension eight. For the ground states coupling to these currents, we found that masses are almost degenerate with X(4140). For the excited states, we found that scalar and tensor currents are coupling to D∗ sD∗ s threshold. However for the axial vector currents, the mass of the first excited state is compatible with X(4274). Thus we conclude that, X(4274) might be the first radial excitation of X(4140).
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    EditorialPublicationOpen Access
    Moving from symptom management to upstream plastics prevention: The fallacy of plastic cleanup technology
    (Elsevier, 2023-11-17) Bergmann, M.; Arp, H. P. H.; Carney Almroth, B.; Cowger, W.; Eriksen, M.; Dey, T.; Gündoğdu, S.; Helm, R. R.; Krieger, A.; Syberg, K.; Tekman, Mine Banu; Thompson, R. C.; Villarrubia-Gómez, P.; Warrier, A. K.; Farrelly, T.; Natural and Mathematical Sciences; TEKMAN, Mine Banu
    Plastic removal technologies can temporarily mitigate plastic accumulation at local scales, but evidence-based criteria are needed in policies to ensure that they are feasible and that ecological benefits outweigh the costs. To reduce plastic pollution efficiently and economically, policy should prioritize regulating and reducing upstream production rather than downstream pollution cleanup.