Recent Beijing Spectroscopy (BES) results

Abstract

Recent experimental results from Beijing Spectroscopy (BES) are reviewed, including the hadron spectroscopy from J/\ decays, and a number of new states are found or confirmed, including V, N, X(1835), ZM threshold enhancement in J/\oJZM , a broad resonance in J/\oK K S 0 , decay studies of \ (2S) and F CJ , as well as the results of \ (3770) nondecays. The current status of BEPCII/BESIII, the major upgrade of BEPC/BESII, is also reported. Beijing Spectroscopy, hadron spectroscopy, charm physics, BEPCII The results in this paper are based on the data collected at Beijing Electron-Positron Collider. Beijing Spectroscopy (BES) was upgraded to BESII in 1997, and had been taking data till the end of April in 2004, with a data sample including 58 M J/\ events, 14 M \ (2S) events and data around \ (3770) with a luminosity of about 27 pb 1 . Many results have been obtained from those data, and about 80 papers have been published on the famous international journals, such as Phys Rev Lett, Phys Lett B and Phys Rev D, in which more than 10 papers were published on Phys Rev Lett. This article is divided into several sub-sessions about the results from J/\, \ (2S) and \(3770),There has been evidence for a low mass pole in the early DM2 [1] and BESI [2] data on J/\ to ZS S . A huge event concentration in the I = 0 S-wave S S channel was seen in the region of m S S around 500 600 MeV in a pp central production experiment [3] . This peak is too large to be explained as a background [4] . There have been many studies on the possible resonance structure in SS elastic scattering [5] . It was later proved that the V(sigma) resonance is unavoidable in the chiral perturbation theory in order to explain the S S scattering phase shift data [6] . E791 experiment

Moderate Genetic Diversity and Genetic Differentiation in the Relict Tree Liquidambar formosana Hance Revealed by Genic Simple Sequence Repeat Markers

“…Moreover, a similar phenomenon was also observed in cpDNA markers in previous studies of Chinese sweetgum (Wu, 2009 ). These may be attributed to historical evolution events and severe climatic changes, particularly Quaternary repetitive glaciations (Li, 1975 ). The genetic diversity of sweetgum populations would have been erased by repetitive glacial contraction and expansion, and the founder effect of the population would lead to a reduction in genetic diversity.…”

Processing of lignin in urea–zinc chloride deep-eutectic solvent and its use as a filler in a phenol-formaldehyde resin

“…Four types of carbon bonds (denoted C 1 to C 4 ) in lignin and relignin were identied by XPS: 35 C 1 ¼ carbon atoms bonded to other carbon atom or hydrogen atoms (C-C; C-H). …”

Cloning and Characterization of a Flavonol Synthase Gene From Litchi chinensis and Its Variation Among Litchi Cultivars With Different Fruit Maturation Periods

“…In litchi, the major distinguishing characteristic among the EEM, EM, and MLM cultivars is their fruit maturation period. EEM cultivars generally have earlier flowering dates and a shorter fruit development process ( Li, 2008 ). Flavonols are known to be key regulators of auxin transport ( Jacobs and Rubery, 1988 ; Buer et al, 2013 ; Yin et al, 2014 ), and auxin has been shown to have an important role in determining flowering time ( Mahajan et al, 2011 ) and in the fruit development process ( Mounet et al, 2012 ; Dare et al, 2013 ; El-Sharkawy et al, 2014 ).…”

“…However, most litchi cultivars ripen between mid-June and mid-July. This results in a short and centralized fruit maturation period, which represents a bottleneck for litchi production in China ( Li, 2008 ). Therefore, development of novel litchi cultivars with extremely early fruit maturation periods is critical for the industry.…”