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1. Amplitude analysis of the D+ → π−π+π+ decay and measurement of the π−π+ S-wave amplitude

   https://doi.org/10.1007/JHEP06(2023)044  

   Aaij, R.; Abdelmotteleb, A. S.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; et al (June 2023, Journal of High Energy Physics)

   A bstract An amplitude analysis of the D + → π − π + π + decay is performed with a sample corresponding to 1.5 fb − 1 of integrated luminosity of pp collisions at a centre-of-mass energy $$ \sqrt{s} $$ s = 8 TeV collected by the LHCb detector in 2012. The sample contains approximately six hundred thousand candidates with a signal purity of 95%. The resonant structure is studied through a fit to the Dalitz plot where the π − π + S-wave amplitude is extracted as a function of π − π + mass, and spin-1 and spin-2 resonances are included coherently through an isobar model. The S-wave component is found to be dominant, followed by the ρ (770) 0 π + and f 2 (1270) π + components. A small contribution from the ω (782) → π − π + decay is seen for the first time in the D + → π − π + π + decay. 

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2. Tipping the Balance between S-π and O-π Interactions

   https://doi.org/10.1021/jacs.8b07617  

   Hwang, Jungwun; Li, Ping; Smith, Mark D.; Warden, Constance E.; Sirianni, Dominic A.; Vik, Erik C.; Maier, Josef M.; Yehl, Christopher J.; Sherrill, C. David; Shimizu, Ken D. (September 2018, Journal of the American Chemical Society)
3. Origin of the π–π Spacing Change upon Doping of Semiconducting Polymers

   https://doi.org/10.1021/acs.jpcc.8b10845  

   Liu, Wenlan; Müller, Lars; Ma, Shuangying; Barlow, Stephen; Marder, Seth R.; Kowalsky, Wolfgang; Köhn, Andreas; Lovrincic, Robert (November 2018, The Journal of Physical Chemistry C)
4. Anion‐π Interactions: What's in the Name?

   https://doi.org/10.1002/cplu.202300350  

   Rosokha, Sergiy_V (August 2023, ChemPlusChem)

   Abstract The studies of the anion‐π interactions advanced during the last two decades from the discussion of the mere existence of this counter‐intuitive bonding to its utilization for anion recognition and transport, catalysis, and other applications. Yet, there are substantial differences in the interpretation of nature and the driving forces of anion‐π bonding. Most surprisingly, there are still different opinions about the meaning of this term (i. e., which associations can be considered anion‐π complexes). After a brief overview of the studies in this area (including early examples of such complexes), we suggested that anion‐π bonding occurs when there is evidence of a net attraction between a (close‐shell) anion and the face of an electrophilic π‐system. This definition encompasses fundamentally similar supramolecular complexes comprising diverse π‐systems and anions and its general acceptance would facilitate a discussion of the nature and distinct driving forces of this fascinating interaction. 

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5. The time-dependent CP asymmetry in B0 → Kresγ → π+π−Ks0γ$$ {K}_s^0\gamma $$ decays

   https://doi.org/10.1007/JHEP09(2019)034  

   Akar, S.; Ben-Haim, E.; Hebinger, J.; Kou, E.; Yu, F.-S. (September 2019, Journal of High Energy Physics)