New meson spectroscopy with open charm and beauty

Colangelo, P.; Fazio, F. De; Giannuzzi, Floriana; Nicotri, S.

doi:10.1103/physrevd.86.054024

Cited by 190 publications

(264 citation statements)

References 63 publications

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“…The measured mass differences are more precise than the previous best measurements of a factor of 2 at least. The measured BðB Ã s2 !B Ãþ K À Þ BðB Ã s2 !B þ K À Þ branching fraction ratio and B Ã s2 width are in good agreement with theoretical predictions [12][13][14].…”

Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 75%

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First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
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The properties of the orbitally excited (L ¼ 1) B 0 s states are studied by using 1:0 fb À1 of pp collisions at ffiffi ffi s p ¼ 7 TeV collected with the LHCb detector. The first observation of the B Ã s2 ð5840Þ 0 meson decaying to B Ãþ K À is reported, and the corresponding branching fraction measured relative to the B þ K À decay mode. The B s1 ð5830Þ 0 ! B Ãþ K À decay is observed as well. The width of the B Ã s2 ð5840Þ 0 state is measured for the first time, and the masses of the two states are determined with the highest precision to date. The observation of the B Ã s2 ð5840Þ 0 ! B Ãþ K À decay favors the spin-parity assignment J P ¼ 2 þ for the B Ã s2 ð5840Þ 0 meson. In addition, the most precise measurement of the mass difference mðB Ãþ Þ À mðB þ Þ ¼ 45:01 AE 0:30ðstatÞ AE 0:23ðsystÞ MeV=c 2 is obtained. DOI: 10.1103/PhysRevLett.110.151803 PACS numbers: 13.25.Hw, 12.39.Hg, 14.40.Nd Heavy quark effective theory describes mesons with one heavy and one light quark where the heavy quark is assumed to have infinite mass [1]. It is an important tool for calculating meson properties which may be modified by physics beyond the standard model, such as CP violation in charm meson decays [2] or the mixing and lifetimes of B mesons [3]. It also predicts the properties of excited B and B 0 s mesons [4][5][6][7], and precise measurements of these properties are a sensitive test of the validity of the theory. Within heavy quark effective theory the B 0 s mesons are characterized by three quantum numbers: the relative orbital angular momentum L of the two quarks, the total angular momentum of the light quark j q ¼ jL AE 1 2 j, and the total angular momentum of the B 0 s meson J ¼ jj q AE 1 2 j. For L ¼ 1 there are four different possible (J, j q ) combinations, all with even parity. These are collectively termed the orbitally excited states. Such states can decay to B þ K À and/or B Ãþ K À (the inclusion of charge-conjugate states is implied throughout this Letter), depending on their quantum numbers and mass values. The two states with j q ¼ 1=2, named B Ã s0 and B 0 s1 , are expected to decay through an S-wave transition and to have a large Oð100 MeV=c 2 Þ decay width. In contrast, the two states with j q ¼ 3=2, named B s1 ð5830Þ 0 and B Ã s2 ð5840Þ 0 (henceforth B s1 and B Ã s2 for brevity), are expected to decay through a D-wave transition and to have a narrow Oð1 MeV=c 2 Þ decay width. Table I gives an overview of these states.In this Letter, a 1:0 fb À1 sample of data collected by the LHCb detector is used to search for the orbitally excited B 0 s mesons in the mass distribution of B þ K À pairs, where the B þ mesons are selected in the four decay modes:Two narrow peaks were observed in the B þ K À mass distribution by the CDF Collaboration [9]. Putatively, they are identified with the states of the j q ¼ 3=2 doublet expected in heavy quark effective theory [4] and are named B s1 and B Ã s2 . As the B s1 ! B þ K À decay is forbidden, one of the mass peaks observed is interpreted as the B s1 ! B Ãþ K À decay fol...

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Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 75%

“…B Ãþ K À decay has not yet been observed but could manifest itself in the B þ K À mass spectrum in a similar fashion to the corresponding B s1 meson decay. The be between 2% and 10%, depending on the B Ã s2 mass [11][12][13][14].…”

mentioning

confidence: 99%

First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
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“…In both cases the contributions are negligible compared with the dominant pole contribution of the B meson. We also investigated the contribution of a possible excited B state such as the B 1 (5721) predicted in [52] from heavy quark effective theories. The contribution of such a resonance will increase f B by 4 − 5 MeV, which must be considered as part of the systematic error.…”

Section: Resultsmentioning

confidence: 99%

B meson decay constants f B c $$ {f}_{B_c} $$ , f B s $$ {f}_{B_s} $$ and f B from QCD sum rules

Baker

Bordes

Domínguez

et al. 2014

J. High Energ. Phys.

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Finite energy QCD sum rules with Legendre polynomial integration kernels are used to determine the heavy meson decay constant f Bc , and revisit f B and f Bs . Results exhibit excellent stability in a wide range of values of the integration radius in the complex squared energy plane, and of the order of the Legendre polynomial. Results are f Bc = 528 ± 19 MeV, f B = 186 ± 14 MeV, and f Bs = 222 ± 12 MeV.

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“…To quantitatively assess the accuracy of the quark model predictions, assumptions are needed to formulate a wave equation for quark-antiquark bound states starting from the QCD Lagrangian [5]. Nevertheless, the discrepancy between the predictions of various models and the mass measurements [6][7][8][9] suggests that some observed states in the cs case are not simple quark-antiquark configurations. Possible interpretations include more complex structures, such as bound states ("molecules") of other mesons [10], or mixtures of conventional quark-antiquark with four-quark components [11].…”

Section: Introductionmentioning

confidence: 99%

Study of D J meson decays to D +π−, D 0π+ and D ∗+π− final states in pp collisions

Aaij¹,

Adeva²,

Adinolfi³

et al. 2013

J. High Energ. Phys.

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New meson spectroscopy with open charm and beauty

Cited by 190 publications

References 63 publications

First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
View full text Add to dashboard Cite

First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
View full text Add to dashboard Cite

B meson decay constants f B c $$ {f}_{B_c} $$ , f B s $$ {f}_{B_s} $$ and f B from QCD sum rules

Study of D J meson decays to D +π−, D 0π+ and D ∗+π− final states in pp collisions

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New meson spectroscopy with open charm and beauty

Cited by 190 publications

References 63 publications

First Observation of the DecayBs2*(5840)0→B*+Aaij1, Beteta2, Adametz3 et al. 2013Phys. Rev. Lett.619280View full textAdd to dashboardCite

First Observation of the DecayBs2*(5840)0→B*+Aaij1, Beteta2, Adametz3 et al. 2013Phys. Rev. Lett.619280View full textAdd to dashboardCite

B meson decay constants f B c $$ {f}_{B_c} $$ , f B s $$ {f}_{B_s} $$ and f B from QCD sum rules

Study of D J meson decays to D +π−, D 0π+ and D ∗+π− final states in pp collisions

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First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
View full text Add to dashboard Cite

First Observation of the DecayBs2(5840)0→B+
Aaij¹,
Beteta²,
Adametz³
et al. 2013
Phys. Rev. Lett.
61
9
28
0
View full text Add to dashboard Cite