First measurement of the differential branching fraction and CP asymmetry of the B± → π±μ+μ− decay

• Published in: The journal of high energy physics Vol. 2015; no. 10
• Main Authors: Ajaltouni, Z., Albrecht, J., Alves, A. A., Badalov, A., Bellee, V., Ben-Haim, E., Bernet, R., Bien, A., Blouw, J., Brodzicka, J., Campana, P., Cauet, Ch, Chen, S., Ciezarek, G., Coco, V., Cojocariu, L., Cook, A., David, P. N. Y., Dordei, F., Dorigo, M., Dujany, G., Durante, P., Eidelman, S., Eklund, L., El Rifai, I., Esen, S., Evans, H. M., Falabella, A., Ferguson, D., Frei, C., Frosini, M., Gambetta, S., Garra Tico, J., Gersabeck, M., Grecu, A., Haines, S. C., Head, T., Hennessy, K., Hynds, D., Jing, F., Johnson, D., Jost, B., Jurik, N., Karbach, T. M., Kecke, M., Kenyon, I. R., Khurewathanakul, C., Kreplin, K., Kruse, F., Kucharczyk, M., Langhans, B., Lees, J.-P., Lindner, R., Loh, D., Lucchesi, D., Malde, S., Manca, G., Maratas, J., Milanes, D. A., Mordà, A., Morello, M. J., Muheim, F., Naik, P., Papanestis, A., Pepe Altarelli, M., Perazzini, S., Pinci, D., Rama, M., Redi, F., Rotondo, M., Sail, P., Saitta, B., Santacesaria, R., Saunders, D. M., Schmelling, M., Schubiger, M., Sciascia, B., Serrano, J., Shevchenko, V., Sridharan, S., Stahl, S., Stefkova, S., Stevenson, S., Szczekowski, M., Tellarini, G., Teubert, F., Tisserand, V., Tonelli, D., Tourneur, S., Tuning, N., Valenti, G., Veltri, M., Veneziano, G., Vesterinen, M., Voß, C., Wallace, R., Weiden, A., Wishahi, J., Wyllie, K., Zucchelli, S.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 06-10-2015; Springer Verlag (Germany)
• Subjects: Classical and Quantum Gravitation; Elementary Particles; High Energy Physics - Experiment; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Experimental Physics; Relativity Theory; String Theory; Hadron-Hadron Scattering; B physics; CP violation; Branching fraction; Rare decay
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP10(2015)034

A
bstract
The differential branching fraction with respect to the dimuon invariant mass squared, and the
CP
asymmetry of the
B
±
→
π
±
μ
+
μ
−
decay are measured for the first time. The CKM matrix elements |
V
td
| and |
V
ts
|, and the ratio |
V
td
/V
ts
| are determined. The analysis is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb
−1
, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The total branching fraction and
CP
asymmetry of
B
±
→
π
±
μ
+
μ
−
decays are measured to be
ℬ
B
±
→
π
±
μ
+
μ
−
=
1.83
±
0.24
±
0.05
×
10
−
8
and
A
C
P
B
±
→
π
±
μ
+
μ
−
=
−
0.11
±
0.12
±
0.01
,
where the first uncertainties are statistical and the second are systematic. These are the most precise measurements of these observables to date, and they are compatible with the predictions of the Standard Model.